| /* |
| * Copyright (C) 2012 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 <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <ctype.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <libgen.h> |
| #include <time.h> |
| #include <sys/swap.h> |
| #include <dirent.h> |
| #include <ext4.h> |
| #include <ext4_sb.h> |
| #include <ext4_crypt_init_extensions.h> |
| |
| #include <linux/loop.h> |
| #include <private/android_filesystem_config.h> |
| #include <cutils/android_reboot.h> |
| #include <cutils/partition_utils.h> |
| #include <cutils/properties.h> |
| #include <logwrap/logwrap.h> |
| |
| #include "mincrypt/rsa.h" |
| #include "mincrypt/sha.h" |
| #include "mincrypt/sha256.h" |
| |
| #include "ext4_utils.h" |
| #include "wipe.h" |
| |
| #include "fs_mgr_priv.h" |
| #include "fs_mgr_priv_verity.h" |
| |
| #define KEY_LOC_PROP "ro.crypto.keyfile.userdata" |
| #define KEY_IN_FOOTER "footer" |
| |
| #define E2FSCK_BIN "/system/bin/e2fsck" |
| #define F2FS_FSCK_BIN "/system/bin/fsck.f2fs" |
| #define MKSWAP_BIN "/system/bin/mkswap" |
| |
| #define FSCK_LOG_FILE "/dev/fscklogs/log" |
| |
| #define ZRAM_CONF_DEV "/sys/block/zram0/disksize" |
| |
| #define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a))) |
| |
| /* |
| * gettime() - returns the time in seconds of the system's monotonic clock or |
| * zero on error. |
| */ |
| static time_t gettime(void) |
| { |
| struct timespec ts; |
| int ret; |
| |
| ret = clock_gettime(CLOCK_MONOTONIC, &ts); |
| if (ret < 0) { |
| ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno)); |
| return 0; |
| } |
| |
| return ts.tv_sec; |
| } |
| |
| static int wait_for_file(const char *filename, int timeout) |
| { |
| struct stat info; |
| time_t timeout_time = gettime() + timeout; |
| int ret = -1; |
| |
| while (gettime() < timeout_time && ((ret = stat(filename, &info)) < 0)) |
| usleep(10000); |
| |
| return ret; |
| } |
| |
| static void check_fs(char *blk_device, char *fs_type, char *target) |
| { |
| int status; |
| int ret; |
| long tmpmnt_flags = MS_NOATIME | MS_NOEXEC | MS_NOSUID; |
| char tmpmnt_opts[64] = "errors=remount-ro"; |
| char *e2fsck_argv[] = { |
| E2FSCK_BIN, |
| "-f", |
| "-y", |
| blk_device |
| }; |
| |
| /* Check for the types of filesystems we know how to check */ |
| if (!strcmp(fs_type, "ext2") || !strcmp(fs_type, "ext3") || !strcmp(fs_type, "ext4")) { |
| /* |
| * First try to mount and unmount the filesystem. We do this because |
| * the kernel is more efficient than e2fsck in running the journal and |
| * processing orphaned inodes, and on at least one device with a |
| * performance issue in the emmc firmware, it can take e2fsck 2.5 minutes |
| * to do what the kernel does in about a second. |
| * |
| * After mounting and unmounting the filesystem, run e2fsck, and if an |
| * error is recorded in the filesystem superblock, e2fsck will do a full |
| * check. Otherwise, it does nothing. If the kernel cannot mount the |
| * filesytsem due to an error, e2fsck is still run to do a full check |
| * fix the filesystem. |
| */ |
| errno = 0; |
| if (!strcmp(fs_type, "ext4")) { |
| // This option is only valid with ext4 |
| strlcat(tmpmnt_opts, ",nomblk_io_submit", sizeof(tmpmnt_opts)); |
| } |
