diff --git a/stand/common/load_elf_obj.c b/stand/common/load_elf_obj.c index 7df88678a015..f3c84cf31368 100644 --- a/stand/common/load_elf_obj.c +++ b/stand/common/load_elf_obj.c @@ -1,579 +1,581 @@ /*- * Copyright (c) 2004 Ian Dowse * Copyright (c) 1998 Michael Smith * Copyright (c) 1998 Peter Wemm * 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 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 #include #include #include #include #include #include #include #define FREEBSD_ELF #include #include "bootstrap.h" #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) #if defined(__i386__) && __ELF_WORD_SIZE == 64 #undef ELF_TARG_CLASS #undef ELF_TARG_MACH #define ELF_TARG_CLASS ELFCLASS64 #define ELF_TARG_MACH EM_X86_64 #endif typedef struct elf_file { Elf_Ehdr hdr; Elf_Shdr *e_shdr; int symtabindex; /* Index of symbol table */ int shstrindex; /* Index of section name string table */ int fd; vm_offset_t off; #ifdef LOADER_VERIEXEC_VECTX struct vectx *vctx; #endif } *elf_file_t; #ifdef LOADER_VERIEXEC_VECTX #define VECTX_HANDLE(ef) (ef)->vctx #else #define VECTX_HANDLE(ef) (ef)->fd #endif static int __elfN(obj_loadimage)(struct preloaded_file *mp, elf_file_t ef, uint64_t loadaddr); static int __elfN(obj_lookup_set)(struct preloaded_file *mp, elf_file_t ef, const char *name, Elf_Addr *startp, Elf_Addr *stopp, int *countp); static int __elfN(obj_reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, Elf_Addr p, void *val, size_t len); static int __elfN(obj_parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef); static Elf_Addr __elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx); const char *__elfN(obj_kerneltype) = "elf kernel"; const char *__elfN(obj_moduletype) = "elf obj module"; /* * Attempt to load the file (file) as an ELF module. It will be stored at * (dest), and a pointer to a module structure describing the loaded object * will be saved in (result). */ int __elfN(obj_loadfile)(char *filename, uint64_t dest, struct preloaded_file **result) { struct preloaded_file *fp, *kfp; struct elf_file ef; Elf_Ehdr *hdr; int err; ssize_t bytes_read; fp = NULL; bzero(&ef, sizeof(struct elf_file)); /* * Open the image, read and validate the ELF header */ if (filename == NULL) /* can't handle nameless */ return(EFTYPE); if ((ef.fd = open(filename, O_RDONLY)) == -1) return(errno); #ifdef LOADER_VERIEXEC_VECTX { int verror; ef.vctx = vectx_open(ef.fd, filename, 0L, NULL, &verror, __func__); if (verror) { printf("Unverified %s: %s\n", filename, ve_error_get()); close(ef.fd); free(ef.vctx); return (EAUTH); } } #endif hdr = &ef.hdr; bytes_read = VECTX_READ(VECTX_HANDLE(&ef), hdr, sizeof(*hdr)); if (bytes_read != sizeof(*hdr)) { err = EFTYPE; /* could be EIO, but may be small file */ goto oerr; } /* Is it ELF? */ if (!IS_ELF(*hdr)) { err = EFTYPE; goto oerr; } if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */ hdr->e_ident[EI_DATA] != ELF_TARG_DATA || hdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */ hdr->e_version != EV_CURRENT || hdr->e_machine != ELF_TARG_MACH || /* Machine ? */ hdr->e_type != ET_REL) { err = EFTYPE; goto oerr; } if (hdr->e_shnum * hdr->e_shentsize == 0 || hdr->e_shoff == 0 || hdr->e_shentsize != sizeof(Elf_Shdr)) { err = EFTYPE; goto oerr; } #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX) if (verify_file(ef.fd, filename, bytes_read, VE_MUST, __func__) < 