diff options
Diffstat (limited to 'sys/boot/common/load_elf.c')
| -rw-r--r-- | sys/boot/common/load_elf.c | 1038 |
1 files changed, 0 insertions, 1038 deletions
diff --git a/sys/boot/common/load_elf.c b/sys/boot/common/load_elf.c deleted file mode 100644 index 679842b9423e..000000000000 --- a/sys/boot/common/load_elf.c +++ /dev/null @@ -1,1038 +0,0 @@ -/*- - * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> - * Copyright (c) 1998 Peter Wemm <peter@freebsd.org> - * 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 <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include <sys/param.h> -#include <sys/exec.h> -#include <sys/linker.h> -#include <sys/module.h> -#include <sys/stdint.h> -#include <string.h> -#include <machine/elf.h> -#include <stand.h> -#define FREEBSD_ELF -#include <link.h> - -#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_Phdr *ph; - Elf_Ehdr *ehdr; - Elf_Sym *symtab; - Elf_Hashelt *hashtab; - Elf_Hashelt nbuckets; - Elf_Hashelt nchains; - Elf_Hashelt *buckets; - Elf_Hashelt *chains; - Elf_Rel *rel; - size_t relsz; - Elf_Rela *rela; - size_t relasz; - char *strtab; - size_t strsz; - int fd; - caddr_t firstpage; - size_t firstlen; - int kernel; - u_int64_t off; -} *elf_file_t; - -static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef, u_int64_t loadaddr); -static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef, const char* name, Elf_Sym* sym); -static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, - Elf_Addr p, void *val, size_t len); -static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef, - Elf_Addr p_start, Elf_Addr p_end); -static symaddr_fn __elfN(symaddr); -static char *fake_modname(const char *name); - -const char *__elfN(kerneltype) = "elf kernel"; -const char *__elfN(moduletype) = "elf module"; - -u_int64_t __elfN(relocation_offset) = 0; - -static int -__elfN(load_elf_header)(char *filename, elf_file_t ef) -{ - ssize_t bytes_read; - Elf_Ehdr *ehdr; - int err; - - /* - * 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); - ef->firstpage = malloc(PAGE_SIZE); - if (ef->firstpage == NULL) { - close(ef->fd); - return (ENOMEM); - } - bytes_read = read(ef->fd, ef->firstpage, PAGE_SIZE); - ef->firstlen = (size_t)bytes_read; - if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) { - err = EFTYPE; /* could be EIO, but may be small file */ - goto error; - } - ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage; - - /* Is it ELF? */ - if (!IS_ELF(*ehdr)) { - err = EFTYPE; - goto error; - } - if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */ - ehdr->e_ident[EI_DATA] != ELF_TARG_DATA || - ehdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */ - ehdr->e_version != EV_CURRENT || - ehdr->e_machine != ELF_TARG_MACH) { /* Machine ? */ - err = EFTYPE; - goto error; - } - - return (0); - -error: - if (ef->firstpage != NULL) { - free(ef->firstpage); - ef->firstpage = NULL; - } - if (ef->fd != -1) { - close(ef->fd); - ef->fd = -1; - } - return (err); -} - -/* - * 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(loadfile)(char *filename, u_int64_t dest, struct preloaded_file **result) -{ - return (__elfN(loadfile_raw)(filename, dest, result, 0)); -} - -int -__elfN(loadfile_raw)(char *filename, u_int64_t dest, - struct preloaded_file **result, int multiboot) -{ - struct preloaded_file *fp, *kfp; - struct elf_file ef; - Elf_Ehdr *ehdr; - int err; - - fp = NULL; - bzero(&ef, sizeof(struct elf_file)); - ef.fd = -1; - - err = __elfN(load_elf_header)(filename, &ef); - if (err != 0) - return (err); - - ehdr = ef.ehdr; - - /* - * Check to see what sort of module we are. - */ - kfp = file_findfile(NULL, __elfN(kerneltype)); -#ifdef __powerpc__ - /* - * Kernels can be ET_DYN, so just assume the first loaded object is the - * kernel. This assumption will be checked later. - */ - if (kfp == NULL) - ef.kernel = 1; -#endif - if (ef.kernel || ehdr->e_type == ET_EXEC) { - /* Looks like a kernel */ - if (kfp != NULL) { - printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: kernel already loaded\n"); - err = EPERM; - goto oerr; - } - /* - * Calculate destination address based on kernel entrypoint. - * - * For ARM, the destination address is independent of any values in the - * elf header (an ARM kernel can be loaded at any 2MB boundary), so we - * leave dest set to the value calculated by archsw.arch_loadaddr() and - * passed in to this function. - */ -#ifndef __arm__ - if (ehdr->e_type == ET_EXEC) - dest = (ehdr->e_entry & ~PAGE_MASK); -#endif - if ((ehdr->e_entry & ~PAGE_MASK) == 0) { - printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: not a kernel (maybe static binary?)