1 /* Update REL relocation information at given index.
2 Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014 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 <stdlib.h>
36
37 #include "libelfP.h"
38
39
40 int
gelf_update_rel(Elf_Data * dst,int ndx,GElf_Rel * src)41 gelf_update_rel (Elf_Data *dst, int ndx, GElf_Rel *src)
42 {
43 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) dst;
44 Elf_Scn *scn;
45 int result = 0;
46
47 if (dst == NULL)
48 return 0;
49
50 if (unlikely (data_scn->d.d_type != ELF_T_REL))
51 {
52 /* The type of the data better should match. */
53 __libelf_seterrno (ELF_E_DATA_MISMATCH);
54 return 0;
55 }
56
57 scn = data_scn->s;
58 rwlock_wrlock (scn->elf->lock);
59
60 if (scn->elf->class == ELFCLASS32)
61 {
62 Elf32_Rel *rel;
63
64 /* There is the possibility that the values in the input are
65 too large. */
66 if (unlikely (src->r_offset > 0xffffffffull)
67 || unlikely (GELF_R_SYM (src->r_info) > 0xffffff)
68 || unlikely (GELF_R_TYPE (src->r_info) > 0xff))
69 {
70 __libelf_seterrno (ELF_E_INVALID_DATA);
71 goto out;
72 }
73
74 /* Check whether we have to resize the data buffer. */
75 if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
76 {
77 __libelf_seterrno (ELF_E_INVALID_INDEX);
78 goto out;
79 }
80
81 rel = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
82
83 rel->r_offset = src->r_offset;
84 rel->r_info = ELF32_R_INFO (GELF_R_SYM (src->r_info),
85 GELF_R_TYPE (src->r_info));
86 }
87 else
88 {
89 /* Check whether we have to resize the data buffer. */
90 if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
91 {
92 __libelf_seterrno (ELF_E_INVALID_INDEX);
93 goto out;
94 }
95
96 ((Elf64_Rel *) data_scn->d.d_buf)[ndx] = *src;
97 }
98
99 result = 1;
100
101 /* Mark the section as modified. */
102 scn->flags |= ELF_F_DIRTY;
103
104 out:
105 rwlock_unlock (scn->elf->lock);
106
107 return result;
108 }
109