aboutsummaryrefslogtreecommitdiff
path: root/src/common/linux/file_id_unittest.cc
blob: 3a8193034887db39f0c6b4b139afbb89f297af87 (plain)
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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
// Copyright (c) 2010, 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.

// Unit tests for FileID

#include <elf.h>
#include <stdlib.h>

#include <string>
#include <vector>

#include "common/linux/elf_gnu_compat.h"
#include "common/linux/elfutils.h"
#include "common/linux/file_id.h"
#include "common/linux/safe_readlink.h"
#include "common/linux/synth_elf.h"
#include "common/test_assembler.h"
#include "common/tests/auto_tempdir.h"
#include "common/using_std_string.h"
#include "breakpad_googletest_includes.h"

using namespace google_breakpad;
using google_breakpad::synth_elf::ELF;
using google_breakpad::synth_elf::Notes;
using google_breakpad::test_assembler::kLittleEndian;
using google_breakpad::test_assembler::Section;
using std::vector;
using ::testing::Types;

namespace {

// Simply calling Section::Append(size, byte) produces a uninteresting pattern
// that tends to get hashed to 0000...0000. This populates the section with
// data to produce better hashes.
void PopulateSection(Section* section, int size, int prime_number) {
  for (int i = 0; i < size; i++)
    section->Append(1, (i % prime_number) % 256);
}

typedef wasteful_vector<uint8_t> id_vector;

}  // namespace

#ifndef __ANDROID__
// This test is disabled on Android: It will always fail, since there is no
// 'strip' binary installed on test devices.
TEST(FileIDStripTest, StripSelf) {
  // Calculate the File ID of this binary using
  // FileID::ElfFileIdentifier, then make a copy of this binary,
  // strip it, and ensure that the result is the same.
  char exe_name[PATH_MAX];
  ASSERT_TRUE(SafeReadLink("/proc/self/exe", exe_name));

  // copy our binary to a temp file, and strip it
  AutoTempDir temp_dir;
  string templ = temp_dir.path() + "/file-id-unittest";
  char cmdline[4096];
  sprintf(cmdline, "cp \"%s\" \"%s\"", exe_name, templ.c_str());
  ASSERT_EQ(0, system(cmdline)) << "Failed to execute: " << cmdline;
  sprintf(cmdline, "chmod u+w \"%s\"", templ.c_str());
  ASSERT_EQ(0, system(cmdline)) << "Failed to execute: " << cmdline;
  sprintf(cmdline, "strip \"%s\"", templ.c_str());
  ASSERT_EQ(0, system(cmdline)) << "Failed to execute: " << cmdline;

  PageAllocator allocator;
  id_vector identifier1(&allocator, kDefaultBuildIdSize);
  id_vector identifier2(&allocator, kDefaultBuildIdSize);

  FileID fileid1(exe_name);
  EXPECT_TRUE(fileid1.ElfFileIdentifier(identifier1));
  FileID fileid2(templ.c_str());
  EXPECT_TRUE(fileid2.ElfFileIdentifier(identifier2));

  string identifier_string1 =
      FileID::ConvertIdentifierToUUIDString(identifier1);
  string identifier_string2 =
      FileID::ConvertIdentifierToUUIDString(identifier2);
  EXPECT_EQ(identifier_string1, identifier_string2);
}
#endif  // !__ANDROID__

template<typename ElfClass>
class FileIDTest : public testing::Test {
public:
  void GetElfContents(ELF& elf) {
    string contents;
    ASSERT_TRUE(elf.GetContents(&contents));
    ASSERT_LT(0U, contents.size());

    elfdata_v.clear();
    elfdata_v.insert(elfdata_v.begin(), contents.begin(), contents.end());
    elfdata = &elfdata_v[0];
  }

  id_vector make_vector() {
    return id_vector(&allocator, kDefaultBuildIdSize);
  }

  template<size_t N>
  string get_file_id(const uint8_t (&data)[N]) {
    id_vector expected_identifier(make_vector());
    expected_identifier.insert(expected_identifier.end(),
                               &data[0],
                               data + N);
    return FileID::ConvertIdentifierToUUIDString(expected_identifier);
  }

  vector<uint8_t> elfdata_v;
  uint8_t* elfdata;
  PageAllocator allocator;
};

typedef Types<ElfClass32, ElfClass64> ElfClasses;

TYPED_TEST_CASE(FileIDTest, ElfClasses);

TYPED_TEST(FileIDTest, ElfClass) {
  const char expected_identifier_string[] =
      "80808080808000000000008080808080";
  const size_t kTextSectionSize = 128;

  ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
  Section text(kLittleEndian);
  for (size_t i = 0; i < kTextSectionSize; ++i) {
    text.D8(i * 3);
  }
  elf.AddSection(".text", text, SHT_PROGBITS);
  elf.Finish();
  this->GetElfContents(elf);

  id_vector identifier(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier));

  string identifier_string = FileID::ConvertIdentifierToUUIDString(identifier);
  EXPECT_EQ(expected_identifier_string, identifier_string);
}

TYPED_TEST(FileIDTest, BuildID) {
  const uint8_t kExpectedIdentifierBytes[] =
    {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13};
  const string expected_identifier_string =
      this->get_file_id(kExpectedIdentifierBytes);

  ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
  Section text(kLittleEndian);
  text.Append(4096, 0);
  elf.AddSection(".text", text, SHT_PROGBITS);
  Notes notes(kLittleEndian);
  notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifierBytes,
                sizeof(kExpectedIdentifierBytes));
  elf.AddSection(".note.gnu.build-id", notes, SHT_NOTE);
  elf.Finish();
  this->GetElfContents(elf);

  id_vector identifier(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier));
  EXPECT_EQ(sizeof(kExpectedIdentifierBytes), identifier.size());

  string identifier_string = FileID::ConvertIdentifierToUUIDString(identifier);
  EXPECT_EQ(expected_identifier_string, identifier_string);
}

