1 /* $NetBSD: gelf_cap.c,v 1.5 2024/03/03 17:37:33 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2006,2008 Joseph Koshy
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #if HAVE_NBTOOL_CONFIG_H
30 # include "nbtool_config.h"
31 #endif
32
33 #include <sys/cdefs.h>
34
35 #include <assert.h>
36 #include <gelf.h>
37 #include <limits.h>
38 #include <stdint.h>
39
40 #include "_libelf.h"
41
42 __RCSID("$NetBSD: gelf_cap.c,v 1.5 2024/03/03 17:37:33 christos Exp $");
43
44 GElf_Cap *
gelf_getcap(Elf_Data * ed,int ndx,GElf_Cap * dst)45 gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst)
46 {
47 int ec;
48 Elf *e;
49 size_t msz;
50 Elf_Scn *scn;
51 Elf32_Cap *cap32;
52 Elf64_Cap *cap64;
53 uint32_t sh_type;
54 struct _Libelf_Data *d;
55
56 d = (struct _Libelf_Data *) ed;
57
58 if (d == NULL || ndx < 0 || dst == NULL ||
59 (scn = d->d_scn) == NULL ||
60 (e = scn->s_elf) == NULL) {
61 LIBELF_SET_ERROR(ARGUMENT, 0);
62 return (NULL);
63 }
64
65 ec = e->e_class;
66 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
67
68 if (ec == ELFCLASS32)
69 sh_type = scn->s_shdr.s_shdr32.sh_type;
70 else
71 sh_type = scn->s_shdr.s_shdr64.sh_type;
72
73 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
74 LIBELF_SET_ERROR(ARGUMENT, 0);
75 return (NULL);
76 }
77
78 if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0)
79 return (NULL);
80
81 if (msz * (size_t) ndx >= d->d_data.d_size) {
82 LIBELF_SET_ERROR(ARGUMENT, 0);
83 return (NULL);
84 }
85
86 if (ec == ELFCLASS32) {
87
88 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
89
90 dst->c_tag = cap32->c_tag;
91 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
92
93 } else {
94
95 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
96
97 *dst = *cap64;
98 }
99
100 return (dst);
101 }
102
103 int
gelf_update_cap(Elf_Data * ed,int ndx,GElf_Cap * gc)104 gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc)
105 {
106 int ec;
107 Elf *e;
108 size_t msz;
109 Elf_Scn *scn;
110 Elf32_Cap *cap32;
111 Elf64_Cap *cap64;
112 uint32_t sh_type;
113 struct _Libelf_Data *d;
114
115 d = (struct _Libelf_Data *) ed;
116
117 if (d == NULL || ndx < 0 || gc == NULL ||
118 (scn = d->d_scn) == NULL ||
119 (e = scn->s_elf) == NULL) {
120 LIBELF_SET_ERROR(ARGUMENT, 0);
121 return (0);
122 }
123
124 ec = e->e_class;
125 assert(ec == ELFCLASS32 || ec == ELFCLASS64);
126
127 if (ec == ELFCLASS32)
128 sh_type = scn->s_shdr.s_shdr32.sh_type;
129 else
130 sh_type = scn->s_shdr.s_shdr64.sh_type;
131
132 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
133 LIBELF_SET_ERROR(ARGUMENT, 0);
134 return (0);
135 }
136
137 if ((msz = _libelf_msize(ELF_T_CAP, ec, e->e_version)) == 0)
138 return (0);
139
140 if (msz * (size_t) ndx >= d->d_data.d_size) {
141 LIBELF_SET_ERROR(ARGUMENT, 0);
142 return (0);
143 }
144
145 if (ec == ELFCLASS32) {
146 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
147
148 LIBELF_COPY_U32(cap32, gc, c_tag);
149 LIBELF_COPY_U32(cap32, gc, c_un.c_val);
150 } else {
151 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
152
153 *cap64 = *gc;
154 }
155
156 return (1);
157 }
158