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_syminfo.c,v 1.2 2020/05/18 06:46:23 jsg Exp $");
33
34 GElf_Syminfo *
gelf_getsyminfo(Elf_Data * ed,int ndx,GElf_Syminfo * dst)35 gelf_getsyminfo(Elf_Data *ed, int ndx, GElf_Syminfo *dst)
36 {
37 int ec;
38 Elf *e;
39 size_t msz;
40 Elf_Scn *scn;
41 uint32_t sh_type;
42 struct _Libelf_Data *d;
43 Elf32_Syminfo *syminfo32;
44 Elf64_Syminfo *syminfo64;
45
46 d = (struct _Libelf_Data *) ed;
47
48 if (d == NULL || ndx < 0 || dst == NULL ||
49 (scn = d->d_scn) == NULL ||
50 (e = scn->s_elf) == NULL) {
51 LIBELF_SET_ERROR(ARGUMENT, 0);
52 return (NULL);
53 }
54
55 ec = e->e_class;
56 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
57
58 if (ec == ELFCLASS32)
59 sh_type = scn->s_shdr.s_shdr32.sh_type;
60 else
61 sh_type = scn->s_shdr.s_shdr64.sh_type;
62
63 if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
64 LIBELF_SET_ERROR(ARGUMENT, 0);
65 return (NULL);
66 }
67
68 if ((msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version)) == 0)
69 return (NULL);
70
71 assert(ndx >= 0);
72
73 if (msz * (size_t) ndx >= d->d_data.d_size) {
74 LIBELF_SET_ERROR(ARGUMENT, 0);
75 return (NULL);
76 }
77
78 if (ec == ELFCLASS32) {
79
80 syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
81
82 dst->si_boundto = syminfo32->si_boundto;
83 dst->si_flags = syminfo32->si_flags;
84
85 } else {
86
87 syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
88
89 *dst = *syminfo64;
90 }
91
92 return (dst);
93 }
94
95 int
gelf_update_syminfo(Elf_Data * ed,int ndx,GElf_Syminfo * gs)96 gelf_update_syminfo(Elf_Data *ed, int ndx, GElf_Syminfo *gs)
97 {
98 int ec;
99 Elf *e;
100 size_t msz;
101 Elf_Scn *scn;
102 uint32_t sh_type;
103 struct _Libelf_Data *d;
104 Elf32_Syminfo *syminfo32;
105 Elf64_Syminfo *syminfo64;
106
107 d = (struct _Libelf_Data *) ed;
108
109 if (d == NULL || ndx < 0 || gs == NULL ||
110 (scn = d->d_scn) == NULL ||
111 (e = scn->s_elf) == NULL) {
112 LIBELF_SET_ERROR(ARGUMENT, 0);
113 return (0);
114 }
115
116 ec = e->e_class;
117 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
118
119 if (ec == ELFCLASS32)
120 sh_type = scn->s_shdr.s_shdr32.sh_type;
121 else
122 sh_type = scn->s_shdr.s_shdr64.sh_type;
123
124 if (_libelf_xlate_shtype(sh_type) != ELF_T_SYMINFO) {
125 LIBELF_SET_ERROR(ARGUMENT, 0);
126 return (0);
127 }
128
129 if ((msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version)) == 0)
130 return (0);
131
132 assert(ndx >= 0);
133
134 if (msz * (size_t) ndx >= d->d_data.d_size) {
135 LIBELF_SET_ERROR(ARGUMENT, 0);
136 return (0);
137 }
138
139 if (ec == ELFCLASS32) {
140 syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
141
142 syminfo32->si_boundto = gs->si_boundto;
143 syminfo32->si_flags = gs->si_flags;
144
145 } else {
146 syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
147
148 *syminfo64 = *gs;
149 }
150
151 return (1);
152 }
153