0) { err = EAUTH; goto oerr; } #endif kfp = file_findfile(NULL, __elfN(obj_kerneltype)); if (kfp == NULL) { printf("elf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadfile: can't load module before kernel\n"); err = EPERM; goto oerr; } if (archsw.arch_loadaddr != NULL) dest = archsw.arch_loadaddr(LOAD_ELF, hdr, dest); else dest = roundup(dest, PAGE_SIZE); /* * Ok, we think we should handle this. */ fp = file_alloc(); if (fp == NULL) { printf("elf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadfile: cannot allocate module info\n"); err = EPERM; goto out; } fp->f_name = strdup(filename); fp->f_type = strdup(__elfN(obj_moduletype)); printf("%s ", filename); fp->f_size = __elfN(obj_loadimage)(fp, &ef, dest); if (fp->f_size == 0 || fp->f_addr == 0) goto ioerr; /* save exec header as metadata */ file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*hdr), hdr); /* Load OK, return module pointer */ *result = (struct preloaded_file *)fp; err = 0; goto out; ioerr: err = EIO; oerr: file_discard(fp); out: #ifdef LOADER_VERIEXEC_VECTX if (!err && ef.vctx) { int verror; verror = vectx_close(ef.vctx, VE_MUST, __func__); if (verror) { err = EAUTH; file_discard(fp); } } #endif close(ef.fd); if (ef.e_shdr != NULL) free(ef.e_shdr); return(err); } /* * With the file (fd) open on the image, and (ehdr) containing * the Elf header, load the image at (off) */ static int __elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off) { Elf_Ehdr *hdr; Elf_Shdr *shdr, *cshdr, *lshdr; vm_offset_t firstaddr, lastaddr; int i, nsym, res, ret, shdrbytes, symstrindex; ret = 0; firstaddr = lastaddr = (vm_offset_t)off; hdr = &ef->hdr; ef->off = (vm_offset_t)off; /* Read in the section headers. */ shdrbytes = hdr->e_shnum * hdr->e_shentsize; shdr = alloc_pread(VECTX_HANDLE(ef), (off_t)hdr->e_shoff, shdrbytes); if (shdr == NULL) { printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadimage: read section headers failed\n"); goto out; } ef->e_shdr = shdr; /* * Decide where to load everything, but don't read it yet. * We store the load address as a non-zero sh_addr value. * Start with the code/data and bss. */ for (i = 0; i < hdr->e_shnum; i++) shdr[i].sh_addr = 0; for (i = 0; i < hdr->e_shnum; i++) { if (shdr[i].sh_size == 0) continue; switch (shdr[i].sh_type) { case SHT_PROGBITS: case SHT_NOBITS: #if defined(__i386__) || defined(__amd64__) case SHT_X86_64_UNWIND: #endif + case SHT_INIT_ARRAY: + case SHT_FINI_ARRAY: if ((shdr[i].sh_flags & SHF_ALLOC) == 0) break; lastaddr = roundup(lastaddr, shdr[i].sh_addralign); shdr[i].sh_addr = (Elf_Addr)lastaddr; lastaddr += shdr[i].sh_size; break; } } /* Symbols. */ nsym = 0; for (i = 0; i < hdr->e_shnum; i++) { switch (shdr[i].sh_type) { case SHT_SYMTAB: nsym++; ef->symtabindex = i; break; } } if (nsym != 1) { printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadimage: file has no valid symbol table\n"); goto out; } lastaddr = roundup(lastaddr, shdr[ef->symtabindex].sh_addralign); shdr[ef->symtabindex].sh_addr = (Elf_Addr)lastaddr; lastaddr += shdr[ef->symtabindex].sh_size; symstrindex = shdr[ef->symtabindex].sh_link; if (symstrindex < 0 || symstrindex >= hdr->e_shnum || shdr[symstrindex].sh_type != SHT_STRTAB) { printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadimage: file has invalid symbol strings\n"); goto out; } lastaddr = roundup(lastaddr, shdr[symstrindex].sh_addralign); shdr[symstrindex].sh_addr = (Elf_Addr)lastaddr; lastaddr += shdr[symstrindex].sh_size; /* Section names. */ if (hdr->e_shstrndx == 0 || hdr->e_shstrndx >= hdr->e_shnum || shdr[hdr->e_shstrndx].sh_type != SHT_STRTAB) { printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadimage: file has no section names\n"); goto out; } ef->shstrindex = hdr->e_shstrndx; lastaddr = roundup(lastaddr, shdr[ef->shstrindex].sh_addralign); shdr[ef->shstrindex].sh_addr = (Elf_Addr)lastaddr; lastaddr += shdr[ef->shstrindex].sh_size; /* Relocation tables. */ for (i = 0; i < hdr->e_shnum; i++) { switch (shdr[i].sh_type) { case SHT_REL: case SHT_RELA: if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0) break; lastaddr = roundup(lastaddr, shdr[i].sh_addralign); shdr[i].sh_addr = (Elf_Addr)lastaddr; lastaddr += shdr[i].sh_size; break; } } /* Clear the whole area, including bss regions. */ kern_bzero(firstaddr, lastaddr - firstaddr); /* Figure section with the lowest file offset we haven't loaded yet. */ for (cshdr = NULL; /* none */; /* none */) { /* * Find next section to load. The complexity of this loop is * O(n^2), but with the number of sections being typically * small, we do not care. */ lshdr = cshdr; for (i = 0; i < hdr->e_shnum; i++) { if (shdr[i].sh_addr == 0 || shdr[i].sh_type == SHT_NOBITS) continue; /* Skip sections that were loaded already. */ if (lshdr != NULL && lshdr->sh_offset >= shdr[i].sh_offset) continue; /* Find section with smallest offset. */ if (cshdr == lshdr || cshdr->sh_offset > shdr[i].sh_offset) cshdr = &shdr[i]; } if (cshdr == lshdr) break; if (kern_pread(VECTX_HANDLE(ef), (vm_offset_t)cshdr->sh_addr, cshdr->sh_size, (off_t)cshdr->sh_offset) != 0) { printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_obj_loadimage: read failed\n"); goto out; } } file_addmetadata(fp, MODINFOMD_SHDR, shdrbytes, shdr); res = __elfN(obj_parse_modmetadata)(fp, ef); if (res != 0) goto out; ret = lastaddr - firstaddr; fp->f_addr = firstaddr; printf("size 0x%lx at 0x%lx", (u_long)ret, (u_long)firstaddr); out: printf("\n"); return ret; } #if defined(__i386__) && __ELF_WORD_SIZE == 64 struct mod_metadata64 { int md_version; /* structure version MDTV_* */ int md_type; /* type of entry MDT_* */ uint64_t md_data; /* specific data */ uint64_t md_cval; /* common string label */ }; #endif int __elfN(obj_parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef) { struct mod_metadata md; #if defined(__i386__) && __ELF_WORD_SIZE == 64 struct mod_metadata64 md64; #endif struct mod_depend *mdepend; struct mod_version mver; char *s; int error, modcnt, minfolen; Elf_Addr v, p, p_stop; if (__elfN(obj_lookup_set)(fp, ef, "modmetadata_set", &p, &p_stop, &modcnt) != 0) return 0; modcnt = 0; while (p < p_stop) { COPYOUT(p, &v, sizeof(v)); error = __elfN(obj_reloc_ptr)(fp, ef, p, &v, sizeof(v)); if (error != 0) return (error); #if defined(__i386__) && __ELF_WORD_SIZE == 64 COPYOUT(v, &md64, sizeof(md64)); error = __elfN(obj_reloc_ptr)(fp, ef, v, &md64, sizeof(md64)); if (error != 0) return (error); md.md_version = md64.md_version; md.md_type = md64.md_type; md.md_cval = (const char *)(uintptr_t)md64.md_cval; md.md_data = (void *)(uintptr_t)md64.md_data; #else COPYOUT(v, &md, sizeof(md)); error = __elfN(obj_reloc_ptr)(fp, ef, v, &md, sizeof(md)); if (error != 