| ret = mount(blk_device, target, fs_type, tmpmnt_flags, tmpmnt_opts); |
| INFO("%s(): mount(%s,%s,%s)=%d: %s\n", |
| __func__, blk_device, target, fs_type, ret, strerror(errno)); |
| if (!ret) { |
| int i; |
| for (i = 0; i < 5; i++) { |
| // Try to umount 5 times before continuing on. |
| // Should we try rebooting if all attempts fail? |
| int result = umount(target); |
| if (result == 0) { |
| INFO("%s(): unmount(%s) succeeded\n", __func__, target); |
| break; |
| } |
| ERROR("%s(): umount(%s)=%d: %s\n", __func__, target, result, strerror(errno)); |
| sleep(1); |
| } |
| } |
| |
| /* |
| * Some system images do not have e2fsck for licensing reasons |
| * (e.g. recent SDK system images). Detect these and skip the check. |
| */ |
| if (access(E2FSCK_BIN, X_OK)) { |
| INFO("Not running %s on %s (executable not in system image)\n", |
| E2FSCK_BIN, blk_device); |
| } else { |
| INFO("Running %s on %s\n", E2FSCK_BIN, blk_device); |
| |
| ret = android_fork_execvp_ext(ARRAY_SIZE(e2fsck_argv), e2fsck_argv, |
| &status, true, LOG_KLOG | LOG_FILE, |
| true, FSCK_LOG_FILE, NULL, 0); |
| |
| if (ret < 0) { |
| /* No need to check for error in fork, we can't really handle it now */ |
| ERROR("Failed trying to run %s\n", E2FSCK_BIN); |
| } |
| } |
| } else if (!strcmp(fs_type, "f2fs")) { |
| char *f2fs_fsck_argv[] = { |
| F2FS_FSCK_BIN, |
| "-a", |
| blk_device |
| }; |
| INFO("Running %s -a %s\n", F2FS_FSCK_BIN, blk_device); |
| |
| ret = android_fork_execvp_ext(ARRAY_SIZE(f2fs_fsck_argv), f2fs_fsck_argv, |
| &status, true, LOG_KLOG | LOG_FILE, |
| true, FSCK_LOG_FILE, NULL, 0); |
| if (ret < 0) { |
| /* No need to check for error in fork, we can't really handle it now */ |
| ERROR("Failed trying to run %s\n", F2FS_FSCK_BIN); |
| } |
| } |
| |
| return; |
| } |
| |
| static void remove_trailing_slashes(char *n) |
| { |
| int len; |
| |
| len = strlen(n) - 1; |
| while ((*(n + len) == '/') && len) { |
| *(n + len) = '\0'; |
| len--; |
| } |
| } |
| |
| /* |
| * Mark the given block device as read-only, using the BLKROSET ioctl. |
| * Return 0 on success, and -1 on error. |
| */ |
| int fs_mgr_set_blk_ro(const char *blockdev) |
| { |
| int fd; |
| int rc = -1; |
| int ON = 1; |
| |
| fd = TEMP_FAILURE_RETRY(open(blockdev, O_RDONLY | O_CLOEXEC)); |
| if (fd < 0) { |
| // should never happen |
| return rc; |
| } |
| |
| rc = ioctl(fd, BLKROSET, &ON); |
| close(fd); |
| |
| return rc; |
| } |
| |
| /* |
| * __mount(): wrapper around the mount() system call which also |
| * sets the underlying block device to read-only if the mount is read-only. |
| * See "man 2 mount" for return values. |
| */ |
| static int __mount(const char *source, const char *target, const struct fstab_rec *rec) |
| { |
| unsigned long mountflags = rec->flags; |
| int ret; |
| int save_errno; |
| |
| /* We need this because sometimes we have legacy symlinks |
| * that are lingering around and need cleaning up. |
| */ |
| struct stat info; |
| if (!lstat(target, &info)) |
| if ((info.st_mode & S_IFMT) == S_IFLNK) |
| unlink(target); |
| mkdir(target, 0755); |
| ret = mount(source, target, rec->fs_type, mountflags, rec->fs_options); |
| save_errno = errno; |
| INFO("%s(source=%s,target=%s,type=%s)=%d\n", __func__, source, target, rec->fs_type, ret); |
