Line data Source code
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@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 7076 : gelf_getvernaux (Elf_Data *data, int offset, GElf_Vernaux *dst)
43 : {
44 : GElf_Vernaux *result;
45 :
46 7076 : if (data == NULL)
47 : return NULL;
48 :
49 7076 : 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 : 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 7076 : if (unlikely (offset < 0)
68 7076 : || unlikely (offset + sizeof (GElf_Vernaux) > data->d_size)
69 7076 : || unlikely (offset % sizeof (GElf_Vernaux) != 0))
70 : {
71 0 : __libelf_seterrno (ELF_E_OFFSET_RANGE);
72 0 : result = NULL;
73 : }
74 : else
75 14152 : 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 7076 : return result;
81 : }
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