1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "install/wipe_data.h"
18
19 #include <string.h>
20
21 #include <functional>
22 #include <vector>
23
24 #include <android-base/file.h>
25 #include <android-base/logging.h>
26 #include <android-base/stringprintf.h>
27
28 #include "bootloader_message/bootloader_message.h"
29 #include "install/snapshot_utils.h"
30 #include "otautil/dirutil.h"
31 #include "recovery_ui/ui.h"
32 #include "recovery_utils/logging.h"
33 #include "recovery_utils/roots.h"
34
35 constexpr const char* CACHE_ROOT = "/cache";
36 constexpr const char* DATA_ROOT = "/data";
37 constexpr const char* METADATA_ROOT = "/metadata";
38
EraseVolume(const char * volume,RecoveryUI * ui)39 static bool EraseVolume(const char* volume, RecoveryUI* ui) {
40 bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
41
42 std::vector<saved_log_file> log_files;
43 if (is_cache) {
44 // If we're reformatting /cache, we load any past logs (i.e. "/cache/recovery/last_*") and the
45 // current log ("/cache/recovery/log") into memory, so we can restore them after the reformat.
46 log_files = ReadLogFilesToMemory();
47 }
48
49 ui->Print("Formatting %s...\n", volume);
50
51 ensure_path_unmounted(volume);
52
53 int result = format_volume(volume);
54
55 if (is_cache) {
56 RestoreLogFilesAfterFormat(log_files);
57 }
58
59 return (result == 0);
60 }
61
WipeCache(RecoveryUI * ui,const std::function<bool ()> & confirm_func)62 bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
63 bool has_cache = volume_for_mount_point("/cache") != nullptr;
64 if (!has_cache) {
65 ui->Print("No /cache partition found.\n");
66 return false;
67 }
68
69 if (confirm_func && !confirm_func()) {
70 return false;
71 }
72
73 ui->Print("\n-- Wiping cache...\n");
74 ui->SetBackground(RecoveryUI::ERASING);
75 ui->SetProgressType(RecoveryUI::INDETERMINATE);
76
77 bool success = EraseVolume("/cache", ui);
78 ui->Print("Cache wipe %s.\n", success ? "complete" : "failed");
79 return success;
80 }
81
WipeData(Device * device)82 bool WipeData(Device* device) {
83 RecoveryUI* ui = device->GetUI();
84 ui->Print("\n-- Wiping data...\n");
85 ui->SetBackground(RecoveryUI::ERASING);
86 ui->SetProgressType(RecoveryUI::INDETERMINATE);
87
88 if (!FinishPendingSnapshotMerges(device)) {
89 ui->Print("Unable to check update status or complete merge, cannot wipe partitions.\n");
90 return false;
91 }
92
93 bool success = device->PreWipeData();
94 if (success) {
95 success &= EraseVolume(DATA_ROOT, ui);
96 bool has_cache = volume_for_mount_point("/cache") != nullptr;
97 if (has_cache) {
98 success &= EraseVolume(CACHE_ROOT, ui);
99 }
100 if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
101 success &= EraseVolume(METADATA_ROOT, ui);
102 }
103 }
104 ui->Print("Resetting memtag message...\n");
105 std::string err;
106 if (!WriteMiscMemtagMessage({}, &err)) {
107 ui->Print("Failed to reset memtag message: %s\n", err.c_str());
108 success = false;
109 }
110 if (success) {
111 success &= device->PostWipeData();
112 }
113 ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
114 return success;
115 }
116