\n"); - err = EPERM; - goto oerr; - } - ef.kernel = 1; - - } else if (ehdr->e_type == ET_DYN) { - /* Looks like a kld module */ - if (multiboot != 0) { - printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module as multiboot\n"); - err = EPERM; - goto oerr; - } - if (kfp == NULL) { - printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module before kernel\n"); - err = EPERM; - goto oerr; - } - if (strcmp(__elfN(kerneltype), kfp->f_type)) { - printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadfile: can't load module with kernel type '%s'\n", kfp->f_type); - err = EPERM; - goto oerr; - } - /* Looks OK, got ahead */ - ef.kernel = 0; - - } else { - err = EFTYPE; - goto oerr; - } - - if (archsw.arch_loadaddr != NULL) - dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, 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) "_loadfile: cannot allocate module info\n"); - err = EPERM; - goto out; - } - if (ef.kernel == 1 && multiboot == 0) - setenv("kernelname", filename, 1); - fp->f_name = strdup(filename); - if (multiboot == 0) - fp->f_type = strdup(ef.kernel ? - __elfN(kerneltype) : __elfN(moduletype)); - else - fp->f_type = strdup("elf multiboot kernel"); - -#ifdef ELF_VERBOSE - if (ef.kernel) - printf("%s entry at 0x%jx\n", filename, (uintmax_t)ehdr->e_entry); -#else - printf("%s ", filename); -#endif - - fp->f_size = __elfN(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(*ehdr), ehdr); - - /* Load OK, return module pointer */ - *result = (struct preloaded_file *)fp; - err = 0; - goto out; - - ioerr: - err = EIO; - oerr: - file_discard(fp); - out: - if (ef.firstpage) - free(ef.firstpage); - if (ef.fd != -1) - close(ef.fd); - return(err); -} - -/* - * With the file (fd) open on the image, and (ehdr) containing - * the Elf header, load the image at (off) - */ -static int -__elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off) -{ - int i; - u_int j; - Elf_Ehdr *ehdr; - Elf_Phdr *phdr, *php; - Elf_Shdr *shdr; - char *shstr; - int ret; - vm_offset_t firstaddr; - vm_offset_t lastaddr; - size_t chunk; - ssize_t result; - Elf_Addr ssym, esym; - Elf_Dyn *dp; - Elf_Addr adp; - Elf_Addr ctors; - int ndp; - int symstrindex; - int symtabindex; - Elf_Size size; - u_int fpcopy; - Elf_Sym sym; - Elf_Addr p_start, p_end; - - dp = NULL; - shdr = NULL; - ret = 0; - firstaddr = lastaddr = 0; - ehdr = ef->ehdr; - if (ehdr->e_type == ET_EXEC) { -#if defined(__i386__) || defined(__amd64__) -#if __ELF_WORD_SIZE == 64 - off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */ -#else - off = - (off & 0xff000000u); /* i386 relocates after locore */ -#endif -#elif defined(__powerpc__) - /* - * On the purely virtual memory machines like e500, the kernel is - * linked against its final VA range, which is most often not - * available at the loader stage, but only after kernel initializes - * and completes its VM settings. In such cases we cannot use p_vaddr - * field directly to load ELF segments, but put them at some - * 'load-time' locations. - */ - if (off & 0xf0000000u) { - off = -(off & 0xf0000000u); - /* - * XXX the physical load address should not be hardcoded. Note - * that the Book-E kernel assumes that it's loaded at a 16MB - * boundary for now... - */ - off += 0x01000000; - ehdr->e_entry += off; -#ifdef ELF_VERBOSE - printf("Converted entry 0x%08x\n", ehdr->e_entry); -#endif - } else - off = 0; -#elif defined(__arm__) && !defined(EFI) - /* - * The elf headers in arm kernels specify virtual addresses in all - * header fields, even the ones that should be physical addresses. - * We assume the entry point is in the first page, and masking the page - * offset will leave us with the virtual address the kernel was linked - * at. We subtract that from the load offset, making 'off' into the - * value which, when added to a virtual address in an elf header, - * translates