/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <elf.h>
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <vector>

#include <android-base/file.h>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>

#include <unwindstack/Memory.h>

#include "MemoryFake.h"
#include "Symbols.h"

namespace unwindstack {

template <typename TypeParam>
class SymbolsTest : public ::testing::Test {
 protected:
  void SetUp() override { memory_.Clear(); }

  void InitSym(TypeParam* sym, uint32_t st_value, uint32_t st_size, uint32_t st_name) {
    memset(sym, 0, sizeof(*sym));
    sym->st_info = STT_FUNC;
    sym->st_value = st_value;
    sym->st_size = st_size;
    sym->st_name = st_name;
    sym->st_shndx = SHN_COMMON;
  }

  MemoryFake memory_;
};
TYPED_TEST_CASE_P(SymbolsTest);

TYPED_TEST_P(SymbolsTest, function_bounds_check) {
  Symbols symbols(0x1000, sizeof(TypeParam), sizeof(TypeParam), 0x2000, 0x100);

  TypeParam sym;
  this->InitSym(&sym, 0x5000, 0x10, 0x40);
  uint64_t offset = 0x1000;
  this->memory_.SetMemory(offset, &sym, sizeof(sym));

  std::string fake_name("fake_function");
  this->memory_.SetMemory(0x2040, fake_name.c_str(), fake_name.size() + 1);

  std::string name;
  uint64_t func_offset;
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x5000, &this->memory_, &name, &func_offset));
  ASSERT_EQ("fake_function", name);
  ASSERT_EQ(0U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x500f, &this->memory_, &name, &func_offset));
  ASSERT_EQ("fake_function", name);
  ASSERT_EQ(0xfU, func_offset);

  // Check one before and one after the function.
  ASSERT_FALSE(symbols.GetName<TypeParam>(0x4fff, &this->memory_, &name, &func_offset));
  ASSERT_FALSE(symbols.GetName<TypeParam>(0x5010, &this->memory_, &name, &func_offset));
}

TYPED_TEST_P(SymbolsTest, no_symbol) {
  Symbols symbols(0x1000, sizeof(TypeParam), sizeof(TypeParam), 0x2000, 0x100);

  TypeParam sym;
  this->InitSym(&sym, 0x5000, 0x10, 0x40);
  uint64_t offset = 0x1000;
  this->memory_.SetMemory(offset, &sym, sizeof(sym));

  std::string fake_name("fake_function");
  this->memory_.SetMemory(0x2040, fake_name.c_str(), fake_name.size() + 1);

  // First verify that we can get the name.
  std::string name;
  uint64_t func_offset;
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x5000, &this->memory_, &name, &func_offset));
  ASSERT_EQ("fake_function", name);
  ASSERT_EQ(0U, func_offset);

  // Now modify the info field so it's no longer a function.
  sym.st_info = 0;
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  // Clear the cache to force the symbol data to be re-read.
  symbols.ClearCache();
  ASSERT_FALSE(symbols.GetName<TypeParam>(0x5000, &this->memory_, &name, &func_offset));

  // Set the function back, and set the shndx to UNDEF.
  sym.st_info = STT_FUNC;
  sym.st_shndx = SHN_UNDEF;
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  // Clear the cache to force the symbol data to be re-read.
  symbols.ClearCache();
  ASSERT_FALSE(symbols.GetName<TypeParam>(0x5000, &this->memory_, &name, &func_offset));
}

TYPED_TEST_P(SymbolsTest, multiple_entries) {
  Symbols symbols(0x1000, sizeof(TypeParam) * 3, sizeof(TypeParam), 0x2000, 0x500);

  TypeParam sym;
  uint64_t offset = 0x1000;
  std::string fake_name;

  this->InitSym(&sym, 0x5000, 0x10, 0x40);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  fake_name = "function_one";
  this->memory_.SetMemory(0x2040, fake_name.c_str(), fake_name.size() + 1);
  offset += sizeof(sym);

  this->InitSym(&sym, 0x3004, 0x200, 0x100);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  fake_name = "function_two";
  this->memory_.SetMemory(0x2100, fake_name.c_str(), fake_name.size() + 1);
  offset += sizeof(sym);

  this->InitSym(&sym, 0xa010, 0x20, 0x230);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  fake_name = "function_three";
  this->memory_.SetMemory(0x2230, fake_name.c_str(), fake_name.size() + 1);

  std::string name;
  uint64_t func_offset;
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x3005, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_two", name);
  ASSERT_EQ(1U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x5004, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_one", name);
  ASSERT_EQ(4U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0xa011, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_three", name);
  ASSERT_EQ(1U, func_offset);