| if ((ret == 0) && (mountflags & MS_RDONLY) != 0) { |
| fs_mgr_set_blk_ro(source); |
| } |
| errno = save_errno; |
| return ret; |
| } |
| |
| static int fs_match(char *in1, char *in2) |
| { |
| char *n1; |
| char *n2; |
| int ret; |
| |
| n1 = strdup(in1); |
| n2 = strdup(in2); |
| |
| remove_trailing_slashes(n1); |
| remove_trailing_slashes(n2); |
| |
| ret = !strcmp(n1, n2); |
| |
| free(n1); |
| free(n2); |
| |
| return ret; |
| } |
| |
| static int device_is_debuggable() { |
| int ret = -1; |
| char value[PROP_VALUE_MAX]; |
| ret = __system_property_get("ro.debuggable", value); |
| if (ret < 0) |
| return ret; |
| return strcmp(value, "1") ? 0 : 1; |
| } |
| |
| static int device_is_secure() { |
| int ret = -1; |
| char value[PROP_VALUE_MAX]; |
| ret = __system_property_get("ro.secure", value); |
| /* If error, we want to fail secure */ |
| if (ret < 0) |
| return 1; |
| return strcmp(value, "0") ? 1 : 0; |
| } |
| |
| static int device_is_force_encrypted() { |
| int ret = -1; |
| char value[PROP_VALUE_MAX]; |
| ret = __system_property_get("ro.vold.forceencryption", value); |
| if (ret < 0) |
| return 0; |
| return strcmp(value, "1") ? 0 : 1; |
| } |
| |
| /* |
| * Tries to mount any of the consecutive fstab entries that match |
| * the mountpoint of the one given by fstab->recs[start_idx]. |
| * |
| * end_idx: On return, will be the last rec that was looked at. |
| * attempted_idx: On return, will indicate which fstab rec |
| * succeeded. In case of failure, it will be the start_idx. |
| * Returns |
| * -1 on failure with errno set to match the 1st mount failure. |
| * 0 on success. |
| */ |
| static int mount_with_alternatives(struct fstab *fstab, int start_idx, int *end_idx, int *attempted_idx) |
| { |
| int i; |
| int mount_errno = 0; |
| int mounted = 0; |
| |
| if (!end_idx || !attempted_idx || start_idx >= fstab->num_entries) { |
| errno = EINVAL; |
| if (end_idx) *end_idx = start_idx; |
| if (attempted_idx) *end_idx = start_idx; |
| return -1; |
| } |
| |
| /* Hunt down an fstab entry for the same mount point that might succeed */ |
| for (i = start_idx; |
| /* We required that fstab entries for the same mountpoint be consecutive */ |
| i < fstab->num_entries && !strcmp(fstab->recs[start_idx].mount_point, fstab->recs[i].mount_point); |
| i++) { |
| /* |
| * Don't try to mount/encrypt the same mount point again. |
| * Deal with alternate entries for the same point which are required to be all following |
| * each other. |
| */ |
| if (mounted) { |
| ERROR("%s(): skipping fstab dup mountpoint=%s rec[%d].fs_type=%s already mounted as %s.\n", __func__, |
| fstab->recs[i].mount_point, i, fstab->recs[i].fs_type, fstab->recs[*attempted_idx].fs_type); |
| continue; |
| } |
| |
| if (fstab->recs[i].fs_mgr_flags & MF_CHECK) { |
| check_fs(fstab->recs[i].blk_device, fstab->recs[i].fs_type, |
| fstab->recs[i].mount_point); |
| } |
| if (!__mount(fstab->recs[i].blk_device, fstab->recs[i].mount_point, &fstab->recs[i])) { |
| *attempted_idx = i; |
| mounted = 1; |
| if (i != start_idx) { |
| ERROR("%s(): Mounted %s on %s with fs_type=%s instead of %s\n", __func__, |
| fstab->recs[i].blk_device, fstab->recs[i].mount_point, fstab->recs[i].fs_type, |
| fstab->recs[start_idx].fs_type); |
| } |
| } else { |
