1 /* Update symbol information in symbol table at the given index.
2 Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 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 #include <string.h>
37
38 #include "libelfP.h"
39
40
41 int
gelf_update_sym(Elf_Data * data,int ndx,GElf_Sym * src)42 gelf_update_sym (Elf_Data *data, int ndx, GElf_Sym *src)
43 {
44 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
45 Elf_Scn *scn;
46 int result = 0;
47
48 if (data == NULL)
49 return 0;
50
51 if (unlikely (data_scn->d.d_type != ELF_T_SYM))
52 {
53 /* The type of the data better should match. */
54 __libelf_seterrno (ELF_E_DATA_MISMATCH);
55 return 0;
56 }
57
58 scn = data_scn->s;
59 rwlock_wrlock (scn->elf->lock);
60
61 if (scn->elf->class == ELFCLASS32)
62 {
63 Elf32_Sym *sym;
64
65 /* There is the possibility that the values in the input are
66 too large. */
67 if (unlikely (src->st_value > 0xffffffffull)
68 || unlikely (src->st_size > 0xffffffffull))
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_Sym, &data_scn->d))
76 {
77 __libelf_seterrno (ELF_E_INVALID_INDEX);
78 goto out;
79 }
80
81 sym = &((Elf32_Sym *) data_scn->d.d_buf)[ndx];
82
83 #define COPY(name) \
84 sym->name = src->name
85 COPY (st_name);
86 COPY (st_value);
87 COPY (st_size);
88 /* Please note that we can simply copy the `st_info' element since
89 the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
90 for the 64 bit variant. */
91 COPY (st_info);
92 COPY (st_other);
93 COPY (st_shndx);
94 }
95 else
96 {
97 /* Check whether we have to resize the data buffer. */
98 if (INVALID_NDX (ndx, Elf64_Sym, &data_scn->d))
99 {
100 __libelf_seterrno (ELF_E_INVALID_INDEX);
101 goto out;
102 }
103
104 ((Elf64_Sym *) data_scn->d.d_buf)[ndx] = *src;
105 }
106
107 result = 1;
108
109 /* Mark the section as modified. */
110 scn->flags |= ELF_F_DIRTY;
111
112 out:
113 rwlock_unlock (scn->elf->lock);
114
115 return result;
116 }
117