385 lines
9.5 KiB
C
385 lines
9.5 KiB
C
/* $NetBSD: nlist_elf32.c,v 1.19 2010/08/28 21:30:03 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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#ifndef lint
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__RCSID("$NetBSD: nlist_elf32.c,v 1.19 2010/08/28 21:30:03 joerg Exp $");
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#endif /* 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 <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/sysctl.h>
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#include <sys/ioctl.h>
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#include <sys/ksyms.h>
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#include <a.out.h>
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#include <db.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.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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typedef struct nlist NLIST;
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#define _strx n_un.n_strx
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#define _name n_un.n_name
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#define badfmt(str) \
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do { \
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warnx("%s: %s: %s", kfile, str, strerror(EFTYPE)); \
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punt(); \
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} while (0)
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#define check(off, size) ((off < 0) || (off + size > mappedsize))
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#define BAD do { rv = -1; goto out; } while (0)
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#define BADUNMAP do { rv = -1; goto unmap; } while (0)
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static const char *kfile;
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int
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ELFNAMEEND(create_knlist)(name, db)
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const char *name;
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DB *db;
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{
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struct stat st;
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struct nlist nbuf;
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DBT key, data;
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char *mappedfile, *symname, *nsymname, *fsymname, *tmpcp, *strtab;
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size_t mappedsize, symnamesize, fsymnamesize;
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Elf_Ehdr *ehdrp;
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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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unsigned long i, nsyms;
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int fd, rv, malloced = 0, isksyms;
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rv = -1;
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#ifdef __GNUC__
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/* fix compiler warnings */
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symshdrp = NULL;
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symstrshdrp = NULL;
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#endif
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/*
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* Open and map the whole file. If we can't open/stat it,
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* something bad is going on so we punt.
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*/
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kfile = name;
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if ((fd = open(name, O_RDONLY, 0)) < 0) {
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warn("%s", kfile);
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punt();
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}
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if (fstat(fd, &st) < 0) {
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warn("%s", kfile);
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punt();
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}
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if (st.st_size > SIZE_T_MAX)
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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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mappedfile = MAP_FAILED;
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mappedsize = st.st_size;
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isksyms = S_ISCHR(st.st_mode) &&
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strncmp(name, _PATH_KSYMS, sizeof(_PATH_KSYMS)) == 0;
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if (mappedsize == 0) {
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/* if it's a character device, stat returns size 0 */
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if (!isksyms)
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BAD;
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} else {
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mappedfile = mmap(NULL, mappedsize, PROT_READ,
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MAP_PRIVATE|MAP_FILE, fd, 0);
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}
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/*
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* If mmap failed, try to read the file instead.
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*/
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if (mappedfile == MAP_FAILED) {
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int allocsiz, readsz;
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if (isksyms != 0) {
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if (ioctl(fd, KIOCGSIZE, &allocsiz) < 0)
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BAD;
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mappedsize = allocsiz;
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} else
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allocsiz = mappedsize;
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if ((mappedfile = malloc(mappedsize)) == NULL)
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BAD;
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malloced = 1;
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if ((readsz = read(fd, mappedfile, mappedsize)) < 0)
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BADUNMAP;
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if (readsz != mappedsize) /* Sanity */
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BADUNMAP;
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}
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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 *)&mappedfile[0];
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if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
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ehdrp->e_ident[EI_CLASS] != ELFCLASS)
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BADUNMAP;
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switch (ehdrp->e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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BADUNMAP;
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}
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/*
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* We've recognized it as an ELF binary. From here
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* on out, all errors are fatal.
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*/
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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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badfmt("bogus section header table");
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shdrp = (Elf_Shdr *)&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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if (symshdrp == NULL)
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badfmt("no symbol section header found");
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if (symshdrp->sh_offset == 0)
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badfmt("stripped");
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if (check(symshdrp->sh_offset, symshdrp->sh_size))
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badfmt("bogus symbol section header");
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if (check(symstrshdrp->sh_offset, symstrshdrp->sh_size))
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badfmt("bogus symbol string section header");
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symp = (Elf_Sym *)&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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* Set up the data item, pointing to a nlist structure.