  // Reget some of the others to verify getting one function name doesn't
  // affect any of the next calls.
  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x5008, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_one", name);
  ASSERT_EQ(8U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x3008, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_two", name);
  ASSERT_EQ(4U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0xa01a, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_three", name);
  ASSERT_EQ(0xaU, func_offset);
}

TYPED_TEST_P(SymbolsTest, multiple_entries_nonstandard_size) {
  uint64_t entry_size = sizeof(TypeParam) + 5;
  Symbols symbols(0x1000, entry_size * 3, entry_size, 0x2000, 0x500);

  TypeParam sym;
  uint64_t offset = 0x1000;
  std::string fake_name;

  this->InitSym(&sym, 0x5000, 0x10, 0x40);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  fake_name = "function_one";
  this->memory_.SetMemory(0x2040, fake_name.c_str(), fake_name.size() + 1);
  offset += entry_size;

  this->InitSym(&sym, 0x3004, 0x200, 0x100);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  fake_name = "function_two";
  this->memory_.SetMemory(0x2100, fake_name.c_str(), fake_name.size() + 1);
  offset += entry_size;

  this->InitSym(&sym, 0xa010, 0x20, 0x230);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  fake_name = "function_three";
  this->memory_.SetMemory(0x2230, fake_name.c_str(), fake_name.size() + 1);

  std::string name;
  uint64_t func_offset;
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x3005, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_two", name);
  ASSERT_EQ(1U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0x5004, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_one", name);
  ASSERT_EQ(4U, func_offset);

  name.clear();
  ASSERT_TRUE(symbols.GetName<TypeParam>(0xa011, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function_three", name);
  ASSERT_EQ(1U, func_offset);
}

TYPED_TEST_P(SymbolsTest, symtab_value_out_of_bounds) {
  Symbols symbols_end_at_100(0x1000, sizeof(TypeParam) * 2, sizeof(TypeParam), 0x2000, 0x100);
  Symbols symbols_end_at_200(0x1000, sizeof(TypeParam) * 2, sizeof(TypeParam), 0x2000, 0x200);

  TypeParam sym;
  uint64_t offset = 0x1000;

  this->InitSym(&sym, 0x5000, 0x10, 0xfb);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  offset += sizeof(sym);

  this->InitSym(&sym, 0x3000, 0x10, 0x100);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));

  // Put the name across the end of the tab.
  std::string fake_name("fake_function");
  this->memory_.SetMemory(0x20fb, fake_name.c_str(), fake_name.size() + 1);

  std::string name;
  uint64_t func_offset;
  // Verify that we can get the function name properly for both entries.
  ASSERT_TRUE(symbols_end_at_200.GetName<TypeParam>(0x5000, &this->memory_, &name, &func_offset));
  ASSERT_EQ("fake_function", name);
  ASSERT_EQ(0U, func_offset);
  ASSERT_TRUE(symbols_end_at_200.GetName<TypeParam>(0x3000, &this->memory_, &name, &func_offset));
  ASSERT_EQ("function", name);
  ASSERT_EQ(0U, func_offset);

  // Now use the symbol table that ends at 0x100.
  ASSERT_FALSE(symbols_end_at_100.GetName<TypeParam>(0x5000, &this->memory_, &name, &func_offset));
  ASSERT_FALSE(symbols_end_at_100.GetName<TypeParam>(0x3000, &this->memory_, &name, &func_offset));
}

// Verify the entire func table is cached.
TYPED_TEST_P(SymbolsTest, symtab_read_cached) {
  Symbols symbols(0x1000, 3 * sizeof(TypeParam), sizeof(TypeParam), 0xa000, 0x1000);

  TypeParam sym;
  uint64_t offset = 0x1000;

  // Make sure that these entries are not in ascending order.
  this->InitSym(&sym, 0x5000, 0x10, 0x100);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  offset += sizeof(sym);

  this->InitSym(&sym, 0x2000, 0x300, 0x200);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  offset += sizeof(sym);

  this->InitSym(&sym, 0x1000, 0x100, 0x300);
  this->memory_.SetMemory(offset, &sym, sizeof(sym));
  offset += sizeof(sym);

  // Do call that should cache all of the entries (except the string data).
  std::string name;
  uint64_t func_offset;
  ASSERT_FALSE(symbols.GetName<TypeParam>(0x6000, &this->memory_, &name, &func_offset));
  this->memory_.Clear();
  ASSERT_FALSE(symbols.GetName<TypeParam>(0x6000, &this->memory_, &name, &func_offset));

