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 ui->SetBackground(RecoveryUI::ERASING);
45 ui->SetProgressType(RecoveryUI::INDETERMINATE);
46
47 std::vector<saved_log_file> log_files;
48 if (is_cache) {
49 // If we're reformatting /cache, we load any past logs (i.e. "/cache/recovery/last_*") and the
50 // current log ("/cache/recovery/log") into memory, so we can restore them after the reformat.
51 log_files = ReadLogFilesToMemory();
52 }
53
54 ui->Print("Formatting %s...\n", volume);
55
56 ensure_path_unmounted(volume);
57
58 int result;
59 if (is_data && convert_fbe) {
60 constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe";
61 constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
62 // Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not
63 // full disk encryption.
64 if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
65 PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR;
66 return false;
67 }
68 FILE* f = fopen(CONVERT_FBE_FILE, "wbe");
69 if (!f) {
70 PLOG(ERROR) << "Failed to convert to file encryption";
71 return false;
72 }
73 fclose(f);
74 result = format_volume(volume, CONVERT_FBE_DIR);
75 remove(CONVERT_FBE_FILE);
76 rmdir(CONVERT_FBE_DIR);
77 } else {
78 result = format_volume(volume);
79 }
80
81 if (is_cache) {
82 RestoreLogFilesAfterFormat(log_files);
83 }
84
85 return (result == 0);
86 }
87
WipeCache(RecoveryUI * ui,const std::function<bool ()> & confirm_func)88 bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
89 bool has_cache = volume_for_mount_point("/cache") != nullptr;
90 if (!has_cache) {
91 ui->Print("No /cache partition found.\n");
92 return false;
93 }
94
95 if (confirm_func && !confirm_func()) {
96 return false;
97 }
98
99 ui->Print("\n-- Wiping cache...\n");
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
109 if (!FinishPendingSnapshotMerges(device)) {
110 ui->Print("Unable to check update status or complete merge, cannot wipe partitions.\n");
111 return false;
112 }
113
114 bool success = device->PreWipeData();
115 if (success) {
116 success &= EraseVolume(DATA_ROOT, ui, convert_fbe);
117 bool has_cache = volume_for_mount_point("/cache") != nullptr;
118 if (has_cache) {
119 success &= EraseVolume(CACHE_ROOT, ui, false);
120 }
121 if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
122 success &= EraseVolume(METADATA_ROOT, ui, false);
123 }
124 }
125 if (success) {
126 success &= device->PostWipeData();
127 }
128 ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
129 return success;
130 }
131