0) return (error); #endif p += sizeof(Elf_Addr); switch(md.md_type) { case MDT_DEPEND: s = strdupout((vm_offset_t)md.md_cval); minfolen = sizeof(*mdepend) + strlen(s) + 1; mdepend = malloc(minfolen); if (mdepend == NULL) return ENOMEM; COPYOUT((vm_offset_t)md.md_data, mdepend, sizeof(*mdepend)); strcpy((char*)(mdepend + 1), s); free(s); file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, mdepend); free(mdepend); break; case MDT_VERSION: s = strdupout((vm_offset_t)md.md_cval); COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver)); file_addmodule(fp, s, mver.mv_version, NULL); free(s); modcnt++; break; case MDT_MODULE: case MDT_PNP_INFO: break; default: printf("unknown type %d\n", md.md_type); break; } } return 0; } static int __elfN(obj_lookup_set)(struct preloaded_file *fp, elf_file_t ef, const char* name, Elf_Addr *startp, Elf_Addr *stopp, int *countp) { Elf_Ehdr *hdr; Elf_Shdr *shdr; char *p; vm_offset_t shstrtab; int i; hdr = &ef->hdr; shdr = ef->e_shdr; shstrtab = shdr[ef->shstrindex].sh_addr; for (i = 0; i < hdr->e_shnum; i++) { if (shdr[i].sh_type != SHT_PROGBITS) continue; if (shdr[i].sh_name == 0) continue; p = strdupout(shstrtab + shdr[i].sh_name); if (strncmp(p, "set_", 4) == 0 && strcmp(p + 4, name) == 0) { *startp = shdr[i].sh_addr; *stopp = shdr[i].sh_addr + shdr[i].sh_size; *countp = (*stopp - *startp) / sizeof(Elf_Addr); free(p); return (0); } free(p); } return (ESRCH); } /* * Apply any intra-module relocations to the value. p is the load address * of the value and val/len is the value to be modified. This does NOT modify * the image in-place, because this is done by kern_linker later on. */ static int __elfN(obj_reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, Elf_Addr p, void *val, size_t len) { Elf_Ehdr *hdr; Elf_Shdr *shdr; Elf_Addr off = p; Elf_Addr base; Elf_Rela a, *abase; Elf_Rel r, *rbase; int error, i, j, nrel, nrela; hdr = &ef->hdr; shdr = ef->e_shdr; for (i = 0; i < hdr->e_shnum; i++) { if (shdr[i].sh_type != SHT_RELA && shdr[i].sh_type != SHT_REL) continue; base = shdr[shdr[i].sh_info].sh_addr; if (base == 0 || shdr[i].sh_addr == 0) continue; if (off < base || off + len > base + shdr[shdr[i].sh_info].sh_size) continue; switch (shdr[i].sh_type) { case SHT_RELA: abase = (Elf_Rela *)(intptr_t)shdr[i].sh_addr; nrela = shdr[i].sh_size / sizeof(Elf_Rela); for (j = 0; j < nrela; j++) { COPYOUT(abase + j, &a, sizeof(a)); error = __elfN(reloc)(ef, __elfN(obj_symaddr), &a, ELF_RELOC_RELA, base, off, val, len); if (error != 0) return (error); } break; case SHT_REL: rbase = (Elf_Rel *)(intptr_t)shdr[i].sh_addr; nrel = shdr[i].sh_size / sizeof(Elf_Rel); for (j = 0; j < nrel; j++) { COPYOUT(rbase + j, &r, sizeof(r)); error = __elfN(reloc)(ef, __elfN(obj_symaddr), &r, ELF_RELOC_REL, base, off, val, len); if (error != 0) return (error); } break; } } return (0); } /* Look up the address of a specified symbol. */ static Elf_Addr __elfN(obj_symaddr)(struct elf_file *ef, Elf_Size symidx) { Elf_Sym sym; Elf_Addr base; if (symidx >= ef->e_shdr[ef->symtabindex].sh_size / sizeof(Elf_Sym)) return (0); COPYOUT(ef->e_shdr[ef->symtabindex].sh_addr + symidx * sizeof(Elf_Sym), &sym, sizeof(sym)); if (sym.st_shndx == SHN_UNDEF || sym.st_shndx >= ef->hdr.e_shnum) return (0); base = ef->e_shdr[sym.st_shndx].sh_addr; if (base == 0) return (0); return (base + sym.st_value); }