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#include <limits.h>
30#include <stdint.h>
31
32#include "_libelf.h"
33
34ELFTC_VCSID("$Id: gelf_cap.c 3732 2019-04-22 11:08:38Z jkoshy $");
35
36GElf_Cap *
37gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst)
38{
39	int ec;
40	Elf *e;
41	size_t msz;
42	Elf_Scn *scn;
43	Elf32_Cap *cap32;
44	Elf64_Cap *cap64;
45	uint32_t sh_type;
46	struct _Libelf_Data *d;
47
48	d = (struct _Libelf_Data *) ed;
49
50	if (d == NULL || ndx < 0 || dst == NULL ||
51	    (scn = d->d_scn) == NULL ||
52	    (e = scn->s_elf) == NULL) {
53		LIBELF_SET_ERROR(ARGUMENT, 0);
54		return (NULL);
55	}
56
57	ec = e->e_class;
58	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
59
60	if (ec == ELFCLASS32)
61		sh_type = scn->s_shdr.s_shdr32.sh_type;
62	else
63		sh_type = scn->s_shdr.s_shdr64.sh_type;
64
65	if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
66		LIBELF_SET_ERROR(ARGUMENT, 0);
67		return (NULL);
68	}
69
70	if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0)
71		return (NULL);
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		cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
81
82		dst->c_tag  = cap32->c_tag;
83		dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
84
85	} else {
86
87		cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
88
89		*dst = *cap64;
90	}
91
92	return (dst);
93}
94
95int
96gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc)
97{
98	int ec;
99	Elf *e;
100	size_t msz;
101	Elf_Scn *scn;
102	Elf32_Cap *cap32;
103	Elf64_Cap *cap64;
104	uint32_t sh_type;
105	struct _Libelf_Data *d;
106
107	d = (struct _Libelf_Data *) ed;
108
109	if (d == NULL || ndx < 0 || gc == 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_CAP) {
125		LIBELF_SET_ERROR(ARGUMENT, 0);
126		return (0);
127	}
128
129	if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0)
130		return (0);
131
132	if (msz * (size_t) ndx >= d->d_data.d_size) {
133		LIBELF_SET_ERROR(ARGUMENT, 0);
134		return (0);
135	}
136
137	if (ec == ELFCLASS32) {
138		cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
139
140		LIBELF_COPY_U32(cap32, gc, c_tag);
141		LIBELF_COPY_U32(cap32, gc, c_un.c_val);
142	} else {
143		cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
144
145		*cap64 = *gc;
146	}
147
148	return (1);
149}
150