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The Android Open Source Projectc24a8e62009-03-03 19:28:42 -08001/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
Elliott Hughes63a31922016-06-09 17:41:22 -070017#include "roots.h"
18
Tao Baobb10e582017-07-22 16:30:34 -070019#include <ctype.h>
20#include <fcntl.h>
Tom Cherry45e505a2018-11-29 13:33:07 -080021#include <inttypes.h>
Abhishek Arpure4fec8e92017-08-24 15:27:16 +053022#include <stdint.h>
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080023#include <stdlib.h>
Tao Baoad774b22017-09-29 10:39:08 -070024#include <string.h>
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080025#include <sys/mount.h>
26#include <sys/stat.h>
27#include <sys/types.h>
JP Abgrall37aedb32014-06-16 19:07:39 -070028#include <sys/wait.h>
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080029#include <unistd.h>
30
Yifan Hongd81b8e32018-12-17 14:29:06 -080031#include <iostream>
Tao Bao3c00fac2017-07-22 16:46:54 -070032#include <string>
33#include <vector>
34
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -070035#include <android-base/logging.h>
Jin Qianded2dac2017-04-21 14:36:12 -070036#include <android-base/properties.h>
37#include <android-base/stringprintf.h>
Jin Qianf3ccad52017-07-24 10:34:35 -070038#include <android-base/unique_fd.h>
Tao Baobb10e582017-07-22 16:30:34 -070039#include <cryptfs.h>
Tao Baode40ba52016-10-05 23:17:01 -070040#include <ext4_utils/wipe.h>
Ken Sumrallf35d1ce2013-02-13 12:59:35 -080041#include <fs_mgr.h>
Yifan Hong0f339e22018-12-03 13:44:01 -080042#include <fs_mgr/roots.h>
David Anderson2b2f4232018-10-29 18:48:56 -070043#include <fs_mgr_dm_linear.h>
Tao Baode40ba52016-10-05 23:17:01 -070044
Tao Bao9a319f02018-01-04 13:19:11 -080045#include "otautil/mounts.h"
Tao Bao3d69f0d2018-12-20 09:44:06 -080046#include "otautil/sysutil.h"
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080047
Yifan Hongd81b8e32018-12-17 14:29:06 -080048static Fstab fstab;
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080049
Tao Baobb10e582017-07-22 16:30:34 -070050extern struct selabel_handle* sehandle;
Stephen Smalley779701d2012-02-09 14:13:23 -050051
Tao Baobb10e582017-07-22 16:30:34 -070052void load_volume_table() {
Yifan Hongd81b8e32018-12-17 14:29:06 -080053 if (!ReadDefaultFstab(&fstab)) {
Tao Baobb10e582017-07-22 16:30:34 -070054 LOG(ERROR) << "Failed to read default fstab";
55 return;
56 }
Doug Zongker2810ced2011-02-17 15:55:21 -080057
Yifan Hongd81b8e32018-12-17 14:29:06 -080058 fstab.emplace_back(FstabEntry{
59 .mount_point = "/tmp", .fs_type = "ramdisk", .blk_device = "ramdisk", .length = 0 });
Doug Zongkerd4208f92010-09-20 12:16:13 -070060
Yifan Hongd81b8e32018-12-17 14:29:06 -080061 std::cout << "recovery filesystem table" << std::endl << "=========================" << std::endl;
62 for (size_t i = 0; i < fstab.size(); ++i) {
63 const auto& entry = fstab[i];
64 std::cout << " " << i << " " << entry.mount_point << " "
65 << " " << entry.fs_type << " " << entry.blk_device << " " << entry.length
66 << std::endl;
Tao Baobb10e582017-07-22 16:30:34 -070067 }
Yifan Hongd81b8e32018-12-17 14:29:06 -080068 std::cout << std::endl;
Doug Zongkerd4208f92010-09-20 12:16:13 -070069}
70
Tao Bao3e18f2b2017-09-29 17:11:13 -070071Volume* volume_for_mount_point(const std::string& mount_point) {
Yifan Hongd81b8e32018-12-17 14:29:06 -080072 auto it = std::find_if(fstab.begin(), fstab.end(), [&mount_point](const auto& entry) {
73 return entry.mount_point == mount_point;
74 });
75 return it == fstab.end() ? nullptr : &*it;
Tao Bao3e18f2b2017-09-29 17:11:13 -070076}
77
Tao Baoabb8f772015-07-30 14:43:27 -070078// Mount the volume specified by path at the given mount_point.