| /* back up errno for crypto decisions */ |
| mount_errno = errno; |
| } |
| } |
| |
| /* Adjust i for the case where it was still withing the recs[] */ |
| if (i < fstab->num_entries) --i; |
| |
| *end_idx = i; |
| if (!mounted) { |
| *attempted_idx = start_idx; |
| errno = mount_errno; |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int translate_ext_labels(struct fstab_rec *rec) |
| { |
| DIR *blockdir = NULL; |
| struct dirent *ent; |
| char *label; |
| size_t label_len; |
| int ret = -1; |
| |
| if (strncmp(rec->blk_device, "LABEL=", 6)) |
| return 0; |
| |
| label = rec->blk_device + 6; |
| label_len = strlen(label); |
| |
| if (label_len > 16) { |
| ERROR("FS label is longer than allowed by filesystem\n"); |
| goto out; |
| } |
| |
| |
| blockdir = opendir("/dev/block"); |
| if (!blockdir) { |
| ERROR("couldn't open /dev/block\n"); |
| goto out; |
| } |
| |
| while ((ent = readdir(blockdir))) { |
| int fd; |
| char super_buf[1024]; |
| struct ext4_super_block *sb; |
| |
| if (ent->d_type != DT_BLK) |
| continue; |
| |
| fd = openat(dirfd(blockdir), ent->d_name, O_RDONLY); |
| if (fd < 0) { |
| ERROR("Cannot open block device /dev/block/%s\n", ent->d_name); |
| goto out; |
| } |
| |
| if (TEMP_FAILURE_RETRY(lseek(fd, 1024, SEEK_SET)) < 0 || |
| TEMP_FAILURE_RETRY(read(fd, super_buf, 1024)) != 1024) { |
| /* Probably a loopback device or something else without a readable |
| * superblock. |
| */ |
| close(fd); |
| continue; |
| } |
| |
| sb = (struct ext4_super_block *)super_buf; |
| if (sb->s_magic != EXT4_SUPER_MAGIC) { |
| INFO("/dev/block/%s not ext{234}\n", ent->d_name); |
| continue; |
| } |
| |
| if (!strncmp(label, sb->s_volume_name, label_len)) { |
| char *new_blk_device; |
| |
| if (asprintf(&new_blk_device, "/dev/block/%s", ent->d_name) < 0) { |
| ERROR("Could not allocate block device string\n"); |
| goto out; |
| } |
| |
| INFO("resolved label %s to %s\n", rec->blk_device, new_blk_device); |
| |
| free(rec->blk_device); |
| rec->blk_device = new_blk_device; |
| ret = 0; |
| break; |
| } |
| } |
| |
| out: |
| closedir(blockdir); |
| return ret; |
| } |
| |
| static bool needs_block_encryption(const struct fstab_rec* rec) |
| { |
| if (device_is_force_encrypted() && fs_mgr_is_encryptable(rec)) return true; |
| if (rec->fs_mgr_flags & MF_FORCECRYPT) return true; |
| if (rec->fs_mgr_flags & MF_CRYPT) { |
| /* Check for existence of convert_fde breadcrumb file */ |
| char convert_fde_name[PATH_MAX]; |
| snprintf(convert_fde_name, sizeof(convert_fde_name), |
| "%s/misc/vold/convert_fde", rec->mount_point); |
| if (access(convert_fde_name, F_OK) == 0) return true; |
| } |
| if (rec->fs_mgr_flags & MF_FORCEFDEORFBE) { |
| /* Check for absence of convert_fbe breadcrumb file */ |
| char convert_fbe_name[PATH_MAX]; |
| snprintf(convert_fbe_name, sizeof(convert_fbe_name), |
| "%s/convert_fbe", rec->mount_point); |
| if (access(convert_fbe_name, F_OK) != 0) return true; |
| } |
| return false; |
| } |
| |
| // Check to see if a mountable volume has encryption requirements |
| static int handle_encryptable(const struct fstab_rec* rec) |
| { |
| /* If this is block encryptable, need to trigger encryption */ |
| if (needs_block_encryption(rec)) { |
| if (umount(rec->mount_point) == 0) { |
