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