Yifan Hongd81b8e32018-12-17 14:29:06 -080079int ensure_path_mounted_at(const std::string& path, const std::string& mount_point) {
80 return android::fs_mgr::EnsurePathMounted(&fstab, path, mount_point) ? 0 : -1;
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -080081}
82
Yifan Hongd81b8e32018-12-17 14:29:06 -080083int ensure_path_mounted(const std::string& path) {
Tao Baobb10e582017-07-22 16:30:34 -070084 // Mount at the default mount point.
Yifan Hongd81b8e32018-12-17 14:29:06 -080085 return android::fs_mgr::EnsurePathMounted(&fstab, path) ? 0 : -1;
Tao Baoabb8f772015-07-30 14:43:27 -070086}
87
Yifan Hongd81b8e32018-12-17 14:29:06 -080088int ensure_path_unmounted(const std::string& path) {
89 return android::fs_mgr::EnsurePathUnmounted(&fstab, path) ? 0 : -1;
Doug Zongkerd4208f92010-09-20 12:16:13 -070090}
91
Tao Bao3c00fac2017-07-22 16:46:54 -070092static int exec_cmd(const std::vector<std::string>& args) {
Tao Bao3d69f0d2018-12-20 09:44:06 -080093 CHECK(!args.empty());
94 auto argv = StringVectorToNullTerminatedArray(args);
Tao Bao3c00fac2017-07-22 16:46:54 -070095
96 pid_t child;
George Burgess IV1cfb3612018-02-17 17:48:45 -080097 if ((child = fork()) == 0) {
Tao Bao3c00fac2017-07-22 16:46:54 -070098 execv(argv[0], argv.data());
99 _exit(EXIT_FAILURE);
100 }
101
102 int status;
103 waitpid(child, &status, 0);
104 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
105 LOG(ERROR) << args[0] << " failed with status " << WEXITSTATUS(status);
106 }
107 return WEXITSTATUS(status);
JP Abgrall37aedb32014-06-16 19:07:39 -0700108}
109
Abhishek Arpure4fec8e92017-08-24 15:27:16 +0530110static int64_t get_file_size(int fd, uint64_t reserve_len) {
Jin Qianf3ccad52017-07-24 10:34:35 -0700111 struct stat buf;
112 int ret = fstat(fd, &buf);
113 if (ret) return 0;
114
Abhishek Arpure4fec8e92017-08-24 15:27:16 +0530115 int64_t computed_size;
Jin Qianf3ccad52017-07-24 10:34:35 -0700116 if (S_ISREG(buf.st_mode)) {
117 computed_size = buf.st_size - reserve_len;
118 } else if (S_ISBLK(buf.st_mode)) {
Abhishek Arpure4fec8e92017-08-24 15:27:16 +0530119 uint64_t block_device_size = get_block_device_size(fd);
120 if (block_device_size < reserve_len ||
121 block_device_size > std::numeric_limits<int64_t>::max()) {
122 computed_size = 0;
123 } else {
124 computed_size = block_device_size - reserve_len;
125 }
Jin Qianf3ccad52017-07-24 10:34:35 -0700126 } else {
127 computed_size = 0;
128 }
129
130 return computed_size;
131}
132
Yifan Hongd81b8e32018-12-17 14:29:06 -0800133int format_volume(const std::string& volume, const std::string& directory) {
134 const FstabEntry* v = android::fs_mgr::GetEntryForPath(&fstab, volume);
Tao Bao3c00fac2017-07-22 16:46:54 -0700135 if (v == nullptr) {
136 LOG(ERROR) << "unknown volume \"" << volume << "\"";
137 return -1;
138 }
Yifan Hongd81b8e32018-12-17 14:29:06 -0800139 if (v->fs_type == "ramdisk") {
Tao Bao3c00fac2017-07-22 16:46:54 -0700140 LOG(ERROR) << "can't format_volume \"" << volume << "\"";
141 return -1;
142 }
Yifan Hongd81b8e32018-12-17 14:29:06 -0800143 if (v->mount_point != volume) {
Tao Bao3c00fac2017-07-22 16:46:54 -0700144 LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume";
145 return -1;
146 }
147 if (ensure_path_unmounted(volume) != 0) {
148 LOG(ERROR) << "format_volume: Failed to unmount \"" << v->mount_point << "\"";
149 return -1;
150 }
Yifan Hongd81b8e32018-12-17 14:29:06 -0800151 if (v->fs_type != "ext4" && v->fs_type != "f2fs") {
Tianjie Xu7b0ad9c2016-08-05 18:00:04 -0700152 LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported";
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800153 return -1;
Tao Bao3c00fac2017-07-22 16:46:54 -0700154 }
155
156 // If there's a key_loc that looks like a path, it should be a block device for storing encryption
157 // metadata. Wipe it too.
