Index: head/lib/libc/gen/gen-private.h =================================================================== --- head/lib/libc/gen/gen-private.h (revision 349553) +++ head/lib/libc/gen/gen-private.h (revision 349554) @@ -1,64 +1,68 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _GEN_PRIVATE_H_ #define _GEN_PRIVATE_H_ struct _telldir; /* see telldir.h */ struct pthread_mutex; /* * Structure describing an open directory. * * NOTE. Change structure layout with care, at least dd_fd field has to * remain unchanged to guarantee backward compatibility. */ struct _dirdesc { int dd_fd; /* file descriptor associated with directory */ long dd_loc; /* offset in current buffer */ long dd_size; /* amount of data returned by getdirentries */ char *dd_buf; /* data buffer */ int dd_len; /* size of data buffer */ off_t dd_seek; /* magic cookie returned by getdirentries */ int dd_flags; /* flags for readdir */ +#ifndef IN_RTLD struct pthread_mutex *dd_lock; /* lock */ +#else + struct _donotuse *dd_lock; /* unused in rtld, keep same layout */ +#endif struct _telldir *dd_td; /* telldir position recording */ void *dd_compat_de; /* compat dirent */ }; #define _dirfd(dirp) ((dirp)->dd_fd) struct dirent; int __readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result); #endif /* !_GEN_PRIVATE_H_ */ Index: head/libexec/rtld-elf/Makefile =================================================================== --- head/libexec/rtld-elf/Makefile (revision 349553) +++ head/libexec/rtld-elf/Makefile (revision 349554) @@ -1,118 +1,119 @@ # $FreeBSD$ # Use the following command to build local debug version of dynamic # linker: # make DEBUG_FLAGS=-g WITHOUT_TESTS=yes all .include PACKAGE= clibs MK_PIE= no # Always position independent using local rules MK_SSP= no CONFS= libmap.conf PROG?= ld-elf.so.1 .if (${PROG:M*ld-elf32*} != "") TAGS+= lib32 .endif SRCS= \ rtld_start.S \ reloc.c \ rtld.c \ rtld_lock.c \ rtld_malloc.c \ rtld_printf.c \ map_object.c \ xmalloc.c \ debug.c \ libmap.c MAN= rtld.1 CSTD?= gnu99 CFLAGS+= -Wall -DFREEBSD_ELF -DIN_RTLD -ffreestanding CFLAGS+= -I${SRCTOP}/lib/csu/common .if exists(${.CURDIR}/${MACHINE_ARCH}) RTLD_ARCH= ${MACHINE_ARCH} .else RTLD_ARCH= ${MACHINE_CPUARCH} .endif CFLAGS+= -I${.CURDIR}/${RTLD_ARCH} -I${.CURDIR} .if ${MACHINE_ARCH} == "powerpc64" LDFLAGS+= -nostdlib -e _rtld_start .else LDFLAGS+= -nostdlib -e .rtld_start .endif NO_WCAST_ALIGN= yes WARNS?= 6 INSTALLFLAGS= -C -b PRECIOUSPROG= BINDIR= /libexec SYMLINKS= ../..${BINDIR}/${PROG} ${LIBEXECDIR}/${PROG} MLINKS= rtld.1 ld-elf.so.1.1 \ rtld.1 ld.so.1 .if ${MACHINE_CPUARCH} == "sparc64" CFLAGS+= -fPIC .else CFLAGS+= -fpic .endif CFLAGS+= -DPIC $(DEBUG) .if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386" CFLAGS+= -fvisibility=hidden .endif .if ${MACHINE_CPUARCH} == "mips" CFLAGS.reloc.c+=-fno-jump-tables .endif LDFLAGS+= -shared -Wl,-Bsymbolic -Wl,-z,defs -LIBADD= c_nossp_pic +# Pull in the dependencies that we use from libc +.include "rtld-libc/Makefile.inc" .if ${MK_TOOLCHAIN} == "no" LDFLAGS+= -L${LIBCDIR} .endif .if ${MACHINE_CPUARCH} == "arm" # Some of the required math functions (div & mod) are implemented in # libcompiler_rt on ARM. The library also needs to be placed first to be # correctly linked. As some of the functions are used before we have # shared libraries. LIBADD+= compiler_rt .endif .if ${MK_SYMVER} == "yes" VERSION_DEF= ${LIBCSRCDIR}/Versions.def SYMBOL_MAPS= ${.CURDIR}/Symbol.map VERSION_MAP= Version.map LDFLAGS+= -Wl,--version-script=${VERSION_MAP} .if exists(${.CURDIR}/${RTLD_ARCH}/Symbol.map) SYMBOL_MAPS+= ${.CURDIR}/${RTLD_ARCH}/Symbol.map .endif .endif .sinclude "${.CURDIR}/${RTLD_ARCH}/Makefile.inc" # Since moving rtld-elf to /libexec, we need to create a symlink. # Fixup the existing binary that's there so we can symlink over it. beforeinstall: .if exists(${DESTDIR}/usr/libexec/${PROG}) && ${MK_STAGING} == "no" -chflags -h noschg ${DESTDIR}/usr/libexec/${PROG} .endif .PATH: ${.CURDIR}/${RTLD_ARCH} HAS_TESTS= SUBDIR.${MK_TESTS}+= tests .include ${PROG_FULL}: ${VERSION_MAP} .include .if ${COMPILER_TYPE} == "gcc" # GCC warns about redeclarations even though they have __exported # and are therefore not identical to the ones from the system headers. CFLAGS+= -Wno-redundant-decls .if ${COMPILER_VERSION} < 40300 # Silence -Wshadow false positives in ancient GCC CFLAGS+= -Wno-shadow .endif .endif Index: head/libexec/rtld-elf/libmap.c =================================================================== --- head/libexec/rtld-elf/libmap.c (revision 349553) +++ head/libexec/rtld-elf/libmap.c (revision 349554) @@ -1,492 +1,493 @@ /* * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include "debug.h" #include "rtld.h" #include "libmap.h" #include "paths.h" +#include "rtld_libc.h" TAILQ_HEAD(lm_list, lm); struct lm { char *f; char *t; TAILQ_ENTRY(lm) lm_link; }; static TAILQ_HEAD(lmp_list, lmp) lmp_head = TAILQ_HEAD_INITIALIZER(lmp_head); struct lmp { char *p; enum { T_EXACT=0, T_BASENAME, T_DIRECTORY } type; struct lm_list lml; TAILQ_ENTRY(lmp) lmp_link; }; static TAILQ_HEAD(lmc_list, lmc) lmc_head = TAILQ_HEAD_INITIALIZER(lmc_head); struct lmc { char *path; dev_t dev; ino_t ino; TAILQ_ENTRY(lmc) next; }; static int lm_count; static void lmc_parse(char *, size_t); static void lmc_parse_file(const char *); static void lmc_parse_dir(const char *); static void lm_add(const char *, const char *, const char *); static void lm_free(struct lm_list *); static char *lml_find(struct lm_list *, const char *); static struct lm_list *lmp_find(const char *); static struct lm_list *lmp_init(char *); static const char *quickbasename(const char *); #define iseol(c) (((c) == '#') || ((c) == '\0') || \ ((c) == '\n') || ((c) == '\r')) /* * Do not use ctype.h macros, which rely on working TLS. It is * too early to have thread-local variables functional. */ #define rtld_isspace(c) ((c) == ' ' || (c) == '\t') int lm_init(char *libmap_override) { char *p; dbg("lm_init(\"%s\")", libmap_override); TAILQ_INIT(&lmp_head); lmc_parse_file(ld_path_libmap_conf); if (libmap_override) { /* * Do some character replacement to make $LDLIBMAP look * like a text file, then parse it. */ libmap_override = xstrdup(libmap_override); for (p = libmap_override; *p; p++) { switch (*p) { case '=': *p = ' '; break; case ',': *p = '\n'; break; } } lmc_parse(libmap_override, p - libmap_override); free(libmap_override); } return (lm_count == 0); } static void lmc_parse_file(const char *path) { struct lmc *p; char *lm_map; struct stat st; ssize_t retval; int fd; TAILQ_FOREACH(p, &lmc_head, next) { if (strcmp(p->path, path) == 0) return; } fd = open(path, O_RDONLY | O_CLOEXEC); if (fd == -1) { dbg("lm_parse_file: open(\"%s\") failed, %s", path, rtld_strerror(errno)); return; } if (fstat(fd, &st) == -1) { close(fd); dbg("lm_parse_file: fstat(\"%s\") failed, %s", path, rtld_strerror(errno)); return; } TAILQ_FOREACH(p, &lmc_head, next) { if (p->dev == st.st_dev && p->ino == st.st_ino) { close(fd); return; } } lm_map = xmalloc(st.st_size); retval = read(fd, lm_map, st.st_size); if (retval != st.st_size) { close(fd); free(lm_map); dbg("lm_parse_file: read(\"%s\") failed, %s", path, rtld_strerror(errno)); return; } close(fd); p = xmalloc(sizeof(struct lmc)); p->path = xstrdup(path); p->dev = st.st_dev; p->ino = st.st_ino; TAILQ_INSERT_HEAD(&lmc_head, p, next); lmc_parse(lm_map, st.st_size); free(lm_map); } static void lmc_parse_dir(const char *idir) { DIR *d; struct dirent *dp; struct lmc *p; char conffile[MAXPATHLEN]; char *ext; TAILQ_FOREACH(p, &lmc_head, next) { if (strcmp(p->path, idir) == 0) return; } d = opendir(idir); if (d == NULL) return; p = xmalloc(sizeof(struct lmc)); p->path = xstrdup(idir); p->dev = NODEV; p->ino = 0; TAILQ_INSERT_HEAD(&lmc_head, p, next); while ((dp = readdir(d)) != NULL) { if (dp->d_ino == 0) continue; if (dp->d_type != DT_REG) continue; ext = strrchr(dp->d_name, '.'); if (ext == NULL) continue; if (strcmp(ext, ".conf") != 0) continue; if (strlcpy(conffile, idir, MAXPATHLEN) >= MAXPATHLEN) continue; /* too long */ if (strlcat(conffile, "/", MAXPATHLEN) >= MAXPATHLEN) continue; /* too long */ if (strlcat(conffile, dp->d_name, MAXPATHLEN) >= MAXPATHLEN) continue; /* too long */ lmc_parse_file(conffile); } closedir(d); } static void lmc_parse(char *lm_p, size_t lm_len) { char *cp, *f, *t, *c, *p; char prog[MAXPATHLEN]; /* allow includedir + full length path */ char line[MAXPATHLEN + 13]; size_t cnt, i; cnt = 0; p = NULL; while (cnt < lm_len) { i = 0; while (cnt < lm_len && lm_p[cnt] != '\n' && i < sizeof(line) - 1) { line[i] = lm_p[cnt]; cnt++; i++; } line[i] = '\0'; while (cnt < lm_len && lm_p[cnt] != '\n') cnt++; /* skip over nl */ cnt++; cp = &line[0]; t = f = c = NULL; /* Skip over leading space */ while (rtld_isspace(*cp)) cp++; /* Found a comment or EOL */ if (iseol(*cp)) continue; /* Found a constraint selector */ if (*cp == '[') { cp++; /* Skip leading space */ while (rtld_isspace(*cp)) cp++; /* Found comment, EOL or end of selector */ if (iseol(*cp) || *cp == ']') continue; c = cp++; /* Skip to end of word */ while (!rtld_isspace(*cp) && !iseol(*cp) && *cp != ']') cp++; /* Skip and zero out trailing space */ while (rtld_isspace(*cp)) *cp++ = '\0'; /* Check if there is a closing brace */ if (*cp != ']') continue; /* Terminate string if there was no trailing space */ *cp++ = '\0'; /* * There should be nothing except whitespace or comment from this point to the end of the line. */ while (rtld_isspace(*cp)) cp++; if (!iseol(*cp)) continue; if (strlcpy(prog, c, sizeof prog) >= sizeof prog) continue; p = prog; continue; } /* Parse the 'from' candidate. */ f = cp++; while (!rtld_isspace(*cp) && !iseol(*cp)) cp++; /* Skip and zero out the trailing whitespace */ while (rtld_isspace(*cp)) *cp++ = '\0'; /* Found a comment or EOL */ if (iseol(*cp)) continue; /* Parse 'to' mapping */ t = cp++; while (!rtld_isspace(*cp) && !iseol(*cp)) cp++; /* Skip and zero out the trailing whitespace */ while (rtld_isspace(*cp)) *cp++ = '\0'; /* Should be no extra tokens at this point */ if (!iseol(*cp)) continue; *cp = '\0'; if (strcmp(f, "includedir") == 0) lmc_parse_dir(t); else if (strcmp(f, "include") == 0) lmc_parse_file(t); else lm_add(p, f, t); } } static void lm_free(struct lm_list *lml) { struct lm *lm; dbg("%s(%p)", __func__, lml); while (!TAILQ_EMPTY(lml)) { lm = TAILQ_FIRST(lml); TAILQ_REMOVE(lml, lm, lm_link); free(lm->f); free(lm->t); free(lm); } } void lm_fini(void) { struct lmp *lmp; struct lmc *p; dbg("%s()", __func__); while (!TAILQ_EMPTY(&lmc_head)) { p = TAILQ_FIRST(&lmc_head); TAILQ_REMOVE(&lmc_head, p, next); free(p->path); free(p); } while (!TAILQ_EMPTY(&lmp_head)) { lmp = TAILQ_FIRST(&lmp_head); TAILQ_REMOVE(&lmp_head, lmp, lmp_link); free(lmp->p); lm_free(&lmp->lml); free(lmp); } } static void lm_add(const char *p, const char *f, const char *t) { struct lm_list *lml; struct lm *lm; const char *t1; if (p == NULL) p = "$DEFAULT$"; dbg("%s(\"%s\", \"%s\", \"%s\")", __func__, p, f, t); if ((lml = lmp_find(p)) == NULL) lml = lmp_init(xstrdup(p)); t1 = lml_find(lml, f); if (t1 == NULL || strcmp(t1, t) != 0) { lm = xmalloc(sizeof(struct lm)); lm->f = xstrdup(f); lm->t = xstrdup(t); TAILQ_INSERT_HEAD(lml, lm, lm_link); lm_count++; } } char * lm_find(const char *p, const char *f) { struct lm_list *lml; char *t; dbg("%s(\"%s\", \"%s\")", __func__, p, f); if (p != NULL && (lml = lmp_find(p)) != NULL) { t = lml_find(lml, f); if (t != NULL) { /* * Add a global mapping if we have * a successful constrained match. */ lm_add(NULL, f, t); return (t); } } lml = lmp_find("$DEFAULT$"); if (lml != NULL) return (lml_find(lml, f)); return (NULL); } /* * Given a libmap translation list and a library name, return the * replacement library, or NULL. */ char * lm_findn(const char *p, const char *f, const size_t n) { char pathbuf[64], *s, *t; if (n < sizeof(pathbuf) - 1) s = pathbuf; else s = xmalloc(n + 1); memcpy(s, f, n); s[n] = '\0'; t = lm_find(p, s); if (s != pathbuf) free(s); return (t); } static char * lml_find(struct lm_list *lmh, const char *f) { struct lm *lm; dbg("%s(%p, \"%s\")", __func__, lmh, f); TAILQ_FOREACH(lm, lmh, lm_link) { if (strcmp(f, lm->f) == 0) return (lm->t); } return (NULL); } /* * Given an executable name, return a pointer to the translation list or * NULL if no matches. */ static struct lm_list * lmp_find(const char *n) { struct lmp *lmp; dbg("%s(\"%s\")", __func__, n); TAILQ_FOREACH(lmp, &lmp_head, lmp_link) { if ((lmp->type == T_EXACT && strcmp(n, lmp->p) == 0) || (lmp->type == T_DIRECTORY && strncmp(n, lmp->p, strlen(lmp->p)) == 0) || (lmp->type == T_BASENAME && strcmp(quickbasename(n), lmp->p) == 0)) return (&lmp->lml); } return (NULL); } static struct lm_list * lmp_init(char *n) { struct lmp *lmp; dbg("%s(\"%s\")", __func__, n); lmp = xmalloc(sizeof(struct lmp)); lmp->p = n; if (n[strlen(n) - 1] == '/') lmp->type = T_DIRECTORY; else if (strchr(n,'/') == NULL) lmp->type = T_BASENAME; else lmp->type = T_EXACT; TAILQ_INIT(&lmp->lml); TAILQ_INSERT_HEAD(&lmp_head, lmp, lmp_link); return (&lmp->lml); } /* * libc basename is overkill. Return a pointer to the character after * the last /, or the original string if there are no slashes. */ static const char * quickbasename(const char *path) { const char *p; for (p = path; *path != '\0'; path++) { if (*path == '/') p = path + 1; } return (p); } Index: head/libexec/rtld-elf/rtld-libc/Makefile.inc =================================================================== --- head/libexec/rtld-elf/rtld-libc/Makefile.inc (nonexistent) +++ head/libexec/rtld-elf/rtld-libc/Makefile.inc (revision 349554) @@ -0,0 +1,101 @@ +# $FreeBSD$ +# This makefiles adds the necessary libc dependencies for RTLD without pulling +# in all of the complex libc bits such as locales, etc. + +.include + +LIBC_SRCTOP=${SRCTOP}/lib/libc +.if exists(${LIBC_SRCTOP}/${MACHINE_ARCH}) +LIBC_ARCH=${MACHINE_ARCH} +.else +LIBC_ARCH=${MACHINE_CPUARCH} +.endif + +CFLAGS+= -I${SRCTOP}/libexec/rtld-elf/rtld-libc + +# Build all the libc files that use interposed symbols or pthreads again for +# RTLD. We compile with a different libc_private.h and namespace.h that +# redirects all calls to interposed functions to use the non-interposed version +# instead. +.PATH: ${LIBC_SRCTOP}/gen +SRCS+= opendir.c closedir.c readdir.c telldir.c + +# Avoid further dependencies by providing simple implementations of libc +# functions such as __error(), etc. +.PATH: ${SRCTOP}/libexec/rtld-elf/rtld-libc +SRCS+= rtld_libc.c + +# Now build the remaining files from libc: +.PATH: ${LIBC_SRCTOP}/stdlib +SRCS+= reallocf.c realpath.c getenv.c merge.c reallocarray.c +# TODO: fix merge.c to build with WARNS=6 +.if ${COMPILER_TYPE} == "clang" +CFLAGS.merge.c+=-Wno-error=null-pointer-arithmetic +.endif +.PATH: ${LIBC_SRCTOP}/gen +SRCS+= errlst.c getcwd.c getprogname.c raise.c sigsetops.c sysctlnametomib.c \ + __xuname.c +# errlst.c needs the errlst.h header from libc: +CFLAGS.errlst.c+=-I${LIBC_SRCTOP}/include + +# Use the string and memory .o files from libc instead of rebuilding them (they +# might be using optimized assembly and duplicating that logic here is awkward). +_libc_string_objects= bcopy memchr memcmp memcpy memmove stpncpy strcat \ + strchr strcmp stpcpy strcpy strcspn strdup strlcat strlcpy strlen strncmp \ + strncpy strrchr strsep strspn strstr strtok +# Also use all the syscall .o files from libc_nossp_pic: +_libc_other_objects= sigsetjmp lstat stat fstat fstatat fstatfs syscall \ + cerror geteuid getegid munmap mprotect sysarch __sysctl issetugid __getcwd \ + utrace thr_self thr_kill pread mmap lseek _exit _fstat _fstatat _fstatfs \ + getdirentries _getdirentries _close _fcntl _open _openat _read \ + _sigprocmask _write readlink _setjmp setjmp setjmperr + + +# Finally add additional architecture-dependent libc dependencies +.if ${LIBC_ARCH} == "arm" +# ARM needs aeabi_unwind_cpp for _setjmp +_libc_other_objects+=aeabi_unwind_cpp +.elif ${LIBC_ARCH} == "i386" +# __udivdi3 is needed by kvprintf() in rtld_printf.c +# i386 also needs i386_set_gsbase for allocate_initial_tls() +_libc_other_objects+=udivdi3 qdivrem i386_set_gsbase +.elif ${LIBC_ARCH} == "powerpc" || ${LIBC_ARCH} == "powerpcspe" +# ppc needs __syncicache for reloc.c and __umoddi3+__udivdi3 for rtld_printf.c +_libc_other_objects+=syncicache umoddi3 udivdi3 qdivrem +# for some reason there is also a reference to abs() +_libc_other_objects+=abs +.elif ${LIBC_ARCH} == "powerpc64" +# ppc64 needs __syncicache for reloc.c +_libc_other_objects+=syncicache +.elif ${LIBC_ARCH} == "mips" +# 32-bit MIPS needs __umoddi3+__udivdi3 for rtld_printf.c +.if ${MACHINE_ARCH:Mmipsn32*} == "" && ${MACHINE_ARCH:Mmips64*} == "" +_libc_other_objects+=umoddi3 udivdi3 qdivrem +.endif +.elif ${LIBC_ARCH} == "sparc64" +# reloc.c uses __sparc_utrap which needs a lot of other object files +_libc_other_objects+=__sparc_utrap __sparc_utrap_fp_disabled __sparc_utrap_gen \ + __sparc_utrap_setup __sparc_utrap_align __sparc_utrap_emul kill getpid \ + fpu fpu_explode fpu_div fpu_reg fpu_sqrt fpu_implode fpu_subr fpu_add \ + fpu_compare fpu_mul +.endif + +# Extract all the .o files from libc_nossp_pic.a. This ensures that +# we don't accidentally pull in the interposing table or similar by linking +# directly against libc_nossp_pic.a +_rtld_libc_objs= +.for _obj in ${_libc_other_objects} ${_libc_string_objects} +_rtld_libc_objs+=${_obj}.nossppico +CLEANFILES+=${_obj}.nossppico +# LDFLAGS+= -Wl,--trace-symbol=${_obj} +.endfor +# LDFLAGS+= -Wl,--trace + +# We insert all the .o files from libc_nossp_pic.a into a new rtld_libc.a file +# to ensure that only .o files that are actually used end up being included. +rtld_libc.a: ${LIBC_NOSSP_PIC} ${SRCTOP}/libexec/rtld-elf/rtld-libc/Makefile.inc + ${AR} x ${LIBC_NOSSP_PIC} ${_rtld_libc_objs} + ${AR} cr ${.OBJDIR}/${.TARGET} ${_rtld_libc_objs} +CLEANFILES+=rtld_libc.a +LDADD+=${.OBJDIR}/rtld_libc.a +${PROG}: rtld_libc.a Property changes on: head/libexec/rtld-elf/rtld-libc/Makefile.inc ___________________________________________________________________ Added: svn:eol-style ## -0,0 +1 ## +native \ No newline at end of property Added: svn:keywords ## -0,0 +1 ## +FreeBSD=%H \ No newline at end of property Added: svn:mime-type ## -0,0 +1 ## +text/plain \ No newline at end of property Index: head/libexec/rtld-elf/rtld-libc/libc_private.h =================================================================== --- head/libexec/rtld-elf/rtld-libc/libc_private.h (nonexistent) +++ head/libexec/rtld-elf/rtld-libc/libc_private.h (revision 349554) @@ -0,0 +1,39 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2019 Alex Richadson + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory (Department of Computer Science and + * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the + * DARPA SSITH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#ifndef _RTLD_LIBC_PRIVATE_H_ +#define _RTLD_LIBC_PRIVATE_H_ + +#include "rtld_libc.h" + +#endif /* _RTLD_LIBC_PRIVATE_H_ */ Property changes on: head/libexec/rtld-elf/rtld-libc/libc_private.h ___________________________________________________________________ Added: svn:eol-style ## -0,0 +1 ## +native \ No newline at end of property Added: svn:keywords ## -0,0 +1 ## +FreeBSD=%H \ No newline at end of property Added: svn:mime-type ## -0,0 +1 ## +text/plain \ No newline at end of property Index: head/libexec/rtld-elf/rtld-libc/namespace.h =================================================================== --- head/libexec/rtld-elf/rtld-libc/namespace.h (nonexistent) +++ head/libexec/rtld-elf/rtld-libc/namespace.h (revision 349554) @@ -0,0 +1,39 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2019 Alex Richadson + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory (Department of Computer Science and + * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the + * DARPA SSITH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#define fcntl _fcntl +#define open _open +#define openat _openat +#define fstatfs _fstatfs +#define close _close +#define getdirentries _getdirentries Property changes on: head/libexec/rtld-elf/rtld-libc/namespace.h ___________________________________________________________________ Added: svn:eol-style ## -0,0 +1 ## +native \ No newline at end of property Added: svn:keywords ## -0,0 +1 ## +FreeBSD=%H \ No newline at end of property Added: svn:mime-type ## -0,0 +1 ## +text/plain \ No newline at end of property Index: head/libexec/rtld-elf/rtld-libc/rtld_libc.c =================================================================== --- head/libexec/rtld-elf/rtld-libc/rtld_libc.c (nonexistent) +++ head/libexec/rtld-elf/rtld-libc/rtld_libc.c (revision 349554) @@ -0,0 +1,140 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2019 Alex Richadson + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory (Department of Computer Science and + * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the + * DARPA SSITH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "rtld.h" +#include "rtld_printf.h" +#include "rtld_libc.h" + +/* + * Avoid dependencies from various libc calls on abort(). Since this is only + * used for assertions in RTLD, we can just raise SIGABRT directly. + */ +void +abort(void) +{ + raise(SIGABRT); + __builtin_trap(); +} + +static int rtld_errno; +int *__error(void); +int * +__error(void) +{ + + return (&rtld_errno); +} + +/* Avoid dependency on __libc_interposing, use the system call directly. */ +#undef sigprocmask +int +sigprocmask(int how, const sigset_t *set, sigset_t *oset) +{ + + return (__sys_sigprocmask(how, set, oset)); +} +__strong_reference(sigprocmask, __libc_sigprocmask); + +#if defined DEBUG || !defined(NDEBUG) +/* Provide an implementation of __assert that does not pull in fprintf() */ +void +__assert(const char *func, const char *file, int line, const char *failedexpr) +{ + + if (func == NULL) + (void)rtld_fdprintf(STDERR_FILENO, + "Assertion failed: (%s), file %s, line %d.\n", failedexpr, + file, line); + else + (void)rtld_fdprintf(STDERR_FILENO, + "Assertion failed: (%s), function %s, file %s, line %d.