1 /* Update ELF header. 2 Copyright (C) 2000, 2001, 2002, 2010 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2000. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <gelf.h> 35 #include <string.h> 36 37 #include "libelfP.h" 38 39 40 int 41 gelf_update_ehdr (Elf *elf, GElf_Ehdr *src) 42 { 43 int result = 0; 44 45 if (elf == NULL) 46 return 0; 47 48 if (unlikely (elf->kind != ELF_K_ELF)) 49 { 50 __libelf_seterrno (ELF_E_INVALID_HANDLE); 51 return 0; 52 } 53 54 rwlock_wrlock (elf->lock); 55 56 if (elf->class == ELFCLASS32) 57 { 58 Elf32_Ehdr *ehdr = elf->state.elf32.ehdr; 59 60 if (ehdr == NULL) 61 { 62 __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR); 63 goto out; 64 } 65 66 /* We have to convert the data to the 32 bit format. This might 67 overflow some fields so we have to test for this case before 68 copying. */ 69 if (unlikely (src->e_entry > 0xffffffffull) 70 || unlikely (src->e_phoff > 0xffffffffull) 71 || unlikely (src->e_shoff > 0xffffffffull)) 72 { 73 __libelf_seterrno (ELF_E_INVALID_DATA); 74 goto out; 75 } 76 77 /* Copy the data. */ 78 memcpy (ehdr->e_ident, src->e_ident, EI_NIDENT); 79 #define COPY(name) \ 80 ehdr->name = src->name 81 COPY (e_type); 82 COPY (e_machine); 83 COPY (e_version); 84 COPY (e_entry); 85 COPY (e_phoff); 86 COPY (e_shoff); 87 COPY (e_flags); 88 COPY (e_ehsize); 89 COPY (e_phentsize); 90 COPY (e_phnum); 91 COPY (e_shentsize); 92 COPY (e_shnum); 93 COPY (e_shstrndx); 94 } 95 else 96 { 97 Elf64_Ehdr *ehdr = elf->state.elf64.ehdr; 98 99 if (ehdr == NULL) 100 { 101 __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR); 102 goto out; 103 } 104 105 /* Just copy the data. */ 106 memcpy (ehdr, src, sizeof (Elf64_Ehdr)); 107 } 108 109 /* Mark the ELF header as modified. */ 110 elf->state.elf.ehdr_flags |= ELF_F_DIRTY; 111 112 result = 1; 113 114 out: 115 rwlock_unlock (elf->lock); 116 117 return result; 118 } 119
