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
32ELFTC_VCSID("$Id: gelf_syminfo.c,v 1.2 2020/05/18 06:46:23 jsg Exp $");
33
34GElf_Syminfo *
35gelf_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
95int
96gelf_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