\n", + failedexpr, func, file, line); + abort(); + /* NOTREACHED */ +} +#endif + +/* + * Avoid pulling in all of pthreads from getpagesize(). + * It normally uses libc/gen/auxv.c which pulls in pthread_once(). + */ +int +getpagesize(void) +{ + int mib[2], value; + size_t size; + static int pagesize; + + if (pagesize != 0) + return (pagesize); + + if (npagesizes > 0) + pagesize = pagesizes[0]; + + if (pagesize == 0) { + mib[0] = CTL_HW; + mib[1] = HW_PAGESIZE; + size = sizeof(value); + if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) == -1) + pagesize = PAGE_SIZE; + else + pagesize = value; + } + + return (pagesize); +} + +extern int __sys___sysctl(const int *name, u_int namelen, void *oldp, + size_t *oldlenp, const void *newp, size_t newlen); + +int +sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, + const void *newp, size_t newlen) +{ + int retval; + + assert(name[0] != CTL_USER && "Not supported inside rtld!"); + retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen); + return (retval); +} Property changes on: head/libexec/rtld-elf/rtld-libc/rtld_libc.c ___________________________________________________________________ Added: svn:eol-style ## -0,0 +1 ## +native \ No newline at end of property Added: svn:keywords ## -0,0 +1 ## +FreeBSD=%H \ No newline at end of property Added: svn:mime-type ## -0,0 +1 ## +text/plain \ No newline at end of property Index: head/libexec/rtld-elf/rtld-libc/rtld_libc.h =================================================================== --- head/libexec/rtld-elf/rtld-libc/rtld_libc.h (nonexistent) +++ head/libexec/rtld-elf/rtld-libc/rtld_libc.h (revision 349554) @@ -0,0 +1,89 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2019 Alex Richadson + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory (Department of Computer Science and + * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the + * DARPA SSITH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#ifndef _RTLD_AVOID_LIBC_DEPS_H_ +#define _RTLD_AVOID_LIBC_DEPS_H_ + +#include +#include +#include +#include + +/* Avoid dependencies on libthr (used by closedir/opendir/readdir) */ +#define __isthreaded 0 +#define _pthread_mutex_lock(mtx) (void)0 +#define _pthread_mutex_unlock(mtx) (void)0 +#define _pthread_mutex_destroy(mtx) (void)0 +#define __libc_interposing error, must not use this variable inside rtld + +int __sys_close(int); +void __sys_exit(int) __dead2; +int __sys_fcntl(int, int, ...); +int __sys_fstat(int fd, struct stat *); +int __sys_fstatat(int, const char *, struct stat *, int); +int __sys___getcwd(char *, size_t); +int __sys_open(const char *, int, ...); +int __sys_openat(int, const char *, int, ...); +int __sys_sigprocmask(int, const sigset_t *, sigset_t *); +int __sys_thr_kill(long, int); +int __sys_thr_self(long *); +__ssize_t __sys_pread(int, void *, __size_t, __off_t); +__ssize_t __sys_read(int, void *, __size_t); +__ssize_t __sys_write(int, const void *, __size_t); + +extern char* __progname; +const char *_getprogname(void); +int __getosreldate(void); + + +/* + * Don't pull in any of the libc wrappers. Instead we use the system call + * directly inside RTLD to avoid pulling in __libc_interposing (which pulls + * in lots more object files). + */ +#define close(fd) __sys_close(fd) +#define _close(fd) __sys_close(fd) +#define exit(status) __sys_exit(status) +#define _exit(status) __sys_exit(status) +#define fcntl(fd, cmd, arg) __sys_fcntl(fd, cmd, arg) +#define _fcntl(fd, cmd, arg) __sys_fcntl(fd, cmd, arg) +#define _fstat(fd, sb) __sys_fstat(fd, sb) +#define open(path, ...) __sys_open(path, __VA_ARGS__) +#define pread(fd, buf, nbytes, offset) __sys_pread(fd, buf, nbytes, offset) +#define read(fd, buf, nbytes) __sys_read(fd, buf, nbytes) +#define sigprocmask(how, set, oset) __sys_sigprocmask(how, set, oset) +#define strerror(errno) rtld_strerror(errno) +#define _write(fd, buf, nbytes) __sys_write(fd, buf, nbytes) +#define write(fd, buf, nbytes) __sys_write(fd, buf, nbytes) + +#endif /* _RTLD_AVOID_LIBC_DEPS_H_ */ Property changes on: head/libexec/rtld-elf/rtld-libc/rtld_libc.h ___________________________________________________________________ Added: svn:eol-style ## -0,0 +1 ## +native \ No newline at end of property Added: svn:keywords ## -0,0 +1 ## +FreeBSD=%H \ No newline at end of property Added: svn:mime-type ## -0,0 +1 ## +text/plain \ No newline at end of property Index: head/libexec/rtld-elf/rtld-libc/un-namespace.h =================================================================== --- head/libexec/rtld-elf/rtld-libc/un-namespace.h (nonexistent) +++ head/libexec/rtld-elf/rtld-libc/un-namespace.h (revision 349554) @@ -0,0 +1,41 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2019 Alex Richadson + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory (Department of Computer Science and + * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the + * DARPA SSITH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#undef fcntl +#undef open +#undef openat +#undef close +#undef fstatfs +#undef getdirentries + +#include "rtld_libc.h" Property changes on: head/libexec/rtld-elf/rtld-libc/un-namespace.h ___________________________________________________________________ Added: svn:eol-style ## -0,0 +1 ## +native \ No newline at end of property Added: svn:keywords ## -0,0 +1 ## +FreeBSD=%H \ No newline at end of property Added: svn:mime-type ## -0,0 +1 ## +text/plain \ No newline at end of property Index: head/libexec/rtld-elf/rtld.c =================================================================== --- head/libexec/rtld-elf/rtld.c (revision 349553) +++ head/libexec/rtld-elf/rtld.c (revision 349554) @@ -1,5728 +1,5707 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright 1996, 1997, 1998, 1999, 2000 John D. Polstra. * Copyright 2003 Alexander Kabaev . * Copyright 2009-2013 Konstantin Belousov . * Copyright 2012 John Marino . * Copyright 2014-2017 The FreeBSD Foundation * All rights reserved. * * Portions of this software were developed by Konstantin Belousov * under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Dynamic linker for ELF. * * John Polstra . */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "debug.h" #include "rtld.h" #include "libmap.h" #include "paths.h" #include "rtld_tls.h" #include "rtld_printf.h" #include "rtld_malloc.h" #include "rtld_utrace.h" #include "notes.h" +#include "rtld_libc.h" /* Types. */ typedef void (*func_ptr_type)(void); typedef void * (*path_enum_proc) (const char *path, size_t len, void *arg); /* Variables that cannot be static: */ extern struct r_debug r_debug; /* For GDB */ extern int _thread_autoinit_dummy_decl; -extern char* __progname; extern void (*__cleanup)(void); /* * Function declarations. */ static const char *basename(const char *); static void digest_dynamic1(Obj_Entry *, int, const Elf_Dyn **, const Elf_Dyn **, const Elf_Dyn **); static void digest_dynamic2(Obj_Entry *, const Elf_Dyn *, const Elf_Dyn *, const Elf_Dyn *); static void digest_dynamic(Obj_Entry *, int); static Obj_Entry *digest_phdr(const Elf_Phdr *, int, caddr_t, const char *); static void distribute_static_tls(Objlist *, RtldLockState *); static Obj_Entry *dlcheck(void *); static int dlclose_locked(void *, RtldLockState *); static Obj_Entry *dlopen_object(const char *name, int fd, Obj_Entry *refobj, int lo_flags, int mode, RtldLockState *lockstate); static Obj_Entry *do_load_object(int, const char *, char *, struct stat *, int); static int do_search_info(const Obj_Entry *obj, int, struct dl_serinfo *); static bool donelist_check(DoneList *, const Obj_Entry *); static void errmsg_restore(char *); static char *errmsg_save(void); static void *fill_search_info(const char *, size_t, void *); static char *find_library(const char *, const Obj_Entry *, int *); static const char *gethints(bool); static void hold_object(Obj_Entry *); static void unhold_object(Obj_Entry *); static void init_dag(Obj_Entry *); static void init_marker(Obj_Entry *); static void init_pagesizes(Elf_Auxinfo **aux_info); static void init_rtld(caddr_t, Elf_Auxinfo **); static void initlist_add_neededs(Needed_Entry *, Objlist *); static void initlist_add_objects(Obj_Entry *, Obj_Entry *, Objlist *); static int initlist_objects_ifunc(Objlist *, bool, int, RtldLockState *); static void linkmap_add(Obj_Entry *); static void linkmap_delete(Obj_Entry *); static void load_filtees(Obj_Entry *, int flags, RtldLockState *); static void unload_filtees(Obj_Entry *, RtldLockState *); static int load_needed_objects(Obj_Entry *, int); static int load_preload_objects(void); static Obj_Entry *load_object(const char *, int fd, const Obj_Entry *, int); static void map_stacks_exec(RtldLockState *); static int obj_disable_relro(Obj_Entry *); static int obj_enforce_relro(Obj_Entry *); static Obj_Entry *obj_from_addr(const void *); static void objlist_call_fini(Objlist *, Obj_Entry *, RtldLockState *); static void objlist_call_init(Objlist *, RtldLockState *); static void objlist_clear(Objlist *); static Objlist_Entry *objlist_find(Objlist *, const Obj_Entry *); static void objlist_init(Objlist *); static void objlist_push_head(Objlist *, Obj_Entry *); static void objlist_push_tail(Objlist *, Obj_Entry *); static void objlist_put_after(Objlist *, Obj_Entry *, Obj_Entry *); static void objlist_remove(Objlist *, Obj_Entry *); static int open_binary_fd(const char *argv0, bool search_in_path); static int parse_args(char* argv[], int argc, bool *use_pathp, int *fdp); static int parse_integer(const char *); static void *path_enumerate(const char *, path_enum_proc, const char *, void *); static void print_usage(const char *argv0); static void release_object(Obj_Entry *); static int relocate_object_dag(Obj_Entry *root, bool bind_now, Obj_Entry *rtldobj, int flags, RtldLockState *lockstate); static int relocate_object(Obj_Entry *obj, bool bind_now, Obj_Entry *rtldobj, int flags, RtldLockState *lockstate); static int relocate_objects(Obj_Entry *, bool, Obj_Entry *, int, RtldLockState *); static int resolve_object_ifunc(Obj_Entry *, bool, int, RtldLockState *); static int rtld_dirname(const char *, char *); static int rtld_dirname_abs(const char *, char *); static void *rtld_dlopen(const char *name, int fd, int mode); static void rtld_exit(void); static void rtld_nop_exit(void); static char *search_library_path(const char *, const char *, const char *, int *); static char *search_library_pathfds(const char *, const char *, int *); static const void **get_program_var_addr(const char *, RtldLockState *); static void set_program_var(const char *, const void *); static int symlook_default(SymLook *, const Obj_Entry *refobj); static int symlook_global(SymLook *, DoneList *); static void symlook_init_from_req(SymLook *, const SymLook *); static int symlook_list(SymLook *, const Objlist *, DoneList *); static int symlook_needed(SymLook *, const Needed_Entry *, DoneList *); static int symlook_obj1_sysv(SymLook *, const Obj_Entry *); static int symlook_obj1_gnu(SymLook *, const Obj_Entry *); static void trace_loaded_objects(Obj_Entry *); static void unlink_object(Obj_Entry *); static void unload_object(Obj_Entry *, RtldLockState *lockstate); static void unref_dag(Obj_Entry *); static void ref_dag(Obj_Entry *); static char *origin_subst_one(Obj_Entry *, char *, const char *, const char *, bool); static char *origin_subst(Obj_Entry *, const char *); static bool obj_resolve_origin(Obj_Entry *obj); static void preinit_main(void); static int rtld_verify_versions(const Objlist *); static int rtld_verify_object_versions(Obj_Entry *); static void object_add_name(Obj_Entry *, const char *); static int object_match_name(const Obj_Entry *, const char *); static void ld_utrace_log(int, void *, void *, size_t, int, const char *); static void rtld_fill_dl_phdr_info(const Obj_Entry *obj, struct dl_phdr_info *phdr_info); static uint32_t gnu_hash(const char *); static bool matched_symbol(SymLook *, const Obj_Entry *, Sym_Match_Result *, const unsigned long); void r_debug_state(struct r_debug *, struct link_map *) __noinline __exported; void _r_debug_postinit(struct link_map *) __noinline __exported; int __sys_openat(int, const char *, int, ...); /* * Data declarations. */ static char *error_message; /* Message for dlerror(), or NULL */ struct r_debug r_debug __exported; /* for GDB; */ static bool libmap_disable; /* Disable libmap */ static bool ld_loadfltr; /* Immediate filters processing */ static char *libmap_override; /* Maps to use in addition to libmap.conf */ static bool trust; /* False for setuid and setgid programs */ static bool dangerous_ld_env; /* True if environment variables have been used to affect the libraries loaded */ bool ld_bind_not; /* Disable PLT update */ static char *ld_bind_now; /* Environment variable for immediate binding */ static char *ld_debug; /* Environment variable for debugging */ static char *ld_library_path; /* Environment variable for search path */ static char *ld_library_dirs; /* Environment variable for library descriptors */ static char *ld_preload; /* Environment variable for libraries to load first */ static const char *ld_elf_hints_path; /* Environment variable for alternative hints path */ static const char *ld_tracing; /* Called from ldd to print libs */ static char *ld_utrace; /* Use utrace() to log events. */ static struct obj_entry_q obj_list; /* Queue of all loaded objects */ static Obj_Entry *obj_main; /* The main program shared object */ static Obj_Entry obj_rtld; /* The dynamic linker shared object */ static unsigned int obj_count; /* Number of objects in obj_list */ static unsigned int obj_loads; /* Number of loads of objects (gen count) */ static Objlist list_global = /* Objects dlopened with RTLD_GLOBAL */ STAILQ_HEAD_INITIALIZER(list_global); static Objlist list_main = /* Objects loaded at program startup */ STAILQ_HEAD_INITIALIZER(list_main); static Objlist list_fini = /* Objects needing fini() calls */ STAILQ_HEAD_INITIALIZER(list_fini); Elf_Sym sym_zero; /* For resolving undefined weak refs. */ #define GDB_STATE(s,m) r_debug.r_state = s; r_debug_state(&r_debug,m); extern Elf_Dyn _DYNAMIC; #pragma weak _DYNAMIC int dlclose(void *) __exported; char *dlerror(void) __exported; void *dlopen(const char *, int) __exported; void *fdlopen(int, int) __exported; void *dlsym(void *, const char *) __exported; dlfunc_t dlfunc(void *, const char *) __exported; void *dlvsym(void *, const char *, const char *) __exported; int dladdr(const void *, Dl_info *) __exported; void dllockinit(void *, void *(*)(void *), void (*)(void *), void (*)(void *), void (*)(void *), void (*)(void *), void (*)(void *)) __exported; int dlinfo(void *, int , void *) __exported; int dl_iterate_phdr(__dl_iterate_hdr_callback, void *) __exported; int _rtld_addr_phdr(const void *, struct dl_phdr_info *) __exported; int _rtld_get_stack_prot(void) __exported; int _rtld_is_dlopened(void *) __exported; void _rtld_error(const char *, ...) __exported; /* Only here to fix -Wmissing-prototypes warnings */ int __getosreldate(void); -void __pthread_cxa_finalize(struct dl_phdr_info *a); func_ptr_type _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp); Elf_Addr _rtld_bind(Obj_Entry *obj, Elf_Size reloff); int npagesizes; static int osreldate; size_t *pagesizes; static int stack_prot = PROT_READ | PROT_WRITE | RTLD_DEFAULT_STACK_EXEC; static int max_stack_flags; /* * Global declarations normally provided by crt1. The dynamic linker is * not built with crt1, so we have to provide them ourselves. */ char *__progname; char **environ; /* * Used to pass argc, argv to init functions. */ int main_argc; char **main_argv; /* * Globals to control TLS allocation. */ size_t tls_last_offset; /* Static TLS offset of last module */ size_t tls_last_size; /* Static TLS size of last module */ size_t tls_static_space; /* Static TLS space allocated */ static size_t tls_static_max_align; Elf_Addr tls_dtv_generation = 1; /* Used to detect when dtv size changes */ int tls_max_index = 1; /* Largest module index allocated */ static bool ld_library_path_rpath = false; /* * Globals for path names, and such */ const char *ld_elf_hints_default = _PATH_ELF_HINTS; const char *ld_path_libmap_conf = _PATH_LIBMAP_CONF; const char *ld_path_rtld = _PATH_RTLD; const char *ld_standard_library_path = STANDARD_LIBRARY_PATH; const char *ld_env_prefix = LD_; static void (*rtld_exit_ptr)(void); /* * Fill in a DoneList with an allocation large enough to hold all of * the currently-loaded objects. Keep this as a macro since it calls * alloca and we want that to occur within the scope of the caller. */ #define donelist_init(dlp) \ ((dlp)->objs = alloca(obj_count * sizeof (dlp)->objs[0]), \ assert((dlp)->objs != NULL), \ (dlp)->num_alloc = obj_count, \ (dlp)->num_used = 0) #define LD_UTRACE(e, h, mb, ms, r, n) do { \ if (ld_utrace != NULL) \ ld_utrace_log(e, h, mb, ms, r, n); \ } while (0) static void ld_utrace_log(int event, void *handle, void *mapbase, size_t mapsize, int refcnt, const char *name) { struct utrace_rtld ut; static const char rtld_utrace_sig[RTLD_UTRACE_SIG_SZ] = RTLD_UTRACE_SIG; memcpy(ut.sig, rtld_utrace_sig, sizeof(ut.sig)); ut.event = event; ut.handle = handle; ut.mapbase = mapbase; ut.mapsize = mapsize; ut.refcnt = refcnt; bzero(ut.name, sizeof(ut.name)); if (name) strlcpy(ut.name, name, sizeof(ut.name)); utrace(&ut, sizeof(ut)); } #ifdef RTLD_VARIANT_ENV_NAMES /* * construct the env variable based on the type of binary that's * running. */ static inline const char * _LD(const char *var) { static char buffer[128]; strlcpy(buffer, ld_env_prefix, sizeof(buffer)); strlcat(buffer, var, sizeof(buffer)); return (buffer); } #else #define _LD(x) LD_ x #endif /* * Main entry point for dynamic linking. The first argument is the * stack pointer. The stack is expected to be laid out as described * in the SVR4 ABI specification, Intel 386 Processor Supplement. * Specifically, the stack pointer points to a word containing * ARGC. Following that in the stack is a null-terminated sequence * of pointers to argument strings. Then comes a null-terminated * sequence of pointers to environment strings. Finally, there is a * sequence of "auxiliary vector" entries. * * The second argument points to a place to store the dynamic linker's * exit procedure pointer and the third to a place to store the main * program's object. * * The return value is the main program's entry point. */ func_ptr_type _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp) { Elf_Auxinfo *aux, *auxp, *auxpf, *aux_info[AT_COUNT]; Objlist_Entry *entry; Obj_Entry *last_interposer, *obj, *preload_tail; const Elf_Phdr *phdr; Objlist initlist; RtldLockState lockstate; struct stat st; Elf_Addr *argcp; char **argv, **env, **envp, *kexecpath, *library_path_rpath; const char *argv0; caddr_t imgentry; char buf[MAXPATHLEN]; int argc, fd, i, phnum, rtld_argc; bool dir_enable, explicit_fd, search_in_path; /* * On entry, the dynamic linker itself has not been relocated yet. * Be very careful not to reference any global data until after * init_rtld has returned. It is OK to reference file-scope statics * and string constants, and to call static and global functions. */ /* Find the auxiliary vector on the stack. */ argcp = sp; argc = *sp++; argv = (char **) sp; sp += argc + 1; /* Skip over arguments and NULL terminator */ env = (char **) sp; while (*sp++ != 0) /* Skip over environment, and NULL terminator */ ; aux = (Elf_Auxinfo *) sp; /* Digest the auxiliary vector. */ for (i = 0; i < AT_COUNT; i++) aux_info[i] = NULL; for (auxp = aux; auxp->a_type != AT_NULL; auxp++) { if (auxp->a_type < AT_COUNT) aux_info[auxp->a_type] = auxp; } /* Initialize and relocate ourselves. */ assert(aux_info[AT_BASE] != NULL); init_rtld((caddr_t) aux_info[AT_BASE]->a_un.a_ptr, aux_info); __progname = obj_rtld.path; argv0 = argv[0] != NULL ? argv[0] : "(null)"; environ = env; main_argc = argc; main_argv = argv; trust = !issetugid(); md_abi_variant_hook(aux_info); fd = -1; if (aux_info[AT_EXECFD] != NULL) { fd = aux_info[AT_EXECFD]->a_un.a_val; } else { assert(aux_info[AT_PHDR] != NULL); phdr = (const Elf_Phdr *)aux_info[AT_PHDR]->a_un.a_ptr; if (phdr == obj_rtld.phdr) { if (!trust) { _rtld_error("Tainted process refusing to run binary %s", argv0); rtld_die(); } dbg("opening main program in direct exec mode"); if (argc >= 2) { rtld_argc = parse_args(argv, argc, &search_in_path, &fd); argv0 = argv[rtld_argc]; explicit_fd = (fd != -1); if (!explicit_fd) fd = open_binary_fd(argv0, search_in_path); if (fstat(fd, &st) == -1) { _rtld_error("Failed to fstat FD %d (%s): %s", fd, explicit_fd ? "user-provided descriptor" : argv0, rtld_strerror(errno)); rtld_die(); } /* * Rough emulation of the permission checks done by * execve(2), only Unix DACs are checked, ACLs are * ignored. Preserve the semantic of disabling owner * to execute if owner x bit is cleared, even if * others x bit is enabled. * mmap(2) does not allow to mmap with PROT_EXEC if * binary' file comes from noexec mount. We cannot * set a text reference on the binary. */ dir_enable = false; if (st.st_uid == geteuid()) { if ((st.st_mode & S_IXUSR) != 0) dir_enable = true; } else if (st.st_gid == getegid()) { if ((st.st_mode & S_IXGRP) != 0) dir_enable = true; } else if ((st.st_mode & S_IXOTH) != 0) { dir_enable = true; } if (!dir_enable) { _rtld_error("No execute permission for binary %s", argv0); rtld_die(); } /* * For direct exec mode, argv[0] is the interpreter * name, we must remove it and shift arguments left * before invoking binary main. Since stack layout * places environment pointers and aux vectors right * after the terminating NULL, we must shift * environment and aux as well. */ main_argc = argc - rtld_argc; for (i = 0; i <= main_argc; i++) argv[i] = argv[i + rtld_argc]; *argcp -= rtld_argc; environ = env = envp = argv + main_argc + 1; do { *envp = *(envp + rtld_argc); envp++; } while (*envp != NULL); aux = auxp = (Elf_Auxinfo *)envp; auxpf = (Elf_Auxinfo *)(envp + rtld_argc); for (;; auxp++, auxpf++) { *auxp = *auxpf; if (auxp->a_type == AT_NULL) break; } } else { _rtld_error("No binary"); rtld_die(); } } } ld_bind_now = getenv(_LD("BIND_NOW")); /* * If the process is tainted, then we un-set the dangerous environment * variables. The process will be marked as tainted until setuid(2) * is called. If any child process calls setuid(2) we do not want any * future processes to honor the potentially un-safe variables. */ if (!trust) { if (unsetenv(_LD("PRELOAD")) || unsetenv(_LD("LIBMAP")) || unsetenv(_LD("LIBRARY_PATH")) || unsetenv(_LD("LIBRARY_PATH_FDS")) || unsetenv(_LD("LIBMAP_DISABLE")) || unsetenv(_LD("BIND_NOT")) || unsetenv(_LD("DEBUG")) || unsetenv(_LD("ELF_HINTS_PATH")) || unsetenv(_LD("LOADFLTR")) || unsetenv(_LD("LIBRARY_PATH_RPATH"))) { _rtld_error("environment corrupt; aborting"); rtld_die(); } } ld_debug = getenv(_LD("DEBUG")); if (ld_bind_now == NULL) ld_bind_not = getenv(_LD("BIND_NOT")) != NULL; libmap_disable = getenv(_LD("LIBMAP_DISABLE")) != NULL; libmap_override = getenv(_LD("LIBMAP")); ld_library_path = getenv(_LD("LIBRARY_PATH")); ld_library_dirs = getenv(_LD("LIBRARY_PATH_FDS")); ld_preload = getenv(_LD("PRELOAD")); ld_elf_hints_path = getenv(_LD("ELF_HINTS_PATH")); ld_loadfltr = getenv(_LD("LOADFLTR")) != NULL; library_path_rpath = getenv(_LD("LIBRARY_PATH_RPATH")); if (library_path_rpath != NULL) { if (library_path_rpath[0] == 'y' || library_path_rpath[0] == 'Y' || library_path_rpath[0] == '1') ld_library_path_rpath = true; else ld_library_path_rpath = false; } dangerous_ld_env = libmap_disable || (libmap_override != NULL) || (ld_library_path != NULL) || (ld_preload != NULL) || (ld_elf_hints_path != NULL) || ld_loadfltr; ld_tracing = getenv(_LD("TRACE_LOADED_OBJECTS")); ld_utrace = getenv(_LD("UTRACE")); if ((ld_elf_hints_path == NULL) || strlen(ld_elf_hints_path) == 0) ld_elf_hints_path = ld_elf_hints_default; if (ld_debug != NULL && *ld_debug != '\0') debug = 1; dbg("%s is initialized, base address = %p", __progname, (caddr_t) aux_info[AT_BASE]->a_un.a_ptr); dbg("RTLD dynamic = %p", obj_rtld.dynamic); dbg("RTLD pltgot = %p", obj_rtld.pltgot); dbg("initializing thread locks"); lockdflt_init(); /* * Load the main program, or process its program header if it is * already loaded. */ if (fd != -1) { /* Load the main program. */ dbg("loading main