it to a physical address. We do the va->pa conversion on - * the entry point address in the header now, so that later we can - * launch the kernel by just jumping to that address. - * - * When booting from UEFI the copyin and copyout functions handle - * adjusting the location relative to the first virtual address. - * Because of this there is no need to adjust the offset or entry - * point address as these will both be handled by the efi code. - */ - off -= ehdr->e_entry & ~PAGE_MASK; - ehdr->e_entry += off; -#ifdef ELF_VERBOSE - printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n", ehdr->e_entry, off); -#endif -#else - off = 0; /* other archs use direct mapped kernels */ -#endif - } - ef->off = off; - - if (ef->kernel) - __elfN(relocation_offset) = off; - - if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) { - printf("elf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: program header not within first page\n"); - goto out; - } - phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff); - - for (i = 0; i < ehdr->e_phnum; i++) { - /* We want to load PT_LOAD segments only.. */ - if (phdr[i].p_type != PT_LOAD) - continue; - -#ifdef ELF_VERBOSE - printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx", - (long)phdr[i].p_filesz, (long)phdr[i].p_offset, - (long)(phdr[i].p_vaddr + off), - (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1)); -#else - if ((phdr[i].p_flags & PF_W) == 0) { - printf("text=0x%lx ", (long)phdr[i].p_filesz); - } else { - printf("data=0x%lx", (long)phdr[i].p_filesz); - if (phdr[i].p_filesz < phdr[i].p_memsz) - printf("+0x%lx", (long)(phdr[i].p_memsz -phdr[i].p_filesz)); - printf(" "); - } -#endif - fpcopy = 0; - if (ef->firstlen > phdr[i].p_offset) { - fpcopy = ef->firstlen - phdr[i].p_offset; - archsw.arch_copyin(ef->firstpage + phdr[i].p_offset, - phdr[i].p_vaddr + off, fpcopy); - } - if (phdr[i].p_filesz > fpcopy) { - if (kern_pread(ef->fd, phdr[i].p_vaddr + off + fpcopy, - phdr[i].p_filesz - fpcopy, phdr[i].p_offset + fpcopy) != 0) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "_loadimage: read failed\n"); - goto out; - } - } - /* clear space from oversized segments; eg: bss */ - if (phdr[i].p_filesz < phdr[i].p_memsz) { -#ifdef ELF_VERBOSE - printf(" (bss: 0x%lx-0x%lx)", - (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz), - (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1)); -#endif - - kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz, - phdr[i].p_memsz - phdr[i].p_filesz); - } -#ifdef ELF_VERBOSE - printf("\n"); -#endif - - if (archsw.arch_loadseg != NULL) - archsw.arch_loadseg(ehdr, phdr + i, off); - - if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off)) - firstaddr = phdr[i].p_vaddr + off; - if (lastaddr == 0 || lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz)) - lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz; - } - lastaddr = roundup(lastaddr, sizeof(long)); - - /* - * Get the section headers. We need this for finding the .ctors - * section as well as for loading any symbols. Both may be hard - * to do if reading from a .gz file as it involves seeking. I - * think the rule is going to have to be that you must strip a - * file to remove symbols before gzipping it. - */ - chunk = ehdr->e_shnum * ehdr->e_shentsize; - if (chunk == 0 || ehdr->e_shoff == 0) - goto nosyms; - shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk); - if (shdr == NULL) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "_loadimage: failed to read section headers"); - goto nosyms; - } - file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr); - - /* - * Read the section string table and look for the .ctors section. - * We need to tell the kernel where it is so that it can call the - * ctors. - */ - chunk = shdr[ehdr->e_shstrndx].sh_size; - if (chunk) { - shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset, chunk); - if (shstr) { - for (i = 0; i < ehdr->e_shnum; i++) { - if (strcmp(shstr + shdr[i].sh_name, ".ctors") != 0) - continue; - ctors = shdr[i].sh_addr; - file_addmetadata(fp, MODINFOMD_CTORS_ADDR, sizeof(ctors), - &ctors); - size = shdr[i].sh_size; - file_addmetadata(fp, MODINFOMD_CTORS_SIZE, sizeof(size), - &size); - break; - } - free(shstr); - } - } - - /* - * Now