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1 : : /* Get 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@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_Verneed * 42 : 8844 : gelf_getverneed (Elf_Data *data, int offset, GElf_Verneed *dst) 43 : : { 44 : 8844 : GElf_Verneed *result; 45 : : 46 [ - + ]: 8844 : if (data == NULL) 47 : : return NULL; 48 : : 49 [ - + ]: 8844 : if (unlikely (data->d_type != ELF_T_VNEED)) 50 : : { 51 : 0 : __libelf_seterrno (ELF_E_INVALID_HANDLE); 52 : 0 : 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 : 8844 : assert (sizeof (GElf_Verneed) == sizeof (Elf32_Verneed)); 59 : 8844 : assert (sizeof (GElf_Verneed) == sizeof (Elf64_Verneed)); 60 : 8844 : assert (sizeof (GElf_Verneed) == sizeof (Elf32_Vernaux)); 61 : 8844 : assert (sizeof (GElf_Verneed) == sizeof (Elf64_Vernaux)); 62 : : 63 : 8844 : 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 [ + - ]: 8844 : if (unlikely (offset < 0) 68 [ + - ]: 8844 : || unlikely (offset + sizeof (GElf_Verneed) > data->d_size) 69 [ - + ]: 8844 : || unlikely (offset % sizeof (GElf_Verneed) != 0)) 70 : : { 71 : 0 : __libelf_seterrno (ELF_E_OFFSET_RANGE); 72 : 0 : result = NULL; 73 : : } 74 : : else 75 : 8844 : result = (GElf_Verneed *) memcpy (dst, (char *) data->d_buf + offset, 76 : : sizeof (GElf_Verneed)); 77 : : 78 : 8844 : rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock); 79 : : 80 : 8844 : return result; 81 : : }