program"); obj_main = map_object(fd, argv0, NULL); close(fd); if (obj_main == NULL) rtld_die(); max_stack_flags = obj_main->stack_flags; } else { /* Main program already loaded. */ dbg("processing main program's program header"); assert(aux_info[AT_PHDR] != NULL); phdr = (const Elf_Phdr *) aux_info[AT_PHDR]->a_un.a_ptr; assert(aux_info[AT_PHNUM] != NULL); phnum = aux_info[AT_PHNUM]->a_un.a_val; assert(aux_info[AT_PHENT] != NULL); assert(aux_info[AT_PHENT]->a_un.a_val == sizeof(Elf_Phdr)); assert(aux_info[AT_ENTRY] != NULL); imgentry = (caddr_t) aux_info[AT_ENTRY]->a_un.a_ptr; if ((obj_main = digest_phdr(phdr, phnum, imgentry, argv0)) == NULL) rtld_die(); } if (aux_info[AT_EXECPATH] != NULL && fd == -1) { kexecpath = aux_info[AT_EXECPATH]->a_un.a_ptr; dbg("AT_EXECPATH %p %s", kexecpath, kexecpath); if (kexecpath[0] == '/') obj_main->path = kexecpath; else if (getcwd(buf, sizeof(buf)) == NULL || strlcat(buf, "/", sizeof(buf)) >= sizeof(buf) || strlcat(buf, kexecpath, sizeof(buf)) >= sizeof(buf)) obj_main->path = xstrdup(argv0); else obj_main->path = xstrdup(buf); } else { dbg("No AT_EXECPATH or direct exec"); obj_main->path = xstrdup(argv0); } dbg("obj_main path %s", obj_main->path); obj_main->mainprog = true; if (aux_info[AT_STACKPROT] != NULL && aux_info[AT_STACKPROT]->a_un.a_val != 0) stack_prot = aux_info[AT_STACKPROT]->a_un.a_val; #ifndef COMPAT_32BIT /* * Get the actual dynamic linker pathname from the executable if * possible. (It should always be possible.) That ensures that * gdb will find the right dynamic linker even if a non-standard * one is being used. */ if (obj_main->interp != NULL && strcmp(obj_main->interp, obj_rtld.path) != 0) { free(obj_rtld.path); obj_rtld.path = xstrdup(obj_main->interp); __progname = obj_rtld.path; } #endif digest_dynamic(obj_main, 0); dbg("%s valid_hash_sysv %d valid_hash_gnu %d dynsymcount %d", obj_main->path, obj_main->valid_hash_sysv, obj_main->valid_hash_gnu, obj_main->dynsymcount); linkmap_add(obj_main); linkmap_add(&obj_rtld); /* Link the main program into the list of objects. */ TAILQ_INSERT_HEAD(&obj_list, obj_main, next); obj_count++; obj_loads++; /* Initialize a fake symbol for resolving undefined weak references. */ sym_zero.st_info = ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE); sym_zero.st_shndx = SHN_UNDEF; sym_zero.st_value = -(uintptr_t)obj_main->relocbase; if (!libmap_disable) libmap_disable = (bool)lm_init(libmap_override); dbg("loading LD_PRELOAD libraries"); if (load_preload_objects() == -1) rtld_die(); preload_tail = globallist_curr(TAILQ_LAST(&obj_list, obj_entry_q)); dbg("loading needed objects"); if (load_needed_objects(obj_main, 0) == -1) rtld_die(); /* Make a list of all objects loaded at startup. */ last_interposer = obj_main; TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker) continue; if (obj->z_interpose && obj != obj_main) { objlist_put_after(&list_main, last_interposer, obj); last_interposer = obj; } else { objlist_push_tail(&list_main, obj); } obj->refcount++; } dbg("checking for required versions"); if (rtld_verify_versions(&list_main) == -1 && !ld_tracing) rtld_die(); if (ld_tracing) { /* We're done */ trace_loaded_objects(obj_main); exit(0); } if (getenv(_LD("DUMP_REL_PRE")) != NULL) { dump_relocations(obj_main); exit (0); } /* * Processing tls relocations requires having the tls offsets * initialized. Prepare offsets before starting initial * relocation processing. */ dbg("initializing initial thread local storage offsets"); STAILQ_FOREACH(entry, &list_main, link) { /* * Allocate all the initial objects out of the static TLS * block even if they didn't ask for it. */ allocate_tls_offset(entry->obj); } if (relocate_objects(obj_main, ld_bind_now != NULL && *ld_bind_now != '\0', &obj_rtld, SYMLOOK_EARLY, NULL) == -1) rtld_die(); dbg("doing copy relocations"); if (do_copy_relocations(obj_main) == -1) rtld_die(); if (getenv(_LD("DUMP_REL_POST")) != NULL) { dump_relocations(obj_main); exit (0); } ifunc_init(aux); /* * Setup TLS for main thread. This must be done after the * relocations are processed, since tls initialization section * might be the subject for relocations. */ dbg("initializing initial thread local storage"); allocate_initial_tls(globallist_curr(TAILQ_FIRST(&obj_list))); dbg("initializing key program variables"); set_program_var("__progname", argv[0] != NULL ? basename(argv[0]) : ""); set_program_var("environ", env); set_program_var("__elf_aux_vector", aux); /* Make a list of init functions to call. */ objlist_init(&initlist); initlist_add_objects(globallist_curr(TAILQ_FIRST(&obj_list)), preload_tail, &initlist); r_debug_state(NULL, &obj_main->linkmap); /* say hello to gdb! */ map_stacks_exec(NULL); if (!obj_main->crt_no_init) { /* * Make sure we don't call the main program's init and fini * functions for binaries linked with old crt1 which calls * _init itself. */ obj_main->init = obj_main->fini = (Elf_Addr)NULL; obj_main->preinit_array = obj_main->init_array = obj_main->fini_array = (Elf_Addr)NULL; } /* * Execute MD initializers required before we call the objects' * init functions. */ pre_init(); wlock_acquire(rtld_bind_lock, &lockstate); dbg("resolving ifuncs"); if (initlist_objects_ifunc(&initlist, ld_bind_now != NULL && *ld_bind_now != '\0', SYMLOOK_EARLY, &lockstate) == -1) rtld_die(); rtld_exit_ptr = rtld_exit; if (obj_main->crt_no_init) preinit_main(); objlist_call_init(&initlist, &lockstate); _r_debug_postinit(&obj_main->linkmap); objlist_clear(&initlist); dbg("loading filtees"); TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker) continue; if (ld_loadfltr || obj->z_loadfltr) load_filtees(obj, 0, &lockstate); } dbg("enforcing main obj relro"); if (obj_enforce_relro(obj_main) == -1) rtld_die(); lock_release(rtld_bind_lock, &lockstate); dbg("transferring control to program entry point = %p", obj_main->entry); /* Return the exit procedure and the program entry point. */ *exit_proc = rtld_exit_ptr; *objp = obj_main; return (func_ptr_type) obj_main->entry; } void * rtld_resolve_ifunc(const Obj_Entry *obj, const Elf_Sym *def) { void *ptr; Elf_Addr target; ptr = (void *)make_function_pointer(def, obj); target = call_ifunc_resolver(ptr); return ((void *)target); } /* * NB: MIPS uses a private version of this function (_mips_rtld_bind). * Changes to this function should be applied there as well. */ Elf_Addr _rtld_bind(Obj_Entry *obj, Elf_Size reloff) { const Elf_Rel *rel; const Elf_Sym *def; const Obj_Entry *defobj; Elf_Addr *where; Elf_Addr target; RtldLockState lockstate; rlock_acquire(rtld_bind_lock, &lockstate); if (sigsetjmp(lockstate.env, 0) != 0) lock_upgrade(rtld_bind_lock, &lockstate); if (obj->pltrel) rel = (const Elf_Rel *)((const char *)obj->pltrel + reloff); else rel = (const Elf_Rel *)((const char *)obj->pltrela + reloff); where = (Elf_Addr *)(obj->relocbase + rel->r_offset); def = find_symdef(ELF_R_SYM(rel->r_info), obj, &defobj, SYMLOOK_IN_PLT, NULL, &lockstate); if (def == NULL) rtld_die(); if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) target = (Elf_Addr)rtld_resolve_ifunc(defobj, def); else target = (Elf_Addr)(defobj->relocbase + def->st_value); dbg("\"%s\" in \"%s\" ==> %p in \"%s\"", defobj->strtab + def->st_name, basename(obj->path), (void *)target, basename(defobj->path)); /* * Write the new contents for the jmpslot. Note that depending on * architecture, the value which we need to return back to the * lazy binding trampoline may or may not be the target * address. The value returned from reloc_jmpslot() is the value * that the trampoline needs. */ target = reloc_jmpslot(where, target, defobj, obj, rel); lock_release(rtld_bind_lock, &lockstate); return target; } /* * Error reporting function. Use it like printf. If formats the message * into a buffer, and sets things up so that the next call to dlerror() * will return the message. */ void _rtld_error(const char *fmt, ...) { static char buf[512]; va_list ap; va_start(ap, fmt); rtld_vsnprintf(buf, sizeof buf, fmt, ap); error_message = buf; va_end(ap); LD_UTRACE(UTRACE_RTLD_ERROR, NULL, NULL, 0, 0, error_message); } /* * Return a dynamically-allocated copy of the current error message, if any. */ static char * errmsg_save(void) { return error_message == NULL ? NULL : xstrdup(error_message); } /* * Restore the current error message from a copy which was previously saved * by errmsg_save(). The copy is freed. */ static void errmsg_restore(char *saved_msg) { if (saved_msg == NULL) error_message = NULL; else { _rtld_error("%s", saved_msg); free(saved_msg); } } static const char * basename(const char *name) { const char *p = strrchr(name, '/'); return p != NULL ? p + 1 : name; } static struct utsname uts; static char * origin_subst_one(Obj_Entry *obj, char *real, const char *kw, const char *subst, bool may_free) { char *p, *p1, *res, *resp; int subst_len, kw_len, subst_count, old_len, new_len; kw_len = strlen(kw); /* * First, count the number of the keyword occurrences, to * preallocate the final string. */ for (p = real, subst_count = 0;; p = p1 + kw_len, subst_count++) { p1 = strstr(p, kw); if (p1 == NULL) break; } /* * If the keyword is not found, just return. * * Return non-substituted string if resolution failed. We * cannot do anything more reasonable, the failure mode of the * caller is unresolved library anyway. */ if (subst_count == 0 || (obj != NULL && !obj_resolve_origin(obj))) return (may_free ? real : xstrdup(real)); if (obj != NULL) subst = obj->origin_path; /* * There is indeed something to substitute. Calculate the * length of the resulting string, and allocate it. */ subst_len = strlen(subst); old_len = strlen(real); new_len = old_len + (subst_len - kw_len) * subst_count; res = xmalloc(new_len + 1); /* * Now, execute the substitution loop. */ for (p = real, resp = res, *resp = '\0';;) { p1 = strstr(p, kw); if (p1 != NULL) { /* Copy the prefix before keyword. */ memcpy(resp, p, p1 - p); resp += p1 - p; /* Keyword replacement. */ memcpy(resp, subst, subst_len); resp += subst_len; *resp = '\0'; p = p1 + kw_len; } else break; } /* Copy to the end of string and finish. */ strcat(resp, p); if (may_free) free(real); return (res); } static char * origin_subst(Obj_Entry *obj, const char *real) { char *res1, *res2, *res3, *res4; if (obj == NULL || !trust) return (xstrdup(real)); if (uts.sysname[0] == '\0') { if (uname(&uts) != 0) { _rtld_error("utsname failed: %d", errno); return (NULL); } } /* __DECONST is safe here since without may_free real is unchanged */ res1 = origin_subst_one(obj, __DECONST(char *, real), "$ORIGIN", NULL, false); res2 = origin_subst_one(NULL, res1, "$OSNAME", uts.sysname, true); res3 = origin_subst_one(NULL, res2, "$OSREL", uts.release, true); res4 = origin_subst_one(NULL, res3, "$PLATFORM", uts.machine, true); return (res4); } void rtld_die(void) { const char *msg = dlerror(); if (msg == NULL) msg = "Fatal error"; rtld_fdputstr(STDERR_FILENO, _BASENAME_RTLD ": "); rtld_fdputstr(STDERR_FILENO, msg); rtld_fdputchar(STDERR_FILENO, '\n'); _exit(1); } /* * Process a shared object's DYNAMIC section, and save the important * information in its Obj_Entry structure. */ static void digest_dynamic1(Obj_Entry *obj, int early, const Elf_Dyn **dyn_rpath, const Elf_Dyn **dyn_soname, const Elf_Dyn **dyn_runpath) { const Elf_Dyn *dynp; Needed_Entry **needed_tail = &obj->needed; Needed_Entry **needed_filtees_tail = &obj->needed_filtees; Needed_Entry **needed_aux_filtees_tail = &obj->needed_aux_filtees; const Elf_Hashelt *hashtab; const Elf32_Word *hashval; Elf32_Word bkt, nmaskwords; int bloom_size32; int plttype = DT_REL; *dyn_rpath = NULL; *dyn_soname = NULL; *dyn_runpath = NULL; obj->bind_now = false; for (dynp = obj->dynamic; dynp->d_tag != DT_NULL; dynp++) { switch (dynp->d_tag) { case DT_REL: obj->rel = (const Elf_Rel *)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_RELSZ: obj->relsize = dynp->d_un.d_val; break; case DT_RELENT: assert(dynp->d_un.d_val == sizeof(Elf_Rel)); break; case DT_JMPREL: obj->pltrel = (const Elf_Rel *) (obj->relocbase + dynp->d_un.d_ptr); break; case DT_PLTRELSZ: obj->pltrelsize = dynp->d_un.d_val; break; case DT_RELA: obj->rela = (const Elf_Rela *)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_RELASZ: obj->relasize = dynp->d_un.d_val; break; case DT_RELAENT: assert(dynp->d_un.d_val == sizeof(Elf_Rela)); break; case DT_PLTREL: plttype = dynp->d_un.d_val; assert(dynp->d_un.d_val == DT_REL || plttype == DT_RELA); break; case DT_SYMTAB: obj->symtab = (const Elf_Sym *) (obj->relocbase + dynp->d_un.d_ptr); break; case DT_SYMENT: assert(dynp->d_un.d_val == sizeof(Elf_Sym)); break; case DT_STRTAB: obj->strtab = (const char *)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_STRSZ: obj->strsize = dynp->d_un.d_val; break; case DT_VERNEED: obj->verneed = (const Elf_Verneed *)(obj->relocbase + dynp->d_un.d_val); break; case DT_VERNEEDNUM: obj->verneednum = dynp->d_un.d_val; break; case DT_VERDEF: obj->verdef = (const Elf_Verdef *)(obj->relocbase + dynp->d_un.d_val); break; case DT_VERDEFNUM: obj->verdefnum = dynp->d_un.d_val; break; case DT_VERSYM: obj->versyms = (const Elf_Versym *)(obj->relocbase + dynp->d_un.d_val); break; case DT_HASH: { hashtab = (const Elf_Hashelt *)(obj->relocbase + dynp->d_un.d_ptr); obj->nbuckets = hashtab[0]; obj->nchains = hashtab[1]; obj->buckets = hashtab + 2; obj->chains = obj->buckets + obj->nbuckets; obj->valid_hash_sysv = obj->nbuckets > 0 && obj->nchains > 0 && obj->buckets != NULL; } break; case DT_GNU_HASH: { hashtab = (const Elf_Hashelt *)(obj->relocbase + dynp->d_un.d_ptr); obj->nbuckets_gnu = hashtab[0]; obj->symndx_gnu = hashtab[1]; nmaskwords = hashtab[2]; bloom_size32 = (__ELF_WORD_SIZE / 32) * nmaskwords; obj->maskwords_bm_gnu = nmaskwords - 1; obj->shift2_gnu = hashtab[3]; obj->bloom_gnu = (const Elf_Addr *)(hashtab + 4); obj->buckets_gnu = hashtab + 4 + bloom_size32; obj->chain_zero_gnu = obj->buckets_gnu + obj->nbuckets_gnu - obj->symndx_gnu; /* Number of bitmask words is required to be power of 2 */ obj->valid_hash_gnu = powerof2(nmaskwords) && obj->nbuckets_gnu > 0 && obj->buckets_gnu != NULL; } break; case DT_NEEDED: if (!obj->rtld) { Needed_Entry *nep = NEW(Needed_Entry); nep->name = dynp->d_un.d_val; nep->obj = NULL; nep->next = NULL; *needed_tail = nep; needed_tail = &nep->next; } break; case DT_FILTER: if (!obj->rtld) { Needed_Entry *nep = NEW(Needed_Entry); nep->name = dynp->d_un.d_val; nep->obj = NULL; nep->next = NULL; *needed_filtees_tail = nep; needed_filtees_tail = &nep->next; } break; case DT_AUXILIARY: if (!obj->rtld) { Needed_Entry *nep = NEW(Needed_Entry); nep->name = dynp->d_un.d_val; nep->obj = NULL; nep->next = NULL; *needed_aux_filtees_tail = nep; needed_aux_filtees_tail = &nep->next; } break; case DT_PLTGOT: obj->pltgot = (Elf_Addr *)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_TEXTREL: obj->textrel = true; break; case DT_SYMBOLIC: obj->symbolic = true; break; case DT_RPATH: /* * We have to wait until later to process this, because we * might not have gotten the address of the string table yet. */ *dyn_rpath = dynp; break; case DT_SONAME: *dyn_soname = dynp; break; case DT_RUNPATH: *dyn_runpath = dynp; break; case DT_INIT: obj->init = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_PREINIT_ARRAY: obj->preinit_array = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_PREINIT_ARRAYSZ: obj->preinit_array_num = dynp->d_un.d_val / sizeof(Elf_Addr); break; case DT_INIT_ARRAY: obj->init_array = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_INIT_ARRAYSZ: obj->init_array_num = dynp->d_un.d_val / sizeof(Elf_Addr); break; case DT_FINI: obj->fini = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_FINI_ARRAY: obj->fini_array = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr); break; case DT_FINI_ARRAYSZ: obj->fini_array_num = dynp->d_un.d_val / sizeof(Elf_Addr); break; /* * Don't process DT_DEBUG on MIPS as the dynamic section * is mapped read-only. DT_MIPS_RLD_MAP is used instead. */ #ifndef __mips__ case DT_DEBUG: if (!early) dbg("Filling in DT_DEBUG entry"); (__DECONST(Elf_Dyn *, dynp))->d_un.d_ptr = (Elf_Addr)&r_debug; break; #endif case DT_FLAGS: if (dynp->d_un.d_val & DF_ORIGIN) obj->z_origin = true; if (dynp->d_un.d_val & DF_SYMBOLIC) obj->symbolic = true; if (dynp->d_un.d_val & DF_TEXTREL) obj->textrel = true; if (dynp->d_un.d_val & DF_BIND_NOW) obj->bind_now = true; if (dynp->d_un.d_val & DF_STATIC_TLS) obj->static_tls = true; break; #ifdef __mips__ case DT_MIPS_LOCAL_GOTNO: obj->local_gotno = dynp->d_un.d_val; break; case DT_MIPS_SYMTABNO: obj->symtabno = dynp->d_un.d_val; break; case DT_MIPS_GOTSYM: obj->gotsym = dynp->d_un.d_val; break; case DT_MIPS_RLD_MAP: *((Elf_Addr *)(dynp->d_un.d_ptr)) = (Elf_Addr) &r_debug; break; case DT_MIPS_RLD_MAP_REL: // The MIPS_RLD_MAP_REL tag stores the offset to the .rld_map // section relative to the address of the tag itself. *((Elf_Addr *)(__DECONST(char*, dynp) + dynp->d_un.d_val)) = (Elf_Addr) &r_debug; break; case DT_MIPS_PLTGOT: obj->mips_pltgot = (Elf_Addr *)(obj->relocbase + dynp->d_un.d_ptr); break; #endif #ifdef __powerpc__ #ifdef __powerpc64__ case DT_PPC64_GLINK: obj->glink = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr); break; #else case DT_PPC_GOT: obj->gotptr = (Elf_Addr *)(obj->relocbase + dynp->d_un.d_ptr); break; #endif #endif case DT_FLAGS_1: if (dynp->d_un.d_val & DF_1_NOOPEN) obj->z_noopen = true; if (dynp->d_un.d_val & DF_1_ORIGIN) obj->z_origin = true; if (dynp->d_un.d_val & DF_1_GLOBAL) obj->z_global = true; if (dynp->d_un.d_val & DF_1_BIND_NOW) obj->bind_now = true; if (dynp->d_un.d_val & DF_1_NODELETE) obj->z_nodelete = true; if (dynp->d_un.d_val & DF_1_LOADFLTR) obj->z_loadfltr = true; if (dynp->d_un.d_val & DF_1_INTERPOSE) obj->z_interpose = true; if (dynp->d_un.d_val & DF_1_NODEFLIB) obj->z_nodeflib = true; break; default: if (!early) { dbg("Ignoring d_tag %ld = %#lx", (long)dynp->d_tag, (long)dynp->d_tag); } break; } } obj->traced = false; if (plttype == DT_RELA) { obj->pltrela = (const Elf_Rela *) obj->pltrel; obj->pltrel = NULL; obj->pltrelasize = obj->pltrelsize; obj->pltrelsize = 0; } /* Determine size of dynsym table (equal to nchains of sysv hash) */ if (obj->valid_hash_sysv) obj->dynsymcount = obj->nchains; else if (obj->valid_hash_gnu) { obj->dynsymcount = 0; for (bkt = 0; bkt < obj->nbuckets_gnu; bkt++) { if (obj->buckets_gnu[bkt] == 0) continue; hashval = &obj->chain_zero_gnu[obj->buckets_gnu[bkt]]; do obj->dynsymcount++; while ((*hashval++ & 1u) == 0); } obj->dynsymcount += obj->symndx_gnu; } } static bool obj_resolve_origin(Obj_Entry *obj) { if (obj->origin_path != NULL) return (true); obj->origin_path = xmalloc(PATH_MAX); return (rtld_dirname_abs(obj->path, obj->origin_path) != -1); } static void digest_dynamic2(Obj_Entry *obj, const Elf_Dyn *dyn_rpath, const Elf_Dyn *dyn_soname, const Elf_Dyn *dyn_runpath) { if (obj->z_origin && !obj_resolve_origin(obj)) rtld_die(); if (dyn_runpath != NULL) { obj->runpath = (const char *)obj->strtab + dyn_runpath->d_un.d_val; obj->runpath = origin_subst(obj, obj->runpath); } else if (dyn_rpath != NULL) { obj->rpath = (const char *)obj->strtab + dyn_rpath->d_un.d_val; obj->rpath = origin_subst(obj, obj->rpath); } if (dyn_soname != NULL) object_add_name(obj, obj->strtab + dyn_soname->d_un.d_val); } static void digest_dynamic(Obj_Entry *obj, int early) { const Elf_Dyn *dyn_rpath; const Elf_Dyn *dyn_soname; const Elf_Dyn *dyn_runpath; digest_dynamic1(obj, early, &dyn_rpath, &dyn_soname, &dyn_runpath); digest_dynamic2(obj, dyn_rpath, dyn_soname, dyn_runpath); } /* * Process a shared object's program header. This is used only for the * main program, when the kernel has already loaded the main program * into memory before calling the dynamic linker. It creates and * returns an Obj_Entry structure. */ static Obj_Entry * digest_phdr(const Elf_Phdr *phdr, int phnum, caddr_t entry, const char *path) { Obj_Entry *obj; const Elf_Phdr *phlimit = phdr + phnum; const Elf_Phdr *ph; Elf_Addr note_start, note_end; int nsegs = 0; obj = obj_new(); for (ph = phdr; ph < phlimit; ph++) { if (ph->p_type != PT_PHDR) continue; obj->phdr = phdr; obj->phsize = ph->p_memsz; obj->relocbase = __DECONST(char *, phdr) - ph->p_vaddr; break; } obj->stack_flags = PF_X | PF_R | PF_W; for (ph = phdr; ph < phlimit; ph++) { switch (ph->p_type) { case PT_INTERP: obj->interp = (const char *)(ph->p_vaddr + obj->relocbase); break; case PT_LOAD: if (nsegs == 0) { /* First load segment */ obj->vaddrbase = trunc_page(ph->p_vaddr); obj->mapbase = obj->vaddrbase + obj->relocbase; } else { /* Last load segment */ obj->mapsize = round_page(ph->p_vaddr + ph->p_memsz) - obj->vaddrbase; } nsegs++; break; case PT_DYNAMIC: obj->dynamic = (const Elf_Dyn *)(ph->p_vaddr + obj->relocbase); break; case PT_TLS: obj->tlsindex = 1; obj->tlssize = ph->p_memsz; obj->tlsalign = ph->p_align; obj->tlsinitsize = ph->p_filesz; obj->tlsinit = (void*)(ph->p_vaddr + obj->relocbase); break; case PT_GNU_STACK: obj->stack_flags = ph->p_flags; break; case PT_GNU_RELRO: obj->relro_page = obj->relocbase + trunc_page(ph->p_vaddr); obj->relro_size = round_page(ph->p_memsz); break; case PT_NOTE: note_start = (Elf_Addr)obj->relocbase + ph->p_vaddr; note_end = note_start + ph->p_filesz; digest_notes(obj, note_start, note_end); break; } } if (nsegs < 1) { _rtld_error("%s: too few PT_LOAD segments", path); return NULL; } obj->entry = entry; return obj; } void digest_notes(Obj_Entry *obj, Elf_Addr note_start, Elf_Addr note_end) { const Elf_Note *note; const char *note_name; uintptr_t p; for (note = (const Elf_Note *)note_start; (Elf_Addr)note < note_end; note = (const Elf_Note *)((const char *)(note + 1) + roundup2(note->n_namesz, sizeof(Elf32_Addr)) + roundup2(note->n_descsz, sizeof(Elf32_Addr)))) { if (note->n_namesz != sizeof(NOTE_FREEBSD_VENDOR) || note->n_descsz != sizeof(int32_t)) continue; if (note->n_type != NT_FREEBSD_ABI_TAG && note->n_type != NT_FREEBSD_FEATURE_CTL && note->n_type != NT_FREEBSD_NOINIT_TAG) continue; note_name = (const char *)(note + 1); if (strncmp(NOTE_FREEBSD_VENDOR, note_name, sizeof(NOTE_FREEBSD_VENDOR)) != 0) continue; switch (note->n_type) { case NT_FREEBSD_ABI_TAG: /* FreeBSD osrel note */ p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); obj->osrel = *(const int32_t *)(p); dbg("note osrel %d", obj->osrel); break; case NT_FREEBSD_FEATURE_CTL: /* FreeBSD ABI feature control note */ p = (uintptr_t)(note + 1); p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); obj->fctl0 = *(const uint32_t *)(p); dbg("note fctl0 %#x", obj->fctl0); break; case NT_FREEBSD_NOINIT_TAG: /* FreeBSD 'crt does not call init' note */ obj->crt_no_init = true; dbg("note crt_no_init"); break; } } } static Obj_Entry * dlcheck(void *handle) { Obj_Entry *obj; TAILQ_FOREACH(obj, &obj_list, next) { if (obj == (Obj_Entry *) handle) break; } if (obj == NULL || obj->refcount == 0 || obj->dl_refcount == 0) { _rtld_error("Invalid shared object handle %p", handle); return NULL; } return obj; } /* * If the given object is already in the donelist, return true. Otherwise * add the object to the list and return false. */ static bool donelist_check(DoneList *dlp, const Obj_Entry *obj) { unsigned int i; for (i = 0; i < dlp->num_used; i++) if (dlp->objs[i] == obj) return true; /* * Our donelist allocation should always be sufficient. But if * our threads locking isn't working properly, more shared objects * could have been loaded since we allocated the list. That should * never happen, but we'll handle it properly just in case it does. */ if (dlp->num_used < dlp->num_alloc) dlp->objs[dlp->num_used++] = obj; return false; } /* * Hash function for symbol table lookup. Don't even think about changing * this. It is specified by the System V ABI. */ unsigned long elf_hash(const char *name) { const unsigned char *p = (const unsigned char *) name; unsigned long h = 0; unsigned long g; while (*p != '\0') { h = (h << 4) + *p++; if ((g = h & 0xf0000000) != 0) h ^= g >> 24; h &= ~g; } return h; } /* * The GNU hash function is the Daniel J. Bernstein hash clipped to 32 bits * unsigned in case it's implemented with a wider type. */ static uint32_t gnu_hash(const char *s) { uint32_t h; unsigned char c; h = 5381; for (c = *s; c != '\0'; c = *++s) h = h * 33 + c; return (h & 0xffffffff); } /* * Find the library with the given name, and return its full pathname. * The returned string is dynamically allocated. Generates an error * message and returns NULL if the library cannot be found. * * If the second argument is non-NULL, then it refers to an already- * loaded shared object, whose library search path will be searched. * * If a library is successfully located via LD_LIBRARY_PATH_FDS, its * descriptor (which is close-on-exec) will be passed out via the third * argument. * * The search order is: * DT_RPATH in the referencing file _unless_ DT_RUNPATH is present (1) * DT_RPATH of the main object if DSO without defined DT_RUNPATH (1) * LD_LIBRARY_PATH * DT_RUNPATH in the referencing file * ldconfig hints (if -z nodefaultlib, filter out default library directories * from list) * /lib:/usr/lib _unless_ the referencing file is linked with -z nodefaultlib * * (1) Handled in digest_dynamic2 - rpath left NULL if runpath defined. */ static char * find_library(const char *xname, const Obj_Entry *refobj, int *fdp) { char *pathname, *refobj_path; const char *name; bool nodeflib, objgiven; objgiven = refobj != NULL; if (libmap_disable || !objgiven || (name = lm_find(refobj->path, xname)) == NULL) name = xname; if (strchr(name, '/') != NULL) { /* Hard coded pathname */ if (name[0] != '/' && !trust) { _rtld_error("Absolute pathname required " "for shared object \"%s\"", name); return (NULL); } return (origin_subst(__DECONST(Obj_Entry *, refobj), __DECONST(char *, name))); } dbg(" Searching for \"%s\"", name); refobj_path = objgiven ? refobj->path : NULL; /* * If refobj->rpath != NULL, then refobj->runpath is NULL. Fall * back to pre-conforming behaviour if user requested so with * LD_LIBRARY_PATH_RPATH environment variable and ignore -z * nodeflib. */ if (objgiven && refobj->rpath != NULL && ld_library_path_rpath) { pathname = search_library_path(name, ld_library_path, refobj_path, fdp); if (pathname != NULL) return (pathname); if (refobj != NULL) { pathname = search_library_path(name, refobj->rpath, refobj_path, fdp); if (pathname != NULL) return (pathname); } pathname = search_library_pathfds(name, ld_library_dirs, fdp); if (pathname != NULL) return (pathname); pathname = search_library_path(name, gethints(false), refobj_path, fdp); if (pathname != NULL) return (pathname); pathname = search_library_path(name, ld_standard_library_path, refobj_path, fdp); if (pathname != NULL) return (pathname); } else { nodeflib = objgiven ? refobj->z_nodeflib : false; if (objgiven) { pathname = search_library_path(name, refobj->rpath, refobj->path, fdp); if (pathname != NULL) return (pathname); } if (objgiven && refobj->runpath == NULL && refobj != obj_main) { pathname = search_library_path(name, obj_main->rpath, refobj_path, fdp); if (pathname != NULL) return (pathname); } pathname = search_library_path(name, ld_library_path, refobj_path, fdp); if (pathname != NULL) return (pathname); if (objgiven) { pathname = search_library_path(name, refobj->runpath, refobj_path, fdp); if (pathname != NULL) return (pathname); } pathname = search_library_pathfds(name, ld_library_dirs, fdp); if (pathname != NULL) return (pathname); pathname = search_library_path(name, gethints(nodeflib), refobj_path, fdp); if (pathname != NULL) return (pathname); if (objgiven && !nodeflib) { pathname = search_library_path(name, ld_standard_library_path, refobj_path, fdp); if (pathname != NULL) return (pathname); } } if (objgiven && refobj->path != NULL) { _rtld_error("Shared object \"%s\" not found, " "required by \"%s\"", name, basename(refobj->path)); } else { _rtld_error("Shared object \"%s\" not found", name); } return (NULL); } /* * Given a symbol number in a referencing object, find the corresponding * definition of the symbol. Returns a pointer to the symbol, or NULL if * no definition was found. Returns a pointer to the Obj_Entry of the * defining object via the reference parameter DEFOBJ_OUT. */ const Elf_Sym * find_symdef(unsigned long symnum, const Obj_Entry *refobj, const Obj_Entry **defobj_out, int flags, SymCache *cache, RtldLockState *lockstate) { const Elf_Sym *ref; const Elf_Sym *def; const Obj_Entry *defobj; const Ver_Entry *ve; SymLook req; const char *name; int res; /* * If we have already found this symbol, get the information from * the cache. */ if (symnum >= refobj->dynsymcount) return NULL; /* Bad object */ if (cache != NULL && cache[symnum].sym != NULL) { *defobj_out = cache[symnum].obj; return cache[symnum].sym; } ref = refobj->symtab + symnum; name = refobj->strtab + ref->st_name; def = NULL; defobj = NULL; ve = NULL; /* * We don't have to do a full scale lookup if the symbol is local. * We know it will bind to the instance in this load module; to * which we already have a pointer (ie ref). By not doing a lookup, * we not only improve performance, but it also avoids unresolvable * symbols when local symbols are not in the hash table. This has * been seen with the ia64 toolchain. */ if (ELF_ST_BIND(ref->st_info) != STB_LOCAL) { if (ELF_ST_TYPE(ref->st_info) == STT_SECTION) { _rtld_error("%s: Bogus symbol table entry %lu", refobj->path, symnum); } symlook_init(&req, name); req.flags = flags; ve = req.ventry = fetch_ventry(refobj, symnum); req.lockstate = lockstate; res = symlook_default(&req, refobj); if (res == 0) { def = req.sym_out; defobj = req.defobj_out; } } else { def = ref; defobj = refobj; } /* * If we found no definition and the reference is weak, treat the * symbol as having the value zero. */ if (def == NULL && ELF_ST_BIND(ref->st_info) == STB_WEAK) { def = &sym_zero; defobj = obj_main; } if (def != NULL) { *defobj_out = defobj; /* Record the information in the cache to avoid subsequent lookups. */ if (cache != NULL) { cache[symnum].sym = def; cache[symnum].obj = defobj; } } else { if (refobj != &obj_rtld) _rtld_error("%s: Undefined symbol \"%s%s%s\"", refobj->path, name, ve != NULL ? "@" : "", ve != NULL ? ve->name : ""); } return def; } /* * Return the search path from the ldconfig hints file, reading it if * necessary. If nostdlib is true, then the default search paths are * not added to result. * * Returns NULL if there are problems with the hints file, * or if the search path there is empty. */ static const char * gethints(bool nostdlib) { static char *filtered_path; static const char *hints; static struct elfhints_hdr hdr; struct fill_search_info_args sargs, hargs; struct dl_serinfo smeta, hmeta, *SLPinfo, *hintinfo; struct dl_serpath *SLPpath, *hintpath; char *p; struct stat hint_stat; unsigned int SLPndx, hintndx, fndx, fcount; int fd; size_t flen; uint32_t dl; bool skip; /* First call, read the hints file */ if (hints == NULL) { /* Keep from trying again in case the hints file is bad. */ hints = ""; if ((fd = open(ld_elf_hints_path, O_RDONLY | O_CLOEXEC)) == -1) return (NULL); /* * Check of hdr.dirlistlen value against type limit * intends to pacify static analyzers. Further * paranoia leads to checks that dirlist is fully * contained in the file range. */ if (read(fd, &hdr, sizeof hdr) != sizeof hdr || hdr.magic != ELFHINTS_MAGIC || hdr.version != 1 || hdr.dirlistlen > UINT_MAX / 2 || fstat(fd, &hint_stat) == -1) { cleanup1: close(fd); hdr.dirlistlen = 0; return (NULL); } dl = hdr.strtab; if (dl + hdr.dirlist < dl) goto cleanup1; dl += hdr.dirlist; if (dl + hdr.dirlistlen < dl) goto cleanup1; dl += hdr.dirlistlen; if (dl > hint_stat.st_size) goto cleanup1; p = xmalloc(hdr.dirlistlen + 1); if (pread(fd, p, hdr.dirlistlen + 1, hdr.strtab + hdr.dirlist) != (ssize_t)hdr.dirlistlen + 1 || p[hdr.dirlistlen] != '\0') { free(p); goto cleanup1; } hints = p; close(fd); } /* * If caller agreed to receive list which includes the default * paths, we are done. Otherwise, if we still did not * calculated filtered result, do it now. */ if (!nostdlib) return (hints[0] != '\0' ? hints : NULL); if (filtered_path != NULL) goto filt_ret; /* * Obtain the list of all configured search paths, and the * list of the default paths. * * First estimate the size of the results. */ smeta.dls_size = __offsetof(struct dl_serinfo, dls_serpath); smeta.dls_cnt = 0; hmeta.dls_size = __offsetof(struct dl_serinfo, dls_serpath); hmeta.dls_cnt = 0; sargs.request = RTLD_DI_SERINFOSIZE; sargs.serinfo = &smeta; hargs.request = RTLD_DI_SERINFOSIZE; hargs.serinfo = &hmeta; path_enumerate(ld_standard_library_path, fill_search_info, NULL, &sargs); path_enumerate(hints, fill_search_info, NULL, &hargs); SLPinfo = xmalloc(smeta.dls_size); hintinfo = xmalloc(hmeta.dls_size); /* * Next fetch both sets of paths. */ sargs.request = RTLD_DI_SERINFO; sargs.serinfo = SLPinfo; sargs.serpath = &SLPinfo->dls_serpath[0]; sargs.strspace = (char *)&SLPinfo->dls_serpath[smeta.dls_cnt]; hargs.request = RTLD_DI_SERINFO; hargs.serinfo = hintinfo; hargs.serpath = &hintinfo->dls_serpath[0]; hargs.strspace = (char *)&hintinfo->dls_serpath[hmeta.dls_cnt]; path_enumerate(ld_standard_library_path, fill_search_info, NULL, &sargs); path_enumerate(hints, fill_search_info, NULL, &hargs); /* * Now calculate the difference between two sets, by excluding * standard paths from the full set. */ fndx = 0; fcount = 0; filtered_path = xmalloc(hdr.dirlistlen + 1); hintpath = &hintinfo->dls_serpath[0]; for (hintndx = 0; hintndx < hmeta.dls_cnt; hintndx++, hintpath++) { skip = false; SLPpath = &SLPinfo->dls_serpath[0]; /* * Check each standard path against current. */ for (SLPndx = 0; SLPndx < smeta.dls_cnt; SLPndx++, SLPpath++) { /* matched, skip the path */ if (!strcmp(hintpath->dls_name, SLPpath->dls_name)) { skip = true; break; } } if (skip) continue; /* * Not matched against any standard path, add the path * to result. Separate consequtive paths with ':'. */ if (fcount > 0) { filtered_path[fndx] = ':'; fndx++; } fcount++; flen = strlen(hintpath->dls_name); strncpy((filtered_path + fndx), hintpath->dls_name, flen); fndx += flen; } filtered_path[fndx] = '\0'; free(SLPinfo); free(hintinfo); filt_ret: return (filtered_path[0] != '\0' ? filtered_path : NULL); } static void init_dag(Obj_Entry *root) { const Needed_Entry *needed; const Objlist_Entry *elm; DoneList donelist; if (root->dag_inited) return; donelist_init(&donelist); /* Root object belongs to own DAG. */ objlist_push_tail(&root->dldags, root); objlist_push_tail(&root->dagmembers, root); donelist_check(&donelist, root); /* * Add dependencies of root object to DAG in breadth order * by exploiting the fact that each new object get added * to the tail of the dagmembers list. */ STAILQ_FOREACH(elm, &root->dagmembers, link) { for (needed = elm->obj->needed; needed != NULL; needed = needed->next) { if (needed->obj == NULL || donelist_check(&donelist, needed->obj)) continue; objlist_push_tail(&needed->obj->dldags, root); objlist_push_tail(&root->dagmembers, needed->obj); } } root->dag_inited = true; } static void init_marker(Obj_Entry *marker) { bzero(marker, sizeof(*marker)); marker->marker = true; } Obj_Entry * globallist_curr(const Obj_Entry *obj) { for (;;) { if (obj == NULL) return (NULL); if (!obj->marker) return (__DECONST(Obj_Entry *, obj)); obj = TAILQ_PREV(obj, obj_entry_q, next); } } Obj_Entry * globallist_next(const Obj_Entry *obj) { for (;;) { obj = TAILQ_NEXT(obj, next); if (obj == NULL) return (NULL); if (!obj->marker) return (__DECONST(Obj_Entry *, obj)); } } /* Prevent the object from being unmapped while the bind lock is dropped. */ static void hold_object(Obj_Entry *obj) { obj->holdcount++; } static void unhold_object(Obj_Entry *obj) { assert(obj->holdcount > 0); if (--obj->holdcount == 0 && obj->unholdfree) release_object(obj); } static void process_z(Obj_Entry *root) { const Objlist_Entry *elm; Obj_Entry *obj; /* * Walk over object DAG and process every dependent object * that is marked as DF_1_NODELETE or DF_1_GLOBAL. They need * to grow their own DAG. * * For DF_1_GLOBAL, DAG is required for symbol lookups in * symlook_global() to work. * * For DF_1_NODELETE, the DAG should have its reference upped. */ STAILQ_FOREACH(elm, &root->dagmembers, link) { obj = elm->obj; if (obj == NULL) continue; if (obj->z_nodelete && !obj->ref_nodel) { dbg("obj %s -z nodelete", obj->path); init_dag(obj); ref_dag(obj); obj->ref_nodel = true; } if (obj->z_global && objlist_find(&list_global, obj) == NULL) { dbg("obj %s -z global", obj->path); objlist_push_tail(&list_global, obj); init_dag(obj); } } } /* * Initialize the dynamic linker. The argument is the address at which * the dynamic linker has been mapped into memory. The primary task of * this function is to relocate the dynamic linker. */ static void init_rtld(caddr_t mapbase, Elf_Auxinfo **aux_info) { Obj_Entry objtmp; /* Temporary rtld object */ const Elf_Ehdr *ehdr; const Elf_Dyn *dyn_rpath; const Elf_Dyn *dyn_soname; const Elf_Dyn *dyn_runpath; #ifdef RTLD_INIT_PAGESIZES_EARLY /* The page size is required by the dynamic memory allocator. */ init_pagesizes(aux_info); #endif /* * Conjure up an Obj_Entry structure for the dynamic linker. * * The "path" member can't be initialized yet because string constants * cannot yet be accessed. Below we will set it correctly. */ memset(&objtmp, 0, sizeof(objtmp)); objtmp.path = NULL; objtmp.rtld = true; objtmp.mapbase = mapbase; #ifdef PIC objtmp.relocbase = mapbase; #endif objtmp.dynamic = rtld_dynamic(&objtmp); digest_dynamic1(&objtmp, 1, &dyn_rpath, &dyn_soname, &dyn_runpath); assert(objtmp.needed == NULL); #if !defined(__mips__) /* MIPS has a bogus DT_TEXTREL. */ assert(!objtmp.textrel); #endif /* * Temporarily put the dynamic linker entry into the object list, so * that symbols can be found. */ relocate_objects(&objtmp, true, &objtmp, 0, NULL); ehdr = (Elf_Ehdr *)mapbase; objtmp.phdr = (Elf_Phdr *)((char *)mapbase + ehdr->e_phoff); objtmp.phsize = ehdr->e_phnum * sizeof(objtmp.phdr[0]); /* Initialize the object list. */ TAILQ_INIT(&obj_list); /* Now that non-local variables can be accesses, copy out obj_rtld. */ memcpy(&obj_rtld, &objtmp, sizeof(obj_rtld)); #ifndef RTLD_INIT_PAGESIZES_EARLY /* The page size is required by the dynamic memory allocator. */ init_pagesizes(aux_info); #endif if (aux_info[AT_OSRELDATE] != NULL) osreldate = aux_info[AT_OSRELDATE]->a_un.a_val; digest_dynamic2(&obj_rtld, dyn_rpath, dyn_soname, dyn_runpath); /* Replace the path with a dynamically allocated copy. */ obj_rtld.path = xstrdup(ld_path_rtld); r_debug.r_brk = r_debug_state; r_debug.r_state = RT_CONSISTENT; } /* * Retrieve the array of supported page sizes. The kernel provides the page * sizes in increasing order. */ static void init_pagesizes(Elf_Auxinfo **aux_info) { static size_t psa[MAXPAGESIZES]; int mib[2]; size_t len, size; if (aux_info[AT_PAGESIZES] != NULL && aux_info[AT_PAGESIZESLEN] != NULL) { size = aux_info[AT_PAGESIZESLEN]->a_un.a_val; pagesizes = aux_info[AT_PAGESIZES]->a_un.a_ptr; } else { len = 2; if (sysctlnametomib("hw.pagesizes", mib, &len) == 0) size = sizeof(psa); else { /* As a fallback, retrieve the base page size. */ size = sizeof(psa[0]); if (aux_info[AT_PAGESZ] != NULL) { psa[0] = aux_info[AT_PAGESZ]->a_un.a_val; goto psa_filled; } else { mib[0] = CTL_HW; mib[1] = HW_PAGESIZE; len = 2; } } if (sysctl(mib, len, psa, &size, NULL, 0) == -1) { _rtld_error("sysctl for hw.pagesize(s) failed"); rtld_die(); } psa_filled: pagesizes = psa; } npagesizes = size / sizeof(pagesizes[0]); /* Discard any invalid entries at the end of the array. */ while (npagesizes > 0 && pagesizes[npagesizes - 1] == 0) npagesizes--; } /* * Add the init functions from a needed object list (and its recursive * needed objects) to "list". This is not used directly; it is a helper * function for initlist_add_objects(). The write lock must be held * when this function is called. */ static void initlist_add_neededs(Needed_Entry *needed, Objlist *list) { /* Recursively process the successor needed objects. */ if (needed->next != NULL) initlist_add_neededs(needed->next, list); /* Process the current needed object. */ if (needed->obj != NULL) initlist_add_objects(needed->obj, needed->obj, list); } /* * Scan all of the DAGs rooted in the range of objects from "obj" to * "tail" and add their init functions to "list". This recurses over * the DAGs and ensure the proper init ordering such that each object's * needed libraries are initialized before the object itself. At the * same time, this function adds the objects to the global finalization * list "list_fini" in the opposite order. The write lock must be * held when this function is called. */ static void initlist_add_objects(Obj_Entry *obj, Obj_Entry *tail, Objlist *list) { Obj_Entry *nobj; if (obj->init_scanned || obj->init_done) return; obj->init_scanned = true; /* Recursively process the successor objects. */ nobj = globallist_next(obj); if (nobj != NULL && obj != tail) initlist_add_objects(nobj, tail, list); /* Recursively process the needed objects. */ if (obj->needed != NULL) initlist_add_neededs(obj->needed, list); if (obj->needed_filtees != NULL) initlist_add_neededs(obj->needed_filtees, list); if (obj->needed_aux_filtees != NULL) initlist_add_neededs(obj->needed_aux_filtees, list); /* Add the object to the init list. */ objlist_push_tail(list, obj); /* Add the object to the global fini list in the reverse order. */ if ((obj->fini != (Elf_Addr)NULL || obj->fini_array != (Elf_Addr)NULL) && !obj->on_fini_list) { objlist_push_head(&list_fini, obj); obj->on_fini_list = true; } } #ifndef FPTR_TARGET #define FPTR_TARGET(f) ((Elf_Addr) (f)) #endif static void free_needed_filtees(Needed_Entry *n, RtldLockState *lockstate) { Needed_Entry *needed, *needed1; for (needed = n; needed != NULL; needed = needed->next) { if (needed->obj != NULL) { dlclose_locked(needed->obj, lockstate); needed->obj = NULL; } } for (needed = n; needed != NULL; needed = needed1) { needed1 = needed->next; free(needed); } } static void unload_filtees(Obj_Entry *obj, RtldLockState *lockstate) { free_needed_filtees(obj->needed_filtees, lockstate); obj->needed_filtees = NULL; free_needed_filtees(obj->needed_aux_filtees, lockstate); obj->needed_aux_filtees = NULL; obj->filtees_loaded = false; } static void load_filtee1(Obj_Entry *obj, Needed_Entry *needed, int flags, RtldLockState *lockstate) { for (; needed != NULL; needed = needed->next) { needed->obj = dlopen_object(obj->strtab + needed->name, -1, obj, flags, ((ld_loadfltr || obj->z_loadfltr) ? RTLD_NOW : RTLD_LAZY) | RTLD_LOCAL, lockstate); } } static void load_filtees(Obj_Entry *obj, int flags, RtldLockState *lockstate) { lock_restart_for_upgrade(lockstate); if (!obj->filtees_loaded) { load_filtee1(obj, obj->needed_filtees, flags, lockstate); load_filtee1(obj, obj->needed_aux_filtees, flags, lockstate); obj->filtees_loaded = true; } } static int process_needed(Obj_Entry *obj, Needed_Entry *needed, int flags) { Obj_Entry *obj1; for (; needed != NULL; needed = needed->next) { obj1 = needed->obj = load_object(obj->strtab + needed->name, -1, obj, flags & ~RTLD_LO_NOLOAD); if (obj1 == NULL && !ld_tracing && (flags & RTLD_LO_FILTEES) == 0) return (-1); } return (0); } /* * Given a shared object, traverse its list of needed objects, and load * each of them. Returns 0 on success. Generates an error message and * returns -1 on failure. */ static int load_needed_objects(Obj_Entry *first, int flags) { Obj_Entry *obj; for (obj = first; obj != NULL; obj = TAILQ_NEXT(obj, next)) { if (obj->marker) continue; if (process_needed(obj, obj->needed, flags) == -1) return (-1); } return (0); } static int load_preload_objects(void) { char *p = ld_preload; Obj_Entry *obj; static const char delim[] = " \t:;"; if (p == NULL) return 0; p += strspn(p, delim); while (*p != '\0') { size_t len = strcspn(p, delim); char savech; savech = p[len]; p[len] = '\0'; obj = load_object(p, -1, NULL, 0); if (obj == NULL) return -1; /* XXX - cleanup */ obj->z_interpose = true; p[len] = savech; p += len; p += strspn(p, delim); } LD_UTRACE(UTRACE_PRELOAD_FINISHED, NULL, NULL, 0, 0, NULL); return 0; } static const char * printable_path(const char *path) { return (path == NULL ? "" : path); } /* * Load a shared object into memory, if it is not already loaded. The * object may be specified by name or by user-supplied file descriptor * fd_u. In the later case, the fd_u descriptor is not closed, but its * duplicate is. * * Returns a pointer to the Obj_Entry for the object. Returns NULL * on failure. */ static Obj_Entry * load_object(const char *name, int fd_u, const Obj_Entry *refobj, int flags) { Obj_Entry *obj; int fd; struct stat sb; char *path; fd = -1; if (name != NULL) { TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker || obj->doomed) continue; if (object_match_name(obj, name)) return (obj); } path = find_library(name, refobj, &fd); if (path == NULL) return (NULL); } else path = NULL; if (fd >= 0) { /* * search_library_pathfds() opens a fresh file descriptor for the * library, so there is no need to dup(). */ } else if (fd_u == -1) { /* * If we didn't find a match by pathname, or the name is not * supplied, open the file and check again by device and inode. * This avoids false mismatches caused by multiple links or ".." * in pathnames. * * To avoid a race, we open the file and use fstat() rather than * using stat(). */ if ((fd = open(path, O_RDONLY | O_CLOEXEC | O_VERIFY)) == -1) { _rtld_error("Cannot open \"%s\"", path); free(path); return (NULL); } } else { fd = fcntl(fd_u, F_DUPFD_CLOEXEC, 0); if (fd == -1) { _rtld_error("Cannot dup fd"); free(path); return (NULL); } } if (fstat(fd, &sb) == -1) { _rtld_error("Cannot fstat \"%s\"", printable_path(path)); close(fd); free(path); return NULL; } TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker || obj->doomed) continue; if (obj->ino == sb.st_ino && obj->dev == sb.st_dev) break; } if (obj != NULL && name != NULL) { object_add_name(obj, name); free(path); close(fd); return obj; } if (flags & RTLD_LO_NOLOAD) { free(path); close(fd); return (NULL); } /* First use of this object, so we must map it in */ obj = do_load_object(fd, name, path, &sb, flags); if (obj == NULL) free(path); close(fd); return obj; } static Obj_Entry * do_load_object(int fd, const char *name, char *path, struct stat *sbp, int flags) { Obj_Entry *obj; struct statfs fs; /* * but