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* which we fill in for each symbol.
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*/
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data.data = (u_char *)&nbuf;
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data.size = sizeof(nbuf);
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/*
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* Create a buffer (to be expanded later, if necessary)
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* to hold symbol names after we've added underscores
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* to them.
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*/
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symnamesize = 1024;
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if ((symname = malloc(symnamesize)) == NULL) {
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warn("malloc");
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punt();
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}
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/*
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* Read each symbol and enter it into the database.
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*/
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for (i = 0; i < nsyms; i++) {
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/*
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* No symbol name; ignore this symbol.
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*/
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if (symp[i].st_name == 0)
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continue;
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/*
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* Find symbol name, copy it (with added underscore) to
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* temporary buffer, and prepare the database key for
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* insertion.
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*/
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fsymname = &strtab[symp[i].st_name];
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fsymnamesize = strlen(fsymname) + 1;
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while (symnamesize < fsymnamesize + 1) {
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if ((nsymname = realloc(symname, symnamesize * 2)) == NULL) {
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warn("malloc");
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punt();
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}
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symname = nsymname;
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symnamesize *= 2;
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}
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strlcpy(symname, "_", symnamesize);
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strlcat(symname, fsymname, symnamesize);
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key.data = symname;
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key.size = strlen((char *)key.data);
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/*
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* Convert the symbol information into an nlist structure,
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* as best we can.
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*/
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nbuf.n_value = symp[i].st_value;
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switch (ELFDEFNNAME(ST_TYPE)(symp[i].st_info)) {
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default:
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case STT_NOTYPE:
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nbuf.n_type = N_UNDF;
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break;
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case STT_OBJECT:
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nbuf.n_type = N_DATA;
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break;
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case STT_FUNC:
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nbuf.n_type = N_TEXT;
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break;
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case STT_FILE:
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nbuf.n_type = N_FN;
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break;
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}
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if (ELFDEFNNAME(ST_BIND)(symp[i].st_info) != STB_LOCAL)
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nbuf.n_type |= N_EXT;
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nbuf.n_desc = 0; /* XXX */
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nbuf.n_other = 0; /* XXX */
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/*
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* Enter the symbol into the database.
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*/
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if (db->put(db, &key, &data, 0)) {
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warn("record enter");
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punt();
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}
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/*
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* If it's the kernel version string, we've gotta keep
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* some extra data around. Under a separate key,
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* we enter the first line (i.e. up to the first newline,
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* with the newline replaced by a NUL to terminate the
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* entered string) of the version string.
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*/
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if (strcmp((char *)key.data, VRS_SYM) == 0) {
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key.data = (u_char *)VRS_KEY;
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key.size = sizeof(VRS_KEY) - 1;
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/* Find the version string, relative to its section */
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if (isksyms) {
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/* reading from /dev/ksyms, use sysctl */
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size_t sz;
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int mib[2];
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char *kv;
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mib[0] = CTL_KERN;
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mib[1] = KERN_VERSION;
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if (sysctl(mib, 2, NULL, &sz, NULL, 0) == -1) {
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warn("sysctl version size");
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punt();
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}
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if ((kv = malloc(sz)) == NULL) {
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warn("malloc version string");
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punt();
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}
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if (sysctl(mib, 2, kv, &sz, NULL, 0) == -1) {
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warn("sysctl version string");
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punt();
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}
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data.data = kv;
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} else
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data.data = strdup(&mappedfile[nbuf.n_value -
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shdrp[symp[i].st_shndx].sh_addr +
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shdrp[symp[i].st_shndx].sh_offset]);
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/* assumes newline terminates version. */
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if ((tmpcp = strchr(data.data, '\n')) != NULL)
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*tmpcp = '\0';
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data.size = strlen((char *)data.data);
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if (db->put(db, &key, &data, 0)) {
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warn("record enter");
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punt();
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}
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/* free pointer created by strdup(). */
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free(data.data);
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/* Restore to original values */
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data.data = (u_char *)&nbuf;
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data.size = sizeof(nbuf);
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}
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}
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rv = 0;
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unmap:
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if (malloced)
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free(mappedfile);
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else
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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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