Branch data Line data Source code
1 : : /* Update symbol information and section index in symbol table at the
2 : : given index.
3 : : Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
4 : : This file is part of elfutils.
5 : : Written by Ulrich Drepper <drepper@redhat.com>, 2000.
6 : :
7 : : This file is free software; you can redistribute it and/or modify
8 : : it under the terms of either
9 : :
10 : : * the GNU Lesser General Public License as published by the Free
11 : : Software Foundation; either version 3 of the License, or (at
12 : : your option) any later version
13 : :
14 : : or
15 : :
16 : : * the GNU General Public License as published by the Free
17 : : Software Foundation; either version 2 of the License, or (at
18 : : your option) any later version
19 : :
20 : : or both in parallel, as here.
21 : :
22 : : elfutils is distributed in the hope that it will be useful, but
23 : : WITHOUT ANY WARRANTY; without even the implied warranty of
24 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 : : General Public License for more details.
26 : :
27 : : You should have received copies of the GNU General Public License and
28 : : the GNU Lesser General Public License along with this program. If
29 : : not, see <http://www.gnu.org/licenses/>. */
30 : :
31 : : #ifdef HAVE_CONFIG_H
32 : : # include <config.h>
33 : : #endif
34 : :
35 : : #include <gelf.h>
36 : : #include <stdlib.h>
37 : : #include <string.h>
38 : :
39 : : #include "libelfP.h"
40 : :
41 : :
42 : : int
43 : 4198 : gelf_update_symshndx (Elf_Data *symdata, Elf_Data *shndxdata, int ndx,
44 : : GElf_Sym *src, Elf32_Word srcshndx)
45 : : {
46 : 4198 : Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata;
47 : 4198 : Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata;
48 : 4198 : Elf_Scn *scn;
49 : 4198 : Elf32_Word *shndx = NULL;
50 : 4198 : int result = 0;
51 : :
52 [ + - ]: 4198 : if (symdata == NULL)
53 : : return 0;
54 : :
55 [ - + ]: 4198 : if (unlikely (symdata_scn->d.d_type != ELF_T_SYM))
56 : : {
57 : : /* The type of the data better should match. */
58 : 0 : __libelf_seterrno (ELF_E_DATA_MISMATCH);
59 : 0 : return 0;
60 : : }
61 : :
62 : 4198 : scn = symdata_scn->s;
63 : : /* We simply have to believe the user that the two sections belong to
64 : : the same ELF file. */
65 : 4198 : rwlock_wrlock (scn->elf->lock);
66 : :
67 : : /* The user is not required to pass a data descriptor for an extended
68 : : section index table. */
69 [ - + ]: 4198 : if (shndxdata_scn != NULL)
70 : : {
71 [ # # ]: 0 : if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size))
72 : : {
73 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
74 : 0 : goto out;
75 : : }
76 : :
77 : 0 : shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx];
78 : : }
79 : : /* But if s/he does not the extended sectio index must be zero. */
80 [ - + ]: 4198 : else if (unlikely (srcshndx != 0))
81 : : {
82 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
83 : 0 : goto out;
84 : : }
85 : :
86 [ + + ]: 4198 : if (scn->elf->class == ELFCLASS32)
87 : : {
88 : 1241 : Elf32_Sym *sym;
89 : :
90 : : /* There is the possibility that the values in the input are
91 : : too large. */
92 [ + - ]: 1241 : if (unlikely (src->st_value > 0xffffffffull)
93 [ - + ]: 1241 : || unlikely (src->st_size > 0xffffffffull))
94 : : {
95 : 0 : __libelf_seterrno (ELF_E_INVALID_DATA);
96 : 0 : goto out;
97 : : }
98 : :
99 : : /* Check whether we have to resize the data buffer. */
100 [ - + ]: 1241 : if (INVALID_NDX (ndx, Elf32_Sym, &symdata_scn->d))
101 : : {
102 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
103 : 0 : goto out;
104 : : }
105 : :
106 : 1241 : sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx];
107 : :
108 : : #define COPY(name) \
109 : : sym->name = src->name
110 : 1241 : COPY (st_name);
111 : 1241 : COPY (st_value);
112 : 1241 : COPY (st_size);
113 : : /* Please note that we can simply copy the `st_info' element since
114 : : the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
115 : : for the 64 bit variant. */
116 : 1241 : COPY (st_info);
117 : 1241 : COPY (st_other);
118 : 1241 : COPY (st_shndx);
119 : : }
120 : : else
121 : : {
122 : : /* Check whether we have to resize the data buffer. */
123 [ - + ]: 2957 : if (INVALID_NDX (ndx, Elf64_Sym, &symdata_scn->d))
124 : : {
125 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
126 : 0 : goto out;
127 : : }
128 : :
129 : 2957 : ((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src;
130 : : }
131 : :
132 : : /* Now we can store the section index. */
133 [ - + ]: 4198 : if (shndx != NULL)
134 : 0 : *shndx = srcshndx;
135 : :
136 : 4198 : result = 1;
137 : :
138 : : /* Mark the section as modified. */
139 : 4198 : scn->flags |= ELF_F_DIRTY;
140 : :
141 : 4198 : out:
142 : 4198 : rwlock_unlock (scn->elf->lock);
143 : :
144 : 4198 : return result;
145 : : }
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