first, make sure that environment variables haven't been * used to circumvent the noexec flag on a filesystem. */ if (dangerous_ld_env) { if (fstatfs(fd, &fs) != 0) { _rtld_error("Cannot fstatfs \"%s\"", printable_path(path)); return NULL; } if (fs.f_flags & MNT_NOEXEC) { _rtld_error("Cannot execute objects on %s", fs.f_mntonname); return NULL; } } dbg("loading \"%s\"", printable_path(path)); obj = map_object(fd, printable_path(path), sbp); if (obj == NULL) return NULL; /* * If DT_SONAME is present in the object, digest_dynamic2 already * added it to the object names. */ if (name != NULL) object_add_name(obj, name); obj->path = path; digest_dynamic(obj, 0); dbg("%s valid_hash_sysv %d valid_hash_gnu %d dynsymcount %d", obj->path, obj->valid_hash_sysv, obj->valid_hash_gnu, obj->dynsymcount); if (obj->z_noopen && (flags & (RTLD_LO_DLOPEN | RTLD_LO_TRACE)) == RTLD_LO_DLOPEN) { dbg("refusing to load non-loadable \"%s\"", obj->path); _rtld_error("Cannot dlopen non-loadable %s", obj->path); munmap(obj->mapbase, obj->mapsize); obj_free(obj); return (NULL); } obj->dlopened = (flags & RTLD_LO_DLOPEN) != 0; TAILQ_INSERT_TAIL(&obj_list, obj, next); obj_count++; obj_loads++; linkmap_add(obj); /* for GDB & dlinfo() */ max_stack_flags |= obj->stack_flags; dbg(" %p .. %p: %s", obj->mapbase, obj->mapbase + obj->mapsize - 1, obj->path); if (obj->textrel) dbg(" WARNING: %s has impure text", obj->path); LD_UTRACE(UTRACE_LOAD_OBJECT, obj, obj->mapbase, obj->mapsize, 0, obj->path); return obj; } static Obj_Entry * obj_from_addr(const void *addr) { Obj_Entry *obj; TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker) continue; if (addr < (void *) obj->mapbase) continue; if (addr < (void *)(obj->mapbase + obj->mapsize)) return obj; } return NULL; } static void preinit_main(void) { Elf_Addr *preinit_addr; int index; preinit_addr = (Elf_Addr *)obj_main->preinit_array; if (preinit_addr == NULL) return; for (index = 0; index < obj_main->preinit_array_num; index++) { if (preinit_addr[index] != 0 && preinit_addr[index] != 1) { dbg("calling preinit function for %s at %p", obj_main->path, (void *)preinit_addr[index]); LD_UTRACE(UTRACE_INIT_CALL, obj_main, (void *)preinit_addr[index], 0, 0, obj_main->path); call_init_pointer(obj_main, preinit_addr[index]); } } } /* * Call the finalization functions for each of the objects in "list" * belonging to the DAG of "root" and referenced once. If NULL "root" * is specified, every finalization function will be called regardless * of the reference count and the list elements won't be freed. All of * the objects are expected to have non-NULL fini functions. */ static void objlist_call_fini(Objlist *list, Obj_Entry *root, RtldLockState *lockstate) { Objlist_Entry *elm; char *saved_msg; Elf_Addr *fini_addr; int index; assert(root == NULL || root->refcount == 1); if (root != NULL) root->doomed = true; /* * Preserve the current error message since a fini function might * call into the dynamic linker and overwrite it. */ saved_msg = errmsg_save(); do { STAILQ_FOREACH(elm, list, link) { if (root != NULL && (elm->obj->refcount != 1 || objlist_find(&root->dagmembers, elm->obj) == NULL)) continue; /* Remove object from fini list to prevent recursive invocation. */ STAILQ_REMOVE(list, elm, Struct_Objlist_Entry, link); /* Ensure that new references cannot be acquired. */ elm->obj->doomed = true; hold_object(elm->obj); lock_release(rtld_bind_lock, lockstate); /* * It is legal to have both DT_FINI and DT_FINI_ARRAY defined. * When this happens, DT_FINI_ARRAY is processed first. */ fini_addr = (Elf_Addr *)elm->obj->fini_array; if (fini_addr != NULL && elm->obj->fini_array_num > 0) { for (index = elm->obj->fini_array_num - 1; index >= 0; index--) { if (fini_addr[index] != 0 && fini_addr[index] != 1) { dbg("calling fini function for %s at %p", elm->obj->path, (void *)fini_addr[index]); LD_UTRACE(UTRACE_FINI_CALL, elm->obj, (void *)fini_addr[index], 0, 0, elm->obj->path); call_initfini_pointer(elm->obj, fini_addr[index]); } } } if (elm->obj->fini != (Elf_Addr)NULL) { dbg("calling fini function for %s at %p", elm->obj->path, (void *)elm->obj->fini); LD_UTRACE(UTRACE_FINI_CALL, elm->obj, (void *)elm->obj->fini, 0, 0, elm->obj->path); call_initfini_pointer(elm->obj, elm->obj->fini); } wlock_acquire(rtld_bind_lock, lockstate); unhold_object(elm->obj); /* No need to free anything if process is going down. */ if (root != NULL) free(elm); /* * We must restart the list traversal after every fini call * because a dlclose() call from the fini function or from * another thread might have modified the reference counts. */ break; } } while (elm != NULL); errmsg_restore(saved_msg); } /* * Call the initialization functions for each of the objects in * "list". All of the objects are expected to have non-NULL init * functions. */ static void objlist_call_init(Objlist *list, RtldLockState *lockstate) { Objlist_Entry *elm; Obj_Entry *obj; char *saved_msg; Elf_Addr *init_addr; void (*reg)(void (*)(void)); int index; /* * Clean init_scanned flag so that objects can be rechecked and * possibly initialized earlier if any of vectors called below * cause the change by using dlopen. */ TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker) continue; obj->init_scanned = false; } /* * Preserve the current error message since an init function might * call into the dynamic linker and overwrite it. */ saved_msg = errmsg_save(); STAILQ_FOREACH(elm, list, link) { if (elm->obj->init_done) /* Initialized early. */ continue; /* * Race: other thread might try to use this object before current * one completes the initialization. Not much can be done here * without better locking. */ elm->obj->init_done = true; hold_object(elm->obj); reg = NULL; if (elm->obj == obj_main && obj_main->crt_no_init) { reg = (void (*)(void (*)(void)))get_program_var_addr( "__libc_atexit", lockstate); } lock_release(rtld_bind_lock, lockstate); if (reg != NULL) { reg(rtld_exit); rtld_exit_ptr = rtld_nop_exit; } /* * It is legal to have both DT_INIT and DT_INIT_ARRAY defined. * When this happens, DT_INIT is processed first. */ if (elm->obj->init != (Elf_Addr)NULL) { dbg("calling init function for %s at %p", elm->obj->path, (void *)elm->obj->init); LD_UTRACE(UTRACE_INIT_CALL, elm->obj, (void *)elm->obj->init, 0, 0, elm->obj->path); call_initfini_pointer(elm->obj, elm->obj->init); } init_addr = (Elf_Addr *)elm->obj->init_array; if (init_addr != NULL) { for (index = 0; index < elm->obj->init_array_num; index++) { if (init_addr[index] != 0 && init_addr[index] != 1) { dbg("calling init function for %s at %p", elm->obj->path, (void *)init_addr[index]); LD_UTRACE(UTRACE_INIT_CALL, elm->obj, (void *)init_addr[index], 0, 0, elm->obj->path); call_init_pointer(elm->obj, init_addr[index]); } } } wlock_acquire(rtld_bind_lock, lockstate); unhold_object(elm->obj); } errmsg_restore(saved_msg); } static void objlist_clear(Objlist *list) { Objlist_Entry *elm; while (!STAILQ_EMPTY(list)) { elm = STAILQ_FIRST(list); STAILQ_REMOVE_HEAD(list, link); free(elm); } } static Objlist_Entry * objlist_find(Objlist *list, const Obj_Entry *obj) { Objlist_Entry *elm; STAILQ_FOREACH(elm, list, link) if (elm->obj == obj) return elm; return NULL; } static void objlist_init(Objlist *list) { STAILQ_INIT(list); } static void objlist_push_head(Objlist *list, Obj_Entry *obj) { Objlist_Entry *elm; elm = NEW(Objlist_Entry); elm->obj = obj; STAILQ_INSERT_HEAD(list, elm, link); } static void objlist_push_tail(Objlist *list, Obj_Entry *obj) { Objlist_Entry *elm; elm = NEW(Objlist_Entry); elm->obj = obj; STAILQ_INSERT_TAIL(list, elm, link); } static void objlist_put_after(Objlist *list, Obj_Entry *listobj, Obj_Entry *obj) { Objlist_Entry *elm, *listelm; STAILQ_FOREACH(listelm, list, link) { if (listelm->obj == listobj) break; } elm = NEW(Objlist_Entry); elm->obj = obj; if (listelm != NULL) STAILQ_INSERT_AFTER(list, listelm, elm, link); else STAILQ_INSERT_TAIL(list, elm, link); } static void objlist_remove(Objlist *list, Obj_Entry *obj) { Objlist_Entry *elm; if ((elm = objlist_find(list, obj)) != NULL) { STAILQ_REMOVE(list, elm, Struct_Objlist_Entry, link); free(elm); } } /* * Relocate dag rooted in the specified object. * Returns 0 on success, or -1 on failure. */ static int relocate_object_dag(Obj_Entry *root, bool bind_now, Obj_Entry *rtldobj, int flags, RtldLockState *lockstate) { Objlist_Entry *elm; int error; error = 0; STAILQ_FOREACH(elm, &root->dagmembers, link) { error = relocate_object(elm->obj, bind_now, rtldobj, flags, lockstate); if (error == -1) break; } return (error); } /* * Prepare for, or clean after, relocating an object marked with * DT_TEXTREL or DF_TEXTREL. Before relocating, all read-only * segments are remapped read-write. After relocations are done, the * segment's permissions are returned back to the modes specified in * the phdrs. If any relocation happened, or always for wired * program, COW is triggered. */ static int reloc_textrel_prot(Obj_Entry *obj, bool before) { const Elf_Phdr *ph; void *base; size_t l, sz; int prot; for (l = obj->phsize / sizeof(*ph), ph = obj->phdr; l > 0; l--, ph++) { if (ph->p_type != PT_LOAD || (ph->p_flags & PF_W) != 0) continue; base = obj->relocbase + trunc_page(ph->p_vaddr); sz = round_page(ph->p_vaddr + ph->p_filesz) - trunc_page(ph->p_vaddr); prot = convert_prot(ph->p_flags) | (before ? PROT_WRITE : 0); if (mprotect(base, sz, prot) == -1) { _rtld_error("%s: Cannot write-%sable text segment: %s", obj->path, before ? "en" : "dis", rtld_strerror(errno)); return (-1); } } return (0); } /* * Relocate single object. * Returns 0 on success, or -1 on failure. */ static int relocate_object(Obj_Entry *obj, bool bind_now, Obj_Entry *rtldobj, int flags, RtldLockState *lockstate) { if (obj->relocated) return (0); obj->relocated = true; if (obj != rtldobj) dbg("relocating \"%s\"", obj->path); if (obj->symtab == NULL || obj->strtab == NULL || !(obj->valid_hash_sysv || obj->valid_hash_gnu)) { _rtld_error("%s: Shared object has no run-time symbol table", obj->path); return (-1); } /* There are relocations to the write-protected text segment. */ if (obj->textrel && reloc_textrel_prot(obj, true) != 0) return (-1); /* Process the non-PLT non-IFUNC relocations. */ if (reloc_non_plt(obj, rtldobj, flags, lockstate)) return (-1); /* Re-protected the text segment. */ if (obj->textrel && reloc_textrel_prot(obj, false) != 0) return (-1); /* Set the special PLT or GOT entries. */ init_pltgot(obj); /* Process the PLT relocations. */ if (reloc_plt(obj, flags, lockstate) == -1) return (-1); /* Relocate the jump slots if we are doing immediate binding. */ if ((obj->bind_now || bind_now) && reloc_jmpslots(obj, flags, lockstate) == -1) return (-1); if (!obj->mainprog && obj_enforce_relro(obj) == -1) return (-1); /* * Set up the magic number and version in the Obj_Entry. These * were checked in the crt1.o from the original ElfKit, so we * set them for backward compatibility. */ obj->magic = RTLD_MAGIC; obj->version = RTLD_VERSION; return (0); } /* * Relocate newly-loaded shared objects. The argument is a pointer to * the Obj_Entry for the first such object. All objects from the first * to the end of the list of objects are relocated. Returns 0 on success, * or -1 on failure. */ static int relocate_objects(Obj_Entry *first, bool bind_now, Obj_Entry *rtldobj, int flags, RtldLockState *lockstate) { Obj_Entry *obj; int error; for (error = 0, obj = first; obj != NULL; obj = TAILQ_NEXT(obj, next)) { if (obj->marker) continue; error = relocate_object(obj, bind_now, rtldobj, flags, lockstate); if (error == -1) break; } return (error); } /* * The handling of R_MACHINE_IRELATIVE relocations and jumpslots * referencing STT_GNU_IFUNC symbols is postponed till the other * relocations are done. The indirect functions specified as * ifunc are allowed to call other symbols, so we need to have * objects relocated before asking for resolution from indirects. * * The R_MACHINE_IRELATIVE slots are resolved in greedy fashion, * instead of the usual lazy handling of PLT slots. It is * consistent with how GNU does it. */ static int resolve_object_ifunc(Obj_Entry *obj, bool bind_now, int flags, RtldLockState *lockstate) { if (obj->ifuncs_resolved) return (0); obj->ifuncs_resolved = true; if (!obj->irelative && !((obj->bind_now || bind_now) && obj->gnu_ifunc)) return (0); if (obj_disable_relro(obj) == -1 || (obj->irelative && reloc_iresolve(obj, lockstate) == -1) || ((obj->bind_now || bind_now) && obj->gnu_ifunc && reloc_gnu_ifunc(obj, flags, lockstate) == -1) || obj_enforce_relro(obj) == -1) return (-1); return (0); } static int initlist_objects_ifunc(Objlist *list, bool bind_now, int flags, RtldLockState *lockstate) { Objlist_Entry *elm; Obj_Entry *obj; STAILQ_FOREACH(elm, list, link) { obj = elm->obj; if (obj->marker) continue; if (resolve_object_ifunc(obj, bind_now, flags, lockstate) == -1) return (-1); } return (0); } /* * Cleanup procedure. It will be called (by the atexit mechanism) just * before the process exits. */ static void rtld_exit(void) { RtldLockState lockstate; wlock_acquire(rtld_bind_lock, &lockstate); dbg("rtld_exit()"); objlist_call_fini(&list_fini, NULL, &lockstate); /* No need to remove the items from the list, since we are exiting. */ if (!libmap_disable) lm_fini(); lock_release(rtld_bind_lock, &lockstate); } static void rtld_nop_exit(void) { } /* * Iterate over a search path, translate each element, and invoke the * callback on the result. */ static void * path_enumerate(const char *path, path_enum_proc callback, const char *refobj_path, void *arg) { const char *trans; if (path == NULL) return (NULL); path += strspn(path, ":;"); while (*path != '\0') { size_t len; char *res; len = strcspn(path, ":;"); trans = lm_findn(refobj_path, path, len); if (trans) res = callback(trans, strlen(trans), arg); else res = callback(path, len, arg); if (res != NULL) return (res); path += len; path += strspn(path, ":;"); } return (NULL); } struct try_library_args { const char *name; size_t namelen; char *buffer; size_t buflen; int fd; }; static void * try_library_path(const char *dir, size_t dirlen, void *param) { struct try_library_args *arg; int fd; arg = param; if (*dir == '/' || trust) { char *pathname; if (dirlen + 1 + arg->namelen + 1 > arg->buflen) return (NULL); pathname = arg->buffer; strncpy(pathname, dir, dirlen); pathname[dirlen] = '/'; strcpy(pathname + dirlen + 1, arg->name); dbg(" Trying \"%s\"", pathname); fd = open(pathname, O_RDONLY | O_CLOEXEC | O_VERIFY); if (fd >= 0) { dbg(" Opened \"%s\", fd %d", pathname, fd); pathname = xmalloc(dirlen + 1 + arg->namelen + 1); strcpy(pathname, arg->buffer); arg->fd = fd; return (pathname); } else { dbg(" Failed to open \"%s\": %s", pathname, rtld_strerror(errno)); } } return (NULL); } static char * search_library_path(const char *name, const char *path, const char *refobj_path, int *fdp) { char *p; struct try_library_args arg; if (path == NULL) return NULL; arg.name = name; arg.namelen = strlen(name); arg.buffer = xmalloc(PATH_MAX); arg.buflen = PATH_MAX; arg.fd = -1; p = path_enumerate(path, try_library_path, refobj_path, &arg); *fdp = arg.fd; free(arg.buffer); return (p); } /* * Finds the library with the given name using the directory descriptors * listed in the LD_LIBRARY_PATH_FDS environment variable. * * Returns a freshly-opened close-on-exec file descriptor for the library, * or -1 if the library cannot be found. */ static char * search_library_pathfds(const char *name, const char *path, int *fdp) { char *envcopy, *fdstr, *found, *last_token; size_t len; int dirfd, fd; dbg("%s('%s', '%s', fdp)", __func__, name, path); /* Don't load from user-specified libdirs into setuid binaries. */ if (!trust) return (NULL); /* We can't do anything if LD_LIBRARY_PATH_FDS isn't set. */ if (path == NULL) return (NULL); /* LD_LIBRARY_PATH_FDS only works with relative paths. */ if (name[0] == '/') { dbg("Absolute path (%s) passed to %s", name, __func__); return (NULL); } /* * Use strtok_r() to walk the FD:FD:FD list. This requires a local * copy of the path, as strtok_r rewrites separator tokens * with '\0'. */ found = NULL; envcopy = xstrdup(path); for (fdstr = strtok_r(envcopy, ":", &last_token); fdstr != NULL; fdstr = strtok_r(NULL, ":", &last_token)) { dirfd = parse_integer(fdstr); if (dirfd < 0) { _rtld_error("failed to parse directory FD: '%s'", fdstr); break; } fd = __sys_openat(dirfd, name, O_RDONLY | O_CLOEXEC | O_VERIFY); if (fd >= 0) { *fdp = fd; len = strlen(fdstr) + strlen(name) + 3; found = xmalloc(len); if (rtld_snprintf(found, len, "#%d/%s", dirfd, name) < 0) { _rtld_error("error generating '%d/%s'", dirfd, name); rtld_die(); } dbg("open('%s') => %d", found, fd); break; } } free(envcopy); return (found); } int dlclose(void *handle) { RtldLockState lockstate; int error; wlock_acquire(rtld_bind_lock, &lockstate); error = dlclose_locked(handle, &lockstate); lock_release(rtld_bind_lock, &lockstate); return (error); } static int dlclose_locked(void *handle, RtldLockState *lockstate) { Obj_Entry *root; root = dlcheck(handle); if (root == NULL) return -1; LD_UTRACE(UTRACE_DLCLOSE_START, handle, NULL, 0, root->dl_refcount, root->path); /* Unreference the object and its dependencies. */ root->dl_refcount--; if (root->refcount == 1) { /* * The object will be no longer referenced, so we must unload it. * First, call the fini functions. */ objlist_call_fini(&list_fini, root, lockstate); unref_dag(root); /* Finish cleaning up the newly-unreferenced objects. */ GDB_STATE(RT_DELETE,&root->linkmap); unload_object(root, lockstate); GDB_STATE(RT_CONSISTENT,NULL); } else unref_dag(root); LD_UTRACE(UTRACE_DLCLOSE_STOP, handle, NULL, 0, 0, NULL); return 0; } char * dlerror(void) { char *msg = error_message; error_message = NULL; return msg; } /* * This function is deprecated and has no effect. */ void dllockinit(void *context, void *(*_lock_create)(void *context) __unused, void (*_rlock_acquire)(void *lock) __unused, void (*_wlock_acquire)(void *lock) __unused, void (*_lock_release)(void *lock) __unused, void (*_lock_destroy)(void *lock) __unused, void (*context_destroy)(void *context)) { static void *cur_context; static void (*cur_context_destroy)(void *); /* Just destroy the context from the previous call, if necessary. */ if (cur_context_destroy != NULL) cur_context_destroy(cur_context); cur_context = context; cur_context_destroy = context_destroy; } void * dlopen(const char *name, int mode) { return (rtld_dlopen(name, -1, mode)); } void * fdlopen(int fd, int mode) { return (rtld_dlopen(NULL, fd, mode)); } static void * rtld_dlopen(const char *name, int fd, int mode) { RtldLockState lockstate; int lo_flags; LD_UTRACE(UTRACE_DLOPEN_START, NULL, NULL, 0, mode, name); ld_tracing = (mode & RTLD_TRACE) == 0 ? NULL : "1"; if (ld_tracing != NULL) { rlock_acquire(rtld_bind_lock, &lockstate); if (sigsetjmp(lockstate.env, 0) != 0) lock_upgrade(rtld_bind_lock, &lockstate); environ = __DECONST(char **, *get_program_var_addr("environ", &lockstate)); lock_release(rtld_bind_lock, &lockstate); } lo_flags = RTLD_LO_DLOPEN; if (mode & RTLD_NODELETE) lo_flags |= RTLD_LO_NODELETE; if (mode & RTLD_NOLOAD) lo_flags |= RTLD_LO_NOLOAD; if (ld_tracing != NULL) lo_flags |= RTLD_LO_TRACE; return (dlopen_object(name, fd, obj_main, lo_flags, mode & (RTLD_MODEMASK | RTLD_GLOBAL), NULL)); } static void dlopen_cleanup(Obj_Entry *obj, RtldLockState *lockstate) { obj->dl_refcount--; unref_dag(obj); if (obj->refcount == 0) unload_object(obj, lockstate); } static Obj_Entry * dlopen_object(const char *name, int fd, Obj_Entry *refobj, int lo_flags, int mode, RtldLockState *lockstate) { Obj_Entry *old_obj_tail; Obj_Entry *obj; Objlist initlist; RtldLockState mlockstate; int result; objlist_init(&initlist); if (lockstate == NULL && !(lo_flags & RTLD_LO_EARLY)) { wlock_acquire(rtld_bind_lock, &mlockstate); lockstate = &mlockstate; } GDB_STATE(RT_ADD,NULL); old_obj_tail = globallist_curr(TAILQ_LAST(&obj_list, obj_entry_q)); obj = NULL; if (name == NULL && fd == -1) { obj = obj_main; obj->refcount++; } else { obj = load_object(name, fd, refobj, lo_flags); } if (obj) { obj->dl_refcount++; if (mode & RTLD_GLOBAL && objlist_find(&list_global, obj) == NULL) objlist_push_tail(&list_global, obj); if (globallist_next(old_obj_tail) != NULL) { /* We loaded something new. */ assert(globallist_next(old_obj_tail) == obj); result = 0; if ((lo_flags & RTLD_LO_EARLY) == 0 && obj->static_tls && !allocate_tls_offset(obj)) { _rtld_error("%s: No space available " "for static Thread Local Storage", obj->path); result = -1; } if (result != -1) result = load_needed_objects(obj, lo_flags & (RTLD_LO_DLOPEN | RTLD_LO_EARLY)); init_dag(obj); ref_dag(obj); if (result != -1) result = rtld_verify_versions(&obj->dagmembers); if (result != -1 && ld_tracing) goto trace; if (result == -1 || relocate_object_dag(obj, (mode & RTLD_MODEMASK) == RTLD_NOW, &obj_rtld, (lo_flags & RTLD_LO_EARLY) ? SYMLOOK_EARLY : 0, lockstate) == -1) { dlopen_cleanup(obj, lockstate); obj = NULL; } else if (lo_flags & RTLD_LO_EARLY) { /* * Do not call the init functions for early loaded * filtees. The image is still not initialized enough * for them to work. * * Our object is found by the global object list and * will be ordered among all init calls done right * before transferring control to main. */ } else { /* Make list of init functions to call. */ initlist_add_objects(obj, obj, &initlist); } /* * Process all no_delete or global objects here, given * them own DAGs to prevent their dependencies from being * unloaded. This has to be done after we have loaded all * of the dependencies, so that we do not miss any. */ if (obj != NULL) process_z(obj); } else { /* * Bump the reference counts for objects on this DAG. If * this is the first dlopen() call for the object that was * already loaded as a dependency, initialize the dag * starting at it. */ init_dag(obj); ref_dag(obj); if ((lo_flags & RTLD_LO_TRACE) != 0) goto trace; } if (obj != NULL && ((lo_flags & RTLD_LO_NODELETE) != 0 || obj->z_nodelete) && !obj->ref_nodel) { dbg("obj %s nodelete", obj->path); ref_dag(obj); obj->z_nodelete = obj->ref_nodel = true; } } LD_UTRACE(UTRACE_DLOPEN_STOP, obj, NULL, 0, obj ? obj->dl_refcount : 0, name); GDB_STATE(RT_CONSISTENT,obj ? &obj->linkmap : NULL); if ((lo_flags & RTLD_LO_EARLY) == 0) { map_stacks_exec(lockstate); if (obj != NULL) distribute_static_tls(&initlist, lockstate); } if (initlist_objects_ifunc(&initlist, (mode & RTLD_MODEMASK) == RTLD_NOW, (lo_flags & RTLD_LO_EARLY) ? SYMLOOK_EARLY : 0, lockstate) == -1) { objlist_clear(&initlist); dlopen_cleanup(obj, lockstate); if (lockstate == &mlockstate) lock_release(rtld_bind_lock, lockstate); return (NULL); } if (!