1 /* Get additional required symbol version information at the given offset. 2 Copyright (C) 1999, 2000, 2001, 2002, 2015 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 1999. 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 <assert.h> 35 #include <gelf.h> 36 #include <string.h> 37 38 #include "libelfP.h" 39 40 41 GElf_Vernaux * 42 gelf_getvernaux (Elf_Data *data, int offset, GElf_Vernaux *dst) 43 { 44 GElf_Vernaux *result; 45 46 if (data == NULL) 47 return NULL; 48 49 if (unlikely (data->d_type != ELF_T_VNEED)) 50 { 51 __libelf_seterrno (ELF_E_INVALID_HANDLE); 52 return NULL; 53 } 54 55 /* It's easy to handle this type. It has the same size for 32 and 56 64 bit objects. And fortunately the `ElfXXX_Vernaux' records 57 also have the same size. */ 58 assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Verneed)); 59 assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Verneed)); 60 assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Vernaux)); 61 assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Vernaux)); 62 63 rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock); 64 65 /* The data is already in the correct form. Just make sure the 66 index is OK. */ 67 if (unlikely (offset < 0) 68 || unlikely (offset + sizeof (GElf_Vernaux) > data->d_size) 69 || unlikely (offset % sizeof (GElf_Vernaux) != 0)) 70 { 71 __libelf_seterrno (ELF_E_OFFSET_RANGE); 72 result = NULL; 73 } 74 else 75 result = (GElf_Vernaux *) memcpy (dst, (char *) data->d_buf + offset, 76 sizeof (GElf_Verneed)); 77 78 rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock); 79 80 return result; 81 } 82
