1 /* $NetBSD: exec_elf32.c,v 1.13 2016/09/21 16:25:41 christos 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 1.13 2016/09/21 16:25:41 christos 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)(const char *mappedfile, size_t mappedsize) 58 { 59 const Elf_Ehdr *ehdrp; 60 int rv; 61 62 rv = 0; 63 64 if (check(0, sizeof *ehdrp)) 65 BAD; 66 ehdrp = (const Elf_Ehdr *)&mappedfile[0]; 67 68 if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 || 69 ehdrp->e_ident[EI_CLASS] != ELFCLASS) 70 BAD; 71 72 switch (ehdrp->e_machine) { 73 ELFDEFNNAME(MACHDEP_ID_CASES) 74 75 default: 76 BAD; 77 } 78 79 out: 80 return (rv); 81 } 82 83 int 84 ELFNAMEEND(findoff)(const char *mappedfile, size_t mappedsize, u_long vmaddr, 85 size_t *fileoffp, u_long text_addr) 86 { 87 const Elf_Ehdr *ehdrp; 88 const Elf_Phdr *phdrp; 89 Elf_Off phdr_off; 90 Elf_Word phdr_size; 91 #if (ELFSIZE == 32) 92 Elf32_Half nphdr, i; 93 #elif (ELFSIZE == 64) 94 Elf64_Word nphdr, i; 95 #endif 96 int rv; 97 98 rv = 0; 99 100 ehdrp = (const Elf_Ehdr *)&mappedfile[0]; 101 nphdr = ehdrp->e_phnum; 102 phdr_off = ehdrp->e_phoff; 103 phdr_size = sizeof(Elf_Phdr) * nphdr; 104 105 if (check(0, phdr_off + phdr_size)) 106 BAD; 107 phdrp = (const Elf_Phdr *)&mappedfile[phdr_off]; 108 109 #define IS_TEXT(p) (p.p_flags & PF_X) 110 #define IS_DATA(p) (p.p_flags & PF_W) 111 112 for (i = 0; i < nphdr; i++) { 113 if ((IS_TEXT(phdrp[i]) || IS_DATA(phdrp[i])) && 114 phdrp[i].p_vaddr <= vmaddr && 115 vmaddr < phdrp[i].p_vaddr + phdrp[i].p_filesz) { 116 *fileoffp = vmaddr - 117 phdrp[i].p_vaddr + phdrp[i].p_offset; 118 break; 119 } 120 } 121 if (i == nphdr) 122 BAD; 123 124 out: 125 return (rv); 126 } 127 128 #endif /* include this size of ELF */ 129