1 /* 2 * Copyright (C) 2012 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 <stdlib.h> 19 #include <string.h> 20 #include <unistd.h> 21 #include <fcntl.h> 22 #include <ctype.h> 23 #include <sys/mount.h> 24 #include <sys/stat.h> 25 #include <errno.h> 26 #include <sys/types.h> 27 #include <sys/wait.h> 28 #include <libgen.h> 29 #include <time.h> 30 #include <sys/swap.h> 31 #include <dirent.h> 32 #include <ext4.h> 33 #include <ext4_sb.h> 34 #include <ext4_crypt_init_extensions.h> 35 36 #include <linux/loop.h> 37 #include <private/android_filesystem_config.h> 38 #include <cutils/android_reboot.h> 39 #include <cutils/partition_utils.h> 40 #include <cutils/properties.h> 41 #include <logwrap/logwrap.h> 42 43 #include "mincrypt/rsa.h" 44 #include "mincrypt/sha.h" 45 #include "mincrypt/sha256.h" 46 47 #include "ext4_utils.h" 48 #include "wipe.h" 49 50 #include "fs_mgr_priv.h" 51 #include "fs_mgr_priv_verity.h" 52 53 #define KEY_LOC_PROP "ro.crypto.keyfile.userdata" 54 #define KEY_IN_FOOTER "footer" 55 56 #define E2FSCK_BIN "/system/bin/e2fsck" 57 #define F2FS_FSCK_BIN "/system/bin/fsck.f2fs" 58 #define MKSWAP_BIN "/system/bin/mkswap" 59 60 #define FSCK_LOG_FILE "/dev/fscklogs/log" 61 62 #define ZRAM_CONF_DEV "/sys/block/zram0/disksize" 63 64 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a))) 65 66 /* 67 * gettime() - returns the time in seconds of the system's monotonic clock or 68 * zero on error. 69 */ 70 static time_t gettime(void) 71 { 72 struct timespec ts; 73 int ret; 74 75 ret = clock_gettime(CLOCK_MONOTONIC, &ts); 76 if (ret < 0) { 77 ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno)); 78 return 0; 79 } 80 81 return ts.tv_sec; 82 } 83 84 static int wait_for_file(const char *filename, int timeout) 85 { 86 struct stat info; 87 time_t timeout_time = gettime() + timeout; 88 int ret = -1; 89 90 while (gettime() < timeout_time && ((ret = stat(filename, &info)) < 0)) 91 usleep(10000); 92 93 return ret; 94 } 95 96 static void check_fs(char *blk_device, char *fs_type, char *target) 97 { 98 int status; 99 int ret; 100 long tmpmnt_flags = MS_NOATIME | MS_NOEXEC | MS_NOSUID; 101 char tmpmnt_opts[64] = "errors=remount-ro"; 102 char *e2fsck_argv[] = { 103 E2FSCK_BIN, 104 "-f", 105 "-y", 106 blk_device 107 }; 108 109 /* Check for the types of filesystems we know how to check */ 110 if (!strcmp(fs_type, "ext2") || !strcmp(fs_type, "ext3") || !strcmp(fs_type, "ext4")) { 111 /* 112 * First try to mount and unmount the filesystem. We do this because 113 * the kernel is more efficient than e2fsck in running the journal and 114 * processing orphaned inodes, and on at least one device with a 115 * performance issue in the emmc firmware, it can take e2fsck 2.5 minutes 116 * to do what the kernel does in about a second. 117 * 118 * After mounting and unmounting the filesystem, run e2fsck, and if an 119 * error is recorded in the filesystem superblock, e2fsck will do a full 120 * check. Otherwise, it does nothing. If the kernel cannot mount the 121 * filesytsem due to an error, e2fsck is still run to do a full check 122 * fix the filesystem. 