(lo_flags & RTLD_LO_EARLY)) { /* Call the init functions. */ objlist_call_init(&initlist, lockstate); } objlist_clear(&initlist); if (lockstate == &mlockstate) lock_release(rtld_bind_lock, lockstate); return obj; trace: trace_loaded_objects(obj); if (lockstate == &mlockstate) lock_release(rtld_bind_lock, lockstate); exit(0); } static void * do_dlsym(void *handle, const char *name, void *retaddr, const Ver_Entry *ve, int flags) { DoneList donelist; const Obj_Entry *obj, *defobj; const Elf_Sym *def; SymLook req; RtldLockState lockstate; tls_index ti; void *sym; int res; def = NULL; defobj = NULL; symlook_init(&req, name); req.ventry = ve; req.flags = flags | SYMLOOK_IN_PLT; req.lockstate = &lockstate; LD_UTRACE(UTRACE_DLSYM_START, handle, NULL, 0, 0, name); rlock_acquire(rtld_bind_lock, &lockstate); if (sigsetjmp(lockstate.env, 0) != 0) lock_upgrade(rtld_bind_lock, &lockstate); if (handle == NULL || handle == RTLD_NEXT || handle == RTLD_DEFAULT || handle == RTLD_SELF) { if ((obj = obj_from_addr(retaddr)) == NULL) { _rtld_error("Cannot determine caller's shared object"); lock_release(rtld_bind_lock, &lockstate); LD_UTRACE(UTRACE_DLSYM_STOP, handle, NULL, 0, 0, name); return NULL; } if (handle == NULL) { /* Just the caller's shared object. */ res = symlook_obj(&req, obj); if (res == 0) { def = req.sym_out; defobj = req.defobj_out; } } else if (handle == RTLD_NEXT || /* Objects after caller's */ handle == RTLD_SELF) { /* ... caller included */ if (handle == RTLD_NEXT) obj = globallist_next(obj); for (; obj != NULL; obj = TAILQ_NEXT(obj, next)) { if (obj->marker) continue; res = symlook_obj(&req, obj); if (res == 0) { if (def == NULL || ELF_ST_BIND(req.sym_out->st_info) != STB_WEAK) { def = req.sym_out; defobj = req.defobj_out; if (ELF_ST_BIND(def->st_info) != STB_WEAK) break; } } } /* * Search the dynamic linker itself, and possibly resolve the * symbol from there. This is how the application links to * dynamic linker services such as dlopen. */ if (def == NULL || ELF_ST_BIND(def->st_info) == STB_WEAK) { res = symlook_obj(&req, &obj_rtld); if (res == 0) { def = req.sym_out; defobj = req.defobj_out; } } } else { assert(handle == RTLD_DEFAULT); res = symlook_default(&req, obj); if (res == 0) { defobj = req.defobj_out; def = req.sym_out; } } } else { if ((obj = dlcheck(handle)) == NULL) { lock_release(rtld_bind_lock, &lockstate); LD_UTRACE(UTRACE_DLSYM_STOP, handle, NULL, 0, 0, name); return NULL; } donelist_init(&donelist); if (obj->mainprog) { /* Handle obtained by dlopen(NULL, ...) implies global scope. */ res = symlook_global(&req, &donelist); if (res == 0) { def = req.sym_out; defobj = req.defobj_out; } /* * Search the dynamic linker itself, and possibly resolve the * symbol from there. This is how the application links to * dynamic linker services such as dlopen. */ if (def == NULL || ELF_ST_BIND(def->st_info) == STB_WEAK) { res = symlook_obj(&req, &obj_rtld); if (res == 0) { def = req.sym_out; defobj = req.defobj_out; } } } else { /* Search the whole DAG rooted at the given object. */ res = symlook_list(&req, &obj->dagmembers, &donelist); if (res == 0) { def = req.sym_out; defobj = req.defobj_out; } } } if (def != NULL) { lock_release(rtld_bind_lock, &lockstate); /* * The value required by the caller is derived from the value * of the symbol. this is simply the relocated value of the * symbol. */ if (ELF_ST_TYPE(def->st_info) == STT_FUNC) sym = make_function_pointer(def, defobj); else if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) sym = rtld_resolve_ifunc(defobj, def); else if (ELF_ST_TYPE(def->st_info) == STT_TLS) { ti.ti_module = defobj->tlsindex; ti.ti_offset = def->st_value; sym = __tls_get_addr(&ti); } else sym = defobj->relocbase + def->st_value; LD_UTRACE(UTRACE_DLSYM_STOP, handle, sym, 0, 0, name); return (sym); } _rtld_error("Undefined symbol \"%s%s%s\"", name, ve != NULL ? "@" : "", ve != NULL ? ve->name : ""); lock_release(rtld_bind_lock, &lockstate); LD_UTRACE(UTRACE_DLSYM_STOP, handle, NULL, 0, 0, name); return NULL; } void * dlsym(void *handle, const char *name) { return do_dlsym(handle, name, __builtin_return_address(0), NULL, SYMLOOK_DLSYM); } dlfunc_t dlfunc(void *handle, const char *name) { union { void *d; dlfunc_t f; } rv; rv.d = do_dlsym(handle, name, __builtin_return_address(0), NULL, SYMLOOK_DLSYM); return (rv.f); } void * dlvsym(void *handle, const char *name, const char *version) { Ver_Entry ventry; ventry.name = version; ventry.file = NULL; ventry.hash = elf_hash(version); ventry.flags= 0; return do_dlsym(handle, name, __builtin_return_address(0), &ventry, SYMLOOK_DLSYM); } int _rtld_addr_phdr(const void *addr, struct dl_phdr_info *phdr_info) { const Obj_Entry *obj; RtldLockState lockstate; rlock_acquire(rtld_bind_lock, &lockstate); obj = obj_from_addr(addr); if (obj == NULL) { _rtld_error("No shared object contains address"); lock_release(rtld_bind_lock, &lockstate); return (0); } rtld_fill_dl_phdr_info(obj, phdr_info); lock_release(rtld_bind_lock, &lockstate); return (1); } int dladdr(const void *addr, Dl_info *info) { const Obj_Entry *obj; const Elf_Sym *def; void *symbol_addr; unsigned long symoffset; RtldLockState lockstate; rlock_acquire(rtld_bind_lock, &lockstate); obj = obj_from_addr(addr); if (obj == NULL) { _rtld_error("No shared object contains address"); lock_release(rtld_bind_lock, &lockstate); return 0; } info->dli_fname = obj->path; info->dli_fbase = obj->mapbase; info->dli_saddr = (void *)0; info->dli_sname = NULL; /* * Walk the symbol list looking for the symbol whose address is * closest to the address sent in. */ for (symoffset = 0; symoffset < obj->dynsymcount; symoffset++) { def = obj->symtab + symoffset; /* * For skip the symbol if st_shndx is either SHN_UNDEF or * SHN_COMMON. */ if (def->st_shndx == SHN_UNDEF || def->st_shndx == SHN_COMMON) continue; /* * If the symbol is greater than the specified address, or if it * is further away from addr than the current nearest symbol, * then reject it. */ symbol_addr = obj->relocbase + def->st_value; if (symbol_addr > addr || symbol_addr < info->dli_saddr) continue; /* Update our idea of the nearest symbol. */ info->dli_sname = obj->strtab + def->st_name; info->dli_saddr = symbol_addr; /* Exact match? */ if (info->dli_saddr == addr) break; } lock_release(rtld_bind_lock, &lockstate); return 1; } int dlinfo(void *handle, int request, void *p) { const Obj_Entry *obj; RtldLockState lockstate; int error; rlock_acquire(rtld_bind_lock, &lockstate); if (handle == NULL || handle == RTLD_SELF) { void *retaddr; retaddr = __builtin_return_address(0); /* __GNUC__ only */ if ((obj = obj_from_addr(retaddr)) == NULL) _rtld_error("Cannot determine caller's shared object"); } else obj = dlcheck(handle); if (obj == NULL) { lock_release(rtld_bind_lock, &lockstate); return (-1); } error = 0; switch (request) { case RTLD_DI_LINKMAP: *((struct link_map const **)p) = &obj->linkmap; break; case RTLD_DI_ORIGIN: error = rtld_dirname(obj->path, p); break; case RTLD_DI_SERINFOSIZE: case RTLD_DI_SERINFO: error = do_search_info(obj, request, (struct dl_serinfo *)p); break; default: _rtld_error("Invalid request %d passed to dlinfo()", request); error = -1; } lock_release(rtld_bind_lock, &lockstate); return (error); } static void rtld_fill_dl_phdr_info(const Obj_Entry *obj, struct dl_phdr_info *phdr_info) { phdr_info->dlpi_addr = (Elf_Addr)obj->relocbase; phdr_info->dlpi_name = obj->path; phdr_info->dlpi_phdr = obj->phdr; phdr_info->dlpi_phnum = obj->phsize / sizeof(obj->phdr[0]); phdr_info->dlpi_tls_modid = obj->tlsindex; phdr_info->dlpi_tls_data = obj->tlsinit; phdr_info->dlpi_adds = obj_loads; phdr_info->dlpi_subs = obj_loads - obj_count; } int dl_iterate_phdr(__dl_iterate_hdr_callback callback, void *param) { struct dl_phdr_info phdr_info; Obj_Entry *obj, marker; RtldLockState bind_lockstate, phdr_lockstate; int error; init_marker(&marker); error = 0; wlock_acquire(rtld_phdr_lock, &phdr_lockstate); wlock_acquire(rtld_bind_lock, &bind_lockstate); for (obj = globallist_curr(TAILQ_FIRST(&obj_list)); obj != NULL;) { TAILQ_INSERT_AFTER(&obj_list, obj, &marker, next); rtld_fill_dl_phdr_info(obj, &phdr_info); hold_object(obj); lock_release(rtld_bind_lock, &bind_lockstate); error = callback(&phdr_info, sizeof phdr_info, param); wlock_acquire(rtld_bind_lock, &bind_lockstate); unhold_object(obj); obj = globallist_next(&marker); TAILQ_REMOVE(&obj_list, &marker, next); if (error != 0) { lock_release(rtld_bind_lock, &bind_lockstate); lock_release(rtld_phdr_lock, &phdr_lockstate); return (error); } } if (error == 0) { rtld_fill_dl_phdr_info(&obj_rtld, &phdr_info); lock_release(rtld_bind_lock, &bind_lockstate); error = callback(&phdr_info, sizeof(phdr_info), param); } lock_release(rtld_phdr_lock, &phdr_lockstate); return (error); } static void * fill_search_info(const char *dir, size_t dirlen, void *param) { struct fill_search_info_args *arg; arg = param; if (arg->request == RTLD_DI_SERINFOSIZE) { arg->serinfo->dls_cnt ++; arg->serinfo->dls_size += sizeof(struct dl_serpath) + dirlen + 1; } else { struct dl_serpath *s_entry; s_entry = arg->serpath; s_entry->dls_name = arg->strspace; s_entry->dls_flags = arg->flags; strncpy(arg->strspace, dir, dirlen); arg->strspace[dirlen] = '\0'; arg->strspace += dirlen + 1; arg->serpath++; } return (NULL); } static int do_search_info(const Obj_Entry *obj, int request, struct dl_serinfo *info) { struct dl_serinfo _info; struct fill_search_info_args args; args.request = RTLD_DI_SERINFOSIZE; args.serinfo = &_info; _info.dls_size = __offsetof(struct dl_serinfo, dls_serpath); _info.dls_cnt = 0; path_enumerate(obj->rpath, fill_search_info, NULL, &args); path_enumerate(ld_library_path, fill_search_info, NULL, &args); path_enumerate(obj->runpath, fill_search_info, NULL, &args); path_enumerate(gethints(obj->z_nodeflib), fill_search_info, NULL, &args); if (!obj->z_nodeflib) path_enumerate(ld_standard_library_path, fill_search_info, NULL, &args); if (request == RTLD_DI_SERINFOSIZE) { info->dls_size = _info.dls_size; info->dls_cnt = _info.dls_cnt; return (0); } if (info->dls_cnt != _info.dls_cnt || info->dls_size != _info.dls_size) { _rtld_error("Uninitialized Dl_serinfo struct passed to dlinfo()"); return (-1); } args.request = RTLD_DI_SERINFO; args.serinfo = info; args.serpath = &info->dls_serpath[0]; args.strspace = (char *)&info->dls_serpath[_info.dls_cnt]; args.flags = LA_SER_RUNPATH; if (path_enumerate(obj->rpath, fill_search_info, NULL, &args) != NULL) return (-1); args.flags = LA_SER_LIBPATH; if (path_enumerate(ld_library_path, fill_search_info, NULL, &args) != NULL) return (-1); args.flags = LA_SER_RUNPATH; if (path_enumerate(obj->runpath, fill_search_info, NULL, &args) != NULL) return (-1); args.flags = LA_SER_CONFIG; if (path_enumerate(gethints(obj->z_nodeflib), fill_search_info, NULL, &args) != NULL) return (-1); args.flags = LA_SER_DEFAULT; if (!obj->z_nodeflib && path_enumerate(ld_standard_library_path, fill_search_info, NULL, &args) != NULL) return (-1); return (0); } static int rtld_dirname(const char *path, char *bname) { const char *endp; /* Empty or NULL string gets treated as "." */ if (path == NULL || *path == '\0') { bname[0] = '.'; bname[1] = '\0'; return (0); } /* Strip trailing slashes */ endp = path + strlen(path) - 1; while (endp > path && *endp == '/') endp--; /* Find the start of the dir */ while (endp > path && *endp != '/') endp--; /* Either the dir is "/" or there are no slashes */ if (endp == path) { bname[0] = *endp == '/' ? '/' : '.'; bname[1] = '\0'; return (0); } else { do { endp--; } while (endp > path && *endp == '/'); } if (endp - path + 2 > PATH_MAX) { _rtld_error("Filename is too long: %s", path); return(-1); } strncpy(bname, path, endp - path + 1); bname[endp - path + 1] = '\0'; return (0); } static int rtld_dirname_abs(const char *path, char *base) { char *last; if (realpath(path, base) == NULL) return (-1); dbg("%s -> %s", path, base); last = strrchr(base, '/'); if (last == NULL) return (-1); if (last != base) *last = '\0'; return (0); } static void linkmap_add(Obj_Entry *obj) { struct link_map *l = &obj->linkmap; struct link_map *prev; obj->linkmap.l_name = obj->path; obj->linkmap.l_addr = obj->mapbase; obj->linkmap.l_ld = obj->dynamic; #ifdef __mips__ /* GDB needs load offset on MIPS to use the symbols */ obj->linkmap.l_offs = obj->relocbase; #endif if (r_debug.r_map == NULL) { r_debug.r_map = l; return; } /* * Scan to the end of the list, but not past the entry for the * dynamic linker, which we want to keep at the very end. */ for (prev = r_debug.r_map; prev->l_next != NULL && prev->l_next != &obj_rtld.linkmap; prev = prev->l_next) ; /* Link in the new entry. */ l->l_prev = prev; l->l_next = prev->l_next; if (l->l_next != NULL) l->l_next->l_prev = l; prev->l_next = l; } static void linkmap_delete(Obj_Entry *obj) { struct link_map *l = &obj->linkmap; if (l->l_prev == NULL) { if ((r_debug.r_map = l->l_next) != NULL) l->l_next->l_prev = NULL; return; } if ((l->l_prev->l_next = l->l_next) != NULL) l->l_next->l_prev = l->l_prev; } /* * Function for the debugger to set a breakpoint on to gain control. * * The two parameters allow the debugger to easily find and determine * what the runtime loader is doing and to whom it is doing it. * * When the loadhook trap is hit (r_debug_state, set at program * initialization), the arguments can be found on the stack: * * +8 struct link_map *m * +4 struct r_debug *rd * +0 RetAddr */ void r_debug_state(struct r_debug* rd __unused, struct link_map *m __unused) { /* * The following is a hack to force the compiler to emit calls to * this function, even when optimizing. If the function is empty, * the compiler is not obliged to emit any code for calls to it, * even when marked __noinline. However, gdb depends on those * calls being made. */ __compiler_membar(); } /* * A function called after init routines have completed. This can be used to * break before a program's entry routine is called, and can be used when * main is not available in the symbol table. */ void _r_debug_postinit(struct link_map *m __unused) { /* See r_debug_state(). */ __compiler_membar(); } static void release_object(Obj_Entry *obj) { if (obj->holdcount > 0) { obj->unholdfree = true; return; } munmap(obj->mapbase, obj->mapsize); linkmap_delete(obj); obj_free(obj); } /* * Get address of the pointer variable in the main program. * Prefer non-weak symbol over the weak one. */ static const void ** get_program_var_addr(const char *name, RtldLockState *lockstate) { SymLook req; DoneList donelist; symlook_init(&req, name); req.lockstate = lockstate; donelist_init(&donelist); if (symlook_global(&req, &donelist) != 0) return (NULL); if (ELF_ST_TYPE(req.sym_out->st_info) == STT_FUNC) return ((const void **)make_function_pointer(req.sym_out, req.defobj_out)); else if (ELF_ST_TYPE(req.sym_out->st_info) == STT_GNU_IFUNC) return ((const void **)rtld_resolve_ifunc(req.defobj_out, req.sym_out)); else return ((const void **)(req.defobj_out->relocbase + req.sym_out->st_value)); } /* * Set a pointer variable in the main program to the given value. This * is used to set key variables such as "environ" before any of the * init functions are called. */ static void set_program_var(const char *name, const void *value) { const void **addr; if ((addr = get_program_var_addr(name, NULL)) != NULL) { dbg("\"%s\": *%p <-- %p", name, addr, value); *addr = value; } } /* * Search the global objects, including dependencies and main object, * for the given symbol. */ static int symlook_global(SymLook *req, DoneList *donelist) { SymLook req1; const Objlist_Entry *elm; int res; symlook_init_from_req(&req1, req); /* Search all objects loaded at program start up. */ if (req->defobj_out == NULL || ELF_ST_BIND(req->sym_out->st_info) == STB_WEAK) { res = symlook_list(&req1, &list_main, donelist); if (res == 0 && (req->defobj_out == NULL || ELF_ST_BIND(req1.sym_out->st_info) != STB_WEAK)) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; assert(req->defobj_out != NULL); } } /* Search all DAGs whose roots are RTLD_GLOBAL objects. */ STAILQ_FOREACH(elm, &list_global, link) { if (req->defobj_out != NULL && ELF_ST_BIND(req->sym_out->st_info) != STB_WEAK) break; res = symlook_list(&req1, &elm->obj->dagmembers, donelist); if (res == 0 && (req->defobj_out == NULL || ELF_ST_BIND(req1.sym_out->st_info) != STB_WEAK)) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; assert(req->defobj_out != NULL); } } return (req->sym_out != NULL ? 0 : ESRCH); } /* * Given a symbol name in a referencing object, find the corresponding * definition of the symbol. Returns a pointer to the symbol, or NULL if * no definition was found. Returns a pointer to the Obj_Entry of the * defining object via the reference parameter DEFOBJ_OUT. */ static int symlook_default(SymLook *req, const Obj_Entry *refobj) { DoneList donelist; const Objlist_Entry *elm; SymLook req1; int res; donelist_init(&donelist); symlook_init_from_req(&req1, req); /* * Look first in the referencing object if linked symbolically, * and similarly handle protected symbols. */ res = symlook_obj(&req1, refobj); if (res == 0 && (refobj->symbolic || ELF_ST_VISIBILITY(req1.sym_out->st_other) == STV_PROTECTED)) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; assert(req->defobj_out != NULL); } if (refobj->symbolic || req->defobj_out != NULL) donelist_check(&donelist, refobj); symlook_global(req, &donelist); /* Search all dlopened DAGs containing the referencing object. */ STAILQ_FOREACH(elm, &refobj->dldags, link) { if (req->sym_out != NULL && ELF_ST_BIND(req->sym_out->st_info) != STB_WEAK) break; res = symlook_list(&req1, &elm->obj->dagmembers, &donelist); if (res == 0 && (req->sym_out == NULL || ELF_ST_BIND(req1.sym_out->st_info) != STB_WEAK)) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; assert(req->defobj_out != NULL); } } /* * Search the dynamic linker itself, and possibly resolve the * symbol from there. This is how the application links to * dynamic linker services such as dlopen. */ if (req->sym_out == NULL || ELF_ST_BIND(req->sym_out->st_info) == STB_WEAK) { res = symlook_obj(&req1, &obj_rtld); if (res == 0) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; assert(req->defobj_out != NULL); } } return (req->sym_out != NULL ? 0 : ESRCH); } static int symlook_list(SymLook *req, const Objlist *objlist, DoneList *dlp) { const Elf_Sym *def; const Obj_Entry *defobj; const Objlist_Entry *elm; SymLook req1; int res; def = NULL; defobj = NULL; STAILQ_FOREACH(elm, objlist, link) { if (donelist_check(dlp, elm->obj)) continue; symlook_init_from_req(&req1, req); if ((res = symlook_obj(&req1, elm->obj)) == 0) { if (def == NULL || ELF_ST_BIND(req1.sym_out->st_info) != STB_WEAK) { def = req1.sym_out; defobj = req1.defobj_out; if (ELF_ST_BIND(def->st_info) != STB_WEAK) break; } } } if (def != NULL) { req->sym_out = def; req->defobj_out = defobj; return (0); } return (ESRCH); } /* * Search the chain of DAGS cointed to by the given Needed_Entry * for a symbol of the given name. Each DAG is scanned completely * before advancing to the next one. Returns a pointer to the symbol, * or NULL if no definition was found. */ static int symlook_needed(SymLook *req, const Needed_Entry *needed, DoneList *dlp) { const Elf_Sym *def; const Needed_Entry *n; const Obj_Entry *defobj; SymLook req1; int res; def = NULL; defobj = NULL; symlook_init_from_req(&req1, req); for (n = needed; n != NULL; n = n->next) { if (n->obj == NULL || (res = symlook_list(&req1, &n->obj->dagmembers, dlp)) != 0) continue; if (def == NULL || ELF_ST_BIND(req1.sym_out->st_info) != STB_WEAK) { def = req1.sym_out; defobj = req1.defobj_out; if (ELF_ST_BIND(def->st_info) != STB_WEAK) break; } } if (def != NULL) { req->sym_out = def; req->defobj_out = defobj; return (0); } return (ESRCH); } /* * Search the symbol table of a single shared object for a symbol of * the given name and version, if requested. Returns a pointer to the * symbol, or NULL if no definition was found. If the object is * filter, return filtered symbol from filtee. * * The symbol's hash value is passed in for efficiency reasons; that * eliminates many recomputations of the hash value. */ int symlook_obj(SymLook *req, const Obj_Entry *obj) { DoneList donelist; SymLook req1; int flags, res, mres; /* * If there is at least one valid hash at this point, we prefer to * use the faster GNU version if available. */ if (obj->valid_hash_gnu) mres = symlook_obj1_gnu(req, obj); else if (obj->valid_hash_sysv) mres = symlook_obj1_sysv(req, obj); else return (EINVAL); if (mres == 0) { if (obj->needed_filtees != NULL) { flags = (req->flags & SYMLOOK_EARLY) ? RTLD_LO_EARLY : 0; load_filtees(__DECONST(Obj_Entry *, obj), flags, req->lockstate); donelist_init(&donelist); symlook_init_from_req(&req1, req); res = symlook_needed(&req1, obj->needed_filtees, &donelist); if (res == 0) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; } return (res); } if (obj->needed_aux_filtees != NULL) { flags = (req->flags & SYMLOOK_EARLY) ? RTLD_LO_EARLY : 0; load_filtees(__DECONST(Obj_Entry *, obj), flags, req->lockstate); donelist_init(&donelist); symlook_init_from_req(&req1, req); res = symlook_needed(&req1, obj->needed_aux_filtees, &donelist); if (res == 0) { req->sym_out = req1.sym_out; req->defobj_out = req1.defobj_out; return (res); } } } return (mres); } /* Symbol match routine common to both hash functions */ static bool matched_symbol(SymLook *req, const Obj_Entry *obj, Sym_Match_Result *result, const unsigned long symnum) { Elf_Versym verndx; const Elf_Sym *symp; const char *strp; symp = obj->symtab + symnum; strp = obj->strtab + symp->st_name; switch (ELF_ST_TYPE(symp->st_info)) { case STT_FUNC: case STT_NOTYPE: case STT_OBJECT: case STT_COMMON: case STT_GNU_IFUNC: if (symp->st_value == 0) return (false); /* fallthrough */ case STT_TLS: if (symp->st_shndx != SHN_UNDEF) break; #ifndef __mips__ else if (((req->flags & SYMLOOK_IN_PLT) == 0) && (ELF_ST_TYPE(symp->st_info) == STT_FUNC)) break; #endif /* fallthrough */ default: return (false); } if (req->name[0] != strp[0] || strcmp(req->name, strp) != 0) return (false); if (req->ventry == NULL) { if (obj->versyms != NULL) { verndx = VER_NDX(obj->versyms[symnum]); if (verndx > obj->vernum) { _rtld_error( "%s: symbol %s references wrong version %d", obj->path, obj->strtab + symnum, verndx); return (false); } /* * If we are not called from dlsym (i.e. this * is a normal relocation from unversioned * binary), accept the symbol immediately if * it happens to have first version after this * shared object became versioned. Otherwise, * if symbol is versioned and not hidden, * remember it. If it is the only symbol with * this name exported by the shared object, it * will be returned as a match by the calling * function. If symbol is global (verndx < 2) * accept it unconditionally. */ if ((req->flags & SYMLOOK_DLSYM) == 0 && verndx == VER_NDX_GIVEN) { result->sym_out = symp; return (true); } else if (verndx >= VER_NDX_GIVEN) { if ((obj->versyms[symnum] & VER_NDX_HIDDEN) == 0) { if (result->vsymp == NULL) result->vsymp = symp; result->vcount++; } return (false); } } result->sym_out = symp; return (true); } if (obj->versyms == NULL) { if (object_match_name(obj, req->ventry->name)) { _rtld_error("%s: object %s should provide version %s " "for symbol %s", obj_rtld.path, obj->path, req->ventry->name, obj->strtab + symnum); return (false); } } else { verndx = VER_NDX(obj->versyms[symnum]); if (verndx > obj->vernum) { _rtld_error("%s: symbol %s references wrong version %d", obj->path, obj->strtab + symnum, verndx); return (false); } if (obj->vertab[verndx].hash != req->ventry->hash || strcmp(obj->vertab[verndx].name, req->ventry->name)) { /* * Version