1/* @LICENSE(UNSW_OZPLB) */ 2 3/* 4 * Australian Public Licence B (OZPLB) 5 * 6 * Version 1-0 7 * 8 * Copyright (c) 2004 University of New South Wales 9 * 10 * All rights reserved. 11 * 12 * Developed by: Operating Systems and Distributed Systems Group (DiSy) 13 * University of New South Wales 14 * http://www.disy.cse.unsw.edu.au 15 * 16 * Permission is granted by University of New South Wales, free of charge, to 17 * any person obtaining a copy of this software and any associated 18 * documentation files (the "Software") to deal with the Software without 19 * restriction, including (without limitation) the rights to use, copy, 20 * modify, adapt, merge, publish, distribute, communicate to the public, 21 * sublicense, and/or sell, lend or rent out copies of the Software, and 22 * to permit persons to whom the Software is furnished to do so, subject 23 * to the following conditions: 24 * 25 * * Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimers. 27 * 28 * * Redistributions in binary form must reproduce the above 29 * copyright notice, this list of conditions and the following 30 * disclaimers in the documentation and/or other materials provided 31 * with the distribution. 32 * 33 * * Neither the name of University of New South Wales, nor the names of its 34 * contributors, may be used to endorse or promote products derived 35 * from this Software without specific prior written permission. 36 * 37 * EXCEPT AS EXPRESSLY STATED IN THIS LICENCE AND TO THE FULL EXTENT 38 * PERMITTED BY APPLICABLE LAW, THE SOFTWARE IS PROVIDED "AS-IS", AND 39 * NATIONAL ICT AUSTRALIA AND ITS CONTRIBUTORS MAKE NO REPRESENTATIONS, 40 * WARRANTIES OR CONDITIONS OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 41 * BUT NOT LIMITED TO ANY REPRESENTATIONS, WARRANTIES OR CONDITIONS 42 * REGARDING THE CONTENTS OR ACCURACY OF THE SOFTWARE, OR OF TITLE, 43 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, 44 * THE ABSENCE OF LATENT OR OTHER DEFECTS, OR THE PRESENCE OR ABSENCE OF 45 * ERRORS, WHETHER OR NOT DISCOVERABLE. 46 * 47 * TO THE FULL EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL 48 * NATIONAL ICT AUSTRALIA OR ITS CONTRIBUTORS BE LIABLE ON ANY LEGAL 49 * THEORY (INCLUDING, WITHOUT LIMITATION, IN AN ACTION OF CONTRACT, 50 * NEGLIGENCE OR OTHERWISE) FOR ANY CLAIM, LOSS, DAMAGES OR OTHER 51 * LIABILITY, INCLUDING (WITHOUT LIMITATION) LOSS OF PRODUCTION OR 52 * OPERATION TIME, LOSS, DAMAGE OR CORRUPTION OF DATA OR RECORDS; OR LOSS 53 * OF ANTICIPATED SAVINGS, OPPORTUNITY, REVENUE, PROFIT OR GOODWILL, OR 54 * OTHER ECONOMIC LOSS; OR ANY SPECIAL, INCIDENTAL, INDIRECT, 55 * CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES, ARISING OUT OF OR IN 56 * CONNECTION WITH THIS LICENCE, THE SOFTWARE OR THE USE OF OR OTHER 57 * DEALINGS WITH THE SOFTWARE, EVEN IF NATIONAL ICT AUSTRALIA OR ITS 58 * CONTRIBUTORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH CLAIM, LOSS, 59 * DAMAGES OR OTHER LIABILITY. 60 * 61 * If applicable legislation implies representations, warranties, or 62 * conditions, or imposes obligations or liability on University of New South 63 * Wales or one of its contributors in respect of the Software that 64 * cannot be wholly or partly excluded, restricted or modified, the 65 * liability of University of New South Wales or the contributor is limited, to 66 * the full extent permitted by the applicable legislation, at its 67 * option, to: 68 * a. in the case of goods, any one or more of the following: 69 * i. the replacement of the goods or the supply of equivalent goods; 70 * ii. the repair of the goods; 71 * iii. the payment of the cost of replacing the goods or of acquiring 72 * equivalent goods; 73 * iv. the payment of the cost of having the goods repaired; or 74 * b. in the case of services: 75 * i. the supplying of the services again; or 76 * ii. the payment of the cost of having the services supplied again. 77 * 78 * The construction, validity and performance of this licence is governed 79 * by the laws in force in New South Wales, Australia. 80 */ 81#include <elf/elf.h> 82#include <elf/elf32.h> 83#include <inttypes.h> 84#include <string.h> 85 86/* ELF header functions */ 87int elf32_checkFile(elf_t *elf) 88{ 89 if (elf->elfSize < sizeof(Elf32_Ehdr)) { 90 return -1; /* file smaller than ELF header */ 91 } 92 93 if (elf_check_magic(elf->elfFile) < 0) { 94 return -1; /* not an ELF file */ 95 } 96 97 Elf32_Ehdr *header = elf->elfFile; 98 if (header->e_ident[EI_CLASS] != ELFCLASS32) { 99 return -1; /* not a 32-bit ELF */ 100 } 101 102 if (header->e_phentsize != sizeof(Elf32_Phdr)) { 103 return -1; /* unexpected program header size */ 104 } 105 106 if (header->e_shentsize != sizeof(Elf32_Shdr)) { 107 return -1; /* unexpected section header size */ 108 } 109 110 if (header->e_shstrndx >= header->e_shnum) { 111 return -1; /* invalid section header string table section */ 112 } 113 114 elf->elfClass = header->e_ident[EI_CLASS]; 115 return 0; /* elf header looks OK */ 116} 117 118int elf32_checkProgramHeaderTable(elf_t *elf) 119{ 120 Elf32_Ehdr *header = elf->elfFile; 121 size_t ph_end = header->e_phoff + header->e_phentsize * header->e_phnum; 122 if (elf->elfSize < ph_end || ph_end < header->e_phoff) { 123 return -1; /* invalid program header table */ 124 } 125 126 return 0; 127} 128 129int elf32_checkSectionTable(elf_t *elf) 130{ 131 Elf32_Ehdr *header = elf->elfFile; 132 size_t sh_end = header->e_shoff + header->e_shentsize * header->e_shnum; 133 if (elf->elfSize < sh_end || sh_end < header->e_shoff) { 134 return -1; /* invalid section header table */ 135 } 136 137 return 0; 138} 139