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Diffstat (limited to '')
| -rw-r--r-- | install/wipe_data.cpp | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/install/wipe_data.cpp b/install/wipe_data.cpp new file mode 100644 index 000000000..765a8152b --- /dev/null +++ b/install/wipe_data.cpp @@ -0,0 +1,123 @@ +/* + * 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_data.h" + +#include <stdio.h> +#include <string.h> +#include <sys/stat.h> + +#include <functional> +#include <vector> + +#include <android-base/file.h> +#include <android-base/logging.h> +#include <android-base/stringprintf.h> + +#include "otautil/dirutil.h" +#include "otautil/logging.h" +#include "otautil/roots.h" +#include "recovery_ui/ui.h" + +constexpr const char* CACHE_ROOT = "/cache"; +constexpr const char* DATA_ROOT = "/data"; +constexpr const char* METADATA_ROOT = "/metadata"; + +static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) { + bool is_cache = (strcmp(volume, CACHE_ROOT) == 0); + bool is_data = (strcmp(volume, DATA_ROOT) == 0); + + ui->SetBackground(RecoveryUI::ERASING); + ui->SetProgressType(RecoveryUI::INDETERMINATE); + + std::vector<saved_log_file> log_files; + if (is_cache) { + // If we're reformatting /cache, we load any past logs (i.e. "/cache/recovery/last_*") and the + // current log ("/cache/recovery/log") into memory, so we can restore them after the reformat. + log_files = ReadLogFilesToMemory(); + } + + ui->Print("Formatting %s...\n", volume); + + ensure_path_unmounted(volume); + + int result; + if (is_data && convert_fbe) { + constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe"; + constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe"; + // Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not + // full disk encryption. + if (mkdir(CONVERT_FBE_DIR, 0700) != 0) { + PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR; + return false; + } + FILE* f = fopen(CONVERT_FBE_FILE, "wbe"); + if (!f) { + PLOG(ERROR) << "Failed to convert to file encryption"; + return false; + } + fclose(f); + result = format_volume(volume, CONVERT_FBE_DIR); + remove(CONVERT_FBE_FILE); + rmdir(CONVERT_FBE_DIR); + } else { + result = format_volume(volume); + } + + if (is_cache) { + RestoreLogFilesAfterFormat(log_files); + } + + return (result == 0); +} + +bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) { + bool has_cache = volume_for_mount_point("/cache") != nullptr; + if (!has_cache) { + ui->Print("No /cache partition found.\n"); + return false; + } + + if (confirm_func && !confirm_func()) { + return false; + } + + ui->Print("\n-- Wiping cache...\n"); + bool success = EraseVolume("/cache", ui, false); + ui->Print("Cache wipe %s.\n", success ? "complete" : "failed"); + return success; +} + +bool WipeData(Device* device, bool convert_fbe) { + RecoveryUI* ui = device->GetUI(); + ui->Print("\n-- Wiping data...\n"); + bool success = device->PreWipeData(); + if (success) { + success &= EraseVolume(DATA_ROOT, ui, convert_fbe); + bool has_cache = volume_for_mount_point("/cache") != nullptr; + if (has_cache) { + success &= EraseVolume(CACHE_ROOT, ui, false); + } + if (volume_for_mount_point(METADATA_ROOT) != nullptr) { + success &= EraseVolume(METADATA_ROOT, ui, false); + } + } + if (success) { + success &= device->PostWipeData(); + } + ui->Print("Data wipe %s.\n", success ? "complete" : "failed"); + return success; +}
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