| return FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION; |
| } else { |
| WARNING("Could not umount %s (%s) - allow continue unencrypted\n", |
| rec->mount_point, strerror(errno)); |
| return FS_MGR_MNTALL_DEV_NOT_ENCRYPTED; |
| } |
| } else if (rec->fs_mgr_flags & (MF_FILEENCRYPTION | MF_FORCEFDEORFBE)) { |
| // Deal with file level encryption |
| INFO("%s is file encrypted\n", rec->mount_point); |
| return FS_MGR_MNTALL_DEV_FILE_ENCRYPTED; |
| } else if (fs_mgr_is_encryptable(rec)) { |
| return FS_MGR_MNTALL_DEV_NOT_ENCRYPTED; |
| } else { |
| return FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE; |
| } |
| } |
| |
| /* When multiple fstab records share the same mount_point, it will |
| * try to mount each one in turn, and ignore any duplicates after a |
| * first successful mount. |
| * Returns -1 on error, and FS_MGR_MNTALL_* otherwise. |
| */ |
| int fs_mgr_mount_all(struct fstab *fstab) |
| { |
| int i = 0; |
| int encryptable = FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE; |
| int error_count = 0; |
| int mret = -1; |
| int mount_errno = 0; |
| int attempted_idx = -1; |
| |
| if (!fstab) { |
| return -1; |
| } |
| |
| for (i = 0; i < fstab->num_entries; i++) { |
| /* Don't mount entries that are managed by vold */ |
| if (fstab->recs[i].fs_mgr_flags & (MF_VOLDMANAGED | MF_RECOVERYONLY)) { |
| continue; |
| } |
| |
| /* Skip swap and raw partition entries such as boot, recovery, etc */ |
| if (!strcmp(fstab->recs[i].fs_type, "swap") || |
| !strcmp(fstab->recs[i].fs_type, "emmc") || |
| !strcmp(fstab->recs[i].fs_type, "mtd")) { |
| continue; |
| } |
| |
| /* Skip mounting the root partition, as it will already have been mounted */ |
| if (!strcmp(fstab->recs[i].mount_point, "/")) { |
| if ((fstab->recs[i].fs_mgr_flags & MS_RDONLY) != 0) { |
| fs_mgr_set_blk_ro(fstab->recs[i].blk_device); |
| } |
| continue; |
| } |
| |
| /* Translate LABEL= file system labels into block devices */ |
| if (!strcmp(fstab->recs[i].fs_type, "ext2") || |
| !strcmp(fstab->recs[i].fs_type, "ext3") || |
| !strcmp(fstab->recs[i].fs_type, "ext4")) { |
| int tret = translate_ext_labels(&fstab->recs[i]); |
| if (tret < 0) { |
| ERROR("Could not translate label to block device\n"); |
| continue; |
| } |
| } |
| |
| if (fstab->recs[i].fs_mgr_flags & MF_WAIT) { |
| wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT); |
| } |
| |
| if ((fstab->recs[i].fs_mgr_flags & MF_VERIFY) && device_is_secure()) { |
| int rc = fs_mgr_setup_verity(&fstab->recs[i]); |
| if (device_is_debuggable() && rc == FS_MGR_SETUP_VERITY_DISABLED) { |
| INFO("Verity disabled"); |
| } else if (rc != FS_MGR_SETUP_VERITY_SUCCESS) { |
| ERROR("Could not set up verified partition, skipping!\n"); |
| continue; |
| } |
| } |
| int last_idx_inspected; |
| int top_idx = i; |
| |
| mret = mount_with_alternatives(fstab, i, &last_idx_inspected, &attempted_idx); |
| i = last_idx_inspected; |
| mount_errno = errno; |
| |
| /* Deal with encryptability. */ |
| if (!mret) { |
| int status = handle_encryptable(&fstab->recs[attempted_idx]); |
| |
| if (status == FS_MGR_MNTALL_FAIL) { |
| /* Fatal error - no point continuing */ |
| return status; |
| } |
| |
| if (status != FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE) { |
