1 /* Update ELF 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_ehdr(Elf * elf,GElf_Ehdr * src)41 gelf_update_ehdr (Elf *elf, GElf_Ehdr *src)
42 {
43 int result = 0;
44
45 if (elf == NULL)
46 return 0;
47
48 if (unlikely (elf->kind != ELF_K_ELF))
49 {
50 __libelf_seterrno (ELF_E_INVALID_HANDLE);
51 return 0;
52 }
53
54 rwlock_wrlock (elf->lock);
55
56 if (elf->class == ELFCLASS32)
57 {
58 Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
59
60 if (ehdr == NULL)
61 {
62 __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
63 goto out;
64 }
65
66 /* We have to convert the data to the 32 bit format. This might
67 overflow some fields so we have to test for this case before
68 copying. */
69 if (unlikely (src->e_entry > 0xffffffffull)
70 || unlikely (src->e_phoff > 0xffffffffull)
71 || unlikely (src->e_shoff > 0xffffffffull))
72 {
73 __libelf_seterrno (ELF_E_INVALID_DATA);
74 goto out;
75 }
76
77 /* Copy the data. */
78 memcpy (ehdr->e_ident, src->e_ident, EI_NIDENT);
79 #define COPY(name) \
80 ehdr->name = src->name
81 COPY (e_type);
82 COPY (e_machine);
83 COPY (e_version);
84 COPY (e_entry);
85 COPY (e_phoff);
86 COPY (e_shoff);
87 COPY (e_flags);
88 COPY (e_ehsize);
89 COPY (e_phentsize);
90 COPY (e_phnum);
91 COPY (e_shentsize);
92 COPY (e_shnum);
93 COPY (e_shstrndx);
94 }
95 else
96 {
97 Elf64_Ehdr *ehdr = elf->state.elf64.ehdr;
98
99 if (ehdr == NULL)
100 {
101 __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
102 goto out;
103 }
104
105 /* Just copy the data. */
106 memcpy (ehdr, src, sizeof (Elf64_Ehdr));
107 }
108
109 /* Mark the ELF header as modified. */
110 elf->state.elf.ehdr_flags |= ELF_F_DIRTY;
111
112 result = 1;
113
114 out:
115 rwlock_unlock (elf->lock);
116
117 return result;
118 }
119