load any symbols. - */ - symtabindex = -1; - symstrindex = -1; - for (i = 0; i < ehdr->e_shnum; i++) { - if (shdr[i].sh_type != SHT_SYMTAB) - continue; - for (j = 0; j < ehdr->e_phnum; j++) { - if (phdr[j].p_type != PT_LOAD) - continue; - if (shdr[i].sh_offset >= phdr[j].p_offset && - (shdr[i].sh_offset + shdr[i].sh_size <= - phdr[j].p_offset + phdr[j].p_filesz)) { - shdr[i].sh_offset = 0; - shdr[i].sh_size = 0; - break; - } - } - if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0) - continue; /* alread loaded in a PT_LOAD above */ - /* Save it for loading below */ - symtabindex = i; - symstrindex = shdr[i].sh_link; - } - if (symtabindex < 0 || symstrindex < 0) - goto nosyms; - - /* Ok, committed to a load. */ -#ifndef ELF_VERBOSE - printf("syms=["); -#endif - ssym = lastaddr; - for (i = symtabindex; i >= 0; i = symstrindex) { -#ifdef ELF_VERBOSE - char *secname; - - switch(shdr[i].sh_type) { - case SHT_SYMTAB: /* Symbol table */ - secname = "symtab"; - break; - case SHT_STRTAB: /* String table */ - secname = "strtab"; - break; - default: - secname = "WHOA!!"; - break; - } -#endif - - size = shdr[i].sh_size; - archsw.arch_copyin(&size, lastaddr, sizeof(size)); - lastaddr += sizeof(size); - -#ifdef ELF_VERBOSE - printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname, - (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset, - (uintmax_t)lastaddr, (uintmax_t)(lastaddr + shdr[i].sh_size)); -#else - if (i == symstrindex) - printf("+"); - printf("0x%lx+0x%lx", (long)sizeof(size), (long)size); -#endif - - if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not seek for symbols - skipped!"); - lastaddr = ssym; - ssym = 0; - goto nosyms; - } - result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size); - if (result < 0 || (size_t)result != shdr[i].sh_size) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: could not read symbols - skipped! (%ju != %ju)", (uintmax_t)result, - (uintmax_t)shdr[i].sh_size); - lastaddr = ssym; - ssym = 0; - goto nosyms; - } - /* Reset offsets relative to ssym */ - lastaddr += shdr[i].sh_size; - lastaddr = roundup(lastaddr, sizeof(size)); - if (i == symtabindex) - symtabindex = -1; - else if (i == symstrindex) - symstrindex = -1; - } - esym = lastaddr; -#ifndef ELF_VERBOSE - printf("]"); -#endif - - file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym); - file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym); - -nosyms: - printf("\n"); - - ret = lastaddr - firstaddr; - fp->f_addr = firstaddr; - - php = NULL; - for (i = 0; i < ehdr->e_phnum; i++) { - if (phdr[i].p_type == PT_DYNAMIC) { - php = phdr + i; - adp = php->p_vaddr; - file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), &adp); - break; - } - } - - if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */ - goto out; - - ndp = php->p_filesz / sizeof(Elf_Dyn); - if (ndp == 0) - goto out; - dp = malloc(php->p_filesz); - if (dp == NULL) - goto out; - archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz); - - ef->strsz = 0; - for (i = 0; i < ndp; i++) { - if (dp[i].d_tag == 0) - break; - switch (dp[i].d_tag) { - case DT_HASH: - ef->hashtab = (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off); - break; - case DT_STRTAB: - ef->strtab = (char *)(uintptr_t)(dp[i].d_un.d_ptr + off); - break; - case DT_STRSZ: - ef->strsz = dp[i].d_un.d_val; - break; - case DT_SYMTAB: - ef->symtab = (Elf_Sym*)(uintptr_t)(dp[i].d_un.d_ptr + off); - break; - case DT_REL: - ef->rel = (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off); - break; - case DT_RELSZ: - ef->relsz = dp[i].d_un.d_val; - break; - case DT_RELA: - ef->rela = (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off); - break; - case DT_RELASZ: - ef->relasz = dp[i].d_un.d_val; - break; - default: - break; - } - } - if (ef->hashtab == NULL || ef->symtab == NULL || - ef->strtab == NULL || ef->strsz == 0) - goto out; - COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets)); - COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains)); - ef->buckets = ef->hashtab + 2; - ef->chains = ef->buckets + ef->nbuckets; - - if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set", &sym) != 0) - return 0; - p_start = sym.st_value + ef->off; - if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set", &sym) != 0) - return ENOENT; - p_end = sym.st_value + ef->off; - - if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0) - goto out; - - if (ef->kernel) /* kernel must not depend on anything */ - goto out; - -out: - if (dp) - free(dp); - if (shdr) - free(shdr); - return ret; -} - -static char invalid_name[] = "bad"; - -char * -fake_modname(const char *name) -{ - const char *sp, *ep; - char *fp; - size_t len; - - sp = strrchr(name, '/'); - if (sp) - sp++; - else - sp = name; - ep = strrchr(name, '.'); - if (ep) { - if (ep == name) { - sp = invalid_name; - ep = invalid_name + sizeof(invalid_name) - 1; - } - } else - ep = name + strlen(name); - len = ep - sp; - fp = malloc(len + 1); - if (fp == NULL) - return NULL; - memcpy(fp, sp, len); - fp[len] = '\0'; - return fp; -} - -#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 -struct mod_metadata64 { - int md_version; /* structure version MDTV_* */ - int md_type; /* type of entry MDT_* */ - u_int64_t md_data; /* specific data */ - u_int64_t md_cval; /* common string label */ -}; -#endif -#if defined(__amd64__) && __ELF_WORD_SIZE == 32 -struct mod_metadata32 { - int md_version; /* structure version MDTV_* */ - int md_type; /* type of entry MDT_* */ - u_int32_t md_data; /* specific data */ - u_int32_t md_cval; /* common string label */ -}; -#endif - -int -__elfN(load_modmetadata)(struct preloaded_file *fp, u_int64_t dest) -{ - struct elf_file ef; - int err, i, j; - Elf_Shdr *sh_meta, *shdr = NULL; - Elf_Shdr *sh_data[2]; - char *shstrtab = NULL; - size_t size; - Elf_Addr p_start, p_end; - - bzero(&ef, sizeof(struct elf_file)); - ef.fd = -1; - - err = __elfN(load_elf_header)(fp->f_name, &ef); - if (err != 0) - goto out; - - if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) { - ef.kernel = 1; - } else if (ef.ehdr->e_type != ET_DYN) { - err = EFTYPE; - goto out; - } - - size = ef.ehdr->e_shnum * ef.ehdr->e_shentsize; - shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size); - if (shdr == NULL) { - err = ENOMEM; - goto out; - } - - /* Load shstrtab. */ - shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset, - shdr[ef.ehdr->e_shstrndx].sh_size); - if (shstrtab == NULL) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "load_modmetadata: unable to load shstrtab\n"); - err = EFTYPE; - goto out; - } - - /* Find set_modmetadata_set and data sections. */ - sh_data[0] = sh_data[1] = sh_meta = NULL; - for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) { - if (strcmp(&shstrtab[shdr[i].sh_name], - "set_modmetadata_set") == 0) { - sh_meta = &shdr[i]; - } - if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) || - (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) { - sh_data[j++] = &shdr[i]; - } - } - if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "load_modmetadata: unable to find set_modmetadata_set or data sections\n"); - err = EFTYPE; - goto out; - } - - /* Load set_modmetadata_set into memory */ - err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset); - if (err != 0) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "load_modmetadata: unable to load set_modmetadata_set: %d\n", err); - goto out; - } - p_start = dest; - p_end = dest + sh_meta->sh_size; - dest += sh_meta->sh_size; - - /* Load data sections into memory. */ - err = kern_pread(ef.fd, dest, sh_data[0]->sh_size, - sh_data[0]->sh_offset); - if (err != 0) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "load_modmetadata: unable to load data: %d\n", err); - goto out; - } - - /* - * We have to increment the dest, so that the offset is the same into - * both the .rodata and .data sections. - */ - ef.off = -(sh_data[0]->sh_addr - dest); - dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr); - - err = kern_pread(ef.fd, dest, sh_data[1]->sh_size, - sh_data[1]->sh_offset); - if (err != 0) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "load_modmetadata: unable to load data: %d\n", err); - goto out; - } - - err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end); - if (err != 0) { - printf("\nelf" __XSTRING(__ELF_WORD_SIZE) - "load_modmetadata: unable to parse metadata: %d\n", err); - goto out; - } - -out: - if (shstrtab != NULL) - free(shstrtab); - if (shdr != NULL) - free(shdr); - if (ef.firstpage != NULL) - free(ef.firstpage); - if (ef.fd != -1) - close(ef.fd); - return (err); -} - -int -__elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef, - Elf_Addr p_start, Elf_Addr p_end) -{ - struct mod_metadata md; -#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 - struct mod_metadata64 md64; -#elif defined(__amd64__) && __ELF_WORD_SIZE == 32 - struct mod_metadata32 md32; -#endif - struct mod_depend *mdepend; - struct mod_version mver; - char *s; - int error, modcnt, minfolen; - Elf_Addr v, p; - - modcnt = 0; - p = p_start; - while (p < p_end) { - COPYOUT(p, &v, sizeof(v)); - error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v)); - if (error == EOPNOTSUPP) - v += ef->off; - else if (error != 0) - return (error); -#if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 - COPYOUT(v, &md64, sizeof(md64)); - error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64)); - if (error == EOPNOTSUPP) { - md64.md_cval += ef->off; - md64.md_data += ef->off; - } else 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; -#elif defined(__amd64__) && __ELF_WORD_SIZE == 32 - COPYOUT(v, &md32, sizeof(md32)); - error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32)); - if (error == EOPNOTSUPP) { - md32.md_cval += ef->off; - md32.md_data += ef->off; - } else if (error != 0) - return (error); - md.md_version = md32.md_version; - md.md_type = md32.md_type; - md.md_cval = (const char *)(uintptr_t)md32.md_cval; - md.md_data = (void *)(uintptr_t)md32.md_data; -#else - COPYOUT(v, &md, sizeof(md)); - error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md)); - if (error == EOPNOTSUPP) { - md.md_cval += ef->off; - md.md_data = (void *)((uintptr_t)md.md_data + (uintptr_t)ef->off); - } else if (error != 0) - return (error); -#endif - p += sizeof(Elf_Addr); - switch(md.md_type) { - case MDT_DEPEND: - if (ef->kernel) /* kernel must not depend on anything */ - break; - 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; - } - } - if (modcnt == 0) { - s = fake_modname(fp->f_name); - file_addmodule(fp, s, 1, NULL); - free(s); - } - return 0; -} - -static 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; -} - -static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE) "_lookup_symbol: corrupt symbol table\n"; -int -__elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef, const char* name, - Elf_Sym *symp) -{ - Elf_Hashelt symnum; - Elf_Sym sym; - char *strp; - unsigned long hash; - - hash = elf_hash(name); - COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum)); - - while (symnum != STN_UNDEF) { - if (symnum >= ef->nchains) { - printf(__elfN(bad_symtable)); - return ENOENT; - } - - COPYOUT(ef->symtab + symnum, &sym, sizeof(sym)); - if (sym.st_name == 0) { - printf(__elfN(bad_symtable)); - return ENOENT; - } - - strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name)); - if (strcmp(name, strp) == 0) { - free(strp); - if (sym.st_shndx != SHN_UNDEF || - (sym.st_value != 0 && - ELF_ST_TYPE(sym.st_info) == STT_FUNC)) { - *symp = sym; - return 0; - } - return ENOENT; - } - free(strp); - COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum)); - } - return ENOENT; -} - -/* - * 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. - * - * Returns EOPNOTSUPP if no relocation method is supplied. - */ -static int -__elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, - Elf_Addr p, void *val, size_t len) -{ - size_t n; - Elf_Rela a; - Elf_Rel r; - int error; - - /* - * The kernel is already relocated, but we still want to apply - * offset adjustments. - */ - if (ef->kernel) - return (EOPNOTSUPP); - - for (n = 0; n < ef->relsz / sizeof(r); n++) { - COPYOUT(ef->rel + n, &r, sizeof(r)); - - error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL, - ef->off, p, val, len); - if (error != 0) - return (error); - } - for (n = 0; n < ef->relasz / sizeof(a); n++) { - COPYOUT(ef->rela + n, &a, sizeof(a)); - - error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA, - ef->off, p, val, len); - if (error != 0) - return (error); - } - - return (0); -} - -static Elf_Addr -__elfN(symaddr)(struct elf_file *ef, Elf_Size symidx) -{ - - /* Symbol lookup by index not required here. */ - return (0); -} |