| /* |
| * Copyright (C) 2007 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 "roots.h" |
| |
| #include <ctype.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include <algorithm> |
| #include <string> |
| #include <vector> |
| |
| #include <android-base/logging.h> |
| #include <android-base/properties.h> |
| #include <android-base/stringprintf.h> |
| #include <android-base/unique_fd.h> |
| #include <cryptfs.h> |
| #include <ext4_utils/wipe.h> |
| #include <fs_mgr.h> |
| #include <fs_mgr/roots.h> |
| #include <fs_mgr_dm_linear.h> |
| |
| #include "otautil/mounts.h" |
| |
| static struct fstab* fstab = nullptr; |
| |
| extern struct selabel_handle* sehandle; |
| |
| void load_volume_table() { |
| fstab = fs_mgr_read_fstab_default(); |
| if (!fstab) { |
| LOG(ERROR) << "Failed to read default fstab"; |
| return; |
| } |
| |
| int ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk"); |
| if (ret == -1) { |
| LOG(ERROR) << "Failed to add /tmp entry to fstab"; |
| fs_mgr_free_fstab(fstab); |
| fstab = nullptr; |
| return; |
| } |
| |
| printf("recovery filesystem table\n"); |
| printf("=========================\n"); |
| for (int i = 0; i < fstab->num_entries; ++i) { |
| const Volume* v = &fstab->recs[i]; |
| printf(" %d %s %s %s %" PRId64 "\n", i, v->mount_point, v->fs_type, v->blk_device, v->length); |
| } |
| printf("\n"); |
| } |
| |
| Volume* volume_for_mount_point(const std::string& mount_point) { |
| return fs_mgr_get_entry_for_mount_point(fstab, mount_point); |
| } |
| |
| // Mount the volume specified by path at the given mount_point. |
| int ensure_path_mounted_at(const char* path, const char* mount_point) { |
| return android::fs_mgr::EnsurePathMounted(fstab, path, mount_point) ? 0 : -1; |
| } |
| |
| int ensure_path_mounted(const char* path) { |
| // Mount at the default mount point. |
| return android::fs_mgr::EnsurePathMounted(fstab, path) ? 0 : -1; |
| } |
| |
| int ensure_path_unmounted(const char* path) { |
| return android::fs_mgr::EnsurePathUnmounted(fstab, path) ? 0 : -1; |
| } |
| |
| static int exec_cmd(const std::vector<std::string>& args) { |
| CHECK_NE(static_cast<size_t>(0), args.size()); |
| |
| std::vector<char*> argv(args.size()); |
| std::transform(args.cbegin(), args.cend(), argv.begin(), |
| [](const std::string& arg) { return const_cast<char*>(arg.c_str()); }); |
| argv.push_back(nullptr); |
| |
| pid_t child; |
| if ((child = fork()) == 0) { |
| execv(argv[0], argv.data()); |
| _exit(EXIT_FAILURE); |
| } |
| |
| int status; |
| waitpid(child, &status, 0); |
| if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
| LOG(ERROR) << args[0] << " failed with status " << WEXITSTATUS(status); |
| } |
| return WEXITSTATUS(status); |
| } |
| |
| static int64_t get_file_size(int fd, uint64_t reserve_len) { |
| struct stat buf; |
| int ret = fstat(fd, &buf); |
| if (ret) return 0; |
| |
| int64_t computed_size; |
| if (S_ISREG(buf.st_mode)) { |
| computed_size = buf.st_size - reserve_len; |
| } else if (S_ISBLK(buf.st_mode)) { |
| uint64_t block_device_size = get_block_device_size(fd); |
| if (block_device_size < reserve_len || |
| block_device_size > std::numeric_limits<int64_t>::max()) { |
| computed_size = 0; |
| } else { |
| computed_size = block_device_size - reserve_len; |
| } |
| } else { |
| computed_size = 0; |
| } |
| |
| return computed_size; |
| } |
| |
| int format_volume(const char* volume, const char* directory) { |
| const Volume* v = android::fs_mgr::GetEntryForPath(fstab, volume); |
| if (v == nullptr) { |
| LOG(ERROR) << "unknown volume \"" << volume << "\""; |
| return -1; |
| } |
| if (strcmp(v->fs_type, "ramdisk") == 0) { |
| LOG(ERROR) << "can't format_volume \"" << volume << "\""; |
| return -1; |
| } |
| if (strcmp(v->mount_point, volume) != 0) { |
| LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume"; |
| return -1; |
| } |
| if (ensure_path_unmounted(volume) != 0) { |
| LOG(ERROR) << "format_volume: Failed to unmount \"" << v->mount_point << "\""; |
| return -1; |
| } |
| if (strcmp(v->fs_type, "ext4") != 0 && strcmp(v->fs_type, "f2fs") != 0) { |
| LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported"; |
| return -1; |
| } |
| |
