1 /* Update section header.
2 Copyright (C) 2000, 2001, 2002, 2010 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@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
gelf_update_shdr(Elf_Scn * scn,GElf_Shdr * src)41 gelf_update_shdr (Elf_Scn *scn, GElf_Shdr *src)
42 {
43 int result = 0;
44 Elf *elf;
45
46 if (scn == NULL || src == NULL)
47 return 0;
48
49 elf = scn->elf;
50 rwlock_wrlock (elf->lock);
51
52 if (elf->class == ELFCLASS32)
53 {
54 Elf32_Shdr *shdr
55 = scn->shdr.e32 ?: __elf32_getshdr_wrlock (scn);
56
57 if (shdr == NULL)
58 {
59 __libelf_seterrno (ELF_E_INVALID_OPERAND);
60 goto out;
61 }
62
63 if (unlikely (src->sh_flags > 0xffffffffull)
64 || unlikely (src->sh_addr > 0xffffffffull)
65 || unlikely (src->sh_offset > 0xffffffffull)
66 || unlikely (src->sh_size > 0xffffffffull)
67 || unlikely (src->sh_addralign > 0xffffffffull)
68 || unlikely (src->sh_entsize > 0xffffffffull))
69 {
70 __libelf_seterrno (ELF_E_INVALID_DATA);
71 goto out;
72 }
73
74 #define COPY(name) \
75 shdr->name = src->name
76 COPY (sh_name);
77 COPY (sh_type);
78 COPY (sh_flags);
79 COPY (sh_addr);
80 COPY (sh_offset);
81 COPY (sh_size);
82 COPY (sh_link);
83 COPY (sh_info);
84 COPY (sh_addralign);
85 COPY (sh_entsize);
86 }
87 else
88 {
89 Elf64_Shdr *shdr
90 = scn->shdr.e64 ?: __elf64_getshdr_wrlock (scn);
91
92 if (shdr == NULL)
93 {
94 __libelf_seterrno (ELF_E_INVALID_OPERAND);
95 goto out;
96 }
97
98 /* We only have to copy the data. */
99 (void) memcpy (shdr, src, sizeof (GElf_Shdr));
100 }
101
102 /* Mark the section header as modified. */
103 scn->shdr_flags |= ELF_F_DIRTY;
104
105 result = 1;
106
107 out:
108 rwlock_unlock (elf->lock);
109
110 return result;
111 }
112