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/*
* 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 "install/snapshot_utils.h"
#include "otautil/dirutil.h"
#include "recovery_ui/ui.h"
#include "recovery_utils/logging.h"
#include "recovery_utils/roots.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);
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");
ui->SetBackground(RecoveryUI::ERASING);
ui->SetProgressType(RecoveryUI::INDETERMINATE);
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");
ui->SetBackground(RecoveryUI::ERASING);
ui->SetProgressType(RecoveryUI::INDETERMINATE);
if (!FinishPendingSnapshotMerges(device)) {
ui->Print("Unable to check update status or complete merge, cannot wipe partitions.\n");
return false;
}
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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