89d2d050a0
After an OTA is applied, a wipe in recovery may overwrite components of dynamic partitions living in userdata. If the OTA has not yet begun merging, we mark the current slot unbootable. If the OTA has begun merging, we wait for the merge to complete. This logic is encapsulated in libsnapshot. Bug: 139156011 Test: manual test Change-Id: Id6544a1b8583afcbba11559d46214ec2e68ffa40
130 lines
3.9 KiB
C++
130 lines
3.9 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "install/wipe_data.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <functional>
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#include <vector>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include "install/snapshot_utils.h"
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#include "otautil/dirutil.h"
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#include "recovery_ui/ui.h"
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#include "recovery_utils/logging.h"
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#include "recovery_utils/roots.h"
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constexpr const char* CACHE_ROOT = "/cache";
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constexpr const char* DATA_ROOT = "/data";
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constexpr const char* METADATA_ROOT = "/metadata";
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static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) {
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bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
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bool is_data = (strcmp(volume, DATA_ROOT) == 0);
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ui->SetBackground(RecoveryUI::ERASING);
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ui->SetProgressType(RecoveryUI::INDETERMINATE);
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std::vector<saved_log_file> log_files;
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if (is_cache) {
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// If we're reformatting /cache, we load any past logs (i.e. "/cache/recovery/last_*") and the
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// current log ("/cache/recovery/log") into memory, so we can restore them after the reformat.
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log_files = ReadLogFilesToMemory();
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}
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ui->Print("Formatting %s...\n", volume);
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ensure_path_unmounted(volume);
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int result;
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if (is_data && convert_fbe) {
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constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe";
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constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
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// Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not
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// full disk encryption.
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if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
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PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR;
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return false;
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}
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FILE* f = fopen(CONVERT_FBE_FILE, "wbe");
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if (!f) {
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PLOG(ERROR) << "Failed to convert to file encryption";
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return false;
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}
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fclose(f);
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result = format_volume(volume, CONVERT_FBE_DIR);
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remove(CONVERT_FBE_FILE);
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rmdir(CONVERT_FBE_DIR);
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} else {
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result = format_volume(volume);
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}
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if (is_cache) {
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RestoreLogFilesAfterFormat(log_files);
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}
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return (result == 0);
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}
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bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
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bool has_cache = volume_for_mount_point("/cache") != nullptr;
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if (!has_cache) {
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ui->Print("No /cache partition found.\n");
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return false;
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}
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if (confirm_func && !confirm_func()) {
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return false;
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}
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ui->Print("\n-- Wiping cache...\n");
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bool success = EraseVolume("/cache", ui, false);
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ui->Print("Cache wipe %s.\n", success ? "complete" : "failed");
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return success;
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}
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bool WipeData(Device* device, bool convert_fbe) {
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RecoveryUI* ui = device->GetUI();
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ui->Print("\n-- Wiping data...\n");
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if (!FinishPendingSnapshotMerges(device)) {
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ui->Print("Unable to check update status or complete merge, cannot wipe partitions.\n");
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return false;
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}
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bool success = device->PreWipeData();
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if (success) {
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success &= EraseVolume(DATA_ROOT, ui, convert_fbe);
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bool has_cache = volume_for_mount_point("/cache") != nullptr;
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if (has_cache) {
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success &= EraseVolume(CACHE_ROOT, ui, false);
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}
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if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
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success &= EraseVolume(METADATA_ROOT, ui, false);
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}
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}
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if (success) {
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success &= device->PostWipeData();
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}
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ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
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return success;
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}
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