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 <gelf.h>
28 #include <libelf.h>
29 #include <limits.h>
30 #include <stdint.h>
31
32 #include "_libelf.h"
33
34 ELFTC_VCSID("$Id: gelf_phdr.c,v 1.1 2019/02/01 05:27:38 jsg Exp $");
35
36 Elf32_Phdr *
elf32_getphdr(Elf * e)37 elf32_getphdr(Elf *e)
38 {
39 return (_libelf_getphdr(e, ELFCLASS32));
40 }
41
42 Elf64_Phdr *
elf64_getphdr(Elf * e)43 elf64_getphdr(Elf *e)
44 {
45 return (_libelf_getphdr(e, ELFCLASS64));
46 }
47
48 GElf_Phdr *
gelf_getphdr(Elf * e,int index,GElf_Phdr * d)49 gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
50 {
51 int ec;
52 Elf32_Ehdr *eh32;
53 Elf64_Ehdr *eh64;
54 Elf32_Phdr *ep32;
55 Elf64_Phdr *ep64;
56 size_t phnum;
57
58 if (d == NULL || e == NULL ||
59 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
60 (e->e_kind != ELF_K_ELF) || index < 0 ||
61 elf_getphdrnum(e, &phnum) < 0) {
62 LIBELF_SET_ERROR(ARGUMENT, 0);
63 return (NULL);
64 }
65
66 if ((size_t)index >= phnum) {
67 LIBELF_SET_ERROR(ARGUMENT, 0);
68 return (NULL);
69 }
70
71 if (ec == ELFCLASS32) {
72 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
73 ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
74 return (NULL);
75
76 ep32 += index;
77
78 d->p_type = ep32->p_type;
79 d->p_offset = ep32->p_offset;
80 d->p_vaddr = (Elf64_Addr) ep32->p_vaddr;
81 d->p_paddr = (Elf64_Addr) ep32->p_paddr;
82 d->p_filesz = (Elf64_Xword) ep32->p_filesz;
83 d->p_memsz = (Elf64_Xword) ep32->p_memsz;
84 d->p_flags = ep32->p_flags;
85 d->p_align = (Elf64_Xword) ep32->p_align;
86
87 } else {
88 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
89 (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
90 return (NULL);
91
92 ep64 += index;
93
94 *d = *ep64;
95 }
96
97 return (d);
98 }
99
100 Elf32_Phdr *
elf32_newphdr(Elf * e,size_t count)101 elf32_newphdr(Elf *e, size_t count)
102 {
103 return (_libelf_newphdr(e, ELFCLASS32, count));
104 }
105
106 Elf64_Phdr *
elf64_newphdr(Elf * e,size_t count)107 elf64_newphdr(Elf *e, size_t count)
108 {
109 return (_libelf_newphdr(e, ELFCLASS64, count));
110 }
111
112 void *
gelf_newphdr(Elf * e,size_t count)113 gelf_newphdr(Elf *e, size_t count)
114 {
115 if (e == NULL) {
116 LIBELF_SET_ERROR(ARGUMENT, 0);
117 return (NULL);
118 }
119 return (_libelf_newphdr(e, e->e_class, count));
120 }
121
122 int
gelf_update_phdr(Elf * e,int ndx,GElf_Phdr * s)123 gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
124 {
125 int ec;
126 size_t phnum;
127 void *ehdr;
128 Elf32_Phdr *ph32;
129 Elf64_Phdr *ph64;
130
131 if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
132 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
133 elf_getphdrnum(e, &phnum) < 0) {
134 LIBELF_SET_ERROR(ARGUMENT, 0);
135 return (0);
136 }
137
138 if (e->e_cmd == ELF_C_READ) {
139 LIBELF_SET_ERROR(MODE, 0);
140 return (0);
141 }
142
143 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
144 return (0);
145
146 if (ndx < 0 || (size_t)ndx > phnum) {
147 LIBELF_SET_ERROR(ARGUMENT, 0);
148 return (0);
149 }
150
151 (void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
152
153 if (ec == ELFCLASS64) {
154 ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
155 *ph64 = *s;
156 return (1);
157 }
158
159 ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
160
161 ph32->p_type = s->p_type;
162 ph32->p_flags = s->p_flags;
163 LIBELF_COPY_U32(ph32, s, p_offset);
164 LIBELF_COPY_U32(ph32, s, p_vaddr);
165 LIBELF_COPY_U32(ph32, s, p_paddr);
166 LIBELF_COPY_U32(ph32, s, p_filesz);
167 LIBELF_COPY_U32(ph32, s, p_memsz);
168 LIBELF_COPY_U32(ph32, s, p_align);
169
170 return (1);
171 }
172