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
40int
41gelf_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