123 */ 124 errno = 0; 125 if (!strcmp(fs_type, "ext4")) { 126 // This option is only valid with ext4 127 strlcat(tmpmnt_opts, ",nomblk_io_submit", sizeof(tmpmnt_opts)); 128 } 129 ret = mount(blk_device, target, fs_type, tmpmnt_flags, tmpmnt_opts); 130 INFO("%s(): mount(%s,%s,%s)=%d: %s\n", 131 __func__, blk_device, target, fs_type, ret, strerror(errno)); 132 if (!ret) { 133 int i; 134 for (i = 0; i < 5; i++) { 135 // Try to umount 5 times before continuing on. 136 // Should we try rebooting if all attempts fail? 137 int result = umount(target); 138 if (result == 0) { 139 INFO("%s(): unmount(%s) succeeded\n", __func__, target); 140 break; 141 } 142 ERROR("%s(): umount(%s)=%d: %s\n", __func__, target, result, strerror(errno)); 143 sleep(1); 144 } 145 } 146 147 /* 148 * Some system images do not have e2fsck for licensing reasons 149 * (e.g. recent SDK system images). Detect these and skip the check. 150 */ 151 if (access(E2FSCK_BIN, X_OK)) { 152 INFO("Not running %s on %s (executable not in system image)\n", 153 E2FSCK_BIN, blk_device); 154 } else { 155 INFO("Running %s on %s\n", E2FSCK_BIN, blk_device); 156 157 ret = android_fork_execvp_ext(ARRAY_SIZE(e2fsck_argv), e2fsck_argv, 158 &status, true, LOG_KLOG | LOG_FILE, 159 true, FSCK_LOG_FILE, NULL, 0); 160 161 if (ret < 0) { 162 /* No need to check for error in fork, we can't really handle it now */ 163 ERROR("Failed trying to run %s\n", E2FSCK_BIN); 164 } 165 } 166 } else if (!strcmp(fs_type, "f2fs")) { 167 char *f2fs_fsck_argv[] = { 168 F2FS_FSCK_BIN, 169 "-a", 170 blk_device 171 }; 172 INFO("Running %s -a %s\n", F2FS_FSCK_BIN, blk_device); 173 174 ret = android_fork_execvp_ext(ARRAY_SIZE(f2fs_fsck_argv), f2fs_fsck_argv, 175 &status, true, LOG_KLOG | LOG_FILE, 176 true, FSCK_LOG_FILE, NULL, 0); 177 if (ret < 0) { 178 /* No need to check for error in fork, we can't really handle it now */ 179 ERROR("Failed trying to run %s\n", F2FS_FSCK_BIN); 180 } 181 } 182 183 return; 184 } 185 186 static void remove_trailing_slashes(char *n) 187 { 188 int len; 189 190 len = strlen(n) - 1; 191 while ((*(n + len) == '/') && len) { 192 *(n + len) = '\0'; 193 len--; 194 } 195 } 196 197 /* 198 * Mark the given block device as read-only, using the BLKROSET ioctl. 199 * Return 0 on success, and -1 on error. 200 */ 201 int fs_mgr_set_blk_ro(const char *blockdev) 202 { 203 int fd; 204 int rc = -1; 205 int ON = 1; 206 207 fd = TEMP_FAILURE_RETRY(open(blockdev, O_RDONLY | O_CLOEXEC)); 208 if (fd < 0) { 209 // should never happen 210 return rc; 211 } 212 213 rc = ioctl(fd, BLKROSET, &ON); 214 close(fd); 215 216 return rc; 217 } 218 219 /* 220 * __mount(): wrapper around the mount() system call which also 221 * sets the underlying block device to read-only if the mount is read-only. 222 * See "man 2 mount" for return values. 223 */ 224 static int __mount(const char *source, const char *target, const struct fstab_rec *rec) 225 { 226 unsigned long mountflags = rec->flags; 227 int ret; 228 int save_errno; 229 230 /* We need this because sometimes we have legacy symlinks 231 * that are lingering around and need cleaning up. 232 */ 233 struct stat info; 234 if (!lstat(target, &info)) 235 if ((info.st_mode & S_IFMT) == S_IFLNK) 236 unlink(target); 237 mkdir(target, 0755); 238 ret = mount(source, target, rec->fs_type, mountflags, rec->fs_options); 239 save_errno = errno; 240 INFO("%s(source=%s,target=%s,type=%s)=%d\n", __func__, source, target, rec->fs_type, ret); 241 if ((ret == 0) && (mountflags & MS_RDONLY) != 0) { 242 fs_mgr_set_blk_ro(source); 243 } 244 errno = save_errno; 245 return ret; 246 } 247 248 static int fs_match(char *in1, char *in2) 249 { 250 char *n1; 251 char *n2; 252 int ret; 253 254 n1 = strdup(in1); 255 n2 = strdup(in2); 256 257 remove_trailing_slashes(n1); 258 remove_trailing_slashes(n2); 259 260 ret = !strcmp(n1, n2); 261 262 free(n1); 263 free(n2); 264 265 return ret; 266 } 267 268 static int device_is_debuggable() { 269 int ret = -1; 270 char value[PROP_VALUE_MAX]; 271 ret = __system_property_get("ro.debuggable", value); 272 if (ret < 0) 273 return ret; 274 return strcmp(value, "1") ? 