1 /* Update program header program header table entry. 2 Copyright (C) 2000-2010 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_phdr (Elf *elf, int ndx, GElf_Phdr *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_Phdr *phdr = elf->state.elf32.phdr; 59 60 /* We have to convert the data to the 32 bit format. This might 61 overflow some fields so we have to test for this case before 62 copying. */ 63 if (unlikely (src->p_offset > 0xffffffffull) 64 || unlikely (src->p_vaddr > 0xffffffffull) 65 || unlikely (src->p_paddr > 0xffffffffull) 66 || unlikely (src->p_filesz > 0xffffffffull) 67 || unlikely (src->p_memsz > 0xffffffffull) 68 || unlikely (src->p_align > 0xffffffffull)) 69 { 70 __libelf_seterrno (ELF_E_INVALID_DATA); 71 goto out; 72 } 73 74 if (phdr == NULL) 75 { 76 phdr = __elf32_getphdr_wrlock (elf); 77 if (phdr == NULL) 78 /* The error number is already set. */ 79 goto out; 80 } 81 82 /* Test whether the index is ok. */ 83 size_t phnum; 84 if (ndx >= elf->state.elf32.ehdr->e_phnum 85 && (elf->state.elf32.ehdr->e_phnum != PN_XNUM 86 || __elf_getphdrnum_rdlock (elf, &phnum) != 0 87 || (size_t) ndx >= phnum)) 88 { 89 __libelf_seterrno (ELF_E_INVALID_INDEX); 90 goto out; 91 } 92 93 /* Now correct the pointer to point to the correct element. */ 94 phdr += ndx; 95 96 #define COPY(name) \ 97 phdr->name = src->name 98 COPY (p_type); 99 COPY (p_offset); 100 COPY (p_vaddr); 101 COPY (p_paddr); 102 COPY (p_filesz); 103 COPY (p_memsz); 104 COPY (p_flags); 105 COPY (p_align); 106 } 107 else 108 { 109 Elf64_Phdr *phdr = elf->state.elf64.phdr; 110 111 if (phdr == NULL) 112 { 113 phdr = __elf64_getphdr_wrlock (elf); 114 if (phdr == NULL) 115 /* The error number is already set. */ 116 goto out; 117 } 118 119 /* Test whether the index is ok. */ 120 size_t phnum; 121 if (ndx >= elf->state.elf64.ehdr->e_phnum 122 && (elf->state.elf64.ehdr->e_phnum != PN_XNUM 123 || __elf_getphdrnum_rdlock (elf, &phnum) != 0 124 || (size_t) ndx >= phnum)) 125 { 126 __libelf_seterrno (ELF_E_INVALID_INDEX); 127 goto out; 128 } 129 130 /* Just copy the data. */ 131 memcpy (phdr + ndx, src, sizeof (Elf64_Phdr)); 132 } 133 134 /* Mark the program header as modified. */ 135 elf->state.elf.phdr_flags |= ELF_F_DIRTY; 136 137 result = 1; 138 139 out: 140 rwlock_unlock (elf->lock); 141 142 return result; 143 } 144
