Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 1 | /* Return program header table entry. |
| 2 | Copyright (C) 1998-2010 Red Hat, Inc. |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 3 | This file is part of elfutils. |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 8 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 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 |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 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 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 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/>. */ |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <gelf.h> |
| 35 | #include <string.h> |
| 36 | #include <stdbool.h> |
| 37 | |
| 38 | #include "libelfP.h" |
| 39 | |
| 40 | |
| 41 | GElf_Phdr * |
| 42 | gelf_getphdr (elf, ndx, dst) |
| 43 | Elf *elf; |
| 44 | int ndx; |
| 45 | GElf_Phdr *dst; |
| 46 | { |
| 47 | GElf_Phdr *result = NULL; |
| 48 | |
| 49 | if (elf == NULL) |
| 50 | return NULL; |
| 51 | |
| 52 | if (unlikely (elf->kind != ELF_K_ELF)) |
| 53 | { |
| 54 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 55 | return NULL; |
| 56 | } |
| 57 | |
| 58 | if (dst == NULL) |
| 59 | { |
| 60 | __libelf_seterrno (ELF_E_INVALID_OPERAND); |
| 61 | return NULL; |
| 62 | } |
| 63 | |
| 64 | rwlock_rdlock (elf->lock); |
| 65 | |
| 66 | if (elf->class == ELFCLASS32) |
| 67 | { |
| 68 | /* Copy the elements one-by-one. */ |
| 69 | Elf32_Phdr *phdr = elf->state.elf32.phdr; |
| 70 | |
| 71 | if (phdr == NULL) |
| 72 | { |
| 73 | rwlock_unlock (elf->lock); |
| 74 | phdr = INTUSE(elf32_getphdr) (elf); |
| 75 | if (phdr == NULL) |
| 76 | /* The error number is already set. */ |
| 77 | return NULL; |
| 78 | rwlock_rdlock (elf->lock); |
| 79 | } |
| 80 | |
| 81 | /* Test whether the index is ok. */ |
| 82 | size_t phnum; |
| 83 | if (ndx >= elf->state.elf32.ehdr->e_phnum |
| 84 | && (elf->state.elf32.ehdr->e_phnum != PN_XNUM |
| 85 | || __elf_getphdrnum_rdlock (elf, &phnum) != 0 |
| 86 | || (size_t) ndx >= phnum)) |
| 87 | { |
| 88 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 89 | goto out; |
| 90 | } |
| 91 | |
| 92 | /* We know the result now. */ |
| 93 | result = dst; |
| 94 | |
| 95 | /* Now correct the pointer to point to the correct element. */ |
| 96 | phdr += ndx; |
| 97 | |
| 98 | #define COPY(Name) result->Name = phdr->Name |
| 99 | COPY (p_type); |
| 100 | COPY (p_offset); |
| 101 | COPY (p_vaddr); |
| 102 | COPY (p_paddr); |
| 103 | COPY (p_filesz); |
| 104 | COPY (p_memsz); |
| 105 | COPY (p_flags); |
| 106 | COPY (p_align); |
| 107 | } |
| 108 | else |
| 109 | { |
| 110 | /* Copy the elements one-by-one. */ |
| 111 | Elf64_Phdr *phdr = elf->state.elf64.phdr; |
| 112 | |
| 113 | if (phdr == NULL) |
| 114 | { |
| 115 | rwlock_unlock (elf->lock); |
| 116 | phdr = INTUSE(elf64_getphdr) (elf); |
| 117 | if (phdr == NULL) |
| 118 | /* The error number is already set. */ |
| 119 | return NULL; |
| 120 | rwlock_rdlock (elf->lock); |
| 121 | } |
| 122 | |
| 123 | /* Test whether the index is ok. */ |
| 124 | size_t phnum; |
| 125 | if (ndx >= elf->state.elf64.ehdr->e_phnum |
| 126 | && (elf->state.elf64.ehdr->e_phnum != PN_XNUM |
| 127 | || __elf_getphdrnum_rdlock (elf, &phnum) != 0 |
| 128 | || (size_t) ndx >= phnum)) |
| 129 | { |
| 130 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 131 | goto out; |
| 132 | } |
| 133 | |
| 134 | /* We only have to copy the data. */ |
| 135 | result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr)); |
| 136 | } |
| 137 | |
| 138 | out: |
| 139 | rwlock_unlock (elf->lock); |
| 140 | |
| 141 | return result; |
| 142 | } |