1 /*
2 * Copyright (C) 2015 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 <stdio.h>
18 #include <unistd.h>
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <fcntl.h>
22 #include <sys/wait.h>
23 #include <errno.h>
24 #include <cutils/partition_utils.h>
25 #include <sys/mount.h>
26
27 #include <ext4_utils/ext4.h>
28 #include <ext4_utils/ext4_utils.h>
29 #include <logwrap/logwrap.h>
30 #include <selinux/android.h>
31 #include <selinux/label.h>
32 #include <selinux/selinux.h>
33
34 #include "fs_mgr_priv.h"
35 #include "cryptfs.h"
36
get_dev_sz(char * fs_blkdev,uint64_t * dev_sz)37 static int get_dev_sz(char *fs_blkdev, uint64_t *dev_sz)
38 {
39 int fd;
40
41 if ((fd = open(fs_blkdev, O_RDONLY)) < 0) {
42 PERROR << "Cannot open block device";
43 return -1;
44 }
45
46 if ((ioctl(fd, BLKGETSIZE64, dev_sz)) == -1) {
47 PERROR << "Cannot get block device size";
48 close(fd);
49 return -1;
50 }
51
52 close(fd);
53 return 0;
54 }
55
format_ext4(char * fs_blkdev,char * fs_mnt_point,bool crypt_footer)56 static int format_ext4(char *fs_blkdev, char *fs_mnt_point, bool crypt_footer)
57 {
58 uint64_t dev_sz;
59 int rc = 0;
60 int status;
61
62 rc = get_dev_sz(fs_blkdev, &dev_sz);
63 if (rc) {
64 return rc;
65 }
66
67 /* Format the partition using the calculated length */
68 if (crypt_footer) {
69 dev_sz -= CRYPT_FOOTER_OFFSET;
70 }
71
72 std::string size_str = std::to_string(dev_sz / 4096);
73 const char* const mke2fs_args[] = {
74 "/system/bin/mke2fs", "-t", "ext4", "-b", "4096", fs_blkdev, size_str.c_str(), nullptr};
75
76 rc = android_fork_execvp_ext(arraysize(mke2fs_args), const_cast<char**>(mke2fs_args), NULL,
77 true, LOG_KLOG, true, nullptr, nullptr, 0);
78 if (rc) {
79 LERROR << "mke2fs returned " << rc;
80 return rc;
81 }
82
83 const char* const e2fsdroid_args[] = {
84 "/system/bin/e2fsdroid",
85 "-e",
86 "-a",
87 fs_mnt_point,
88 fs_blkdev,
89 nullptr};
90
91 rc = android_fork_execvp_ext(arraysize(e2fsdroid_args), const_cast<char**>(e2fsdroid_args),
92 NULL, true, LOG_KLOG, true, nullptr, nullptr, 0);
93 if (rc) {
94 LERROR << "e2fsdroid returned " << rc;
95 }
96
97 return rc;
98 }
99
format_f2fs(char * fs_blkdev,uint64_t dev_sz,bool crypt_footer)100 static int format_f2fs(char *fs_blkdev, uint64_t dev_sz, bool crypt_footer)
101 {
102 int status;
103
104 if (!dev_sz) {
105 int rc = get_dev_sz(fs_blkdev, &dev_sz);
106 if (rc) {
107 return rc;
108 }
109 }
110
111 /* Format the partition using the calculated length */
112 if (crypt_footer) {
113 dev_sz -= CRYPT_FOOTER_OFFSET;
114 }
115
116 std::string size_str = std::to_string(dev_sz / 4096);
117 // clang-format off
118 const char* const args[] = {
119 "/system/bin/make_f2fs",
120 "-d1",
121 "-f",
122 "-O", "encrypt",
123 "-O", "quota",
124 "-O", "verity",
125 "-w", "4096",
126 fs_blkdev,
127 size_str.c_str(),
128 nullptr
129 };
130 // clang-format on
131
132 return android_fork_execvp_ext(arraysize(args), const_cast<char**>(args), NULL, true,
133 LOG_KLOG, true, nullptr, nullptr, 0);
134 }
135
fs_mgr_do_format(struct fstab_rec * fstab,bool crypt_footer)136 int fs_mgr_do_format(struct fstab_rec *fstab, bool crypt_footer)
137 {
138 int rc = -EINVAL;
139
140 LERROR << __FUNCTION__ << ": Format " << fstab->blk_device
141 << " as '" << fstab->fs_type << "'";
142
143 if (!strncmp(fstab->fs_type, "f2fs", 4)) {
144 rc = format_f2fs(fstab->blk_device, fstab->length, crypt_footer);
145 } else if (!strncmp(fstab->fs_type, "ext4", 4)) {
146 rc = format_ext4(fstab->blk_device, fstab->mount_point, crypt_footer);
147 } else {
148 LERROR << "File system type '" << fstab->fs_type << "' is not supported";
149 }
150
151 return rc;
152 }
153