310 lines
7.5 KiB
C
310 lines
7.5 KiB
C
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/* $NetBSD: nlist_elf32.c,v 1.32 2010/08/28 21:30:02 joerg Exp $ */
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the
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* NetBSD Project. See http://www.NetBSD.org/ for
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* information about NetBSD.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: nlist_elf32.c,v 1.32 2010/08/28 21:30:02 joerg Exp $");
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#endif /* LIBC_SCCS and not lint */
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/* If not included by nlist_elf64.c, ELFSIZE won't be defined. */
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#ifndef ELFSIZE
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#define ELFSIZE 32
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#endif
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/ksyms.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <nlist.h>
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#include "nlist_private.h"
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#if defined(NLIST_ELF32) || defined(NLIST_ELF64)
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#include <sys/exec_elf.h>
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#endif
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#if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
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(defined(NLIST_ELF64) && (ELFSIZE == 64))
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/* No need to check for off < 0 because it is unsigned */
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#define check(off, size) (off + size > mappedsize)
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#define BAD goto out
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#define BADUNMAP goto unmap
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int
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ELFNAMEEND(__fdnlist)(fd, list)
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int fd;
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struct nlist *list;
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{
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struct stat st;
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struct nlist *p;
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char *mappedfile, *strtab;
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size_t mappedsize;
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Elf_Ehdr *ehdrp, ehdr;
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Elf_Shdr *shdrp, *symshdrp, *symstrshdrp;
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Elf_Sym *symp;
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Elf_Off shdr_off;
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Elf_Word shdr_size;
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#if (ELFSIZE == 32)
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Elf32_Half nshdr;
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#elif (ELFSIZE == 64)
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Elf64_Word nshdr;
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#endif
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size_t i, nsyms;
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int rv, nent;
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_DIAGASSERT(fd != -1);
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_DIAGASSERT(list != NULL);
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rv = -1;
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symshdrp = symstrshdrp = NULL;
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/*
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* If we can't fstat() the file, something bad is going on.
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*/
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if (fstat(fd, &st) < 0)
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BAD;
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/*
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* Map the file in its entirety.
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*/
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if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) {
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errno = EFBIG;
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BAD;
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}
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/*
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* Read the elf header of the file.
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*/
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if ((ssize_t)(i = pread(fd, &ehdr, sizeof(Elf_Ehdr), (off_t)0)) == -1)
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BAD;
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/*
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* Check that the elf header is correct.
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*/
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if (i != sizeof(Elf_Ehdr))
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BAD;
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if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
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ehdr.e_ident[EI_CLASS] != ELFCLASS)
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BAD;
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switch (ehdr.e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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BAD;
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}
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if (S_ISCHR(st.st_mode)) {
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const char *nlistname;
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struct ksyms_gsymbol kg;
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Elf_Sym sym;
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/*
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* Character device; assume /dev/ksyms.
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*/
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nent = 0;
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for (p = list; !ISLAST(p); ++p) {
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p->n_other = 0;
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p->n_desc = 0;
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nlistname = N_NAME(p);
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if (*nlistname == '_')
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nlistname++;
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kg.kg_name = nlistname;
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kg.kg_sym = &sym;
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if (ioctl(fd, KIOCGSYMBOL, &kg) == 0) {
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p->n_value = sym.st_value;
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switch (ELF_ST_TYPE(sym.st_info)) {
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case STT_NOTYPE:
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p->n_type = N_UNDF;
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break;
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case STT_OBJECT:
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p->n_type = N_DATA;
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break;
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case STT_FUNC:
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p->n_type = N_TEXT;
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break;
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case STT_FILE:
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p->n_type = N_FN;
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break;
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default:
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p->n_type = 0;
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/* catch other enumerations for gcc */
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break;
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}
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if (ELF_ST_BIND(sym.st_info) != STB_LOCAL)
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p->n_type |= N_EXT;
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} else {
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nent++;
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p->n_value = 0;
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p->n_type = 0;
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}
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}
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return nent;
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}
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mappedsize = (size_t)st.st_size;
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mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
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fd, (off_t)0);
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if (mappedfile == (char *)-1)
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BAD;
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/*
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* Make sure we can access the executable's header
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* directly, and make sure the recognize the executable
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* as an ELF binary.
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*/
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if (check(0, sizeof *ehdrp))
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BADUNMAP;
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ehdrp = (Elf_Ehdr *)(void *)&mappedfile[0];
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/*
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* Find the symbol list and string table.
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*/
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nshdr = ehdrp->e_shnum;
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shdr_off = ehdrp->e_shoff;
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shdr_size = ehdrp->e_shentsize * nshdr;
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if (check(shdr_off, shdr_size) ||
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(sizeof *shdrp != ehdrp->e_shentsize))
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BADUNMAP;
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shdrp = (Elf_Shdr *)(void *)&mappedfile[shdr_off];
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for (i = 0; i < nshdr; i++) {
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if (shdrp[i].sh_type == SHT_SYMTAB) {
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symshdrp = &shdrp[i];
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symstrshdrp = &shdrp[shdrp[i].sh_link];
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}
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}
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/* Make sure we're not stripped. */
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if (symshdrp == NULL || symshdrp->sh_offset == 0)
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BADUNMAP;
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/* Make sure the symbols and strings are safely mapped. */
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if (check(symshdrp->sh_offset, symshdrp->sh_size))
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BADUNMAP;
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if (check(symstrshdrp->sh_offset, symstrshdrp->sh_size))
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BADUNMAP;
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symp = (Elf_Sym *)(void *)&mappedfile[symshdrp->sh_offset];
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nsyms = symshdrp->sh_size / sizeof(*symp);
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strtab = &mappedfile[symstrshdrp->sh_offset];
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/*
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* Clean out any left-over information for all valid entries.
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* Type and value are defined to be 0 if not found; historical
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* versions cleared other and desc as well.
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*
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* XXX Clearing anything other than n_type and n_value violates
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* the semantics given in the man page.
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*/
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nent = 0;
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for (p = list; !ISLAST(p); ++p) {
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p->n_type = 0;
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p->n_other = 0;
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p->n_desc = 0;
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p->n_value = 0;
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++nent;
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}
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for (i = 0; i < nsyms; i++) {
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for (p = list; !ISLAST(p); ++p) {
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const char *nlistname;
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char *symtabname;
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/* This may be incorrect */
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nlistname = N_NAME(p);
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if (*nlistname == '_')
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nlistname++;
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symtabname = &strtab[symp[i].st_name];
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if (!strcmp(symtabname, nlistname)) {
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/*
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* Translate (roughly) from ELF to nlist
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*/
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p->n_value = symp[i].st_value;
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switch (ELF_ST_TYPE(symp[i].st_info)) {
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case STT_NOTYPE:
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p->n_type = N_UNDF;
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break;
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case STT_OBJECT:
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p->n_type = N_DATA;
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break;
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case STT_FUNC:
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p->n_type = N_TEXT;
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break;
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case STT_FILE:
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p->n_type = N_FN;
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break;
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default:
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/* catch other enumerations for gcc */
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break;
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}
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if (ELF_ST_BIND(symp[i].st_info) != STB_LOCAL)
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p->n_type |= N_EXT;
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p->n_desc = 0; /* XXX */
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p->n_other = 0; /* XXX */
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if (--nent <= 0)
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goto done;
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break; /* into next run of outer loop */
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}
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}
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}
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done:
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rv = nent;
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unmap:
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munmap(mappedfile, mappedsize);
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out:
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return (rv);
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}
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#endif
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