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
|
/*
* 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 <string.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <unistd.h>
#include <memory>
#include <vector>
#include <android-base/file.h>
#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include "Elf.h"
#include "MapInfo.h"
#include "Memory.h"
class MapInfoCreateMemoryTest : public ::testing::Test {
protected:
static void SetUpTestCase() {
std::vector<uint8_t> buffer(1024);
memcpy(buffer.data(), ELFMAG, SELFMAG);
for (size_t i = SELFMAG; i < buffer.size(); i++) {
buffer[i] = i / 256 + 1;
}
ASSERT_TRUE(android::base::WriteFully(elf_.fd, buffer.data(), buffer.size()));
for (size_t i = 0; i < 0x100; i++) {
buffer[i] = i / 256 + 1;
}
memcpy(&buffer[0x100], ELFMAG, SELFMAG);
for (size_t i = 0x100 + SELFMAG; i < buffer.size(); i++) {
buffer[i] = i / 256 + 1;
}
ASSERT_TRUE(android::base::WriteFully(elf_at_100_.fd, buffer.data(), buffer.size()));
}
static TemporaryFile elf_;
static TemporaryFile elf_at_100_;
};
TemporaryFile MapInfoCreateMemoryTest::elf_;
TemporaryFile MapInfoCreateMemoryTest::elf_at_100_;
TEST_F(MapInfoCreateMemoryTest, end_le_start) {
MapInfo info{.start = 0x100, .end = 0x100, .offset = 0, .name = elf_.path};
std::unique_ptr<Memory> memory;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() == nullptr);
info.end = 0xff;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() == nullptr);
// Make sure this test is valid.
info.end = 0x101;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
}
// Verify that if the offset is non-zero but there is no elf at the offset,
// that the full file is used.
TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_full_file) {
MapInfo info{.start = 0x100, .end = 0x200, .offset = 0x100, .name = elf_.path};
std::unique_ptr<Memory> memory(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
ASSERT_EQ(0x100U, info.elf_offset);
// Read the entire file.
std::vector<uint8_t> buffer(1024);
ASSERT_TRUE(memory->Read(0, buffer.data(), 1024));
ASSERT_TRUE(memcmp(buffer.data(), ELFMAG, SELFMAG) == 0);
for (size_t i = SELFMAG; i < buffer.size(); i++) {
ASSERT_EQ(i / 256 + 1, buffer[i]) << "Failed at byte " << i;
}
ASSERT_FALSE(memory->Read(1024, buffer.data(), 1));
}
// Verify that if the offset is non-zero and there is an elf at that
// offset, that only part of the file is used.
TEST_F(MapInfoCreateMemoryTest, file_backed_non_zero_offset_partial_file) {
MapInfo info{.start = 0x100, .end = 0x200, .offset = 0x100, .name = elf_at_100_.path};
std::unique_ptr<Memory> memory(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
ASSERT_EQ(0U, info.elf_offset);
// Read the valid part of the file.
std::vector<uint8_t> buffer(0x100);
ASSERT_TRUE(memory->Read(0, buffer.data(), 0x100));
ASSERT_TRUE(memcmp(buffer.data(), ELFMAG, SELFMAG) == 0);
for (size_t i = SELFMAG; i < buffer.size(); i++) {
ASSERT_EQ(2, buffer[i]) << "Failed at byte " << i;
}
ASSERT_FALSE(memory->Read(0x100, buffer.data(), 1));
}
// Verify that device file names will never result in Memory object creation.
TEST_F(MapInfoCreateMemoryTest, check_device_maps) {
// Set up some memory so that a valid local memory object would
// be returned if the file mapping fails, but the device check is incorrect.
std::vector<uint8_t> buffer(1024);
MapInfo info;
info.start = reinterpret_cast<uint64_t>(buffer.data());
info.end = info.start + buffer.size();
info.offset = 0;
std::unique_ptr<Memory> memory;
info.flags = 0x8000;
info.name = "/dev/something";
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() == nullptr);
}
TEST_F(MapInfoCreateMemoryTest, local_memory) {
// Set up some memory for a valid local memory object.
std::vector<uint8_t> buffer(1024);
for (size_t i = 0; i < buffer.size(); i++) {
buffer[i] = i % 256;
}
MapInfo info;
info.start = reinterpret_cast<uint64_t>(buffer.data());
info.end = info.start + buffer.size();
info.offset = 0;
std::unique_ptr<Memory> memory;
memory.reset(info.CreateMemory(getpid()));
ASSERT_TRUE(memory.get() != nullptr);
std::vector<uint8_t> read_buffer(1024);
ASSERT_TRUE(memory->Read(0, read_buffer.data(), read_buffer.size()));
for (size_t i = 0; i < read_buffer.size(); i++) {
ASSERT_EQ(i % 256, read_buffer[i]) << "Failed at byte " << i;
}
ASSERT_FALSE(memory->Read(read_buffer.size(), read_buffer.data(), 1));
}
TEST_F(MapInfoCreateMemoryTest, remote_memory) {
std::vector<uint8_t> buffer(1024);
memset(buffer.data(), 0xa, buffer.size());
pid_t pid;
if ((pid = fork()) == 0) {
while (true)
;
exit(1);
}
ASSERT_LT(0, pid);
ASSERT_TRUE(ptrace(PTRACE_ATTACH, pid, 0, 0) != -1);
uint64_t iterations = 0;
siginfo_t si;
while (TEMP_FAILURE_RETRY(ptrace(PTRACE_GETSIGINFO, pid, 0, &si)) < 0 && errno == ESRCH) {
usleep(30);
iterations++;
ASSERT_LT(iterations, 500000000ULL);
}
MapInfo info;
info.start = reinterpret_cast<uint64_t>(buffer.data());
info.end = info.start + buffer.size();
info.offset = 0;
std::unique_ptr<Memory> memory;
memory.reset(info.CreateMemory(pid));
ASSERT_TRUE(memory.get() != nullptr);
// Set the local memory to a different value to guarantee we are reading
// from the remote process.
memset(buffer.data(), 0x1, buffer.size());
std::vector<uint8_t> read_buffer(1024);
ASSERT_TRUE(memory->Read(0, read_buffer.data(), read_buffer.size()));
for (size_t i = 0; i < read_buffer.size(); i++) {
ASSERT_EQ(0xaU, read_buffer[i]) << "Failed at byte " << i;
}
ASSERT_TRUE(ptrace(PTRACE_DETACH, pid, 0, 0) == 0);
kill(pid, SIGKILL);
ASSERT_EQ(pid, wait(nullptr));
}
|
