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exec_elf32.c revision 1.9.40.1
      1  1.9.40.1     snj /* $NetBSD: exec_elf32.c,v 1.9.40.1 2009/10/04 00:20:59 snj Exp $ */
      2       1.1     cgd 
      3       1.1     cgd /*
      4       1.8     cgd  * Copyright (c) 1996 Christopher G. Demetriou
      5       1.8     cgd  * All rights reserved.
      6       1.8     cgd  *
      7       1.1     cgd  * Redistribution and use in source and binary forms, with or without
      8       1.1     cgd  * modification, are permitted provided that the following conditions
      9       1.1     cgd  * are met:
     10       1.1     cgd  * 1. Redistributions of source code must retain the above copyright
     11       1.1     cgd  *    notice, this list of conditions and the following disclaimer.
     12       1.1     cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13       1.1     cgd  *    notice, this list of conditions and the following disclaimer in the
     14       1.1     cgd  *    documentation and/or other materials provided with the distribution.
     15       1.9     cgd  * 3. The name of the author may not be used to endorse or promote products
     16       1.8     cgd  *    derived from this software without specific prior written permission.
     17       1.8     cgd  *
     18       1.1     cgd  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19       1.1     cgd  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20       1.1     cgd  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21       1.1     cgd  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22       1.1     cgd  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23       1.1     cgd  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24       1.1     cgd  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25       1.1     cgd  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26       1.1     cgd  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27       1.1     cgd  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28       1.8     cgd  *
     29       1.9     cgd  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
     30       1.1     cgd  */
     31       1.1     cgd 
     32       1.2   lukem #include <sys/cdefs.h>
     33       1.1     cgd #ifndef lint
     34  1.9.40.1     snj __RCSID("$NetBSD: exec_elf32.c,v 1.9.40.1 2009/10/04 00:20:59 snj Exp $");
     35       1.1     cgd #endif /* not lint */
     36       1.1     cgd 
     37       1.1     cgd #ifndef ELFSIZE
     38       1.1     cgd #define	ELFSIZE		32
     39       1.1     cgd #endif
     40       1.1     cgd 
     41       1.1     cgd #include <sys/types.h>
     42       1.1     cgd #include <stdio.h>
     43       1.1     cgd #include <string.h>
     44       1.1     cgd #include "extern.h"
     45       1.1     cgd 
     46       1.1     cgd #if defined(NLIST_ELF32) || defined(NLIST_ELF64)
     47       1.1     cgd #include <sys/exec_elf.h>
     48       1.1     cgd #endif
     49       1.1     cgd 
     50       1.1     cgd #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
     51       1.1     cgd     (defined(NLIST_ELF64) && (ELFSIZE == 64))
     52       1.1     cgd 
     53       1.1     cgd #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     54       1.1     cgd #define	BAD			do { rv = -1; goto out; } while (0)
     55       1.1     cgd 
     56       1.1     cgd int
     57       1.1     cgd ELFNAMEEND(check)(mappedfile, mappedsize)
     58       1.1     cgd 	const char *mappedfile;
     59       1.1     cgd 	size_t mappedsize;
     60       1.1     cgd {
     61  1.9.40.1     snj 	const Elf_Ehdr *ehdrp;
     62       1.1     cgd 	int rv;
     63       1.1     cgd 
     64       1.1     cgd 	rv = 0;
     65       1.1     cgd 
     66       1.1     cgd 	if (check(0, sizeof *ehdrp))
     67       1.1     cgd 		BAD;
     68  1.9.40.1     snj 	ehdrp = (const Elf_Ehdr *)&mappedfile[0];
     69       1.1     cgd 
     70       1.5  kleink 	if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
     71       1.5  kleink 	    ehdrp->e_ident[EI_CLASS] != ELFCLASS)
     72       1.1     cgd 		BAD;
     73       1.1     cgd 
     74       1.1     cgd 	switch (ehdrp->e_machine) {
     75       1.1     cgd 	ELFDEFNNAME(MACHDEP_ID_CASES)
     76       1.1     cgd 
     77       1.1     cgd 	default:
     78       1.1     cgd 		BAD;
     79       1.1     cgd 	}
     80       1.1     cgd 
     81       1.1     cgd out:
     82       1.1     cgd 	return (rv);
     83       1.1     cgd }
     84       1.1     cgd 
     85       1.1     cgd int
     86       1.1     cgd ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
     87       1.1     cgd 	const char *mappedfile;
     88       1.1     cgd 	size_t mappedsize, *fileoffp;
     89       1.1     cgd 	u_long vmaddr;
     90       1.1     cgd {
     91  1.9.40.1     snj 	const Elf_Ehdr *ehdrp;
     92  1.9.40.1     snj 	const Elf_Shdr *shdrp;
     93       1.1     cgd 	Elf_Off shdr_off;
     94       1.1     cgd 	Elf_Word shdr_size;
     95       1.1     cgd #if (ELFSIZE == 32)
     96       1.1     cgd 	Elf32_Half nshdr, i;
     97       1.1     cgd #elif (ELFSIZE == 64)
     98       1.1     cgd 	Elf64_Half nshdr, i;
     99       1.1     cgd #endif
    100       1.1     cgd 	int rv;
    101       1.1     cgd 
    102       1.1     cgd 	rv = 0;
    103       1.1     cgd 
    104  1.9.40.1     snj 	ehdrp = (const Elf_Ehdr *)&mappedfile[0];
    105       1.1     cgd 	nshdr = ehdrp->e_shnum;
    106       1.1     cgd 	shdr_off = ehdrp->e_shoff;
    107       1.1     cgd 	shdr_size = ehdrp->e_shentsize * nshdr;
    108       1.1     cgd 
    109  1.9.40.1     snj 	if (check(0, shdr_size + shdr_off) ||
    110       1.1     cgd 	    (sizeof *shdrp != ehdrp->e_shentsize))
    111       1.1     cgd 		BAD;
    112  1.9.40.1     snj 	shdrp = (const Elf_Shdr *)&mappedfile[shdr_off];
    113       1.1     cgd 
    114       1.1     cgd 	for (i = 0; i < nshdr; i++) {
    115       1.1     cgd 		if (shdrp[i].sh_addr <= vmaddr &&
    116       1.1     cgd 		    vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) {
    117       1.1     cgd 			*fileoffp = vmaddr -
    118       1.1     cgd 			    shdrp[i].sh_addr + shdrp[i].sh_offset;
    119       1.1     cgd 			break;
    120       1.1     cgd 		}
    121       1.1     cgd 	}
    122       1.1     cgd 	if (i == nshdr)
    123       1.1     cgd 		BAD;
    124       1.1     cgd 
    125       1.1     cgd out:
    126       1.1     cgd 	return (rv);
    127       1.1     cgd }
    128       1.1     cgd 
    129       1.1     cgd #endif /* include this size of ELF */
    130