1 /* $NetBSD: exec_elf32.c,v 1.12 2010/08/28 21:30:03 joerg 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 1.12 2010/08/28 21:30:03 joerg 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 const Elf_Ehdr *ehdrp; 62 int rv; 63 64 rv = 0; 65 66 if (check(0, sizeof *ehdrp)) 67 BAD; 68 ehdrp = (const 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 const Elf_Ehdr *ehdrp; 92 const Elf_Phdr *phdrp; 93 Elf_Off phdr_off; 94 Elf_Word phdr_size; 95 #if (ELFSIZE == 32) 96 Elf32_Half nphdr, i; 97 #elif (ELFSIZE == 64) 98 Elf64_Word nphdr, i; 99 #endif 100 int rv; 101 102 rv = 0; 103 104 ehdrp = (const Elf_Ehdr *)&mappedfile[0]; 105 nphdr = ehdrp->e_phnum; 106 phdr_off = ehdrp->e_phoff; 107 phdr_size = sizeof(Elf_Phdr) * nphdr; 108 109 if (check(0, phdr_off + phdr_size)) 110 BAD; 111 phdrp = (const Elf_Phdr *)&mappedfile[phdr_off]; 112 113 #define IS_TEXT(p) (p.p_flags & PF_X) 114 #define IS_DATA(p) (p.p_flags & PF_W) 115 116 for (i = 0; i < nphdr; i++) { 117 if ((IS_TEXT(phdrp[i]) || IS_DATA(phdrp[i])) && 118 phdrp[i].p_vaddr <= vmaddr && 119 vmaddr < phdrp[i].p_vaddr + phdrp[i].p_filesz) { 120 *fileoffp = vmaddr - 121 phdrp[i].p_vaddr + phdrp[i].p_offset; 122 break; 123 } 124 } 125 if (i == nphdr) 126 BAD; 127 128 out: 129 return (rv); 130 } 131 132 #endif /* include this size of ELF */ 133