| // If there's a key_loc that looks like a path, it should be a block device for storing encryption |
| // metadata. Wipe it too. |
| if (v->key_loc != nullptr && v->key_loc[0] == '/') { |
| LOG(INFO) << "Wiping " << v->key_loc; |
| int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644); |
| if (fd == -1) { |
| PLOG(ERROR) << "format_volume: Failed to open " << v->key_loc; |
| return -1; |
| } |
| wipe_block_device(fd, get_file_size(fd)); |
| close(fd); |
| } |
| |
| int64_t length = 0; |
| if (v->length > 0) { |
| length = v->length; |
| } else if (v->length < 0 || |
| (v->key_loc != nullptr && strcmp(v->key_loc, "footer") == 0)) { |
| android::base::unique_fd fd(open(v->blk_device, O_RDONLY)); |
| if (fd == -1) { |
| PLOG(ERROR) << "format_volume: failed to open " << v->blk_device; |
| return -1; |
| } |
| length = |
| get_file_size(fd.get(), v->length ? -v->length : CRYPT_FOOTER_OFFSET); |
| if (length <= 0) { |
| LOG(ERROR) << "get_file_size: invalid size " << length << " for " |
| << v->blk_device; |
| return -1; |
| } |
| } |
| |
| if (strcmp(v->fs_type, "ext4") == 0) { |
| static constexpr int kBlockSize = 4096; |
| std::vector<std::string> mke2fs_args = { |
| "/system/bin/mke2fs", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize), |
| }; |
| |
| int raid_stride = v->logical_blk_size / kBlockSize; |
| int raid_stripe_width = v->erase_blk_size / kBlockSize; |
| // stride should be the max of 8KB and logical block size |
| if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) { |
| raid_stride = 8192 / kBlockSize; |
| } |
| if (v->erase_blk_size != 0 && v->logical_blk_size != 0) { |
| mke2fs_args.push_back("-E"); |
| mke2fs_args.push_back( |
| android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride, raid_stripe_width)); |
| } |
| mke2fs_args.push_back(v->blk_device); |
| if (length != 0) { |
| mke2fs_args.push_back(std::to_string(length / kBlockSize)); |
| } |
| |
| int result = exec_cmd(mke2fs_args); |
| if (result == 0 && directory != nullptr) { |
| std::vector<std::string> e2fsdroid_args = { |
| "/system/bin/e2fsdroid", "-e", "-f", directory, "-a", volume, v->blk_device, |
| }; |
| result = exec_cmd(e2fsdroid_args); |
| } |
| |
| if (result != 0) { |
| PLOG(ERROR) << "format_volume: Failed to make ext4 on " << v->blk_device; |
| return -1; |
| } |
| return 0; |
| } |
| |
| // Has to be f2fs because we checked earlier. |
| static constexpr int kSectorSize = 4096; |
| std::string cmd("/sbin/mkfs.f2fs"); |
| // clang-format off |
| std::vector<std::string> make_f2fs_cmd = { |
| cmd, |
| "-g", "android", |
| v->blk_device, |
| }; |
| // clang-format on |
| if (length >= kSectorSize) { |
| make_f2fs_cmd.push_back(std::to_string(length / kSectorSize)); |
| } |
| |
| int result = exec_cmd(make_f2fs_cmd); |
| if (result == 0 && directory != nullptr) { |
| cmd = "/sbin/sload.f2fs"; |
| // clang-format off |
| std::vector<std::string> sload_f2fs_cmd = { |
| cmd, |
| "-f", directory, |
| "-t", volume, |
| v->blk_device, |
| }; |
| // clang-format on |
| result = exec_cmd(sload_f2fs_cmd); |
| } |
| if (result != 0) { |
| PLOG(ERROR) << "format_volume: Failed " << cmd << " on " << v->blk_device; |
| return -1; |
| } |
| return 0; |
| } |
| |
| int format_volume(const char* volume) { |
| return format_volume(volume, nullptr); |
| } |
| |
| int setup_install_mounts() { |
| if (fstab == nullptr) { |
| LOG(ERROR) << "can't set up install mounts: no fstab loaded"; |
| return -1; |
| } |
| for (int i = 0; i < fstab->num_entries; ++i) { |
| const Volume* v = fstab->recs + i; |
| |
| // We don't want to do anything with "/". |
| if (strcmp(v->mount_point, "/") == 0) { |
| continue; |
| } |
| |
| if (strcmp(v->mount_point, "/tmp") == 0 || strcmp(v->mount_point, "/cache") == 0) { |
| if (ensure_path_mounted(v->mount_point) != 0) { |
| LOG(ERROR) << "Failed to mount " << v->mount_point; |
| return -1; |
| } |
| } else { |
| if (ensure_path_unmounted(v->mount_point) != 0) { |
| LOG(ERROR) << "Failed to unmount " << v->mount_point; |
| return -1; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| bool logical_partitions_mapped() { |
| return android::fs_mgr::LogicalPartitionsMapped(); |
| } |
| |
| std::string get_system_root() { |
| return android::fs_mgr::GetSystemRoot(); |
| } |