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
|
/*
* 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 <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include <android-base/unique_fd.h>
#include <memory>
#include <string>
#include <vector>
#include "Maps.h"
MapInfo* Maps::Find(uint64_t pc) {
if (maps_.empty()) {
return nullptr;
}
size_t first = 0;
size_t last = maps_.size();
while (first < last) {
size_t index = (first + last) / 2;
MapInfo* cur = &maps_[index];
if (pc >= cur->start && pc < cur->end) {
return cur;
} else if (pc < cur->start) {
last = index;
} else {
first = index + 1;
}
}
return nullptr;
}
bool Maps::ParseLine(const char* line, MapInfo* map_info) {
char permissions[5];
int name_pos;
// Linux /proc/<pid>/maps lines:
// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
if (sscanf(line, "%" SCNx64 "-%" SCNx64 " %4s %" SCNx64 " %*x:%*x %*d %n", &map_info->start,
&map_info->end, permissions, &map_info->offset, &name_pos) != 4) {
return false;
}
map_info->flags = PROT_NONE;
if (permissions[0] == 'r') {
map_info->flags |= PROT_READ;
}
if (permissions[1] == 'w') {
map_info->flags |= PROT_WRITE;
}
if (permissions[2] == 'x') {
map_info->flags |= PROT_EXEC;
}
map_info->name = &line[name_pos];
size_t length = map_info->name.length() - 1;
if (map_info->name[length] == '\n') {
map_info->name.erase(length);
}
// Mark a device map in /dev/and not in /dev/ashmem/ specially.
if (!map_info->name.empty() && map_info->name.substr(0, 5) == "/dev/" &&
map_info->name.substr(5, 7) != "ashmem/") {
map_info->flags |= MAPS_FLAGS_DEVICE_MAP;
}
return true;
}
bool Maps::Parse() {
std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(GetMapsFile().c_str(), "re"), fclose);
if (!fp) {
return false;
}
bool valid = true;
char* line = nullptr;
size_t line_len;
while (getline(&line, &line_len, fp.get()) > 0) {
MapInfo map_info;
if (!ParseLine(line, &map_info)) {
valid = false;
break;
}
maps_.push_back(map_info);
}
free(line);
return valid;
}
Maps::~Maps() {
for (auto& map : maps_) {
delete map.elf;
map.elf = nullptr;
}
}
bool BufferMaps::Parse() {
const char* start_of_line = buffer_;
do {
std::string line;
const char* end_of_line = strchr(start_of_line, '\n');
if (end_of_line == nullptr) {
line = start_of_line;
} else {
end_of_line++;
line = std::string(start_of_line, end_of_line - start_of_line);
}
MapInfo map_info;
if (!ParseLine(line.c_str(), &map_info)) {
return false;
}
maps_.push_back(map_info);
start_of_line = end_of_line;
} while (start_of_line != nullptr && *start_of_line != '\0');
return true;
}
const std::string RemoteMaps::GetMapsFile() const {
return "/proc/" + std::to_string(pid_) + "/maps";
}
bool OfflineMaps::Parse() {
// Format of maps information:
// <uint64_t> StartOffset
// <uint64_t> EndOffset
// <uint64_t> offset
// <uint16_t> flags
// <uint16_t> MapNameLength
// <VariableLengthValue> MapName
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_.c_str(), O_RDONLY)));
if (fd == -1) {
return false;
}
std::vector<char> name;
while (true) {
MapInfo map_info;
ssize_t bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.start, sizeof(map_info.start)));
if (bytes == 0) {
break;
}
if (bytes == -1 || bytes != sizeof(map_info.start)) {
return false;
}
bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.end, sizeof(map_info.end)));
if (bytes == -1 || bytes != sizeof(map_info.end)) {
return false;
}
bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.offset, sizeof(map_info.offset)));
if (bytes == -1 || bytes != sizeof(map_info.offset)) {
return false;
}
bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.flags, sizeof(map_info.flags)));
if (bytes == -1 || bytes != sizeof(map_info.flags)) {
return false;
}
uint16_t len;
bytes = TEMP_FAILURE_RETRY(read(fd, &len, sizeof(len)));
if (bytes == -1 || bytes != sizeof(len)) {
return false;
}
if (len > 0) {
name.resize(len);
bytes = TEMP_FAILURE_RETRY(read(fd, name.data(), len));
if (bytes == -1 || bytes != len) {
return false;
}
map_info.name = std::string(name.data(), len);
}
maps_.push_back(map_info);
}
return true;
}
|