Yifan Hongd81b8e32018-12-17 14:29:06 -0800158 if (!v->key_loc.empty() && v->key_loc[0] == '/') {
Tao Bao3c00fac2017-07-22 16:46:54 -0700159 LOG(INFO) << "Wiping " << v->key_loc;
Yifan Hongd81b8e32018-12-17 14:29:06 -0800160 int fd = open(v->key_loc.c_str(), O_WRONLY | O_CREAT, 0644);
Tao Bao3c00fac2017-07-22 16:46:54 -0700161 if (fd == -1) {
162 PLOG(ERROR) << "format_volume: Failed to open " << v->key_loc;
163 return -1;
164 }
165 wipe_block_device(fd, get_file_size(fd));
166 close(fd);
167 }
168
Abhishek Arpure4fec8e92017-08-24 15:27:16 +0530169 int64_t length = 0;
Jin Qiancc100082017-11-17 23:53:22 -0800170 if (v->length > 0) {
Tao Bao3c00fac2017-07-22 16:46:54 -0700171 length = v->length;
Yifan Hongd81b8e32018-12-17 14:29:06 -0800172 } else if (v->length < 0 || v->key_loc == "footer") {
173 android::base::unique_fd fd(open(v->blk_device.c_str(), O_RDONLY));
Tao Bao3c00fac2017-07-22 16:46:54 -0700174 if (fd == -1) {
Abhishek Arpure4fec8e92017-08-24 15:27:16 +0530175 PLOG(ERROR) << "format_volume: failed to open " << v->blk_device;
Tao Bao3c00fac2017-07-22 16:46:54 -0700176 return -1;
177 }
Jin Qiancc100082017-11-17 23:53:22 -0800178 length =
179 get_file_size(fd.get(), v->length ? -v->length : CRYPT_FOOTER_OFFSET);
Tao Bao3c00fac2017-07-22 16:46:54 -0700180 if (length <= 0) {
Jin Qiancc100082017-11-17 23:53:22 -0800181 LOG(ERROR) << "get_file_size: invalid size " << length << " for "
182 << v->blk_device;
Tao Bao3c00fac2017-07-22 16:46:54 -0700183 return -1;
184 }
185 }
186
Yifan Hongd81b8e32018-12-17 14:29:06 -0800187 if (v->fs_type == "ext4") {
Tao Bao3c00fac2017-07-22 16:46:54 -0700188 static constexpr int kBlockSize = 4096;
189 std::vector<std::string> mke2fs_args = {
Jiyong Park69364fe2018-06-20 14:18:18 +0900190 "/system/bin/mke2fs", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize),
Tao Bao3c00fac2017-07-22 16:46:54 -0700191 };
192
193 int raid_stride = v->logical_blk_size / kBlockSize;
194 int raid_stripe_width = v->erase_blk_size / kBlockSize;
195 // stride should be the max of 8KB and logical block size
196 if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) {
197 raid_stride = 8192 / kBlockSize;
198 }
199 if (v->erase_blk_size != 0 && v->logical_blk_size != 0) {
200 mke2fs_args.push_back("-E");
201 mke2fs_args.push_back(
202 android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride, raid_stripe_width));
203 }
204 mke2fs_args.push_back(v->blk_device);
205 if (length != 0) {
206 mke2fs_args.push_back(std::to_string(length / kBlockSize));
207 }
208
209 int result = exec_cmd(mke2fs_args);
Yifan Hongd81b8e32018-12-17 14:29:06 -0800210 if (result == 0 && !directory.empty()) {
Tao Bao3c00fac2017-07-22 16:46:54 -0700211 std::vector<std::string> e2fsdroid_args = {
Jiyong Park69364fe2018-06-20 14:18:18 +0900212 "/system/bin/e2fsdroid", "-e", "-f", directory, "-a", volume, v->blk_device,
Tao Bao3c00fac2017-07-22 16:46:54 -0700213 };
214 result = exec_cmd(e2fsdroid_args);
215 }
216
217 if (result != 0) {
218 PLOG(ERROR) << "format_volume: Failed to make ext4 on " << v->blk_device;
219 return -1;
220 }
221 return 0;
222 }
223
224 // Has to be f2fs because we checked earlier.