0 : 1; 275 } 276 277 static int device_is_secure() { 278 int ret = -1; 279 char value[PROP_VALUE_MAX]; 280 ret = __system_property_get("ro.secure", value); 281 /* If error, we want to fail secure */ 282 if (ret < 0) 283 return 1; 284 return strcmp(value, "0") ? 1 : 0; 285 } 286 287 static int device_is_force_encrypted() { 288 int ret = -1; 289 char value[PROP_VALUE_MAX]; 290 ret = __system_property_get("ro.vold.forceencryption", value); 291 if (ret < 0) 292 return 0; 293 return strcmp(value, "1") ? 0 : 1; 294 } 295 296 /* 297 * Tries to mount any of the consecutive fstab entries that match 298 * the mountpoint of the one given by fstab->recs[start_idx]. 299 * 300 * end_idx: On return, will be the last rec that was looked at. 301 * attempted_idx: On return, will indicate which fstab rec 302 * succeeded. In case of failure, it will be the start_idx. 303 * Returns 304 * -1 on failure with errno set to match the 1st mount failure. 305 * 0 on success. 306 */ 307 static int mount_with_alternatives(struct fstab *fstab, int start_idx, int *end_idx, int *attempted_idx) 308 { 309 int i; 310 int mount_errno = 0; 311 int mounted = 0; 312 313 if (!end_idx || !attempted_idx || start_idx >= fstab->num_entries) { 314 errno = EINVAL; 315 if (end_idx) *end_idx = start_idx; 316 if (attempted_idx) *end_idx = start_idx; 317 return -1; 318 } 319 320 /* Hunt down an fstab entry for the same mount point that might succeed */ 321 for (i = start_idx; 322 /* We required that fstab entries for the same mountpoint be consecutive */ 323 i < fstab->num_entries && !strcmp(fstab->recs[start_idx].mount_point, fstab->recs[i].mount_point); 324 i++) { 325 /* 326 * Don't try to mount/encrypt the same mount point again. 327 * Deal with alternate entries for the same point which are required to be all following 328 * each other. 329 */ 330 if (mounted) { 331 ERROR("%s(): skipping fstab dup mountpoint=%s rec[%d].fs_type=%s already mounted as %s.\n", __func__, 332 fstab->recs[i].mount_point, i, fstab->recs[i].fs_type, fstab->recs[*attempted_idx].fs_type); 333 continue; 334 } 335 336 if (fstab->recs[i].fs_mgr_flags & MF_CHECK) { 337 check_fs(fstab->recs[i].blk_device, fstab->recs[i].fs_type, 338 fstab->recs[i].mount_point); 339 } 340 if (!__mount(fstab->recs[i].blk_device, fstab->recs[i].mount_point, &fstab->recs[i])) { 341 *attempted_idx = i; 342 mounted = 1; 343 if (i != start_idx) { 344 ERROR("%s(): Mounted %s on %s with fs_type=%s instead of %s\n", __func__, 345 fstab->recs[i].blk_device, fstab->recs[i].mount_point, fstab->recs[i].fs_type, 346 fstab->recs[start_idx].fs_type); 347 } 348 } else { 349 /* back up errno for crypto decisions */ 350 mount_errno = errno; 351 } 352 } 353 354 /* Adjust i for the case where it was still withing the recs[] */ 355 if (i < fstab->num_entries) --i; 356 357 *end_idx = i; 358 if (!mounted) { 359 *attempted_idx = start_idx; 360 errno = mount_errno; 361 return -1; 362 } 363 return 0; 364 } 365 366 static int translate_ext_labels(struct fstab_rec *rec) 367 { 368 DIR *blockdir = NULL; 369 struct dirent *ent; 370 char *label; 371 size_t label_len; 372 int ret = -1; 373 374 if (strncmp(rec->blk_device, "LABEL=", 6)) 375 return 0; 376 377 label = rec->blk_device + 6; 378 label_len = strlen(label); 379 380 if (label_len > 16) { 381 ERROR("FS label is longer than allowed by filesystem\n"); 382 goto out; 383 } 384 385 386 blockdir = opendir("/dev/block"); 387 if (!blockdir) { 388 ERROR("couldn't open /dev/block\n"); 389 goto out; 390 } 391 392 while ((ent = readdir(blockdir))) { 393 int fd; 394 char super_buf[1024]; 395 struct ext4_super_block *sb; 396 397 if (ent->d_type != DT_BLK) 398 continue; 399 400 fd = openat(dirfd(blockdir), ent->d_name, O_RDONLY); 401 if (fd < 0) { 402 ERROR("Cannot open block device /dev/block/%s\n", ent->d_name); 403 goto out; 404 } 405 406 if (TEMP_FAILURE_RETRY(lseek(fd, 1024, SEEK_SET)) < 0 || 407 TEMP_FAILURE_RETRY(read(fd, super_buf, 1024)) != 1024) { 408 /* Probably a loopback device or something else without a readable 409 * superblock. 410 */ 411 close(fd); 412 continue; 413 } 414 415 sb = (struct ext4_super_block *)super_buf; 416 if (sb->s_magic != EXT4_SUPER_MAGIC) { 417 INFO("/dev/block/%s not ext{234}\n", ent->d_name); 418 continue; 419 } 420 421 if (!strncmp(label, sb->s_volume_name, label_len)) { 422 char *new_blk_device; 423 424 if (asprintf(&new_blk_device, "/dev/block/%s", ent->d_name) < 0) { 425 ERROR("Could not allocate block device string\n"); 426 goto out; 427 } 428 429 INFO("resolved label %s to %s\n", rec->blk_device, new_blk_device); 430 431 free(rec->blk_device); 432 rec->blk_device = new_blk_device; 433 ret = 0; 434 break; 435 } 436 } 437 438 out: 439 closedir(blockdir); 440 return ret; 441 } 442 443 static bool needs_block_encryption(const struct fstab_rec* rec) 444 { 445 if (device_is_force_encrypted() && fs_mgr_is_encryptable(rec)) return true; 446 if (rec->fs_mgr_flags & MF_FORCECRYPT) return true; 447 if (rec->fs_mgr_flags & MF_CRYPT) { 448 /* Check for existence of convert_fde breadcrumb file */ 449 char convert_fde_name[PATH_MAX]; 450 snprintf(convert_fde_name, sizeof(convert_fde_name), 451 "%s/misc/vold/convert_fde", rec->mount_point); 452 if (access(convert_fde_name, F_OK) == 0) return true; 453 } 454 if (rec->fs_mgr_flags & MF_FORCEFDEORFBE) { 455 /* Check for absence of convert_fbe breadcrumb file */ 456 char convert_fbe_name[PATH_MAX]; 457 snprintf(convert_fbe_name, sizeof(convert_fbe_name), 458 "%s/convert_fbe", rec->mount_point); 459 if (access(convert_fbe_name, F_OK) != 0) return true; 460 } 461 return false; 462 } 463 464 // Check to see if a mountable volume has encryption requirements 465 static int handle_encryptable(const struct fstab_rec* rec) 466 { 467 /* If this is block encryptable, need to trigger encryption */ 468 if (needs_block_encryption(rec)) { 469 if (umount(rec->mount_point) == 0) { 470 return FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION; 471 } else { 472 WARNING("Could not umount %s (%s) - allow continue unencrypted\n", 473 rec->mount_point, strerror(errno)); 474 return FS_MGR_MNTALL_DEV_NOT_ENCRYPTED; 475 } 476 } else if (rec->fs_mgr_flags & (MF_FILEENCRYPTION | MF_FORCEFDEORFBE)) { 477 // Deal with file level encryption 478 INFO("%s is file encrypted\n", rec->mount_point); 479 return FS_MGR_MNTALL_DEV_FILE_ENCRYPTED; 480 } else if (fs_mgr_is_encryptable(rec)) { 481 return FS_MGR_MNTALL_DEV_NOT_ENCRYPTED; 482 } else { 483 return FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE; 484 } 485 } 486 487 /* When multiple fstab records share the same mount_point, it will 488 * try to mount each one in turn, and ignore any duplicates after a 489 * first successful mount. 490 * Returns -1 on error, and FS_MGR_MNTALL_* otherwise. 