// Test that a build id note with fewer bytes than usual is handled.
TYPED_TEST(FileIDTest, BuildIDShort) {
  const uint8_t kExpectedIdentifierBytes[] =
    {0x00, 0x01, 0x02, 0x03};
  const string expected_identifier_string =
      this->get_file_id(kExpectedIdentifierBytes);

  ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
  Section text(kLittleEndian);
  text.Append(4096, 0);
  elf.AddSection(".text", text, SHT_PROGBITS);
  Notes notes(kLittleEndian);
  notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifierBytes,
                sizeof(kExpectedIdentifierBytes));
  elf.AddSection(".note.gnu.build-id", notes, SHT_NOTE);
  elf.Finish();
  this->GetElfContents(elf);

  id_vector identifier(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier));
  EXPECT_EQ(sizeof(kExpectedIdentifierBytes), identifier.size());

  string identifier_string = FileID::ConvertIdentifierToUUIDString(identifier);
  EXPECT_EQ(expected_identifier_string, identifier_string);
}

// Test that a build id note with more bytes than usual is handled.
TYPED_TEST(FileIDTest, BuildIDLong) {
  const uint8_t kExpectedIdentifierBytes[] =
    {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F};
  const string expected_identifier_string =
      this->get_file_id(kExpectedIdentifierBytes);

  ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
  Section text(kLittleEndian);
  text.Append(4096, 0);
  elf.AddSection(".text", text, SHT_PROGBITS);
  Notes notes(kLittleEndian);
  notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifierBytes,
                sizeof(kExpectedIdentifierBytes));
  elf.AddSection(".note.gnu.build-id", notes, SHT_NOTE);
  elf.Finish();
  this->GetElfContents(elf);

  id_vector identifier(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier));
  EXPECT_EQ(sizeof(kExpectedIdentifierBytes), identifier.size());

  string identifier_string = FileID::ConvertIdentifierToUUIDString(identifier);
  EXPECT_EQ(expected_identifier_string, identifier_string);
}

TYPED_TEST(FileIDTest, BuildIDPH) {
  const uint8_t kExpectedIdentifierBytes[] =
    {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13};
  const string expected_identifier_string =
      this->get_file_id(kExpectedIdentifierBytes);

  ELF elf(EM_386, TypeParam::kClass, kLittleEndian);
  Section text(kLittleEndian);
  text.Append(4096, 0);
  elf.AddSection(".text", text, SHT_PROGBITS);
  Notes notes(kLittleEndian);
  notes.AddNote(0, "Linux",
                reinterpret_cast<const uint8_t *>("\0x42\0x02\0\0"), 4);
  notes.AddNote(NT_GNU_BUILD_ID, "GNU", kExpectedIdentifierBytes,
                sizeof(kExpectedIdentifierBytes));
  int note_idx = elf.AddSection(".note", notes, SHT_NOTE);
  elf.AddSegment(note_idx, note_idx, PT_NOTE);
  elf.Finish();
  this->GetElfContents(elf);

  id_vector identifier(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier));
  EXPECT_EQ(sizeof(kExpectedIdentifierBytes), identifier.size());

  string identifier_string = FileID::ConvertIdentifierToUUIDString(identifier);
  EXPECT_EQ(expected_identifier_string, identifier_string);
}

// Test to make sure two files with different text sections produce
// different hashes when not using a build id.
TYPED_TEST(FileIDTest, UniqueHashes) {
  {
    ELF elf1(EM_386, TypeParam::kClass, kLittleEndian);
    Section foo_1(kLittleEndian);
    PopulateSection(&foo_1, 32, 5);
    elf1.AddSection(".foo", foo_1, SHT_PROGBITS);
    Section text_1(kLittleEndian);
    PopulateSection(&text_1, 4096, 17);
    elf1.AddSection(".text", text_1, SHT_PROGBITS);
    elf1.Finish();
    this->GetElfContents(elf1);
  }

  id_vector identifier_1(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier_1));
  string identifier_string_1 =
      FileID::ConvertIdentifierToUUIDString(identifier_1);

  {
    ELF elf2(EM_386, TypeParam::kClass, kLittleEndian);
    Section text_2(kLittleEndian);
    Section foo_2(kLittleEndian);
    PopulateSection(&foo_2, 32, 5);
    elf2.AddSection(".foo", foo_2, SHT_PROGBITS);
    PopulateSection(&text_2, 4096, 31);
    elf2.AddSection(".text", text_2, SHT_PROGBITS);
    elf2.Finish();
    this->GetElfContents(elf2);
  }

  id_vector identifier_2(this->make_vector());
  EXPECT_TRUE(FileID::ElfFileIdentifierFromMappedFile(this->elfdata,
                                                      identifier_2));
  string identifier_string_2 =
      FileID::ConvertIdentifierToUUIDString(identifier_2);

  EXPECT_NE(identifier_string_1, identifier_string_2);
}

TYPED_TEST(FileIDTest, ConvertIdentifierToString) {
  const uint8_t kIdentifierBytes[] =
    {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F};
  const char* kExpected =
    "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";

  id_vector identifier(this->make_vector());
  identifier.insert(identifier.end(),
                    kIdentifierBytes,
                    kIdentifierBytes + sizeof(kIdentifierBytes));
  ASSERT_EQ(kExpected,
            FileID::ConvertIdentifierToString(identifier));
}