Jaegeuk Kim43582622018-04-02 13:37:35 -0700225 static constexpr int kSectorSize = 4096;
Jaegeuk Kim43582622018-04-02 13:37:35 -0700226 std::vector<std::string> make_f2fs_cmd = {
Tao Baoc674dfb2018-12-20 14:25:15 -0800227 "/system/bin/make_f2fs",
228 "-g",
229 "android",
Jaegeuk Kim43582622018-04-02 13:37:35 -0700230 v->blk_device,
231 };
Jaegeuk Kim43582622018-04-02 13:37:35 -0700232 if (length >= kSectorSize) {
233 make_f2fs_cmd.push_back(std::to_string(length / kSectorSize));
Tao Bao3c00fac2017-07-22 16:46:54 -0700234 }
235
Tao Baoc674dfb2018-12-20 14:25:15 -0800236 if (exec_cmd(make_f2fs_cmd) != 0) {
237 PLOG(ERROR) << "format_volume: Failed to make_f2fs on " << v->blk_device;
Tao Bao3c00fac2017-07-22 16:46:54 -0700238 return -1;
239 }
Tao Baoc674dfb2018-12-20 14:25:15 -0800240 if (!directory.empty()) {
241 std::vector<std::string> sload_f2fs_cmd = {
242 "/system/bin/sload_f2fs", "-f", directory, "-t", volume, v->blk_device,
243 };
244 if (exec_cmd(sload_f2fs_cmd) != 0) {
245 PLOG(ERROR) << "format_volume: Failed to sload_f2fs on " << v->blk_device;
246 return -1;
247 }
248 }
Tao Bao3c00fac2017-07-22 16:46:54 -0700249 return 0;
The Android Open Source Projectc24a8e62009-03-03 19:28:42 -0800250}
Doug Zongker239ac6a2013-08-20 16:03:25 -0700251
Yifan Hongd81b8e32018-12-17 14:29:06 -0800252int format_volume(const std::string& volume) {
253 return format_volume(volume, "");
Paul Lawrenced0db3372015-11-05 13:38:40 -0800254}
255
Doug Zongker239ac6a2013-08-20 16:03:25 -0700256int setup_install_mounts() {
Yifan Hongd81b8e32018-12-17 14:29:06 -0800257 if (fstab.empty()) {
Tao Bao57130c42017-05-10 12:11:21 -0700258 LOG(ERROR) << "can't set up install mounts: no fstab loaded";
259 return -1;
260 }
Yifan Hongd81b8e32018-12-17 14:29:06 -0800261 for (const FstabEntry& entry : fstab) {
Tao Bao57130c42017-05-10 12:11:21 -0700262 // We don't want to do anything with "/".
Yifan Hongd81b8e32018-12-17 14:29:06 -0800263 if (entry.mount_point == "/") {
Tao Bao57130c42017-05-10 12:11:21 -0700264 continue;
265 }
266
Yifan Hongd81b8e32018-12-17 14:29:06 -0800267 if (entry.mount_point == "/tmp" || entry.mount_point == "/cache") {
268 if (ensure_path_mounted(entry.mount_point) != 0) {
269 LOG(ERROR) << "Failed to mount " << entry.mount_point;
Doug Zongker239ac6a2013-08-20 16:03:25 -0700270 return -1;
Tao Bao57130c42017-05-10 12:11:21 -0700271 }
272 } else {
Yifan Hongd81b8e32018-12-17 14:29:06 -0800273 if (ensure_path_unmounted(entry.mount_point) != 0) {
274 LOG(ERROR) << "Failed to unmount " << entry.mount_point;
Tao Bao57130c42017-05-10 12:11:21 -0700275 return -1;
276 }
Doug Zongker239ac6a2013-08-20 16:03:25 -0700277 }
Tao Bao57130c42017-05-10 12:11:21 -0700278 }
279 return 0;
Doug Zongker239ac6a2013-08-20 16:03:25 -0700280}
David Anderson2b2f4232018-10-29 18:48:56 -0700281
282bool logical_partitions_mapped() {
Yifan Hong0f339e22018-12-03 13:44:01 -0800283 return android::fs_mgr::LogicalPartitionsMapped();
David Anderson2b2f4232018-10-29 18:48:56 -0700284}
Yifan Hong49327802018-11-26 14:59:09 -0800285
286std::string get_system_root() {
Yifan Hong0f339e22018-12-03 13:44:01 -0800287 return android::fs_mgr::GetSystemRoot();
Yifan Hong49327802018-11-26 14:59:09 -0800288}