| if (encryptable != FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE) { |
| // Log and continue |
| ERROR("Only one encryptable/encrypted partition supported\n"); |
| } |
| encryptable = status; |
| } |
| |
| /* Success! Go get the next one */ |
| continue; |
| } |
| |
| /* mount(2) returned an error, handle the encryptable/formattable case */ |
| bool wiped = partition_wiped(fstab->recs[top_idx].blk_device); |
| if (mret && mount_errno != EBUSY && mount_errno != EACCES && |
| fs_mgr_is_formattable(&fstab->recs[top_idx]) && wiped) { |
| /* top_idx and attempted_idx point at the same partition, but sometimes |
| * at two different lines in the fstab. Use the top one for formatting |
| * as that is the preferred one. |
| */ |
| ERROR("%s(): %s is wiped and %s %s is formattable. Format it.\n", __func__, |
| fstab->recs[top_idx].blk_device, fstab->recs[top_idx].mount_point, |
| fstab->recs[top_idx].fs_type); |
| if (fs_mgr_is_encryptable(&fstab->recs[top_idx]) && |
| strcmp(fstab->recs[top_idx].key_loc, KEY_IN_FOOTER)) { |
| int fd = open(fstab->recs[top_idx].key_loc, O_WRONLY, 0644); |
| if (fd >= 0) { |
| INFO("%s(): also wipe %s\n", __func__, fstab->recs[top_idx].key_loc); |
| wipe_block_device(fd, get_file_size(fd)); |
| close(fd); |
| } else { |
| ERROR("%s(): %s wouldn't open (%s)\n", __func__, |
| fstab->recs[top_idx].key_loc, strerror(errno)); |
| } |
| } |
| if (fs_mgr_do_format(&fstab->recs[top_idx]) == 0) { |
| /* Let's replay the mount actions. */ |
| i = top_idx - 1; |
| continue; |
| } else { |
| ERROR("%s(): Format failed. Suggest recovery...\n", __func__); |
| encryptable = FS_MGR_MNTALL_DEV_NEEDS_RECOVERY; |
| continue; |
| } |
| } |
| if (mret && mount_errno != EBUSY && mount_errno != EACCES && |
| fs_mgr_is_encryptable(&fstab->recs[attempted_idx])) { |
| if (wiped) { |
| ERROR("%s(): %s is wiped and %s %s is encryptable. Suggest recovery...\n", __func__, |
| fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, |
| fstab->recs[attempted_idx].fs_type); |
| encryptable = FS_MGR_MNTALL_DEV_NEEDS_RECOVERY; |
| continue; |
| } else { |
| /* Need to mount a tmpfs at this mountpoint for now, and set |
| * properties that vold will query later for decrypting |
| */ |
| ERROR("%s(): possibly an encryptable blkdev %s for mount %s type %s )\n", __func__, |
| fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, |
| fstab->recs[attempted_idx].fs_type); |
| if (fs_mgr_do_tmpfs_mount(fstab->recs[attempted_idx].mount_point) < 0) { |
| ++error_count; |
| continue; |
| } |
| } |
| encryptable = FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED; |
| } else { |
| if (fs_mgr_is_nofail(&fstab->recs[attempted_idx])) { |
| ERROR("Ignoring failure to mount an un-encryptable or wiped partition on" |
| "%s at %s options: %s error: %s\n", |
| fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, |
| fstab->recs[attempted_idx].fs_options, strerror(mount_errno)); |
| } else { |
| ERROR("Failed to mount an un-encryptable or wiped partition on" |
| "%s at %s options: %s error: %s\n", |
| fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, |
| fstab->recs[attempted_idx].fs_options, strerror(mount_errno)); |
| ++error_count; |
| } |
| continue; |
| } |
| } |
| |
