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
|
/*
* Copyright (C) 2019 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 "install/wipe_device.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <ziparchive/zip_archive.h>
#include "bootloader_message/bootloader_message.h"
#include "install/install.h"
#include "otautil/package.h"
#include "recovery_ui/device.h"
#include "recovery_ui/ui.h"
std::vector<std::string> GetWipePartitionList(Package* wipe_package) {
ZipArchiveHandle zip = wipe_package->GetZipArchiveHandle();
if (!zip) {
LOG(ERROR) << "Failed to get ZipArchiveHandle";
return {};
}
constexpr char RECOVERY_WIPE_ENTRY_NAME[] = "recovery.wipe";
std::string partition_list_content;
ZipEntry64 entry;
if (FindEntry(zip, RECOVERY_WIPE_ENTRY_NAME, &entry) == 0) {
auto length = entry.uncompressed_length;
if (length > std::numeric_limits<size_t>::max()) {
LOG(ERROR) << "Failed to extract " << RECOVERY_WIPE_ENTRY_NAME
<< " because's uncompressed size exceeds size of address space. " << length;
return {};
}
partition_list_content = std::string(length, '\0');
if (auto err = ExtractToMemory(
zip, &entry, reinterpret_cast<uint8_t*>(partition_list_content.data()), length);
err != 0) {
LOG(ERROR) << "Failed to extract " << RECOVERY_WIPE_ENTRY_NAME << ": "
<< ErrorCodeString(err);
return {};
}
} else {
LOG(INFO) << "Failed to find " << RECOVERY_WIPE_ENTRY_NAME
<< ", falling back to use the partition list on device.";
constexpr char RECOVERY_WIPE_ON_DEVICE[] = "/etc/recovery.wipe";
if (!android::base::ReadFileToString(RECOVERY_WIPE_ON_DEVICE, &partition_list_content)) {
PLOG(ERROR) << "failed to read \"" << RECOVERY_WIPE_ON_DEVICE << "\"";
return {};
}
}
std::vector<std::string> result;
auto lines = android::base::Split(partition_list_content, "\n");
for (const auto& line : lines) {
auto partition = android::base::Trim(line);
// Ignore '#' comment or empty lines.
if (android::base::StartsWith(partition, "#") || partition.empty()) {
continue;
}
result.push_back(line);
}
return result;
}
// Secure-wipes a given partition. It uses BLKSECDISCARD, if supported. Otherwise, it goes with
// BLKDISCARD (if device supports BLKDISCARDZEROES) or BLKZEROOUT.
static bool SecureWipePartition(const std::string& partition) {
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(partition.c_str(), O_WRONLY)));
if (fd == -1) {
PLOG(ERROR) << "Failed to open \"" << partition << "\"";
return false;
}
uint64_t range[2] = { 0, 0 };
if (ioctl(fd, BLKGETSIZE64, &range[1]) == -1 || range[1] == 0) {
PLOG(ERROR) << "Failed to get partition size";
return false;
}
LOG(INFO) << "Secure-wiping \"" << partition << "\" from " << range[0] << " to " << range[1];
LOG(INFO) << " Trying BLKSECDISCARD...";
if (ioctl(fd, BLKSECDISCARD, &range) == -1) {
PLOG(WARNING) << " Failed";
// Use BLKDISCARD if it zeroes out blocks, otherwise use BLKZEROOUT.
unsigned int zeroes;
if (ioctl(fd, BLKDISCARDZEROES, &zeroes) == 0 && zeroes != 0) {
LOG(INFO) << " Trying BLKDISCARD...";
if (ioctl(fd, BLKDISCARD, &range) == -1) {
PLOG(ERROR) << " Failed";
return false;
}
} else {
LOG(INFO) << " Trying BLKZEROOUT...";
if (ioctl(fd, BLKZEROOUT, &range) == -1) {
PLOG(ERROR) << " Failed";
return false;
}
}
}
LOG(INFO) << " Done";
return true;
}
static std::unique_ptr<Package> ReadWipePackage(size_t wipe_package_size) {
if (wipe_package_size == 0) {
LOG(ERROR) << "wipe_package_size is zero";
return nullptr;
}
std::string wipe_package;
if (std::string err_str; !read_wipe_package(&wipe_package, wipe_package_size, &err_str)) {
PLOG(ERROR) << "Failed to read wipe package" << err_str;
return nullptr;
}
return Package::CreateMemoryPackage(
std::vector<uint8_t>(wipe_package.begin(), wipe_package.end()), nullptr);
}
// Checks if the wipe package matches expectation. If the check passes, reads the list of
// partitions to wipe from the package. Checks include
// 1. verify the package.
// 2. check metadata (ota-type, pre-device and serial number if having one).
static bool CheckWipePackage(Package* wipe_package, RecoveryUI* ui) {
if (!verify_package(wipe_package, ui)) {
LOG(ERROR) << "Failed to verify package";
return false;
}
ZipArchiveHandle zip = wipe_package->GetZipArchiveHandle();
if (!zip) {
LOG(ERROR) << "Failed to get ZipArchiveHandle";
return false;
}
std::map<std::string, std::string> metadata;
if (!ReadMetadataFromPackage(zip, &metadata)) {
LOG(ERROR) << "Failed to parse metadata in the zip file";
return false;
}
return CheckPackageMetadata(metadata, OtaType::BRICK);
}
bool WipeAbDevice(Device* device, size_t wipe_package_size) {
auto ui = device->GetUI();
ui->SetBackground(RecoveryUI::ERASING);
ui->SetProgressType(RecoveryUI::INDETERMINATE);
auto wipe_package = ReadWipePackage(wipe_package_size);
if (!wipe_package) {
LOG(ERROR) << "Failed to open wipe package";
return false;
}
if (!CheckWipePackage(wipe_package.get(), ui)) {
LOG(ERROR) << "Failed to verify wipe package";
return false;
}
auto partition_list = GetWipePartitionList(wipe_package.get());
if (partition_list.empty()) {
LOG(ERROR) << "Empty wipe ab partition list";
return false;
}
for (const auto& partition : partition_list) {
// Proceed anyway even if it fails to wipe some partition.
SecureWipePartition(partition);
}
return true;
}
|
