1 /*-
2 * Copyright (c) 2006,2008 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <assert.h>
28 #include <gelf.h>
29
30 #include "_libelf.h"
31
32 ELFTC_VCSID("$Id: gelf_symshndx.c 3174 2015-03-27 17:13:41Z emaste $");
33
34 GElf_Sym *
gelf_getsymshndx(Elf_Data * d,Elf_Data * id,int ndx,GElf_Sym * dst,Elf32_Word * shindex)35 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
36 Elf32_Word *shindex)
37 {
38 int ec;
39 Elf *e;
40 size_t msz;
41 Elf_Scn *scn;
42 uint32_t sh_type;
43 struct _Libelf_Data *ld, *lid;
44
45 ld = (struct _Libelf_Data *) d;
46 lid = (struct _Libelf_Data *) id;
47
48 if (gelf_getsym(d, ndx, dst) == 0)
49 return (NULL);
50
51 if (lid == NULL || (scn = lid->d_scn) == NULL ||
52 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf) ||
53 shindex == NULL) {
54 LIBELF_SET_ERROR(ARGUMENT, 0);
55 return (NULL);
56 }
57
58 ec = e->e_class;
59 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
60
61 if (ec == ELFCLASS32)
62 sh_type = scn->s_shdr.s_shdr32.sh_type;
63 else
64 sh_type = scn->s_shdr.s_shdr64.sh_type;
65
66 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
67 id->d_type != ELF_T_WORD) {
68 LIBELF_SET_ERROR(ARGUMENT, 0);
69 return (NULL);
70 }
71
72 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
73
74 assert(msz > 0);
75 assert(ndx >= 0);
76
77 if (msz * (size_t) ndx >= id->d_size) {
78 LIBELF_SET_ERROR(ARGUMENT, 0);
79 return (NULL);
80 }
81
82 *shindex = ((Elf32_Word *) id->d_buf)[ndx];
83
84 return (dst);
85 }
86
87 int
gelf_update_symshndx(Elf_Data * d,Elf_Data * id,int ndx,GElf_Sym * gs,Elf32_Word xindex)88 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
89 Elf32_Word xindex)
90 {
91 int ec;
92 Elf *e;
93 size_t msz;
94 Elf_Scn *scn;
95 uint32_t sh_type;
96 struct _Libelf_Data *ld, *lid;
97
98 ld = (struct _Libelf_Data *) d;
99 lid = (struct _Libelf_Data *) id;
100
101 if (gelf_update_sym(d, ndx, gs) == 0)
102 return (0);
103
104 if (lid == NULL || (scn = lid->d_scn) == NULL ||
105 (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
106 LIBELF_SET_ERROR(ARGUMENT, 0);
107 return (0);
108 }
109
110 ec = e->e_class;
111 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
112
113 if (ec == ELFCLASS32)
114 sh_type = scn->s_shdr.s_shdr32.sh_type;
115 else
116 sh_type = scn->s_shdr.s_shdr64.sh_type;
117
118 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
119 d->d_type != ELF_T_WORD) {
120 LIBELF_SET_ERROR(ARGUMENT, 0);
121 return (0);
122 }
123
124 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
125
126 assert(msz > 0);
127 assert(ndx >= 0);
128
129 if (msz * (size_t) ndx >= id->d_size) {
130 LIBELF_SET_ERROR(ARGUMENT, 0);
131 return (0);
132 }
133
134 *(((Elf32_Word *) id->d_buf) + ndx) = xindex;
135
136 return (1);
137 }
138