| if (error_count) { |
| return -1; |
| } else { |
| return encryptable; |
| } |
| } |
| |
| /* If tmp_mount_point is non-null, mount the filesystem there. This is for the |
| * tmp mount we do to check the user password |
| * If multiple fstab entries are to be mounted on "n_name", it will try to mount each one |
| * in turn, and stop on 1st success, or no more match. |
| */ |
| int fs_mgr_do_mount(struct fstab *fstab, char *n_name, char *n_blk_device, |
| char *tmp_mount_point) |
| { |
| int i = 0; |
| int ret = FS_MGR_DOMNT_FAILED; |
| int mount_errors = 0; |
| int first_mount_errno = 0; |
| char *m; |
| |
| if (!fstab) { |
| return ret; |
| } |
| |
| for (i = 0; i < fstab->num_entries; i++) { |
| if (!fs_match(fstab->recs[i].mount_point, n_name)) { |
| continue; |
| } |
| |
| /* We found our match */ |
| /* If this swap or a raw partition, report an error */ |
| if (!strcmp(fstab->recs[i].fs_type, "swap") || |
| !strcmp(fstab->recs[i].fs_type, "emmc") || |
| !strcmp(fstab->recs[i].fs_type, "mtd")) { |
| ERROR("Cannot mount filesystem of type %s on %s\n", |
| fstab->recs[i].fs_type, n_blk_device); |
| goto out; |
| } |
| |
| /* First check the filesystem if requested */ |
| if (fstab->recs[i].fs_mgr_flags & MF_WAIT) { |
| wait_for_file(n_blk_device, WAIT_TIMEOUT); |
| } |
| |
| if (fstab->recs[i].fs_mgr_flags & MF_CHECK) { |
| check_fs(n_blk_device, fstab->recs[i].fs_type, |
| fstab->recs[i].mount_point); |
| } |
| |
| if ((fstab->recs[i].fs_mgr_flags & MF_VERIFY) && device_is_secure()) { |
| int rc = fs_mgr_setup_verity(&fstab->recs[i]); |
| if (device_is_debuggable() && rc == FS_MGR_SETUP_VERITY_DISABLED) { |
| INFO("Verity disabled"); |
| } else if (rc != FS_MGR_SETUP_VERITY_SUCCESS) { |
| ERROR("Could not set up verified partition, skipping!\n"); |
| continue; |
| } |
| } |
| |
| /* Now mount it where requested */ |
| if (tmp_mount_point) { |
| m = tmp_mount_point; |
| } else { |
| m = fstab->recs[i].mount_point; |
| } |
| if (__mount(n_blk_device, m, &fstab->recs[i])) { |
| if (!first_mount_errno) first_mount_errno = errno; |
| mount_errors++; |
| continue; |
| } else { |
| ret = 0; |
| goto out; |
| } |
| } |
| if (mount_errors) { |
| ERROR("Cannot mount filesystem on %s at %s. error: %s\n", |
| n_blk_device, m, strerror(first_mount_errno)); |
| if (first_mount_errno == EBUSY) { |
| ret = FS_MGR_DOMNT_BUSY; |
| } else { |
| ret = FS_MGR_DOMNT_FAILED; |
| } |
| } else { |
| /* We didn't find a match, say so and return an error */ |
| ERROR("Cannot find mount point %s in fstab\n", fstab->recs[i].mount_point); |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * mount a tmpfs filesystem at the given point. |
| * return 0 on success, non-zero on failure. |
| */ |
| int fs_mgr_do_tmpfs_mount(char *n_name) |
| { |
| int ret; |
| |
| ret = mount("tmpfs", n_name, "tmpfs", |
| MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS); |
| if (ret < 0) { |
| ERROR("Cannot mount tmpfs filesystem at %s\n", n_name); |
| return -1; |
| } |
| |
| /* Success */ |
| return 0; |
| } |
| |
| int fs_mgr_unmount_all(struct fstab *fstab) |
| { |
| int i = 0; |
| int ret = 0; |
| |
| if (!fstab) { |
| return -1; |
| } |
| |
| while (fstab->recs[i].blk_device) { |
| if (umount(fstab->recs[i].mount_point)) { |