  // Clear the memory and only put the symbol data string data in memory.
  this->memory_.Clear();

  std::string fake_name;
  fake_name = "first_entry";
  this->memory_.SetMemory(0xa100, fake_name.c_str(), fake_name.size() + 1);
  fake_name = "second_entry";
  this->memory_.SetMemory(0xa200, fake_name.c_str(), fake_name.size() + 1);
  fake_name = "third_entry";
  this->memory_.SetMemory(0xa300, fake_name.c_str(), fake_name.size() + 1);

  ASSERT_TRUE(symbols.GetName<TypeParam>(0x5001, &this->memory_, &name, &func_offset));
  ASSERT_EQ("first_entry", name);
  ASSERT_EQ(1U, func_offset);

  ASSERT_TRUE(symbols.GetName<TypeParam>(0x2002, &this->memory_, &name, &func_offset));
  ASSERT_EQ("second_entry", name);
  ASSERT_EQ(2U, func_offset);

  ASSERT_TRUE(symbols.GetName<TypeParam>(0x1003, &this->memory_, &name, &func_offset));
  ASSERT_EQ("third_entry", name);
  ASSERT_EQ(3U, func_offset);
}

TYPED_TEST_P(SymbolsTest, get_global) {
  uint64_t start_offset = 0x1000;
  uint64_t str_offset = 0xa000;
  Symbols symbols(start_offset, 4 * sizeof(TypeParam), sizeof(TypeParam), str_offset, 0x1000);

  TypeParam sym;
  memset(&sym, 0, sizeof(sym));
  sym.st_shndx = SHN_COMMON;
  sym.st_info = STT_OBJECT | (STB_GLOBAL << 4);
  sym.st_name = 0x100;
  this->memory_.SetMemory(start_offset, &sym, sizeof(sym));
  this->memory_.SetMemory(str_offset + 0x100, "global_0");

  start_offset += sizeof(sym);
  memset(&sym, 0, sizeof(sym));
  sym.st_shndx = SHN_COMMON;
  sym.st_info = STT_FUNC;
  sym.st_name = 0x200;
  sym.st_value = 0x10000;
  sym.st_size = 0x100;
  this->memory_.SetMemory(start_offset, &sym, sizeof(sym));
  this->memory_.SetMemory(str_offset + 0x200, "function_0");

  start_offset += sizeof(sym);
  memset(&sym, 0, sizeof(sym));
  sym.st_shndx = SHN_COMMON;
  sym.st_info = STT_OBJECT | (STB_GLOBAL << 4);
  sym.st_name = 0x300;
  this->memory_.SetMemory(start_offset, &sym, sizeof(sym));
  this->memory_.SetMemory(str_offset + 0x300, "global_1");

  start_offset += sizeof(sym);
  memset(&sym, 0, sizeof(sym));
  sym.st_shndx = SHN_COMMON;
  sym.st_info = STT_FUNC;
  sym.st_name = 0x400;
  sym.st_value = 0x12000;
  sym.st_size = 0x100;
  this->memory_.SetMemory(start_offset, &sym, sizeof(sym));
  this->memory_.SetMemory(str_offset + 0x400, "function_1");

  uint64_t offset;
  EXPECT_TRUE(symbols.GetGlobal<TypeParam>(&this->memory_, "global_0", &offset));
  EXPECT_TRUE(symbols.GetGlobal<TypeParam>(&this->memory_, "global_1", &offset));
  EXPECT_TRUE(symbols.GetGlobal<TypeParam>(&this->memory_, "global_0", &offset));
  EXPECT_TRUE(symbols.GetGlobal<TypeParam>(&this->memory_, "global_1", &offset));

  EXPECT_FALSE(symbols.GetGlobal<TypeParam>(&this->memory_, "function_0", &offset));
  EXPECT_FALSE(symbols.GetGlobal<TypeParam>(&this->memory_, "function_1", &offset));

  std::string name;
  EXPECT_TRUE(symbols.GetName<TypeParam>(0x10002, &this->memory_, &name, &offset));
  EXPECT_EQ("function_0", name);
  EXPECT_EQ(2U, offset);

  EXPECT_TRUE(symbols.GetName<TypeParam>(0x12004, &this->memory_, &name, &offset));
  EXPECT_EQ("function_1", name);
  EXPECT_EQ(4U, offset);
}

REGISTER_TYPED_TEST_CASE_P(SymbolsTest, function_bounds_check, no_symbol, multiple_entries,
                           multiple_entries_nonstandard_size, symtab_value_out_of_bounds,
                           symtab_read_cached, get_global);

typedef ::testing::Types<Elf32_Sym, Elf64_Sym> SymbolsTestTypes;
INSTANTIATE_TYPED_TEST_CASE_P(, SymbolsTest, SymbolsTestTypes);

}  // namespace unwindstack
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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372