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Commit | Line | Data |
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6d7e8eda | 1 | /* Copyright (C) 1999-2023 Free Software Foundation, Inc. |
591e1ffb | 2 | This file is part of the GNU C Library. |
591e1ffb | 3 | |
43bc8ac6 | 4 | This program is free software; you can redistribute it and/or modify |
2e2efe65 RM |
5 | it under the terms of the GNU General Public License as published |
6 | by the Free Software Foundation; version 2 of the License, or | |
7 | (at your option) any later version. | |
591e1ffb | 8 | |
43bc8ac6 | 9 | This program is distributed in the hope that it will be useful, |
591e1ffb | 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
43bc8ac6 UD |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. | |
591e1ffb | 13 | |
43bc8ac6 | 14 | You should have received a copy of the GNU General Public License |
5a82c748 | 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. */ |
591e1ffb UD |
16 | |
17 | /* The code in this file and in readelflib is a heavily simplified | |
18 | version of the readelf program that's part of the current binutils | |
19 | development version. Besides the simplification, it has also been | |
20 | modified to read some other file formats. */ | |
21 | ||
f00b1941 | 22 | #include <a.out.h> |
591e1ffb UD |
23 | #include <elf.h> |
24 | #include <error.h> | |
591e1ffb | 25 | #include <libintl.h> |
f00b1941 | 26 | #include <link.h> |
591e1ffb UD |
27 | #include <stdio.h> |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
591e1ffb | 30 | #include <sys/mman.h> |
f00b1941 | 31 | #include <sys/param.h> |
591e1ffb | 32 | #include <sys/stat.h> |
dc95d158 | 33 | #include <gnu/lib-names.h> |
591e1ffb | 34 | |
8f480b4b | 35 | #include <ldconfig.h> |
591e1ffb UD |
36 | |
37 | #define Elf32_CLASS ELFCLASS32 | |
38 | #define Elf64_CLASS ELFCLASS64 | |
39 | ||
40 | struct known_names | |
41 | { | |
42 | const char *soname; | |
43 | int flag; | |
44 | }; | |
45 | ||
eea3dc5b L |
46 | /* Check if string corresponds to a GDB Python file. */ |
47 | static bool | |
48 | is_gdb_python_file (const char *name) | |
49 | { | |
50 | size_t len = strlen (name); | |
51 | return len > 7 && strcmp (name + len - 7, "-gdb.py") == 0; | |
52 | } | |
591e1ffb UD |
53 | |
54 | /* Returns 0 if everything is ok, != 0 in case of error. */ | |
55 | int | |
b4a555d6 | 56 | process_file (const char *real_file_name, const char *file_name, |
c628c229 AZ |
57 | const char *lib, int *flag, unsigned int *isa_level, |
58 | char **soname, int is_link, struct stat *stat_buf) | |
591e1ffb UD |
59 | { |
60 | FILE *file; | |
9fe6f636 | 61 | struct stat statbuf; |
591e1ffb UD |
62 | void *file_contents; |
63 | int ret; | |
591e1ffb UD |
64 | ElfW(Ehdr) *elf_header; |
65 | struct exec *aout_header; | |
66 | ||
67 | ret = 0; | |
8ee87859 LM |
68 | /* Just set FLAG_ELF_LIBC6 as old formats are not supported anymore. */ |
69 | *flag = FLAG_ELF_LIBC6; | |
591e1ffb UD |
70 | *soname = NULL; |
71 | ||
b4a555d6 | 72 | file = fopen (real_file_name, "rb"); |
591e1ffb UD |
73 | if (file == NULL) |
74 | { | |
75 | /* No error for stale symlink. */ | |
7ad9abc0 | 76 | if (is_link && strstr (file_name, ".so") != NULL) |
591e1ffb UD |
77 | return 1; |
78 | error (0, 0, _("Input file %s not found.\n"), file_name); | |
79 | return 1; | |
80 | } | |
81 | ||
9fe6f636 | 82 | if (fstat (fileno (file), &statbuf) < 0) |
591e1ffb UD |
83 | { |
