xref: /openbsd/lib/libelf/gelf_syminfo.c (revision 63b93652)
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