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
|
/*
* Copyright (C) 2018 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 <stdint.h>
#include <stdlib.h>
#include <time.h>
#include <gtest/gtest.h>
#if defined(__BIONIC__)
#include <vector>
#include <procinfo/process_map.h>
extern "C" void malloc_disable();
extern "C" void malloc_enable();
extern "C" int malloc_iterate(uintptr_t base, size_t size, void (*callback)(uintptr_t base,
size_t size, void* arg), void* arg);
struct AllocDataType {
void* ptr;
size_t size;
size_t size_reported;
size_t count;
};
struct TestDataType {
size_t total_allocated_bytes;
std::vector<AllocDataType> allocs;
};
static void AllocPtr(TestDataType* test_data, size_t size) {
test_data->allocs.resize(test_data->allocs.size() + 1);
AllocDataType* alloc = &test_data->allocs.back();
void* ptr = malloc(size);
ASSERT_TRUE(ptr != nullptr);
alloc->ptr = ptr;
alloc->size = malloc_usable_size(ptr);
alloc->size_reported = 0;
alloc->count = 0;
}
static void FreePtrs(TestDataType* test_data) {
for (size_t i = 0; i < test_data->allocs.size(); i++) {
free(test_data->allocs[i].ptr);
}
}
static void SavePointers(uintptr_t base, size_t size, void* data) {
TestDataType* test_data = reinterpret_cast<TestDataType*>(data);
test_data->total_allocated_bytes += size;
uintptr_t end;
if (__builtin_add_overflow(base, size, &end)) {
// Skip this entry.
return;
}
for (size_t i = 0; i < test_data->allocs.size(); i++) {
uintptr_t ptr = reinterpret_cast<uintptr_t>(test_data->allocs[i].ptr);
if (ptr >= base && ptr < end) {
test_data->allocs[i].count++;
uintptr_t max_size = end - ptr;
if (max_size > test_data->allocs[i].size) {
test_data->allocs[i].size_reported = test_data->allocs[i].size;
} else {
test_data->allocs[i].size_reported = max_size;
}
}
}
}
static void VerifyPtrs(TestDataType* test_data) {
test_data->total_allocated_bytes = 0;
// Find all of the maps that are [anon:libc_malloc].
ASSERT_TRUE(android::procinfo::ReadMapFile("/proc/self/maps",
[&](uint64_t start, uint64_t end, uint16_t, uint64_t, const char* name) {
if (std::string(name) == "[anon:libc_malloc]") {
malloc_disable();
malloc_iterate(start, end - start, SavePointers, test_data);
malloc_enable();
}
}));
for (size_t i = 0; i < test_data->allocs.size(); i++) {
EXPECT_EQ(1UL, test_data->allocs[i].count) << "Failed on size " << test_data->allocs[i].size;
if (test_data->allocs[i].count == 1) {
EXPECT_EQ(test_data->allocs[i].size, test_data->allocs[i].size_reported);
}
}
}
static void AllocateSizes(TestDataType* test_data, const std::vector<size_t>& sizes) {
static constexpr size_t kInitialAllocations = 40;
static constexpr size_t kNumAllocs = 50;
for (size_t size : sizes) {
// Verify that if the tcache is enabled, that tcache pointers
// are found by allocating and freeing 20 pointers (should be larger
// than the total number of cache entries).
for (size_t i = 0; i < kInitialAllocations; i++) {
void* ptr = malloc(size);
ASSERT_TRUE(ptr != nullptr);
memset(ptr, 0, size);
free(ptr);
}
for (size_t i = 0; i < kNumAllocs; i++) {
AllocPtr(test_data, size);
}
}
}
#endif
// Verify that small allocs can be found properly.
TEST(malloc_iterate, small_allocs) {
#if defined(__BIONIC__)
TestDataType test_data;
// Try to cycle through all of the different small bins.
// This is specific to the implementation of jemalloc and should be
// adjusted if a different native memory allocator is used.
std::vector<size_t> sizes{8, 16, 32, 48, 64, 80, 96, 112, 128, 160,
192, 224, 256, 320, 384, 448, 512, 640, 768, 896,
1024, 1280, 1536, 1792, 2048, 2560, 3072, 3584, 4096, 5120,
6144, 7168, 8192, 10240, 12288, 14336, 16384, 32768, 65536};
AllocateSizes(&test_data, sizes);
SCOPED_TRACE("");
VerifyPtrs(&test_data);
FreePtrs(&test_data);
#else
GTEST_LOG_(INFO) << "Skipping, this is a bionic only test.";
#endif
}
// Verify that large allocs can be found properly.
TEST(malloc_iterate, large_allocs) {
#if defined(__BIONIC__)
TestDataType test_data;
// Try some larger sizes.
std::vector<size_t> sizes{131072, 262144, 524288, 1048576, 2097152};
AllocateSizes(&test_data, sizes);
SCOPED_TRACE("");
VerifyPtrs(&test_data);
FreePtrs(&test_data);
#else
GTEST_LOG_(INFO) << "Skipping, this is a bionic only test.";
#endif
}
// Verify that there are no crashes attempting to get pointers from
// non-allocated pointers.
TEST(malloc_iterate, invalid_pointers) {
#if defined(__BIONIC__)
TestDataType test_data = {};
// Find all of the maps that are not [anon:libc_malloc].
ASSERT_TRUE(android::procinfo::ReadMapFile("/proc/self/maps",
[&](uint64_t start, uint64_t end, uint16_t, uint64_t, const char* name) {
if (std::string(name) != "[anon:libc_malloc]") {
malloc_disable();
malloc_iterate(start, end - start, SavePointers, &test_data);
malloc_enable();
}
}));
ASSERT_EQ(0UL, test_data.total_allocated_bytes);
#else
GTEST_LOG_(INFO) << "Skipping, this is a bionic only test.";
#endif
}
TEST(malloc_iterate, malloc_disable_prevents_allocs) {
#if defined(__BIONIC__)
pid_t pid;
if ((pid = fork()) == 0) {
malloc_disable();
void* ptr = malloc(1024);
if (ptr == nullptr) {
exit(1);
}
memset(ptr, 0, 1024);
exit(0);
}
ASSERT_NE(-1, pid);
// Expect that the malloc will hang forever, and that if the process
// does not return for two seconds, it is hung.
sleep(2);
pid_t wait_pid = TEMP_FAILURE_RETRY(waitpid(pid, nullptr, WNOHANG));
if (wait_pid <= 0) {
kill(pid, SIGKILL);
}
ASSERT_NE(-1, wait_pid) << "Unknown failure in waitpid.";
ASSERT_EQ(0, wait_pid) << "malloc_disable did not prevent allocation calls.";
#else
GTEST_LOG_(INFO) << "Skipping, this is a bionic only test.";
#endif
}
|