84 | error (0, 0, _("Cannot fstat file %s.\n"), file_name); | |
e7c036b3 UD |
85 | fclose (file); |
86 | return 1; | |
87 | } | |
88 | ||
89 | /* Check that the file is large enough so that we can access the | |
90 | information. We're only checking the size of the headers here. */ | |
6dd67bd5 UD |
91 | if ((size_t) statbuf.st_size < sizeof (struct exec) |
92 | || (size_t) statbuf.st_size < sizeof (ElfW(Ehdr))) | |
e7c036b3 | 93 | { |
625ef999 UD |
94 | if (statbuf.st_size == 0) |
95 | error (0, 0, _("File %s is empty, not checked."), file_name); | |
96 | else | |
97 | { | |
98 | char buf[SELFMAG]; | |
99 | size_t n = MIN (statbuf.st_size, SELFMAG); | |
100 | if (fread (buf, n, 1, file) == 1 && memcmp (buf, ELFMAG, n) == 0) | |
101 | error (0, 0, _("File %s is too small, not checked."), file_name); | |
102 | } | |
e7c036b3 | 103 | fclose (file); |
591e1ffb UD |
104 | return 1; |
105 | } | |
106 | ||
e7c036b3 UD |
107 | file_contents = mmap (0, statbuf.st_size, PROT_READ, MAP_SHARED, |
108 | fileno (file), 0); | |
591e1ffb UD |
109 | if (file_contents == MAP_FAILED) |
110 | { | |
111 | error (0, 0, _("Cannot mmap file %s.\n"), file_name); | |
112 | fclose (file); | |
113 | return 1; | |
114 | } | |
115 | ||
116 | /* First check if this is an aout file. */ | |
117 | aout_header = (struct exec *) file_contents; | |
118 | if (N_MAGIC (*aout_header) == ZMAGIC | |
be3c40b6 RM |
119 | #ifdef QMAGIC /* Linuxism. */ |
120 | || N_MAGIC (*aout_header) == QMAGIC | |
121 | #endif | |
122 | ) | |
591e1ffb | 123 | { |
e7c036b3 | 124 | /* Aout files don't have a soname, just return the name |
27d9ffda | 125 | including the major number. */ |
591e1ffb UD |
126 | char *copy, *major, *dot; |
127 | copy = xstrdup (lib); | |
128 | major = strstr (copy, ".so."); | |
129 | if (major) | |
130 | { | |
131 | dot = strstr (major + 4, "."); | |
132 | if (dot) | |
133 | *dot = '\0'; | |
134 | } | |
135 | *soname = copy; | |
591e1ffb UD |
136 | goto done; |
137 | } | |
af1680f1 | 138 | |
591e1ffb | 139 | elf_header = (ElfW(Ehdr) *) file_contents; |
a986484f | 140 | if (memcmp (elf_header->e_ident, ELFMAG, SELFMAG) != 0) |
591e1ffb | 141 | { |
f00b1941 UD |
142 | /* The file is neither ELF nor aout. Check if it's a linker |
143 | script, like libc.so - otherwise complain. Only search the | |
144 | beginning of the file. */ | |
145 | size_t len = MIN (statbuf.st_size, 512); | |
591e1ffb | 146 | if (memmem (file_contents, len, "GROUP", 5) == NULL |
eea3dc5b L |
147 | && memmem (file_contents, len, "GNU ld script", 13) == NULL |
148 | && !is_gdb_python_file (file_name)) | |
591e1ffb UD |
149 | error (0, 0, _("%s is not an ELF file - it has the wrong magic bytes at the start.\n"), |
150 | file_name); | |
151 | ret = 1; | |
591e1ffb | 152 | } |
7220da7c AJ |
153 | /* Libraries have to be shared object files. */ |
154 | else if (elf_header->e_type != ET_DYN) | |
155 | ret = 1; | |
c628c229 AZ |
156 | else if (process_elf_file (file_name, lib, flag, isa_level, soname, |
157 | file_contents, statbuf.st_size)) | |
591e1ffb UD |
158 | ret = 1; |
159 | ||
160 | done: | |
161 | /* Clean up allocated memory and resources. */ | |
162 | munmap (file_contents, statbuf.st_size); | |
163 | fclose (file); | |
164 | ||
27d9ffda | 165 | *stat_buf = statbuf; |
591e1ffb UD |
166 | return ret; |
167 | } | |
168 | ||
169 | /* Get architecture specific version of process_elf_file. */ | |
2fdaad97 | 170 | #include <readelflib.c> |