1 /* $NetBSD: exec_elf32.c,v 1.6 1999/11/04 02:00:19 erh Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: exec_elf32.c,v 1.6 1999/11/04 02:00:19 erh Exp $"); 36 #endif /* not lint */ 37 38 #ifndef ELFSIZE 39 #define ELFSIZE 32 40 #endif 41 42 #include <sys/types.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include "extern.h" 46 47 #if defined(NLIST_ELF32) || defined(NLIST_ELF64) 48 #include <sys/exec_elf.h> 49 #endif 50 51 #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \ 52 (defined(NLIST_ELF64) && (ELFSIZE == 64)) 53 54 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 55 #define BAD do { rv = -1; goto out; } while (0) 56 57 int 58 ELFNAMEEND(check)(mappedfile, mappedsize) 59 const char *mappedfile; 60 size_t mappedsize; 61 { 62 Elf_Ehdr *ehdrp; 63 int rv; 64 65 rv = 0; 66 67 if (check(0, sizeof *ehdrp)) 68 BAD; 69 ehdrp = (Elf_Ehdr *)&mappedfile[0]; 70 71 if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 || 72 ehdrp->e_ident[EI_CLASS] != ELFCLASS) 73 BAD; 74 75 switch (ehdrp->e_machine) { 76 ELFDEFNNAME(MACHDEP_ID_CASES) 77 78 default: 79 BAD; 80 } 81 82 out: 83 return (rv); 84 } 85 86 int 87 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp) 88 const char *mappedfile; 89 size_t mappedsize, *fileoffp; 90 u_long vmaddr; 91 { 92 Elf_Ehdr *ehdrp; 93 Elf_Shdr *shdrp; 94 Elf_Off shdr_off; 95 Elf_Word shdr_size; 96 #if (ELFSIZE == 32) 97 Elf32_Half nshdr, i; 98 #elif (ELFSIZE == 64) 99 Elf64_Half nshdr, i; 100 #endif 101 int rv; 102 103 rv = 0; 104 105 ehdrp = (Elf_Ehdr *)&mappedfile[0]; 106 nshdr = ehdrp->e_shnum; 107 shdr_off = ehdrp->e_shoff; 108 shdr_size = ehdrp->e_shentsize * nshdr; 109 110 if (check(shdr_off, shdr_size) || 111 (sizeof *shdrp != ehdrp->e_shentsize)) 112 BAD; 113 shdrp = (Elf_Shdr *)&mappedfile[shdr_off]; 114 115 for (i = 0; i < nshdr; i++) { 116 if (shdrp[i].sh_addr <= vmaddr && 117 vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) { 118 *fileoffp = vmaddr - 119 shdrp[i].sh_addr + shdrp[i].sh_offset; 120 break; 121 } 122 } 123 if (i == nshdr) 124 BAD; 125 126 out: 127 return (rv); 128 } 129 130 #endif /* include this size of ELF */ 131