| ERROR("Cannot unmount filesystem at %s\n", fstab->recs[i].mount_point); |
| ret = -1; |
| } |
| i++; |
| } |
| |
| return ret; |
| } |
| |
| /* This must be called after mount_all, because the mkswap command needs to be |
| * available. |
| */ |
| int fs_mgr_swapon_all(struct fstab *fstab) |
| { |
| int i = 0; |
| int flags = 0; |
| int err = 0; |
| int ret = 0; |
| int status; |
| char *mkswap_argv[2] = { |
| MKSWAP_BIN, |
| NULL |
| }; |
| |
| if (!fstab) { |
| return -1; |
| } |
| |
| for (i = 0; i < fstab->num_entries; i++) { |
| /* Skip non-swap entries */ |
| if (strcmp(fstab->recs[i].fs_type, "swap")) { |
| continue; |
| } |
| |
| if (fstab->recs[i].zram_size > 0) { |
| /* A zram_size was specified, so we need to configure the |
| * device. There is no point in having multiple zram devices |
| * on a system (all the memory comes from the same pool) so |
| * we can assume the device number is 0. |
| */ |
| FILE *zram_fp; |
| |
| zram_fp = fopen(ZRAM_CONF_DEV, "r+"); |
| if (zram_fp == NULL) { |
| ERROR("Unable to open zram conf device %s\n", ZRAM_CONF_DEV); |
| ret = -1; |
| continue; |
| } |
| fprintf(zram_fp, "%d\n", fstab->recs[i].zram_size); |
| fclose(zram_fp); |
| } |
| |
| if (fstab->recs[i].fs_mgr_flags & MF_WAIT) { |
| wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT); |
| } |
| |
| /* Initialize the swap area */ |
| mkswap_argv[1] = fstab->recs[i].blk_device; |
| err = android_fork_execvp_ext(ARRAY_SIZE(mkswap_argv), mkswap_argv, |
| &status, true, LOG_KLOG, false, NULL, |
| NULL, 0); |
| if (err) { |
| ERROR("mkswap failed for %s\n", fstab->recs[i].blk_device); |
| ret = -1; |
| continue; |
| } |
| |
| /* If -1, then no priority was specified in fstab, so don't set |
| * SWAP_FLAG_PREFER or encode the priority */ |
| if (fstab->recs[i].swap_prio >= 0) { |
| flags = (fstab->recs[i].swap_prio << SWAP_FLAG_PRIO_SHIFT) & |
| SWAP_FLAG_PRIO_MASK; |
| flags |= SWAP_FLAG_PREFER; |
| } else { |
| flags = 0; |
| } |
| err = swapon(fstab->recs[i].blk_device, flags); |
| if (err) { |
| ERROR("swapon failed for %s\n", fstab->recs[i].blk_device); |
| ret = -1; |
| } |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * key_loc must be at least PROPERTY_VALUE_MAX bytes long |
| * |
| * real_blk_device must be at least PROPERTY_VALUE_MAX bytes long |
| */ |
| int fs_mgr_get_crypt_info(struct fstab *fstab, char *key_loc, char *real_blk_device, int size) |
| { |
| int i = 0; |
| |
| if (!fstab) { |
| return -1; |
| } |
| /* Initialize return values to null strings */ |
| if (key_loc) { |
| *key_loc = '\0'; |
| } |
| if (real_blk_device) { |
| *real_blk_device = '\0'; |
| } |
| |
| /* Look for the encryptable partition to find the data */ |
| for (i = 0; i < fstab->num_entries; i++) { |
| /* Don't deal with vold managed enryptable partitions here */ |
| if (fstab->recs[i].fs_mgr_flags & MF_VOLDMANAGED) { |
| continue; |
| } |
| if (!(fstab->recs[i].fs_mgr_flags |
| & (MF_CRYPT | MF_FORCECRYPT | MF_FORCEFDEORFBE))) { |
| continue; |
| } |
| |
| /* We found a match */ |
| if (key_loc) { |
| strlcpy(key_loc, fstab->recs[i].key_loc, size); |
| } |
| if (real_blk_device) { |
| strlcpy(real_blk_device, fstab->recs[i].blk_device, size); |
| } |
| break; |
| } |
| |
| return 0; |
| } |
