1 /* Test program for adding section and program headers and ehdr updates.
2 Copyright (C) 2015 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 elfutils is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19 #include <assert.h>
20 #include ELFUTILS_HEADER(elf)
21 #include <gelf.h>
22
23 #include <stdio.h>
24 #include <stdlib.h>
25
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <fcntl.h>
29 #include <unistd.h>
30
31 #include <stdbool.h>
32
33 void
check(const char * msg,bool statement)34 check (const char *msg, bool statement)
35 {
36 if (! statement)
37 {
38 fprintf (stderr, "%s FAILED\n", msg);
39 exit (-1);
40 }
41 else
42 fprintf (stderr, "%s OK\n", msg);
43 }
44
45 void
check_elf(const char * msg,bool statement)46 check_elf (const char *msg, bool statement)
47 {
48 if (! statement)
49 {
50 fprintf (stderr, "%s: %s\n", msg, elf_errmsg (-1));
51 exit (-1);
52 }
53 else
54 fprintf (stderr, "%s OK\n", msg);
55 }
56
57 void
test(Elf * elf,int class,bool layout)58 test (Elf *elf, int class, bool layout)
59 {
60 fprintf (stderr, "testing ELF class: %d, layout: %d\n", class, layout);
61
62 check_elf ("gelf_newehdr", gelf_newehdr (elf, class) != 0);
63 check_elf ("gelf_getclass", gelf_getclass (elf) == class);
64
65 check_elf ("elf_flagelf", elf_flagelf (elf, layout ? ELF_C_SET : ELF_C_CLR,
66 ELF_F_LAYOUT) != 0);
67
68 GElf_Ehdr ehdr;
69 check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
70 check ("e_shnum == 0", ehdr.e_shnum == 0);
71 check ("e_phnum == 0", ehdr.e_phnum == 0);
72 check ("e_shoff == 0", ehdr.e_shoff == 0);
73 check ("e_phoff == 0", ehdr.e_phoff == 0);
74
75 size_t shnum;
76 check_elf ("elf_getshdrnum", elf_getshdrnum (elf, &shnum) == 0);
77 check ("shnum == 0", shnum == 0);
78
79 size_t phnum;
80 check_elf ("elf_getphdrnum", elf_getphdrnum (elf, &phnum) == 0);
81 check ("phnum == 0", phnum == 0);
82
83 /* Lets fill in some info we are always responsible for. */
84 ehdr.e_ident[EI_DATA] = ELFDATANONE; /* Ask for native encoding. */
85 ehdr.e_type = ET_EXEC;
86 ehdr.e_machine = EM_386;
87 ehdr.e_version = EV_NONE; /* Ask for current version. */
88 check_elf ("gelf_update_ehdr", gelf_update_ehdr (elf, &ehdr) != 0);
89
90 check_elf ("elf_update", elf_update (elf, ELF_C_NULL) > 0);
91
92 check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
93 check ("EI_DATA", ehdr.e_ident[EI_DATA] != ELFDATANONE);
94 check ("e_version", ehdr.e_version == EV_CURRENT);
95
96 /* The sh/ph values shouldn't have changed. */
97 check ("e_shnum == 0", ehdr.e_shnum == 0);
98 check ("e_phnum == 0", ehdr.e_phnum == 0);
99 check ("e_shoff == 0", ehdr.e_shoff == 0);
100 check ("e_phoff == 0", ehdr.e_phoff == 0);
101
102 check_elf ("elf_getshdrnum", elf_getshdrnum (elf, &shnum) == 0);
103 check ("shnum == 0", shnum == 0);
104
105 check_elf ("elf_getphdrnum", elf_getphdrnum (elf, &phnum) == 0);
106 check ("phnum == 0", phnum == 0);
107
108 /* Lets add a header. */
109 check_elf ("elf_newscn", elf_newscn (elf) != NULL);
110 check_elf ("gelf_newphdr", gelf_newphdr (elf, 1) != 0);
111
112 /* If we are responsible for the layout ourselves we should also
113 tell where to put them. */
114 if (layout)
115 {
116 check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
117 /* phdrs go right after the ehdr. */
118 ehdr.e_phoff = ehdr.e_ehsize;
119 /* shdrs go right after the phdrs. */
120 ehdr.e_shoff = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
121 check_elf ("gelf_update_ehdr", gelf_update_ehdr (elf, &ehdr) != 0);
122 }
123
124 check_elf ("elf_update", elf_update (elf, ELF_C_NULL) > 0);
125
126 check_elf ("elf_getshdrnum", elf_getshdrnum (elf, &shnum) == 0);
127 check ("shnum == 1", shnum == 2); /* section zero is also created. */
128
129 check_elf ("elf_getphdrnum", elf_getphdrnum (elf, &phnum) == 0);
130 check ("phnum == 1", phnum == 1);
131
132 check_elf ("gelf_getehdr", gelf_getehdr (elf, &ehdr) != NULL);
133
134 check ("EI_DATA", ehdr.e_ident[EI_DATA] != ELFDATANONE);
135 check ("e_version", ehdr.e_version == EV_CURRENT);
136
137 check ("e_shnum == 2", ehdr.e_shnum == 2);
138 check ("e_phnum == 1", ehdr.e_phnum == 1);
139 check ("e_shoff != 0", ehdr.e_shoff != 0);
140 check ("e_phoff != 0", ehdr.e_phoff != 0);
141
142 size_t shentsize = (class == ELFCLASS32
143 ? sizeof (Elf32_Shdr) : sizeof (Elf64_Shdr));
144 check ("e_shentsize", ehdr.e_shentsize == shentsize);
145 size_t phentsize = (class == ELFCLASS32
146 ? sizeof (Elf32_Phdr) : sizeof (Elf64_Phdr));
147 check ("e_phentsize", ehdr.e_phentsize == phentsize);
148 }
149
150 int
main(int argc,char ** argv __attribute ((unused)))151 main (int argc __attribute__ ((unused)), char **argv __attribute ((unused)))
152 {
153 elf_version (EV_CURRENT);
154
155 int fd = open("/dev/null", O_WRONLY);
156 check ("open", fd >= 0);
157
158 Elf *elf;
159
160 elf = elf_begin (fd, ELF_C_WRITE, NULL);
161 check_elf ("elf_begin", elf != NULL);
162 test (elf, ELFCLASS32, false);
163 elf_end (elf);
164
165 elf = elf_begin (fd, ELF_C_WRITE, NULL);
166 check_elf ("elf_begin", elf != NULL);
167 test (elf, ELFCLASS32, true);
168 elf_end (elf);
169
170 elf = elf_begin (fd, ELF_C_WRITE, NULL);
171 check_elf ("elf_begin", elf != NULL);
172 test (elf, ELFCLASS64, false);
173 elf_end (elf);
174
175 elf = elf_begin (fd, ELF_C_WRITE, NULL);
176 check_elf ("elf_begin", elf != NULL);
177 test (elf, ELFCLASS64, true);
178 elf_end (elf);
179
180 close (fd);
181 return 0;
182 }
183