does not match. Look if this is a * global symbol and if it is not hidden. If * global symbol (verndx < 2) is available, * use it. Do not return symbol if we are * called by dlvsym, because dlvsym looks for * a specific version and default one is not * what dlvsym wants. */ if ((req->flags & SYMLOOK_DLSYM) || (verndx >= VER_NDX_GIVEN) || (obj->versyms[symnum] & VER_NDX_HIDDEN)) return (false); } } result->sym_out = symp; return (true); } /* * Search for symbol using SysV hash function. * obj->buckets is known not to be NULL at this point; the test for this was * performed with the obj->valid_hash_sysv assignment. */ static int symlook_obj1_sysv(SymLook *req, const Obj_Entry *obj) { unsigned long symnum; Sym_Match_Result matchres; matchres.sym_out = NULL; matchres.vsymp = NULL; matchres.vcount = 0; for (symnum = obj->buckets[req->hash % obj->nbuckets]; symnum != STN_UNDEF; symnum = obj->chains[symnum]) { if (symnum >= obj->nchains) return (ESRCH); /* Bad object */ if (matched_symbol(req, obj, &matchres, symnum)) { req->sym_out = matchres.sym_out; req->defobj_out = obj; return (0); } } if (matchres.vcount == 1) { req->sym_out = matchres.vsymp; req->defobj_out = obj; return (0); } return (ESRCH); } /* Search for symbol using GNU hash function */ static int symlook_obj1_gnu(SymLook *req, const Obj_Entry *obj) { Elf_Addr bloom_word; const Elf32_Word *hashval; Elf32_Word bucket; Sym_Match_Result matchres; unsigned int h1, h2; unsigned long symnum; matchres.sym_out = NULL; matchres.vsymp = NULL; matchres.vcount = 0; /* Pick right bitmask word from Bloom filter array */ bloom_word = obj->bloom_gnu[(req->hash_gnu / __ELF_WORD_SIZE) & obj->maskwords_bm_gnu]; /* Calculate modulus word size of gnu hash and its derivative */ h1 = req->hash_gnu & (__ELF_WORD_SIZE - 1); h2 = ((req->hash_gnu >> obj->shift2_gnu) & (__ELF_WORD_SIZE - 1)); /* Filter out the "definitely not in set" queries */ if (((bloom_word >> h1) & (bloom_word >> h2) & 1) == 0) return (ESRCH); /* Locate hash chain and corresponding value element*/ bucket = obj->buckets_gnu[req->hash_gnu % obj->nbuckets_gnu]; if (bucket == 0) return (ESRCH); hashval = &obj->chain_zero_gnu[bucket]; do { if (((*hashval ^ req->hash_gnu) >> 1) == 0) { symnum = hashval - obj->chain_zero_gnu; if (matched_symbol(req, obj, &matchres, symnum)) { req->sym_out = matchres.sym_out; req->defobj_out = obj; return (0); } } } while ((*hashval++ & 1) == 0); if (matchres.vcount == 1) { req->sym_out = matchres.vsymp; req->defobj_out = obj; return (0); } return (ESRCH); } static void trace_loaded_objects(Obj_Entry *obj) { const char *fmt1, *fmt2, *fmt, *main_local, *list_containers; int c; if ((main_local = getenv(_LD("TRACE_LOADED_OBJECTS_PROGNAME"))) == NULL) main_local = ""; if ((fmt1 = getenv(_LD("TRACE_LOADED_OBJECTS_FMT1"))) == NULL) fmt1 = "\t%o => %p (%x)\n"; if ((fmt2 = getenv(_LD("TRACE_LOADED_OBJECTS_FMT2"))) == NULL) fmt2 = "\t%o (%x)\n"; list_containers = getenv(_LD("TRACE_LOADED_OBJECTS_ALL")); for (; obj != NULL; obj = TAILQ_NEXT(obj, next)) { Needed_Entry *needed; const char *name, *path; bool is_lib; if (obj->marker) continue; if (list_containers && obj->needed != NULL) rtld_printf("%s:\n", obj->path); for (needed = obj->needed; needed; needed = needed->next) { if (needed->obj != NULL) { if (needed->obj->traced && !list_containers) continue; needed->obj->traced = true; path = needed->obj->path; } else path = "not found"; name = obj->strtab + needed->name; is_lib = strncmp(name, "lib", 3) == 0; /* XXX - bogus */ fmt = is_lib ? fmt1 : fmt2; while ((c = *fmt++) != '\0') { switch (c) { default: rtld_putchar(c); continue; case '\\': switch (c = *fmt) { case '\0': continue; case 'n': rtld_putchar('\n'); break; case 't': rtld_putchar('\t'); break; } break; case '%': switch (c = *fmt) { case '\0': continue; case '%': default: rtld_putchar(c); break; case 'A': rtld_putstr(main_local); break; case 'a': rtld_putstr(obj_main->path); break; case 'o': rtld_putstr(name); break; #if 0 case 'm': rtld_printf("%d", sodp->sod_major); break; case 'n': rtld_printf("%d", sodp->sod_minor); break; #endif case 'p': rtld_putstr(path); break; case 'x': rtld_printf("%p", needed->obj ? needed->obj->mapbase : 0); break; } break; } ++fmt; } } } } /* * Unload a dlopened object and its dependencies from memory and from * our data structures. It is assumed that the DAG rooted in the * object has already been unreferenced, and that the object has a * reference count of 0. */ static void unload_object(Obj_Entry *root, RtldLockState *lockstate) { Obj_Entry marker, *obj, *next; assert(root->refcount == 0); /* * Pass over the DAG removing unreferenced objects from * appropriate lists. */ unlink_object(root); /* Unmap all objects that are no longer referenced. */ for (obj = TAILQ_FIRST(&obj_list); obj != NULL; obj = next) { next = TAILQ_NEXT(obj, next); if (obj->marker || obj->refcount != 0) continue; LD_UTRACE(UTRACE_UNLOAD_OBJECT, obj, obj->mapbase, obj->mapsize, 0, obj->path); dbg("unloading \"%s\"", obj->path); /* * Unlink the object now to prevent new references from * being acquired while the bind lock is dropped in * recursive dlclose() invocations. */ TAILQ_REMOVE(&obj_list, obj, next); obj_count--; if (obj->filtees_loaded) { if (next != NULL) { init_marker(&marker); TAILQ_INSERT_BEFORE(next, &marker, next); unload_filtees(obj, lockstate); next = TAILQ_NEXT(&marker, next); TAILQ_REMOVE(&obj_list, &marker, next); } else unload_filtees(obj, lockstate); } release_object(obj); } } static void unlink_object(Obj_Entry *root) { Objlist_Entry *elm; if (root->refcount == 0) { /* Remove the object from the RTLD_GLOBAL list. */ objlist_remove(&list_global, root); /* Remove the object from all objects' DAG lists. */ STAILQ_FOREACH(elm, &root->dagmembers, link) { objlist_remove(&elm->obj->dldags, root); if (elm->obj != root) unlink_object(elm->obj); } } } static void ref_dag(Obj_Entry *root) { Objlist_Entry *elm; assert(root->dag_inited); STAILQ_FOREACH(elm, &root->dagmembers, link) elm->obj->refcount++; } static void unref_dag(Obj_Entry *root) { Objlist_Entry *elm; assert(root->dag_inited); STAILQ_FOREACH(elm, &root->dagmembers, link) elm->obj->refcount--; } /* * Common code for MD __tls_get_addr(). */ static void *tls_get_addr_slow(Elf_Addr **, int, size_t) __noinline; static void * tls_get_addr_slow(Elf_Addr **dtvp, int index, size_t offset) { Elf_Addr *newdtv, *dtv; RtldLockState lockstate; int to_copy; dtv = *dtvp; /* Check dtv generation in case new modules have arrived */ if (dtv[0] != tls_dtv_generation) { wlock_acquire(rtld_bind_lock, &lockstate); newdtv = xcalloc(tls_max_index + 2, sizeof(Elf_Addr)); to_copy = dtv[1]; if (to_copy > tls_max_index) to_copy = tls_max_index; memcpy(&newdtv[2], &dtv[2], to_copy * sizeof(Elf_Addr)); newdtv[0] = tls_dtv_generation; newdtv[1] = tls_max_index; free(dtv); lock_release(rtld_bind_lock, &lockstate); dtv = *dtvp = newdtv; } /* Dynamically allocate module TLS if necessary */ if (dtv[index + 1] == 0) { /* Signal safe, wlock will block out signals. */ wlock_acquire(rtld_bind_lock, &lockstate); if (!dtv[index + 1]) dtv[index + 1] = (Elf_Addr)allocate_module_tls(index); lock_release(rtld_bind_lock, &lockstate); } return ((void *)(dtv[index + 1] + offset)); } void * tls_get_addr_common(Elf_Addr **dtvp, int index, size_t offset) { Elf_Addr *dtv; dtv = *dtvp; /* Check dtv generation in case new modules have arrived */ if (__predict_true(dtv[0] == tls_dtv_generation && dtv[index + 1] != 0)) return ((void *)(dtv[index + 1] + offset)); return (tls_get_addr_slow(dtvp, index, offset)); } #if defined(__aarch64__) || defined(__arm__) || defined(__mips__) || \ defined(__powerpc__) || defined(__riscv) /* * Return pointer to allocated TLS block */ static void * get_tls_block_ptr(void *tcb, size_t tcbsize) { size_t extra_size, post_size, pre_size, tls_block_size; size_t tls_init_align; tls_init_align = MAX(obj_main->tlsalign, 1); /* Compute fragments sizes. */ extra_size = tcbsize - TLS_TCB_SIZE; post_size = calculate_tls_post_size(tls_init_align); tls_block_size = tcbsize + post_size; pre_size = roundup2(tls_block_size, tls_init_align) - tls_block_size; return ((char *)tcb - pre_size - extra_size); } /* * Allocate Static TLS using the Variant I method. * * For details on the layout, see lib/libc/gen/tls.c. * * NB: rtld's tls_static_space variable includes TLS_TCB_SIZE and post_size as * it is based on tls_last_offset, and TLS offsets here are really TCB * offsets, whereas libc's tls_static_space is just the executable's static * TLS segment. */ void * allocate_tls(Obj_Entry *objs, void *oldtcb, size_t tcbsize, size_t tcbalign) { Obj_Entry *obj; char *tls_block; Elf_Addr *dtv, **tcb; Elf_Addr addr; Elf_Addr i; size_t extra_size, maxalign, post_size, pre_size, tls_block_size; size_t tls_init_align; if (oldtcb != NULL && tcbsize == TLS_TCB_SIZE) return (oldtcb); assert(tcbsize >= TLS_TCB_SIZE); maxalign = MAX(tcbalign, tls_static_max_align); tls_init_align = MAX(obj_main->tlsalign, 1); /* Compute fragmets sizes. */ extra_size = tcbsize - TLS_TCB_SIZE; post_size = calculate_tls_post_size(tls_init_align); tls_block_size = tcbsize + post_size; pre_size = roundup2(tls_block_size, tls_init_align) - tls_block_size; tls_block_size += pre_size + tls_static_space - TLS_TCB_SIZE - post_size; /* Allocate whole TLS block */ tls_block = malloc_aligned(tls_block_size, maxalign); tcb = (Elf_Addr **)(tls_block + pre_size + extra_size); if (oldtcb != NULL) { memcpy(tls_block, get_tls_block_ptr(oldtcb, tcbsize), tls_static_space); free_aligned(get_tls_block_ptr(oldtcb, tcbsize)); /* Adjust the DTV. */ dtv = tcb[0]; for (i = 0; i < dtv[1]; i++) { if (dtv[i+2] >= (Elf_Addr)oldtcb && dtv[i+2] < (Elf_Addr)oldtcb + tls_static_space) { dtv[i+2] = dtv[i+2] - (Elf_Addr)oldtcb + (Elf_Addr)tcb; } } } else { dtv = xcalloc(tls_max_index + 2, sizeof(Elf_Addr)); tcb[0] = dtv; dtv[0] = tls_dtv_generation; dtv[1] = tls_max_index; for (obj = globallist_curr(objs); obj != NULL; obj = globallist_next(obj)) { if (obj->tlsoffset > 0) { addr = (Elf_Addr)tcb + obj->tlsoffset; if (obj->tlsinitsize > 0) memcpy((void*) addr, obj->tlsinit, obj->tlsinitsize); if (obj->tlssize > obj->tlsinitsize) memset((void*)(addr + obj->tlsinitsize), 0, obj->tlssize - obj->tlsinitsize); dtv[obj->tlsindex + 1] = addr; } } } return (tcb); } void free_tls(void *tcb, size_t tcbsize, size_t tcbalign __unused) { Elf_Addr *dtv; Elf_Addr tlsstart, tlsend; size_t post_size; size_t dtvsize, i, tls_init_align; assert(tcbsize >= TLS_TCB_SIZE); tls_init_align = MAX(obj_main->tlsalign, 1); /* Compute fragments sizes. */ post_size = calculate_tls_post_size(tls_init_align); tlsstart = (Elf_Addr)tcb + TLS_TCB_SIZE + post_size; tlsend = (Elf_Addr)tcb + tls_static_space; dtv = *(Elf_Addr **)tcb; dtvsize = dtv[1]; for (i = 0; i < dtvsize; i++) { if (dtv[i+2] && (dtv[i+2] < tlsstart || dtv[i+2] >= tlsend)) { free((void*)dtv[i+2]); } } free(dtv); free_aligned(get_tls_block_ptr(tcb, tcbsize)); } #endif #if defined(__i386__) || defined(__amd64__) || defined(__sparc64__) /* * Allocate Static TLS using the Variant II method. */ void * allocate_tls(Obj_Entry *objs, void *oldtls, size_t tcbsize, size_t tcbalign) { Obj_Entry *obj; size_t size, ralign; char *tls; Elf_Addr *dtv, *olddtv; Elf_Addr segbase, oldsegbase, addr; size_t i; ralign = tcbalign; if (tls_static_max_align > ralign) ralign = tls_static_max_align; size = round(tls_static_space, ralign) + round(tcbsize, ralign); assert(tcbsize >= 2*sizeof(Elf_Addr)); tls = malloc_aligned(size, ralign); dtv = xcalloc(tls_max_index + 2, sizeof(Elf_Addr)); segbase = (Elf_Addr)(tls + round(tls_static_space, ralign)); ((Elf_Addr*)segbase)[0] = segbase; ((Elf_Addr*)segbase)[1] = (Elf_Addr) dtv; dtv[0] = tls_dtv_generation; dtv[1] = tls_max_index; if (oldtls) { /* * Copy the static TLS block over whole. */ oldsegbase = (Elf_Addr) oldtls; memcpy((void *)(segbase - tls_static_space), (const void *)(oldsegbase - tls_static_space), tls_static_space); /* * If any dynamic TLS blocks have been created tls_get_addr(), * move them over. */ olddtv = ((Elf_Addr**)oldsegbase)[1]; for (i = 0; i < olddtv[1]; i++) { if (olddtv[i+2] < oldsegbase - size || olddtv[i+2] > oldsegbase) { dtv[i+2] = olddtv[i+2]; olddtv[i+2] = 0; } } /* * We assume that this block was the one we created with * allocate_initial_tls(). */ free_tls(oldtls, 2*sizeof(Elf_Addr), sizeof(Elf_Addr)); } else { for (obj = objs; obj != NULL; obj = TAILQ_NEXT(obj, next)) { if (obj->marker || obj->tlsoffset == 0) continue; addr = segbase - obj->tlsoffset; memset((void*)(addr + obj->tlsinitsize), 0, obj->tlssize - obj->tlsinitsize); if (obj->tlsinit) { memcpy((void*) addr, obj->tlsinit, obj->tlsinitsize); obj->static_tls_copied = true; } dtv[obj->tlsindex + 1] = addr; } } return (void*) segbase; } void free_tls(void *tls, size_t tcbsize __unused, size_t tcbalign) { Elf_Addr* dtv; size_t size, ralign; int dtvsize, i; Elf_Addr tlsstart, tlsend; /* * Figure out the size of the initial TLS block so that we can * find stuff which ___tls_get_addr() allocated dynamically. */ ralign = tcbalign; if (tls_static_max_align > ralign) ralign = tls_static_max_align; size = round(tls_static_space, ralign); dtv = ((Elf_Addr**)tls)[1]; dtvsize = dtv[1]; tlsend = (Elf_Addr) tls; tlsstart = tlsend - size; for (i = 0; i < dtvsize; i++) { if (dtv[i + 2] != 0 && (dtv[i + 2] < tlsstart || dtv[i + 2] > tlsend)) { free_aligned((void *)dtv[i + 2]); } } free_aligned((void *)tlsstart); free((void*) dtv); } #endif /* * Allocate TLS block for module with given index. */ void * allocate_module_tls(int index) { Obj_Entry* obj; char* p; TAILQ_FOREACH(obj, &obj_list, next) { if (obj->marker) continue; if (obj->tlsindex == index) break; } if (!obj) { _rtld_error("Can't find module with TLS index %d", index); rtld_die(); } p = malloc_aligned(obj->tlssize, obj->tlsalign); memcpy(p, obj->tlsinit, obj->tlsinitsize); memset(p + obj->tlsinitsize, 0, obj->tlssize - obj->tlsinitsize); return p; } bool allocate_tls_offset(Obj_Entry *obj) { size_t off; if (obj->tls_done) return true; if (obj->tlssize == 0) { obj->tls_done = true; return true; } if (tls_last_offset == 0) off = calculate_first_tls_offset(obj->tlssize, obj->tlsalign); else off = calculate_tls_offset(tls_last_offset, tls_last_size, obj->tlssize, obj->tlsalign); /* * If we have already fixed the size of the static TLS block, we * must stay within that size. When allocating the static TLS, we * leave a small amount of space spare to be used for dynamically * loading modules which use static TLS. */ if (tls_static_space != 0) { if (calculate_tls_end(off, obj->tlssize) > tls_static_space) return false; } else if (obj->tlsalign > tls_static_max_align) { tls_static_max_align = obj->tlsalign; } tls_last_offset = obj->tlsoffset = off; tls_last_size = obj->tlssize; obj->tls_done = true; return true; } void free_tls_offset(Obj_Entry *obj) { /* * If we were the last thing to allocate out of the static TLS * block, we give our space back to the 'allocator'. This is a * simplistic workaround to allow libGL.so.1 to be loaded and * unloaded multiple times. */ if (calculate_tls_end(obj->tlsoffset, obj->tlssize) == calculate_tls_end(tls_last_offset, tls_last_size)) { tls_last_offset -= obj->tlssize; tls_last_size = 0; } } void * _rtld_allocate_tls(void *oldtls, size_t tcbsize, size_t tcbalign) { void *ret; RtldLockState lockstate; wlock_acquire(rtld_bind_lock, &lockstate); ret = allocate_tls(globallist_curr(TAILQ_FIRST(&obj_list)), oldtls, tcbsize, tcbalign); lock_release(rtld_bind_lock, &lockstate); return (ret); } void _rtld_free_tls(void *tcb, size_t tcbsize, size_t tcbalign) { RtldLockState lockstate; wlock_acquire(rtld_bind_lock, &lockstate); free_tls(tcb, tcbsize, tcbalign); lock_release(rtld_bind_lock, &lockstate); } static void object_add_name(Obj_Entry *obj, const char *name) { Name_Entry *entry; size_t len; len = strlen(name); entry = malloc(sizeof(Name_Entry) + len); if (entry != NULL) { strcpy(entry->name, name); STAILQ_INSERT_TAIL(&obj->names, entry, link); } } static int object_match_name(const Obj_Entry *obj, const char *name) { Name_Entry *entry; STAILQ_FOREACH(entry, &obj->names, link) { if (strcmp(name, entry->name) == 0) return (1); } return (0); } static Obj_Entry * locate_dependency(const Obj_Entry *obj, const char *name) { const Objlist_Entry *entry; const Needed_Entry *needed; STAILQ_FOREACH(entry, &list_main, link) { if (object_match_name(entry->obj, name)) return entry->obj; } for (needed = obj->needed; needed != NULL; needed = needed->next) { if (strcmp(obj->strtab + needed->name, name) == 0 || (needed->obj != NULL && object_match_name(needed->obj, name))) { /* * If there is DT_NEEDED for the name we are looking for, * we are all set. Note that object might not be found if * dependency was not loaded yet, so the function can * return NULL here. This is expected and handled * properly by the caller. */ return (needed->obj); } } _rtld_error("%s: Unexpected inconsistency: dependency %s not found", obj->path, name); rtld_die(); } static int check_object_provided_version(Obj_Entry *refobj, const Obj_Entry *depobj, const Elf_Vernaux *vna) { const Elf_Verdef *vd; const char *vername; vername = refobj->strtab + vna->vna_name; vd = depobj->verdef; if (vd == NULL) { _rtld_error("%s: version %s required by %s not defined", depobj->path, vername, refobj->path); return (-1); } for (;;) { if (vd->vd_version != VER_DEF_CURRENT) { _rtld_error("%s: Unsupported version %d of Elf_Verdef entry", depobj->path, vd->vd_version); return (-1); } if (vna->vna_hash == vd->vd_hash) { const Elf_Verdaux *aux = (const Elf_Verdaux *) ((const char *)vd + vd->vd_aux); if (strcmp(vername, depobj->strtab + aux->vda_name) == 0) return (0); } if (vd->vd_next == 0) break; vd = (const Elf_Verdef *)((const char *)vd + vd->vd_next); } if (vna->vna_flags & VER_FLG_WEAK) return (0); _rtld_error("%s: version %s required by %s not found", depobj->path, vername, refobj->path); return (-1); } static int rtld_verify_object_versions(Obj_Entry *obj) { const Elf_Verneed *vn; const Elf_Verdef *vd; const Elf_Verdaux *vda; const Elf_Vernaux *vna; const Obj_Entry *depobj; int maxvernum, vernum; if (obj->ver_checked) return (0); obj->ver_checked = true; maxvernum = 0; /* * Walk over defined and required version records and figure out * max index used by any of them. Do very basic sanity checking * while there. */ vn = obj->verneed; while (vn != NULL) { if (vn->vn_version != VER_NEED_CURRENT) { _rtld_error("%s: Unsupported version %d of Elf_Verneed entry", obj->path, vn->vn_version); return (-1); } vna = (const Elf_Vernaux *)((const char *)vn + vn->vn_aux); for (;;) { vernum = VER_NEED_IDX(vna->vna_other); if (vernum > maxvernum) maxvernum = vernum; if (vna->vna_next == 0) break; vna = (const Elf_Vernaux *)((const char *)vna + vna->vna_next); } if (vn->vn_next == 0) break; vn = (const Elf_Verneed *)((const char *)vn + vn->vn_next); } vd = obj->verdef; while (vd != NULL) { if (vd->vd_version != VER_DEF_CURRENT) { _rtld_error("%s: Unsupported version %d of Elf_Verdef entry", obj->path, vd->vd_version); return (-1); } vernum = VER_DEF_IDX(vd->vd_ndx); if (vernum > maxvernum) maxvernum = vernum; if (vd->vd_next == 0) break; vd = (const Elf_Verdef *)((const char *)vd + vd->vd_next); } if (maxvernum == 0) return (0); /* * Store version information in array indexable by version index. * Verify that object version requirements are satisfied along the * way. */ obj->vernum = maxvernum + 1; obj->vertab = xcalloc(obj->vernum, sizeof(Ver_Entry)); vd = obj->verdef; while (vd != NULL) { if ((vd->vd_flags & VER_FLG_BASE) == 0) { vernum = VER_DEF_IDX(vd->vd_ndx); assert(vernum <= maxvernum); vda = (const Elf_Verdaux *)((const char *)vd + vd->vd_aux); obj->vertab[vernum].hash = vd->vd_hash; obj->vertab[vernum].name = obj->strtab + vda->vda_name; obj->vertab[vernum].file = NULL; obj->vertab[vernum].flags = 0; } if (vd->vd_next == 0) break; vd = (const Elf_Verdef *)((const char *)vd + vd->vd_next); } vn = obj->verneed; while (vn != NULL) { depobj = locate_dependency(obj, obj->strtab + vn->vn_file); if (depobj == NULL) return (-1); vna = (const Elf_Vernaux *)((const char *)vn + vn->vn_aux); for (;;) { if (check_object_provided_version(obj, depobj, vna)) return (-1); vernum = VER_NEED_IDX(vna->vna_other); assert(vernum <= maxvernum); obj->vertab[vernum].hash = vna->vna_hash; obj->vertab[vernum].name = obj->strtab + vna->vna_name; obj->vertab[vernum].file = obj->strtab + vn->vn_file; obj->vertab[vernum].flags = (vna->vna_other & VER_NEED_HIDDEN) ? VER_INFO_HIDDEN : 0; if (vna->vna_next == 0) break; vna = (const Elf_Vernaux *)((const char *)vna + vna->vna_next); } if (vn->vn_next == 0) break; vn = (const Elf_Verneed *)((const char *)vn + vn->vn_next); } return 0; } static int rtld_verify_versions(const Objlist *objlist) { Objlist_Entry *entry; int rc; rc = 0; STAILQ_FOREACH(entry, objlist, link) { /* * Skip dummy objects or objects that have their version requirements * already checked. */ if (entry->obj->strtab == NULL || entry->obj->vertab != NULL) continue; if (rtld_verify_object_versions(entry->obj) == -1) { rc = -1; if (ld_tracing == NULL) break; } } if (rc == 0 || ld_tracing != NULL) rc = rtld_verify_object_versions(&obj_rtld); return rc; } const Ver_Entry * fetch_ventry(const Obj_Entry *obj, unsigned long symnum) { Elf_Versym vernum; if (obj->vertab) { vernum = VER_NDX(obj->versyms[symnum]); if (vernum >= obj->vernum) { _rtld_error("%s: symbol %s has wrong verneed value %d", obj->path, obj->strtab + symnum, vernum); } else if (obj->vertab[vernum].hash != 0) { return &obj->vertab[vernum]; } } return NULL; } int _rtld_get_stack_prot(void) { return (stack_prot); } int _rtld_is_dlopened(void *arg) { Obj_Entry *obj; RtldLockState lockstate; int res; rlock_acquire(rtld_bind_lock, &lockstate); obj = dlcheck(arg); if (obj == NULL) obj = obj_from_addr(arg); if (obj == NULL) { _rtld_error("No shared object contains address"); lock_release(rtld_bind_lock, &lockstate); return (-1); } res = obj->dlopened ? 