| /* |
| * 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 "recovery_utils/roots.h" |
| |
| #include <fcntl.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include <iostream> |
| #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 "otautil/sysutil.h" |
| |
| using android::fs_mgr::Fstab; |
| using android::fs_mgr::FstabEntry; |
| using android::fs_mgr::ReadDefaultFstab; |
| |
| static Fstab fstab; |
| |
| constexpr const char* CACHE_ROOT = "/cache"; |
| |
| void load_volume_table() { |
| if (!ReadDefaultFstab(&fstab)) { |
| LOG(ERROR) << "Failed to read default fstab"; |
| return; |
| } |
| |
| fstab.emplace_back(FstabEntry{ |
| .blk_device = "ramdisk", |
| .mount_point = "/tmp", |
| .fs_type = "ramdisk", |
| .length = 0, |
| }); |
| |
| std::cout << "recovery filesystem table" << std::endl << "=========================" << std::endl; |
| for (size_t i = 0; i < fstab.size(); ++i) { |
| const auto& entry = fstab[i]; |
| std::cout << " " << i << " " << entry.mount_point << " " |
| << " " << entry.fs_type << " " << entry.blk_device << " " << entry.length |
| << std::endl; |
| } |
| std::cout << std::endl; |
| } |
| |
| Volume* volume_for_mount_point(const std::string& mount_point) { |
| return android::fs_mgr::GetEntryForMountPoint(&fstab, mount_point); |
| } |
| |
| // Mount the volume specified by path at the given mount_point. |
| int ensure_path_mounted_at(const std::string& path, const std::string& mount_point) { |
| return android::fs_mgr::EnsurePathMounted(&fstab, path, mount_point) ? 0 : -1; |
| } |
| |
| int ensure_path_mounted(const std::string& path) { |
| // Mount at the default mount point. |
| return android::fs_mgr::EnsurePathMounted(&fstab, path) ? 0 : -1; |
| } |
| |
| int ensure_path_unmounted(const std::string& path) { |
| return android::fs_mgr::EnsurePathUnmounted(&fstab, path) ? 0 : -1; |
| } |
| |
| static int exec_cmd(const std::vector<std::string>& args) { |
| CHECK(!args.empty()); |
| auto argv = StringVectorToNullTerminatedArray(args); |
| |
| 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 std::string& volume, const std::string& directory) { |
| const FstabEntry* v = android::fs_mgr::GetEntryForPath(&fstab, volume); |
| if (v == nullptr) { |
| LOG(ERROR) << "unknown volume \"" << volume << "\""; |
| return -1; |
| } |
| if (v->fs_type == "ramdisk") { |
| LOG(ERROR) << "can't format_volume \"" << volume << "\""; |
| return -1; |
| } |
| if (v->mount_point != volume) { |
| 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 (v->fs_type != "ext4" && v->fs_type != "f2fs") { |
| LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported"; |
| return -1; |
| } |
| |
| bool needs_casefold = false; |
| bool needs_projid = false; |
| |
| if (volume == "/data") { |
| needs_casefold = android::base::GetBoolProperty("ro.emulated_storage.casefold", false); |
| needs_projid = android::base::GetBoolProperty("ro.emulated_storage.projid", false); |
| } |
| |
| // 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.empty() && v->key_loc[0] == '/') { |
| LOG(INFO) << "Wiping " << v->key_loc; |
| int fd = open(v->key_loc.c_str(), 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 == "footer") { |
| android::base::unique_fd fd(open(v->blk_device.c_str(), 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 (v->fs_type == "ext4") { |
| static constexpr int kBlockSize = 4096; |
| std::vector<std::string> mke2fs_args = { |
| "/system/bin/mke2fs", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize), |
| }; |
| |
| // Project ID's require wider inodes. The Quotas themselves are enabled by tune2fs on boot. |
| if (needs_projid) { |
| mke2fs_args.push_back("-I"); |
| mke2fs_args.push_back("512"); |
| } |
| |
| if (v->fs_mgr_flags.ext_meta_csum) { |
| mke2fs_args.push_back("-O"); |
| mke2fs_args.push_back("metadata_csum"); |
| mke2fs_args.push_back("-O"); |
| mke2fs_args.push_back("64bit"); |
| mke2fs_args.push_back("-O"); |
| mke2fs_args.push_back("extent"); |
| } |
| |
| 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.empty()) { |
| 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::vector<std::string> make_f2fs_cmd = { |
| "/system/bin/make_f2fs", |
| "-g", |
| "android", |
| }; |
| if (needs_projid) { |
| make_f2fs_cmd.push_back("-O"); |
| make_f2fs_cmd.push_back("project_quota,extra_attr"); |
| } |
| if (needs_casefold) { |
| make_f2fs_cmd.push_back("-O"); |
| make_f2fs_cmd.push_back("casefold"); |
| make_f2fs_cmd.push_back("-C"); |
| make_f2fs_cmd.push_back("utf8"); |
| } |
| if (v->fs_mgr_flags.fs_compress) { |
| make_f2fs_cmd.push_back("-O"); |
| make_f2fs_cmd.push_back("compression"); |
| make_f2fs_cmd.push_back("-O"); |
| make_f2fs_cmd.push_back("extra_attr"); |
| } |
| make_f2fs_cmd.push_back(v->blk_device); |
| if (length >= kSectorSize) { |
| make_f2fs_cmd.push_back(std::to_string(length / kSectorSize)); |
| } |
| |
| if (exec_cmd(make_f2fs_cmd) != 0) { |
| PLOG(ERROR) << "format_volume: Failed to make_f2fs on " << v->blk_device; |
| return -1; |
| } |
| if (!directory.empty()) { |
| std::vector<std::string> sload_f2fs_cmd = { |
| "/system/bin/sload_f2fs", "-f", directory, "-t", volume, v->blk_device, |
| }; |
| if (exec_cmd(sload_f2fs_cmd) != 0) { |
| PLOG(ERROR) << "format_volume: Failed to sload_f2fs on " << v->blk_device; |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| int format_volume(const std::string& volume) { |
| return format_volume(volume, ""); |
| } |
| |
| int setup_install_mounts() { |
| if (fstab.empty()) { |
| LOG(ERROR) << "can't set up install mounts: no fstab loaded"; |
| return -1; |
| } |
| for (const FstabEntry& entry : fstab) { |
| // We don't want to do anything with "/". |
| if (entry.mount_point == "/") { |
| continue; |
| } |
| |
| if (entry.mount_point == "/tmp" || entry.mount_point == "/cache") { |
| if (ensure_path_mounted(entry.mount_point) != 0) { |
| LOG(ERROR) << "Failed to mount " << entry.mount_point; |
| return -1; |
| } |
| } else { |
| if (ensure_path_unmounted(entry.mount_point) != 0) { |
| LOG(ERROR) << "Failed to unmount " << entry.mount_point; |
| return -1; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| bool HasCache() { |
| CHECK(!fstab.empty()); |
| static bool has_cache = volume_for_mount_point(CACHE_ROOT) != nullptr; |
| return has_cache; |
| } |