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 <stdio.h>
20 #include <string.h>
21 #include <sys/stat.h>
22
23 #include <functional>
24 #include <vector>
25
26 #include <android-base/file.h>
27 #include <android-base/logging.h>
28 #include <android-base/stringprintf.h>
29
30 #include "install/snapshot_utils.h"
31 #include "otautil/dirutil.h"
32 #include "recovery_ui/ui.h"
33 #include "recovery_utils/logging.h"
34 #include "recovery_utils/roots.h"
35
36 constexpr const char* CACHE_ROOT = "/cache";
37 constexpr const char* DATA_ROOT = "/data";
38 constexpr const char* METADATA_ROOT = "/metadata";
39
EraseVolume(const char * volume,RecoveryUI * ui,bool convert_fbe)40 static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) {
41 bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
42 bool is_data = (strcmp(volume, DATA_ROOT) == 0);
43
44 std::vector<saved_log_file> log_files;
45 if (is_cache) {
46 // If we're reformatting /cache, we load any past logs (i.e. "/cache/recovery/last_*") and the
47 // current log ("/cache/recovery/log") into memory, so we can restore them after the reformat.
48 log_files = ReadLogFilesToMemory();
49 }
50
51 ui->Print("Formatting %s...\n", volume);
52
53 ensure_path_unmounted(volume);
54
55 int result;
56 if (is_data && convert_fbe) {
57 constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe";
58 constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
59 // Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not
60 // full disk encryption.
61 if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
62 PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR;
63 return false;
64 }
65 FILE* f = fopen(CONVERT_FBE_FILE, "wbe");
66 if (!f) {
67 PLOG(ERROR) << "Failed to convert to file encryption";
68 return false;
69 }
70 fclose(f);
71 result = format_volume(volume, CONVERT_FBE_DIR);
72 remove(CONVERT_FBE_FILE);
73 rmdir(CONVERT_FBE_DIR);
74 } else {
75 result = format_volume(volume);
76 }
77
78 if (is_cache) {
79 RestoreLogFilesAfterFormat(log_files);
80 }
81
82 return (result == 0);
83 }
84
WipeCache(RecoveryUI * ui,const std::function<bool ()> & confirm_func)85 bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
86 bool has_cache = volume_for_mount_point("/cache") != nullptr;
87 if (!has_cache) {
88 ui->Print("No /cache partition found.\n");
89 return false;
90 }
91
92 if (confirm_func && !confirm_func()) {
93 return false;
94 }
95
96 ui->Print("\n-- Wiping cache...\n");
97 ui->SetBackground(RecoveryUI::ERASING);
98 ui->SetProgressType(RecoveryUI::INDETERMINATE);
99
100 bool success = EraseVolume("/cache", ui, false);
101 ui->Print("Cache wipe %s.\n", success ? "complete" : "failed");
102 return success;
103 }
104
WipeData(Device * device,bool convert_fbe)105 bool WipeData(Device* device, bool convert_fbe) {
106 RecoveryUI* ui = device->GetUI();
107 ui->Print("\n-- Wiping data...\n");
108 ui->SetBackground(RecoveryUI::ERASING);
109 ui->SetProgressType(RecoveryUI::INDETERMINATE);
110
111 if (!FinishPendingSnapshotMerges(device)) {
112 ui->Print("Unable to check update status or complete merge, cannot wipe partitions.\n");
113 return false;
114 }
115
116 bool success = device->PreWipeData();
117 if (success) {
118 success &= EraseVolume(DATA_ROOT, ui, convert_fbe);
119 bool has_cache = volume_for_mount_point("/cache") != nullptr;
120 if (has_cache) {
121 success &= EraseVolume(CACHE_ROOT, ui, false);
122 }
123 if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
124 success &= EraseVolume(METADATA_ROOT, ui, false);
125 }
126 }
127 if (success) {
128 success &= device->PostWipeData();
129 }
130 ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
131 return success;
132 }
133