1 : 0; lock_release(rtld_bind_lock, &lockstate); return (res); } static int obj_remap_relro(Obj_Entry *obj, int prot) { if (obj->relro_size > 0 && mprotect(obj->relro_page, obj->relro_size, prot) == -1) { _rtld_error("%s: Cannot set relro protection to %#x: %s", obj->path, prot, rtld_strerror(errno)); return (-1); } return (0); } static int obj_disable_relro(Obj_Entry *obj) { return (obj_remap_relro(obj, PROT_READ | PROT_WRITE)); } static int obj_enforce_relro(Obj_Entry *obj) { return (obj_remap_relro(obj, PROT_READ)); } static void map_stacks_exec(RtldLockState *lockstate) { void (*thr_map_stacks_exec)(void); if ((max_stack_flags & PF_X) == 0 || (stack_prot & PROT_EXEC) != 0) return; thr_map_stacks_exec = (void (*)(void))(uintptr_t) get_program_var_addr("__pthread_map_stacks_exec", lockstate); if (thr_map_stacks_exec != NULL) { stack_prot |= PROT_EXEC; thr_map_stacks_exec(); } } static void distribute_static_tls(Objlist *list, RtldLockState *lockstate) { Objlist_Entry *elm; Obj_Entry *obj; void (*distrib)(size_t, void *, size_t, size_t); distrib = (void (*)(size_t, void *, size_t, size_t))(uintptr_t) get_program_var_addr("__pthread_distribute_static_tls", lockstate); if (distrib == NULL) return; STAILQ_FOREACH(elm, list, link) { obj = elm->obj; if (obj->marker || !obj->tls_done || obj->static_tls_copied) continue; distrib(obj->tlsoffset, obj->tlsinit, obj->tlsinitsize, obj->tlssize); obj->static_tls_copied = true; } } void symlook_init(SymLook *dst, const char *name) { bzero(dst, sizeof(*dst)); dst->name = name; dst->hash = elf_hash(name); dst->hash_gnu = gnu_hash(name); } static void symlook_init_from_req(SymLook *dst, const SymLook *src) { dst->name = src->name; dst->hash = src->hash; dst->hash_gnu = src->hash_gnu; dst->ventry = src->ventry; dst->flags = src->flags; dst->defobj_out = NULL; dst->sym_out = NULL; dst->lockstate = src->lockstate; } static int open_binary_fd(const char *argv0, bool search_in_path) { char *pathenv, *pe, binpath[PATH_MAX]; int fd; if (search_in_path && strchr(argv0, '/') == NULL) { pathenv = getenv("PATH"); if (pathenv == NULL) { _rtld_error("-p and no PATH environment variable"); rtld_die(); } pathenv = strdup(pathenv); if (pathenv == NULL) { _rtld_error("Cannot allocate memory"); rtld_die(); } fd = -1; errno = ENOENT; while ((pe = strsep(&pathenv, ":")) != NULL) { if (strlcpy(binpath, pe, sizeof(binpath)) >= sizeof(binpath)) continue; if (binpath[0] != '\0' && strlcat(binpath, "/", sizeof(binpath)) >= sizeof(binpath)) continue; if (strlcat(binpath, argv0, sizeof(binpath)) >= sizeof(binpath)) continue; fd = open(binpath, O_RDONLY | O_CLOEXEC | O_VERIFY); if (fd != -1 || errno != ENOENT) break; } free(pathenv); } else { fd = open(argv0, O_RDONLY | O_CLOEXEC | O_VERIFY); } if (fd == -1) { _rtld_error("Cannot open %s: %s", argv0, rtld_strerror(errno)); rtld_die(); } return (fd); } /* * Parse a set of command-line arguments. */ static int parse_args(char* argv[], int argc, bool *use_pathp, int *fdp) { const char *arg; int fd, i, j, arglen; char opt; dbg("Parsing command-line arguments"); *use_pathp = false; *fdp = -1; for (i = 1; i < argc; i++ ) { arg = argv[i]; dbg("argv[%d]: '%s'", i, arg); /* * rtld arguments end with an explicit "--" or with the first * non-prefixed argument. */ if (strcmp(arg, "--") == 0) { i++; break; } if (arg[0] != '-') break; /* * All other arguments are single-character options that can * be combined, so we need to search through `arg` for them. */ arglen = strlen(arg); for (j = 1; j < arglen; j++) { opt = arg[j]; if (opt == 'h') { print_usage(argv[0]); _exit(0); } else if (opt == 'f') { /* * -f XX can be used to specify a descriptor for the * binary named at the command line (i.e., the later * argument will specify the process name but the * descriptor is what will actually be executed) */ if (j != arglen - 1) { /* -f must be the last option in, e.g., -abcf */ _rtld_error("Invalid options: %s", arg); rtld_die(); } i++; fd = parse_integer(argv[i]); if (fd == -1) { _rtld_error("Invalid file descriptor: '%s'", argv[i]); rtld_die(); } *fdp = fd; break; } else if (opt == 'p') { *use_pathp = true; } else { _rtld_error("Invalid argument: '%s'", arg); print_usage(argv[0]); rtld_die(); } } } return (i); } /* * Parse a file descriptor number without pulling in more of libc (e.g. atoi). */ static int parse_integer(const char *str) { static const int RADIX = 10; /* XXXJA: possibly support hex? */ const char *orig; int n; char c; orig = str; n = 0; for (c = *str; c != '\0'; c = *++str) { if (c < '0' || c > '9') return (-1); n *= RADIX; n += c - '0'; } /* Make sure we actually parsed something. */ if (str == orig) return (-1); return (n); } static void print_usage(const char *argv0) { rtld_printf("Usage: %s [-h] [-f ] [--] []\n" "\n" "Options:\n" " -h Display this help message\n" " -p Search in PATH for named binary\n" " -f Execute instead of searching for \n" " -- End of RTLD options\n" " Name of process to execute\n" " Arguments to the executed process\n", argv0); } /* * Overrides for libc_pic-provided functions. */ int __getosreldate(void) { size_t len; int oid[2]; int error, osrel; if (osreldate != 0) return (osreldate); oid[0] = CTL_KERN; oid[1] = KERN_OSRELDATE; osrel = 0; len = sizeof(osrel); error = sysctl(oid, 2, &osrel, &len, NULL, 0); if (error == 0 && osrel > 0 && len == sizeof(osrel)) osreldate = osrel; return (osreldate); } - -void -exit(int status) -{ - - _exit(status); -} - -void (*__cleanup)(void); -int __isthreaded = 0; -int _thread_autoinit_dummy_decl = 1; - -/* - * No unresolved symbols for rtld. - */ -void -__pthread_cxa_finalize(struct dl_phdr_info *a __unused) -{ -} - const char * rtld_strerror(int errnum) { if (errnum < 0 || errnum >= sys_nerr) return ("Unknown error"); return (sys_errlist[errnum]); } /* * No ifunc relocations. */ void * memset(void *dest, int c, size_t len) { size_t i; for (i = 0; i < len; i++) ((char *)dest)[i] = c; return (dest); } void bzero(void *dest, size_t len) { size_t i; for (i = 0; i < len; i++) ((char *)dest)[i] = 0; } /* malloc */ void * malloc(size_t nbytes) { return (__crt_malloc(nbytes)); } void * calloc(size_t num, size_t size) { return (__crt_calloc(num, size)); } void free(void *cp) { __crt_free(cp); } void * realloc(void *cp, size_t nbytes) { return (__crt_realloc(cp, nbytes)); } Index: head/libexec/rtld-elf/rtld_lock.c =================================================================== --- head/libexec/rtld-elf/rtld_lock.c (revision 349553) +++ head/libexec/rtld-elf/rtld_lock.c (revision 349554) @@ -1,411 +1,412 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright 1999, 2000 John D. Polstra. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * from: FreeBSD: src/libexec/rtld-elf/sparc64/lockdflt.c,v 1.3 2002/10/09 * $FreeBSD$ */ /* * Thread locking implementation for the dynamic linker. * * We use the "simple, non-scalable reader-preference lock" from: * * J. M. Mellor-Crummey and M. L. Scott. "Scalable Reader-Writer * Synchronization for Shared-Memory Multiprocessors." 3rd ACM Symp. on * Principles and Practice of Parallel Programming, April 1991. * * In this algorithm the lock is a single word. Its low-order bit is * set when a writer holds the lock. The remaining high-order bits * contain a count of readers desiring the lock. The algorithm requires * atomic "compare_and_store" and "add" operations, which we take * from machine/atomic.h. */ #include #include #include #include #include "debug.h" #include "rtld.h" #include "rtld_machdep.h" +#include "rtld_libc.h" void _rtld_thread_init(struct RtldLockInfo *) __exported; void _rtld_atfork_pre(int *) __exported; void _rtld_atfork_post(int *) __exported; #define WAFLAG 0x1 /* A writer holds the lock */ #define RC_INCR 0x2 /* Adjusts count of readers desiring lock */ typedef struct Struct_Lock { volatile u_int lock; void *base; } Lock; static sigset_t fullsigmask, oldsigmask; static int thread_flag, wnested; static void * def_lock_create(void) { void *base; char *p; uintptr_t r; Lock *l; /* * Arrange for the lock to occupy its own cache line. First, we * optimistically allocate just a cache line, hoping that malloc * will give us a well-aligned block of memory. If that doesn't * work, we allocate a larger block and take a well-aligned cache * line from it. */ base = xmalloc(CACHE_LINE_SIZE); p = (char *)base; if ((uintptr_t)p % CACHE_LINE_SIZE != 0) { free(base); base = xmalloc(2 * CACHE_LINE_SIZE); p = (char *)base; if ((r = (uintptr_t)p % CACHE_LINE_SIZE) != 0) p += CACHE_LINE_SIZE - r; } l = (Lock *)p; l->base = base; l->lock = 0; return l; } static void def_lock_destroy(void *lock) { Lock *l = (Lock *)lock; free(l->base); } static void def_rlock_acquire(void *lock) { Lock *l = (Lock *)lock; atomic_add_acq_int(&l->lock, RC_INCR); while (l->lock & WAFLAG) ; /* Spin */ } static void def_wlock_acquire(void *lock) { Lock *l; sigset_t tmp_oldsigmask; l = (Lock *)lock; for (;;) { sigprocmask(SIG_BLOCK, &fullsigmask, &tmp_oldsigmask); if (atomic_cmpset_acq_int(&l->lock, 0, WAFLAG)) break; sigprocmask(SIG_SETMASK, &tmp_oldsigmask, NULL); } if (atomic_fetchadd_int(&wnested, 1) == 0) oldsigmask = tmp_oldsigmask; } static void def_lock_release(void *lock) { Lock *l; l = (Lock *)lock; if ((l->lock & WAFLAG) == 0) atomic_add_rel_int(&l->lock, -RC_INCR); else { assert(wnested > 0); atomic_add_rel_int(&l->lock, -WAFLAG); if (atomic_fetchadd_int(&wnested, -1) == 1) sigprocmask(SIG_SETMASK, &oldsigmask, NULL); } } static int def_thread_set_flag(int mask) { int old_val = thread_flag; thread_flag |= mask; return (old_val); } static int def_thread_clr_flag(int mask) { int old_val = thread_flag; thread_flag &= ~mask; return (old_val); } /* * Public interface exposed to the rest of the dynamic linker. */ static struct RtldLockInfo lockinfo; static struct RtldLockInfo deflockinfo; static __inline int thread_mask_set(int mask) { return lockinfo.thread_set_flag(mask); } static __inline void thread_mask_clear(int mask) { lockinfo.thread_clr_flag(mask); } #define RTLD_LOCK_CNT 3 static struct rtld_lock { void *handle; int mask; } rtld_locks[RTLD_LOCK_CNT]; rtld_lock_t rtld_bind_lock = &rtld_locks[0]; rtld_lock_t rtld_libc_lock = &rtld_locks[1]; rtld_lock_t rtld_phdr_lock = &rtld_locks[2]; void rlock_acquire(rtld_lock_t lock, RtldLockState *lockstate) { if (lockstate == NULL) return; if (thread_mask_set(lock->mask) & lock->mask) { dbg("rlock_acquire: recursed"); lockstate->lockstate = RTLD_LOCK_UNLOCKED; return; } lockinfo.rlock_acquire(lock->handle); lockstate->lockstate = RTLD_LOCK_RLOCKED; } void wlock_acquire(rtld_lock_t lock, RtldLockState *lockstate) { if (lockstate == NULL) return; if (thread_mask_set(lock->mask) & lock->mask) { dbg("wlock_acquire: recursed"); lockstate->lockstate = RTLD_LOCK_UNLOCKED; return; } lockinfo.wlock_acquire(lock->handle); lockstate->lockstate = RTLD_LOCK_WLOCKED; } void lock_release(rtld_lock_t lock, RtldLockState *lockstate) { if (lockstate == NULL) return; switch (lockstate->lockstate) { case RTLD_LOCK_UNLOCKED: break; case RTLD_LOCK_RLOCKED: case RTLD_LOCK_WLOCKED: thread_mask_clear(lock->mask); lockinfo.lock_release(lock->handle); break; default: assert(0); } } void lock_upgrade(rtld_lock_t lock, RtldLockState *lockstate) { if (lockstate == NULL) return; lock_release(lock, lockstate); wlock_acquire(lock, lockstate); } void lock_restart_for_upgrade(RtldLockState *lockstate) { if (lockstate == NULL) return; switch (lockstate->lockstate) { case RTLD_LOCK_UNLOCKED: case RTLD_LOCK_WLOCKED: break; case RTLD_LOCK_RLOCKED: siglongjmp(lockstate->env, 1); break; default: assert(0); } } void lockdflt_init(void) { int i; deflockinfo.rtli_version = RTLI_VERSION; deflockinfo.lock_create = def_lock_create; deflockinfo.lock_destroy = def_lock_destroy; deflockinfo.rlock_acquire = def_rlock_acquire; deflockinfo.wlock_acquire = def_wlock_acquire; deflockinfo.lock_release = def_lock_release; deflockinfo.thread_set_flag = def_thread_set_flag; deflockinfo.thread_clr_flag = def_thread_clr_flag; deflockinfo.at_fork = NULL; for (i = 0; i < RTLD_LOCK_CNT; i++) { rtld_locks[i].mask = (1 << i); rtld_locks[i].handle = NULL; } memcpy(&lockinfo, &deflockinfo, sizeof(lockinfo)); _rtld_thread_init(NULL); /* * Construct a mask to block all signals except traps which might * conceivably be generated within the dynamic linker itself. */ sigfillset(&fullsigmask); sigdelset(&fullsigmask, SIGILL); sigdelset(&fullsigmask, SIGTRAP); sigdelset(&fullsigmask, SIGABRT); sigdelset(&fullsigmask, SIGEMT); sigdelset(&fullsigmask, SIGFPE); sigdelset(&fullsigmask, SIGBUS); sigdelset(&fullsigmask, SIGSEGV); sigdelset(&fullsigmask, SIGSYS); } /* * Callback function to allow threads implementation to * register their own locking primitives if the default * one is not suitable. * The current context should be the only context * executing at the invocation time. */ void _rtld_thread_init(struct RtldLockInfo *pli) { int flags, i; void *locks[RTLD_LOCK_CNT]; /* disable all locking while this function is running */ flags = thread_mask_set(~0); if (pli == NULL) pli = &deflockinfo; for (i = 0; i < RTLD_LOCK_CNT; i++) if ((locks[i] = pli->lock_create()) == NULL) break; if (i < RTLD_LOCK_CNT) { while (--i >= 0) pli->lock_destroy(locks[i]); abort(); } for (i = 0; i < RTLD_LOCK_CNT; i++) { if (rtld_locks[i].handle == NULL) continue; if (flags & rtld_locks[i].mask) lockinfo.lock_release(rtld_locks[i].handle); lockinfo.lock_destroy(rtld_locks[i].handle); } for (i = 0; i < RTLD_LOCK_CNT; i++) { rtld_locks[i].handle = locks[i]; if (flags & rtld_locks[i].mask) pli->wlock_acquire(rtld_locks[i].handle); } lockinfo.lock_create = pli->lock_create; lockinfo.lock_destroy = pli->lock_destroy; lockinfo.rlock_acquire = pli->rlock_acquire; lockinfo.wlock_acquire = pli->wlock_acquire; lockinfo.lock_release = pli->lock_release; lockinfo.thread_set_flag = pli->thread_set_flag; lockinfo.thread_clr_flag = pli->thread_clr_flag; lockinfo.at_fork = pli->at_fork; /* restore thread locking state, this time with new locks */ thread_mask_clear(~0); thread_mask_set(flags); dbg("_rtld_thread_init: done"); } void _rtld_atfork_pre(int *locks) { RtldLockState ls[2]; if (locks == NULL) return; /* * Warning: this did not worked well with the rtld compat * locks above, when the thread signal mask was corrupted (set * to all signals blocked) if two locks were taken * simultaneously in the write mode. The caller of the * _rtld_atfork_pre() must provide the working implementation * of the locks anyway, and libthr locks are fine. */ wlock_acquire(rtld_phdr_lock, &ls[0]); wlock_acquire(rtld_bind_lock, &ls[1]); /* XXXKIB: I am really sorry for this. */ locks[0] = ls[1].lockstate; locks[2] = ls[0].lockstate; } void _rtld_atfork_post(int *locks) { RtldLockState ls[2]; if (locks == NULL) return; bzero(ls, sizeof(ls)); ls[0].lockstate = locks[2]; ls[1].lockstate = locks[0]; lock_release(rtld_bind_lock, &ls[1]); lock_release(rtld_phdr_lock, &ls[0]); } Index: head/libexec/rtld-elf/rtld_printf.c =================================================================== --- head/libexec/rtld-elf/rtld_printf.c (revision 349553) +++ head/libexec/rtld-elf/rtld_printf.c (revision 349554) @@ -1,505 +1,506 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1986, 1988, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * Copyright (c) 2011 Konstantin Belousov * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include #include #include #include #include #include #include "rtld_printf.h" +#include "rtld_libc.h" #define MAXNBUF (sizeof(intmax_t) * NBBY + 1) #define PRINT_METHOD_SNPRINTF 1 #define PRINT_METHOD_WRITE 2 struct snprintf_arg { int method; char *str; char *buf; size_t remain; size_t buf_total; int fd; }; static void printf_out(struct snprintf_arg *info) { if (info->remain == info->buf_total) return; write(info->fd, info->buf, info->buf_total - info->remain); info->str = info->buf; info->remain = info->buf_total; } static void snprintf_func(int ch, struct snprintf_arg *const info) { switch (info->method) { case PRINT_METHOD_SNPRINTF: if (info->remain >= 2) { *info->str++ = ch; info->remain--; } break; case PRINT_METHOD_WRITE: if (info->remain > 0) { *info->str++ = ch; info->remain--; } else printf_out(info); break; } } static char const hex2ascii_lower[] = "0123456789abcdefghijklmnopqrstuvwxyz"; static char const hex2ascii_upper[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; #define hex2ascii(hex) (hex2ascii_lower[hex]) #define hex2ascii_upper(hex) (hex2ascii_upper[hex]) static __inline int imax(int a, int b) { return (a > b ? a : b); } static char * ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) { char *p, c; p = nbuf; *p = '\0'; do { c = upper ? hex2ascii_upper(num % base) : hex2ascii(num % base); *++p = c; } while (num /= base); if (lenp) *lenp = p - nbuf; return (p); } static int kvprintf(char const *fmt, struct snprintf_arg *arg, int radix, va_list ap) { #define PCHAR(c) snprintf_func((c), arg) char nbuf[MAXNBUF]; const char *p, *percent, *q; u_char *up; int ch, n; uintmax_t num; int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; int cflag, hflag, jflag, tflag, zflag; int dwidth, upper; char padc; int stop = 0, retval = 0; num = 0; if (fmt == NULL) fmt = "(fmt null)\n"; if (radix < 2 || radix > 36) radix = 10; for (;;) { padc = ' '; width = 0; while ((ch = (u_char)*fmt++) != '%' || stop) { if (ch == '\0') return (retval); PCHAR(ch); } percent = fmt - 1; qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; sign = 0; dot = 0; dwidth = 0; upper = 0; cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; reswitch: switch (ch = (u_char)*fmt++) { case '.': dot = 1; goto reswitch; case '#': sharpflag = 1; goto reswitch; case '+': sign = 1; goto reswitch; case '-': ladjust = 1; goto reswitch; case '%': PCHAR(ch); break; case '*': if (!dot) { width = va_arg(ap, int); if (width < 0) { ladjust = !ladjust; width = -width; } } else { dwidth = va_arg(ap, int); } goto reswitch; case '0': if (!dot) { padc = '0'; goto reswitch; } /* FALLTHROUGH */ case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': for (n = 0;; ++fmt) { n = n * 10 + ch - '0'; ch = *fmt; if (ch < '0' || ch > '9') break; } if (dot) dwidth = n; else width = n; goto reswitch; case 'b': num = (u_int)va_arg(ap, int); p = va_arg(ap, char *); for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) PCHAR(*q--); if (num == 0) break; for (tmp = 0; *p;) { n = *p++; if (num & (1 << (n - 1))) { PCHAR(tmp ? ',' : '<'); for (; (n = *p) > ' '; ++p) PCHAR(n); tmp = 1; } else for (; *p > ' '; ++p) continue; } if (tmp) PCHAR('>'); break; case 'c': PCHAR(va_arg(ap, int)); break; case 'D': up = va_arg(ap, u_char *); p = va_arg(ap, char *); if (!width) width = 16; while(width--) { PCHAR(hex2ascii(*up >> 4)); PCHAR(hex2ascii(*up & 0x0f)); up++; if (width) for (q=p;*q;q++) PCHAR(*q); } break; case 'd': case 'i': base = 10; sign = 1; goto handle_sign; case 'h': if (hflag) { hflag = 0; cflag = 1; } else hflag = 1; goto reswitch; case 'j': jflag = 1; goto reswitch; case 'l': if (lflag) { lflag = 0; qflag = 1; } else lflag = 1; goto reswitch; case 'n': if (jflag) *(va_arg(ap, intmax_t *)) = retval; else if (qflag) *(va_arg(ap, quad_t *)) = retval; else if (lflag) *(va_arg(ap, long *)) = retval; else if (zflag) *(va_arg(ap, size_t *)) = retval; else if (hflag) *(va_arg(ap, short *)) = retval; else if (cflag) *(va_arg(ap, char *)) = retval; else *(va_arg(ap, int *)) = retval; break; case 'o': base = 8; goto handle_nosign; case 'p': base = 16; sharpflag = (width == 0); sign = 0; num = (uintptr_t)va_arg(ap, void *); goto number; case 'q': qflag = 1; goto reswitch; case 'r': base = radix; if (sign) goto handle_sign; goto handle_nosign; case 's': p = va_arg(ap, char *); if (p == NULL) p = "(null)"; if (!dot) n = strlen (p); else for (n = 0; n < dwidth && p[n]; n++) continue; width -= n; if (!ladjust && width > 0) while (width--) PCHAR(padc); while (n--) PCHAR(*p++); if (ladjust && width > 0) while (width--) PCHAR(padc); break; case 't': tflag = 1; goto reswitch; case 'u': base = 10; goto handle_nosign; case 'X': upper = 1; /* FALLTHROUGH */ case 'x': base = 16; goto handle_nosign; case 'y': base = 16; sign = 1; goto handle_sign; case 'z': zflag = 1; goto reswitch; handle_nosign: sign = 0; if (jflag) num = va_arg(ap, uintmax_t); else if (qflag) num = va_arg(ap, u_quad_t); else if (tflag) num = va_arg(ap, ptrdiff_t); else if (lflag) num = va_arg(ap, u_long); else if (zflag) num = va_arg(ap, size_t); else if (hflag) num = (u_short)va_arg(ap, int); else if (cflag) num = (u_char)va_arg(ap, int); else num = va_arg(ap, u_int); goto number; handle_sign: if (jflag) num = va_arg(ap, intmax_t); else if (qflag) num = va_arg(ap, quad_t); else if (tflag) num = va_arg(ap, ptrdiff_t); else if (lflag) num = va_arg(ap, long); else if (zflag) num = va_arg(ap, ssize_t); else if (hflag) num = (short)va_arg(ap, int); else if (cflag) num = (char)va_arg(ap, int); else num = va_arg(ap, int); number: if (sign && (intmax_t)num < 0) { neg = 1; num = -(intmax_t)num; } p = ksprintn(nbuf, num, base, &n, upper); tmp = 0; if (sharpflag && num != 0) { if (base == 8) tmp++; else if (base == 16) tmp += 2; } if (neg) tmp++; if (!ladjust && padc == '0') dwidth = width - tmp; width -= tmp + imax(dwidth, n); dwidth -= n; if (!ladjust) while (width-- > 0) PCHAR(' '); if (neg) PCHAR('-'); if (sharpflag && num != 0) { if (base == 8) { PCHAR('0'); } else if (base == 16) { PCHAR('0'); PCHAR('x'); } } while (dwidth-- > 0) PCHAR('0'); while (*p) PCHAR(*p--); if (ladjust) while (width-- > 0) PCHAR(' '); break; default: while (percent < fmt) PCHAR(*percent++); /* * Since we ignore an formatting argument it is no * longer safe to obey the remaining formatting * arguments as the arguments will no longer match * the format specs. */ stop = 1; break; } } #undef PCHAR } int rtld_snprintf(char *buf, size_t bufsize, const char *fmt, ...) { va_list ap; int retval; va_start(ap, fmt); retval = rtld_vsnprintf(buf, bufsize, fmt, ap); va_end(ap); return (retval); } int rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap) { struct snprintf_arg info; int retval; info.method = PRINT_METHOD_SNPRINTF; info.buf = info.str = buf; info.buf_total = info.remain = bufsize; info.fd = -1; retval = kvprintf(fmt, &info, 10, ap); if (info.remain >= 1) *info.str++ = '\0'; return (retval); } int rtld_vfdprintf(int fd, const char *fmt, va_list ap) { char buf[512]; struct snprintf_arg info; int retval; info.method = PRINT_METHOD_WRITE; info.buf = info.str = buf; info.buf_total = info.remain = sizeof(buf); info.fd = fd; retval = kvprintf(fmt, &info, 10, ap); printf_out(&info); return (retval); } int rtld_fdprintf(int fd, const char *fmt, ...) { va_list ap; int retval; va_start(ap, fmt); retval = rtld_vfdprintf(fd, fmt, ap); va_end(ap); return (retval); } void rtld_fdputstr(int fd, const char *str) { write(fd, str, strlen(str)); } void rtld_fdputchar(int fd, int c) { char c1; c1 = c; write(fd, &c1, 1); } Index: head/libexec/rtld-elf/xmalloc.c =================================================================== --- head/libexec/rtld-elf/xmalloc.c (revision 349553) +++ head/libexec/rtld-elf/xmalloc.c (revision 349554) @@ -1,103 +1,104 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright 1996-1998 John D. Polstra. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ #include #include #include #include #include "rtld.h" #include "rtld_printf.h" #include "rtld_malloc.h" +#include "rtld_libc.h" void * xcalloc(size_t number, size_t size) { void *p; p = __crt_calloc(number, size); if (p == NULL) { rtld_fdputstr(STDERR_FILENO, "Out of memory\n"); _exit(1); } return (p); } void * xmalloc(size_t size) { void *p; p = __crt_malloc(size); if (p == NULL) { rtld_fdputstr(STDERR_FILENO, "Out of memory\n"); _exit(1); } return (p); } char * xstrdup(const char *str) { char *copy; size_t len; len = strlen(str) + 1; copy = xmalloc(len); memcpy(copy, str, len); return (copy); } void * malloc_aligned(size_t size, size_t align) { void *mem, *res; if (align < sizeof(void *)) align = sizeof(void *); mem = xmalloc(size + sizeof(void *) + align - 1); res = (void *)round((uintptr_t)mem + sizeof(void *), align); *(void **)((uintptr_t)res - sizeof(void *)) = mem; return (res); } void free_aligned(void *ptr) { void *mem; uintptr_t x; if (ptr == NULL) return; x = (uintptr_t)ptr; x -= sizeof(void *); mem = *(void **)x; free(mem); }