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b08d5a8f UD |
1 | /* Update symbol information and section index in symbol table at the |
2 | given index. | |
1ccdfb68 | 3 | Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc. |
de2ed97f | 4 | This file is part of elfutils. |
b08d5a8f UD |
5 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
6 | ||
de2ed97f MW |
7 | This file is free software; you can redistribute it and/or modify |
8 | it under the terms of either | |
b08d5a8f | 9 | |
de2ed97f MW |
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 | |
361df7da UD |
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. | |
b08d5a8f | 26 | |
de2ed97f MW |
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/>. */ | |
b08d5a8f UD |
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 | |
1ccdfb68 MW |
43 | gelf_update_symshndx (Elf_Data *symdata, Elf_Data *shndxdata, int ndx, |
44 | GElf_Sym *src, Elf32_Word srcshndx) | |
b08d5a8f UD |
45 | { |
46 | Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata; | |
47 | Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata; | |
48 | Elf_Scn *scn; | |
49 | Elf32_Word *shndx = NULL; | |
50 | int result = 0; | |
51 | ||
52 | if (symdata == NULL) | |
53 | return 0; | |
54 | ||
b08d5a8f UD |
55 | if (unlikely (symdata_scn->d.d_type != ELF_T_SYM)) |
56 | { | |
57 | /* The type of the data better should match. */ | |
58 | __libelf_seterrno (ELF_E_DATA_MISMATCH); | |
59 | return 0; | |
60 | } | |
61 | ||
62 | scn = symdata_scn->s; | |
63 | /* We simply have to believe the user that the two sections belong to | |
64 | the same ELF file. */ | |
b4d6f0f8 | 65 | rwlock_wrlock (scn->elf->lock); |
b08d5a8f UD |
66 | |
67 | /* The user is not required to pass a data descriptor for an extended | |
68 | section index table. */ | |
69 | if (shndxdata_scn != NULL) | |
70 | { | |
71 | if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size)) | |
72 | { | |
73 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
74 | goto out; | |
75 | } | |
76 | ||
77 | 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 | else if (unlikely (srcshndx != 0)) | |
81 | { | |
82 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
83 | goto out; | |
84 | } | |
85 | ||
86 | if (scn->elf->class == ELFCLASS32) | |
87 | { | |
88 | Elf32_Sym *sym; | |
89 | ||
90 | /* There is the possibility that the values in the input are | |
91 | too large. */ | |
92 | if (unlikely (src->st_value > 0xffffffffull) | |
93 | || unlikely (src->st_size > 0xffffffffull)) | |
94 | { | |
95 | __libelf_seterrno (ELF_E_INVALID_DATA); | |
96 | goto out; | |
97 | } | |
98 | ||
99 | /* Check whether we have to resize the data buffer. */ | |
a9039623 | 100 | if (INVALID_NDX (ndx, Elf32_Sym, &symdata_scn->d)) |
b08d5a8f UD |
101 | { |
102 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
103 | goto out; | |
104 | } | |
105 | ||
106 | sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx]; | |
107 | ||
108 | #define COPY(name) \ | |
109 | sym->name = src->name | |
110 | COPY (st_name); | |
111 | COPY (st_value); | |
112 | 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 | COPY (st_info); | |
117 | COPY (st_other); | |
118 | COPY (st_shndx); | |
119 | } | |
120 | else | |
121 | { | |
122 | /* Check whether we have to resize the data buffer. */ | |
a9039623 | 123 | if (INVALID_NDX (ndx, Elf64_Sym, &symdata_scn->d)) |
b08d5a8f UD |
124 | { |
125 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
126 | goto out; | |
127 | } | |
128 | ||
129 | ((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src; | |
130 | } | |
131 | ||
132 | /* Now we can store the section index. */ | |
133 | if (shndx != NULL) | |
134 | *shndx = srcshndx; | |
135 | ||
136 | result = 1; | |
137 | ||
138 | /* Mark the section as modified. */ | |
139 | scn->flags |= ELF_F_DIRTY; | |
140 | ||
141 | out: | |
b4d6f0f8 | 142 | rwlock_unlock (scn->elf->lock); |
b08d5a8f UD |
143 | |
144 | return result; | |
145 | } |