1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
// Copyright (c) 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// file_id.cc: Return a unique identifier for a file
//
// See file_id.h for documentation
//
// Author: Alfred Peng
#include <elf.h>
#include <fcntl.h>
#include <gelf.h>
#include <sys/mman.h>
#include <sys/ksyms.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <cassert>
#include <cstdio>
#include "common/md5.h"
#include "common/solaris/file_id.h"
#include "common/solaris/message_output.h"
#include "google_breakpad/common/minidump_format.h"
namespace google_breakpad {
class AutoElfEnder {
public:
AutoElfEnder(Elf* elf) : elf_(elf) {}
~AutoElfEnder() { if (elf_) elf_end(elf_); }
private:
Elf* elf_;
};
// Find the text section in elf object file.
// Return the section start address and the size.
static bool FindElfTextSection(int fd, const void* elf_base,
const void** text_start,
int* text_size) {
assert(text_start);
assert(text_size);
*text_start = NULL;
*text_size = 0;
if (elf_version(EV_CURRENT) == EV_NONE) {
print_message2(2, "elf_version() failed: %s\n", elf_errmsg(0));
return false;
}
GElf_Ehdr elf_header;
lseek(fd, 0L, 0);
Elf* elf = elf_begin(fd, ELF_C_READ, NULL);
AutoElfEnder elfEnder(elf);
if (gelf_getehdr(elf, &elf_header) == (GElf_Ehdr*)NULL) {
print_message2(2, "failed to read elf header: %s\n", elf_errmsg(-1));
return false;
}
if (elf_header.e_ident[EI_MAG0] != ELFMAG0 ||
elf_header.e_ident[EI_MAG1] != ELFMAG1 ||
elf_header.e_ident[EI_MAG2] != ELFMAG2 ||
elf_header.e_ident[EI_MAG3] != ELFMAG3) {
print_message1(2, "header magic doesn't match\n");
return false;
}
static const char kTextSectionName[] = ".text";
const GElf_Shdr* text_section = NULL;
Elf_Scn* scn = NULL;
GElf_Shdr shdr;
while ((scn = elf_nextscn(elf, scn)) != NULL) {
if (gelf_getshdr(scn, &shdr) == (GElf_Shdr*)0) {
print_message2(2, "failed to read section header: %s\n", elf_errmsg(0));
return false;
}
if (shdr.sh_type == SHT_PROGBITS) {
const char* section_name = elf_strptr(elf, elf_header.e_shstrndx,
shdr.sh_name);
if (!section_name) {
print_message2(2, "Section name error: %s\n", elf_errmsg(-1));
continue;
}
if (strcmp(section_name, kTextSectionName) == 0) {
text_section = &shdr;
break;
}
}
}
if (text_section != NULL && text_section->sh_size > 0) {
*text_start = (char*)elf_base + text_section->sh_offset;
*text_size = text_section->sh_size;
return true;
}
return false;
}
FileID::FileID(const char* path) {
strcpy(path_, path);
}
class AutoCloser {
public:
AutoCloser(int fd) : fd_(fd) {}
~AutoCloser() { if (fd_) close(fd_); }
private:
int fd_;
};
bool FileID::ElfFileIdentifier(unsigned char identifier[16]) {
int fd = 0;
if ((fd = open(path_, O_RDONLY)) < 0)
return false;
AutoCloser autocloser(fd);
struct stat st;
if (fstat(fd, &st) != 0 || st.st_size <= 0)
return false;
void* base = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (base == MAP_FAILED)
return false;
bool success = false;
const void* text_section = NULL;
int text_size = 0;
if (FindElfTextSection(fd, base, &text_section, &text_size)) {
MD5Context md5;
MD5Init(&md5);
MD5Update(&md5, (const unsigned char*)text_section, text_size);
MD5Final(identifier, &md5);
success = true;
}
munmap((char*)base, st.st_size);
return success;
}
// static
bool FileID::ConvertIdentifierToString(const unsigned char identifier[16],
char* buffer, int buffer_length) {
if (buffer_length < 34)
return false;
int buffer_idx = 0;
for (int idx = 0; idx < 16; ++idx) {
int hi = (identifier[idx] >> 4) & 0x0F;
int lo = (identifier[idx]) & 0x0F;
buffer[buffer_idx++] = (hi >= 10) ? 'A' + hi - 10 : '0' + hi;
buffer[buffer_idx++] = (lo >= 10) ? 'A' + lo - 10 : '0' + lo;
}
// Add an extra "0" by the end.
buffer[buffer_idx++] = '0';
// NULL terminate
buffer[buffer_idx] = 0;
return true;
}
} // namespace google_breakpad
|
