Index: stable/12/lib/libproc/proc_sym.c =================================================================== --- stable/12/lib/libproc/proc_sym.c (revision 350541) +++ stable/12/lib/libproc/proc_sym.c (revision 350542) @@ -1,719 +1,720 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2016-2017 Mark Johnston * Copyright (c) 2010 The FreeBSD Foundation * Copyright (c) 2008 John Birrell (jb@freebsd.org) * All rights reserved. * * Portions of this software were developed by Rui Paulo 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 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. */ #include __FBSDID("$FreeBSD$"); #include #ifndef NO_CTF #include #include #endif #include #include #include #include #include #include #include #include #include #ifndef NO_CTF #include #endif #include #include "crc32.h" #include "_libproc.h" #define PATH_DEBUG_DIR "/usr/lib/debug" #ifdef NO_CTF typedef struct ctf_file ctf_file_t; #endif #ifndef NO_CXA_DEMANGLE extern char *__cxa_demangle(const char *, char *, size_t *, int *); #endif /* NO_CXA_DEMANGLE */ static int crc32_file(int fd, uint32_t *crc) { uint8_t buf[PAGE_SIZE], *p; size_t n; *crc = ~0; while ((n = read(fd, buf, sizeof(buf))) > 0) { p = &buf[0]; while (n-- > 0) *crc = crc32_tab[(*crc ^ *p++) & 0xff] ^ (*crc >> 8); } *crc = ~*crc; return (n); } static void demangle(const char *symbol, char *buf, size_t len) { #ifndef NO_CXA_DEMANGLE char *dembuf; if (symbol[0] == '_' && symbol[1] == 'Z' && symbol[2]) { dembuf = __cxa_demangle(symbol, NULL, NULL, NULL); if (!dembuf) goto fail; strlcpy(buf, dembuf, len); free(dembuf); return; } fail: #endif /* NO_CXA_DEMANGLE */ strlcpy(buf, symbol, len); } struct symsort_thunk { Elf *e; struct symtab *symtab; }; static int symvalcmp(void *_thunk, const void *a1, const void *a2) { GElf_Sym sym1, sym2; struct symsort_thunk *thunk; const char *s1, *s2; u_int i1, i2; int bind1, bind2; i1 = *(const u_int *)a1; i2 = *(const u_int *)a2; thunk = _thunk; (void)gelf_getsym(thunk->symtab->data, i1, &sym1); (void)gelf_getsym(thunk->symtab->data, i2, &sym2); if (sym1.st_value != sym2.st_value) return (sym1.st_value < sym2.st_value ? -1 : 1); /* Prefer non-local symbols. */ bind1 = GELF_ST_BIND(sym1.st_info); bind2 = GELF_ST_BIND(sym2.st_info); if (bind1 != bind2) { if (bind1 == STB_LOCAL && bind2 != STB_LOCAL) return (-1); if (bind1 != STB_LOCAL && bind2 == STB_LOCAL) return (1); } s1 = elf_strptr(thunk->e, thunk->symtab->stridx, sym1.st_name); s2 = elf_strptr(thunk->e, thunk->symtab->stridx, sym2.st_name); if (s1 != NULL && s2 != NULL) { /* Prefer symbols without a leading '$'. */ if (*s1 == '$') return (-1); if (*s2 == '$') return (1); /* Prefer symbols with fewer leading underscores. */ for (; *s1 == '_' && *s2 == '_'; s1++, s2++) ; if (*s1 == '_') return (-1); if (*s2 == '_') return (1); } return (0); } static int load_symtab(Elf *e, struct symtab *symtab, u_long sh_type) { GElf_Ehdr ehdr; GElf_Shdr shdr; struct symsort_thunk thunk; Elf_Scn *scn; u_int nsyms; if (gelf_getehdr(e, &ehdr) == NULL) return (-1); scn = NULL; while ((scn = elf_nextscn(e, scn)) != NULL) { (void)gelf_getshdr(scn, &shdr); if (shdr.sh_type == sh_type) break; } if (scn == NULL) return (-1); nsyms = shdr.sh_size / shdr.sh_entsize; if (nsyms > (1 << 20)) return (-1); if ((symtab->data = elf_getdata(scn, NULL)) == NULL) return (-1); symtab->index = calloc(nsyms, sizeof(u_int)); if (symtab->index == NULL) return (-1); for (u_int i = 0; i < nsyms; i++) symtab->index[i] = i; symtab->nsyms = nsyms; symtab->stridx = shdr.sh_link; thunk.e = e; thunk.symtab = symtab; qsort_r(symtab->index, nsyms, sizeof(u_int), &thunk, symvalcmp); return (0); } static void load_symtabs(struct file_info *file) { file->symtab.nsyms = file->dynsymtab.nsyms = 0; (void)load_symtab(file->elf, &file->symtab, SHT_SYMTAB); (void)load_symtab(file->elf, &file->dynsymtab, SHT_DYNSYM); } static int open_debug_file(char *path, const char *debugfile, uint32_t crc) { size_t n; uint32_t compcrc; int fd; fd = -1; if ((n = strlcat(path, "/", PATH_MAX)) >= PATH_MAX) return (fd); if (strlcat(path, debugfile, PATH_MAX) >= PATH_MAX) goto out; if ((fd = open(path, O_RDONLY | O_CLOEXEC)) < 0) goto out; if (crc32_file(fd, &compcrc) != 0 || crc != compcrc) { DPRINTFX("ERROR: CRC32 mismatch for %s", path); (void)close(fd); fd = -1; } out: path[n] = '\0'; return (fd); } /* * Obtain an ELF descriptor for the specified mapped object. If a GNU debuglink * section is present, a descriptor for the corresponding debug file is * returned. */ static int open_object(struct map_info *mapping) { char path[PATH_MAX]; GElf_Shdr shdr; Elf *e, *e2; Elf_Data *data; Elf_Scn *scn; struct file_info *file; prmap_t *map; const char *debugfile, *scnname; size_t ndx; uint32_t crc; int fd, fd2; if (mapping->map.pr_mapname[0] == '\0') return (-1); /* anonymous object */ if (mapping->file->elf != NULL) return (0); /* already loaded */ file = mapping->file; map = &mapping->map; if ((fd = open(map->pr_mapname, O_RDONLY | O_CLOEXEC)) < 0) { DPRINTF("ERROR: open %s failed", map->pr_mapname); return (-1); } if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL) { DPRINTFX("ERROR: elf_begin() failed: %s", elf_errmsg(-1)); goto err; } if (gelf_getehdr(e, &file->ehdr) != &file->ehdr) { DPRINTFX("ERROR: elf_getehdr() failed: %s", elf_errmsg(-1)); goto err; } scn = NULL; while ((scn = elf_nextscn(e, scn)) != NULL) { if (gelf_getshdr(scn, &shdr) != &shdr) { DPRINTFX("ERROR: gelf_getshdr failed: %s", elf_errmsg(-1)); goto err; } if (shdr.sh_type != SHT_PROGBITS) continue; if (elf_getshdrstrndx(e, &ndx) != 0) { DPRINTFX("ERROR: elf_getshdrstrndx failed: %s", elf_errmsg(-1)); goto err; } if ((scnname = elf_strptr(e, ndx, shdr.sh_name)) == NULL) continue; if (strcmp(scnname, ".gnu_debuglink") == 0) break; } if (scn == NULL) goto internal; if ((data = elf_getdata(scn, NULL)) == NULL) { DPRINTFX("ERROR: elf_getdata failed: %s", elf_errmsg(-1)); goto err; } /* * The data contains a null-terminated file name followed by a 4-byte * CRC. */ if (data->d_size < sizeof(crc) + 1) { DPRINTFX("ERROR: debuglink section is too small (%zd bytes)", data->d_size); goto internal; } if (strnlen(data->d_buf, data->d_size) >= data->d_size - sizeof(crc)) { DPRINTFX("ERROR: no null-terminator in gnu_debuglink section"); goto internal; } debugfile = data->d_buf; memcpy(&crc, (char *)data->d_buf + data->d_size - sizeof(crc), sizeof(crc)); /* * Search for the debug file using the algorithm described in the gdb * documentation: * - look in the directory containing the object, * - look in the subdirectory ".debug" of the directory containing the * object, * - look in the global debug directories (currently /usr/lib/debug). */ (void)strlcpy(path, map->pr_mapname, sizeof(path)); (void)dirname(path); if ((fd2 = open_debug_file(path, debugfile, crc)) >= 0) goto external; if (strlcat(path, "/.debug", sizeof(path)) < sizeof(path) && (fd2 = open_debug_file(path, debugfile, crc)) >= 0) goto external; (void)snprintf(path, sizeof(path), PATH_DEBUG_DIR); if (strlcat(path, map->pr_mapname, sizeof(path)) < sizeof(path)) { (void)dirname(path); if ((fd2 = open_debug_file(path, debugfile, crc)) >= 0) goto external; } internal: /* We didn't find a debug file, just return the object's descriptor. */ file->elf = e; file->fd = fd; load_symtabs(file); return (0); external: if ((e2 = elf_begin(fd2, ELF_C_READ, NULL)) == NULL) { DPRINTFX("ERROR: elf_begin failed: %s", elf_errmsg(-1)); (void)close(fd2); goto err; } (void)elf_end(e); (void)close(fd); file->elf = e2; file->fd = fd2; load_symtabs(file); return (0); err: if (e != NULL) (void)elf_end(e); (void)close(fd); return (-1); } char * proc_objname(struct proc_handle *p, uintptr_t addr, char *objname, size_t objnamesz) { prmap_t *map; size_t i; if (p->nmappings == 0) if (proc_rdagent(p) == NULL) return (NULL); for (i = 0; i < p->nmappings; i++) { map = &p->mappings[i].map; if (addr >= map->pr_vaddr && addr < map->pr_vaddr + map->pr_size) { strlcpy(objname, map->pr_mapname, objnamesz); return (objname); } } return (NULL); } int proc_iter_objs(struct proc_handle *p, proc_map_f *func, void *cd) { char last[MAXPATHLEN], path[MAXPATHLEN], *base; prmap_t *map; size_t i; int error; if (p->nmappings == 0) if (proc_rdagent(p) == NULL) return (-1); error = 0; memset(last, 0, sizeof(last)); for (i = 0; i < p->nmappings; i++) { map = &p->mappings[i].map; strlcpy(path, map->pr_mapname, sizeof(path)); base = basename(path); /* * We shouldn't call the callback twice with the same object. * To do that we are assuming the fact that if there are * repeated object names (i.e. different mappings for the * same object) they occur next to each other. */ if (strcmp(base, last) == 0) continue; if ((error = (*func)(cd, map, base)) != 0) break; strlcpy(last, path, sizeof(last)); } return (error); } static struct map_info * _proc_addr2map(struct proc_handle *p, uintptr_t addr) { struct map_info *mapping; size_t i; if (p->nmappings == 0) if (proc_rdagent(p) == NULL) return (NULL); for (i = 0; i < p->nmappings; i++) { mapping = &p->mappings[i]; if (addr >= mapping->map.pr_vaddr && addr < mapping->map.pr_vaddr + mapping->map.pr_size) return (mapping); } return (NULL); } prmap_t * proc_addr2map(struct proc_handle *p, uintptr_t addr) { return (&_proc_addr2map(p, addr)->map); } /* * Look up the symbol at addr using a binary search, returning a copy of the * symbol and its name. */ static int lookup_symbol_by_addr(Elf *e, struct symtab *symtab, uintptr_t addr, const char **namep, GElf_Sym *symp) { GElf_Sym sym; Elf_Data *data; const char *s; u_int i, min, max, mid; if (symtab->nsyms == 0) return (ENOENT); data = symtab->data; min = 0; max = symtab->nsyms - 1; while (min <= max) { mid = (max + min) / 2; (void)gelf_getsym(data, symtab->index[mid], &sym); if (addr >= sym.st_value && addr < sym.st_value + sym.st_size) break; if (addr < sym.st_value) max = mid - 1; else min = mid + 1; } if (min > max) return (ENOENT); /* * Advance until we find the matching symbol with largest index. */ for (i = mid; i < symtab->nsyms; i++) { (void)gelf_getsym(data, symtab->index[i], &sym); if (addr < sym.st_value || addr >= sym.st_value + sym.st_size) break; } (void)gelf_getsym(data, symtab->index[i - 1], symp); s = elf_strptr(e, symtab->stridx, symp->st_name); if (s != NULL && namep != NULL) *namep = s; return (0); } int proc_addr2sym(struct proc_handle *p, uintptr_t addr, char *name, size_t namesz, GElf_Sym *symcopy) { struct file_info *file; struct map_info *mapping; const char *s; uintptr_t off; int error; if ((mapping = _proc_addr2map(p, addr)) == NULL) { DPRINTFX("ERROR: proc_addr2map failed to resolve 0x%jx", addr); return (-1); } if (open_object(mapping) != 0) { DPRINTFX("ERROR: failed to open object %s", mapping->map.pr_mapname); return (-1); } file = mapping->file; off = file->ehdr.e_type == ET_DYN ? mapping->map.pr_vaddr - mapping->map.pr_offset : 0; if (addr < off) return (ENOENT); addr -= off; error = lookup_symbol_by_addr(file->elf, &file->dynsymtab, addr, &s, symcopy); if (error == ENOENT) error = lookup_symbol_by_addr(file->elf, &file->symtab, addr, &s, symcopy); if (error == 0) { symcopy->st_value += off; demangle(s, name, namesz); } return (error); } static struct map_info * _proc_name2map(struct proc_handle *p, const char *name) { char path[MAXPATHLEN], *base; struct map_info *mapping; size_t i, len; if ((len = strlen(name)) == 0) return (NULL); if (p->nmappings == 0) if (proc_rdagent(p) == NULL) return (NULL); for (i = 0; i < p->nmappings; i++) { mapping = &p->mappings[i]; (void)strlcpy(path, mapping->map.pr_mapname, sizeof(path)); base = basename(path); if (strcmp(base, name) == 0) return (mapping); } /* If we didn't find a match, try matching prefixes of the basename. */ for (i = 0; i < p->nmappings; i++) { - strlcpy(path, p->mappings[i].map.pr_mapname, sizeof(path)); + mapping = &p->mappings[i]; + strlcpy(path, mapping->map.pr_mapname, sizeof(path)); base = basename(path); if (strncmp(base, name, len) == 0) - return (&p->mappings[i]); + return (mapping); } if (strcmp(name, "a.out") == 0) return (_proc_addr2map(p, p->mappings[p->exec_map].map.pr_vaddr)); return (NULL); } prmap_t * proc_name2map(struct proc_handle *p, const char *name) { return (&_proc_name2map(p, name)->map); } /* * Look up the symbol with the given name and return a copy of it. */ static int lookup_symbol_by_name(Elf *elf, struct symtab *symtab, const char *symbol, GElf_Sym *symcopy, prsyminfo_t *si) { GElf_Sym sym; Elf_Data *data; char *s; int i; if (symtab->nsyms == 0) return (ENOENT); data = symtab->data; for (i = 0; gelf_getsym(data, i, &sym) != NULL; i++) { s = elf_strptr(elf, symtab->stridx, sym.st_name); if (s != NULL && strcmp(s, symbol) == 0) { memcpy(symcopy, &sym, sizeof(*symcopy)); if (si != NULL) si->prs_id = i; return (0); } } return (ENOENT); } int proc_name2sym(struct proc_handle *p, const char *object, const char *symbol, GElf_Sym *symcopy, prsyminfo_t *si) { struct file_info *file; struct map_info *mapping; uintptr_t off; int error; if ((mapping = _proc_name2map(p, object)) == NULL) { DPRINTFX("ERROR: proc_name2map failed to resolve %s", object); return (-1); } if (open_object(mapping) != 0) { DPRINTFX("ERROR: failed to open object %s", mapping->map.pr_mapname); return (-1); } file = mapping->file; off = file->ehdr.e_type == ET_DYN ? mapping->map.pr_vaddr - mapping->map.pr_offset : 0; error = lookup_symbol_by_name(file->elf, &file->dynsymtab, symbol, symcopy, si); if (error == ENOENT) error = lookup_symbol_by_name(file->elf, &file->symtab, symbol, symcopy, si); if (error == 0) symcopy->st_value += off; return (error); } ctf_file_t * proc_name2ctf(struct proc_handle *p, const char *name) { #ifndef NO_CTF ctf_file_t *ctf; prmap_t *map; int error; if ((map = proc_name2map(p, name)) == NULL) return (NULL); ctf = ctf_open(map->pr_mapname, &error); return (ctf); #else (void)p; (void)name; return (NULL); #endif } int proc_iter_symbyaddr(struct proc_handle *p, const char *object, int which, int mask, proc_sym_f *func, void *cd) { GElf_Sym sym; struct file_info *file; struct map_info *mapping; struct symtab *symtab; const char *s; int error, i; if ((mapping = _proc_name2map(p, object)) == NULL) { DPRINTFX("ERROR: proc_name2map failed to resolve %s", object); return (-1); } if (open_object(mapping) != 0) { DPRINTFX("ERROR: failed to open object %s", mapping->map.pr_mapname); return (-1); } file = mapping->file; symtab = which == PR_SYMTAB ? &file->symtab : &file->dynsymtab; if (symtab->nsyms == 0) return (-1); error = 0; for (i = 0; gelf_getsym(symtab->data, i, &sym) != NULL; i++) { if (GELF_ST_BIND(sym.st_info) == STB_LOCAL && (mask & BIND_LOCAL) == 0) continue; if (GELF_ST_BIND(sym.st_info) == STB_GLOBAL && (mask & BIND_GLOBAL) == 0) continue; if (GELF_ST_BIND(sym.st_info) == STB_WEAK && (mask & BIND_WEAK) == 0) continue; if (GELF_ST_TYPE(sym.st_info) == STT_NOTYPE && (mask & TYPE_NOTYPE) == 0) continue; if (GELF_ST_TYPE(sym.st_info) == STT_OBJECT && (mask & TYPE_OBJECT) == 0) continue; if (GELF_ST_TYPE(sym.st_info) == STT_FUNC && (mask & TYPE_FUNC) == 0) continue; if (GELF_ST_TYPE(sym.st_info) == STT_SECTION && (mask & TYPE_SECTION) == 0) continue; if (GELF_ST_TYPE(sym.st_info) == STT_FILE && (mask & TYPE_FILE) == 0) continue; s = elf_strptr(file->elf, symtab->stridx, sym.st_name); if (file->ehdr.e_type == ET_DYN) sym.st_value += mapping->map.pr_vaddr; if ((error = (*func)(cd, &sym, s)) != 0) break; } return (error); } Index: stable/12 =================================================================== --- stable/12 (revision 350541) +++ stable/12 (revision 350542) Property changes on: stable/12 ___________________________________________________________________ Modified: svn:mergeinfo ## -0,0 +0,1 ## Merged /head:r350218