491 */ 492 int fs_mgr_mount_all(struct fstab *fstab) 493 { 494 int i = 0; 495 int encryptable = FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE; 496 int error_count = 0; 497 int mret = -1; 498 int mount_errno = 0; 499 int attempted_idx = -1; 500 501 if (!fstab) { 502 return -1; 503 } 504 505 for (i = 0; i < fstab->num_entries; i++) { 506 /* Don't mount entries that are managed by vold */ 507 if (fstab->recs[i].fs_mgr_flags & (MF_VOLDMANAGED | MF_RECOVERYONLY)) { 508 continue; 509 } 510 511 /* Skip swap and raw partition entries such as boot, recovery, etc */ 512 if (!strcmp(fstab->recs[i].fs_type, "swap") || 513 !strcmp(fstab->recs[i].fs_type, "emmc") || 514 !strcmp(fstab->recs[i].fs_type, "mtd")) { 515 continue; 516 } 517 518 /* Skip mounting the root partition, as it will already have been mounted */ 519 if (!strcmp(fstab->recs[i].mount_point, "/")) { 520 if ((fstab->recs[i].fs_mgr_flags & MS_RDONLY) != 0) { 521 fs_mgr_set_blk_ro(fstab->recs[i].blk_device); 522 } 523 continue; 524 } 525 526 /* Translate LABEL= file system labels into block devices */ 527 if (!strcmp(fstab->recs[i].fs_type, "ext2") || 528 !strcmp(fstab->recs[i].fs_type, "ext3") || 529 !strcmp(fstab->recs[i].fs_type, "ext4")) { 530 int tret = translate_ext_labels(&fstab->recs[i]); 531 if (tret < 0) { 532 ERROR("Could not translate label to block device\n"); 533 continue; 534 } 535 } 536 537 if (fstab->recs[i].fs_mgr_flags & MF_WAIT) { 538 wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT); 539 } 540 541 if ((fstab->recs[i].fs_mgr_flags & MF_VERIFY) && device_is_secure()) { 542 int rc = fs_mgr_setup_verity(&fstab->recs[i]); 543 if (device_is_debuggable() && rc == FS_MGR_SETUP_VERITY_DISABLED) { 544 INFO("Verity disabled"); 545 } else if (rc != FS_MGR_SETUP_VERITY_SUCCESS) { 546 ERROR("Could not set up verified partition, skipping!\n"); 547 continue; 548 } 549 } 550 int last_idx_inspected; 551 int top_idx = i; 552 553 mret = mount_with_alternatives(fstab, i, &last_idx_inspected, &attempted_idx); 554 i = last_idx_inspected; 555 mount_errno = errno; 556 557 /* Deal with encryptability. */ 558 if (!mret) { 559 int status = handle_encryptable(&fstab->recs[attempted_idx]); 560 561 if (status == FS_MGR_MNTALL_FAIL) { 562 /* Fatal error - no point continuing */ 563 return status; 564 } 565 566 if (status != FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE) { 567 if (encryptable != FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE) { 568 // Log and continue 569 ERROR("Only one encryptable/encrypted partition supported\n"); 570 } 571 encryptable = status; 572 } 573 574 /* Success! Go get the next one */ 575 continue; 576 } 577 578 /* mount(2) returned an error, handle the encryptable/formattable case */ 579 bool wiped = partition_wiped(fstab->recs[top_idx].blk_device); 580 if (mret && mount_errno != EBUSY && mount_errno != EACCES && 581 fs_mgr_is_formattable(&fstab->recs[top_idx]) && wiped) { 582 /* top_idx and attempted_idx point at the same partition, but sometimes 583 * at two different lines in the fstab. Use the top one for formatting 584 * as that is the preferred one. 585 */ 586 ERROR("%s(): %s is wiped and %s %s is formattable. Format it.\n", __func__, 587 fstab->recs[top_idx].blk_device, fstab->recs[top_idx].mount_point, 588 fstab->recs[top_idx].fs_type); 589 if (fs_mgr_is_encryptable(&fstab->recs[top_idx]) && 590 strcmp(fstab->recs[top_idx].key_loc, KEY_IN_FOOTER)) { 591 int fd = open(fstab->recs[top_idx].key_loc, O_WRONLY, 0644); 592 if (fd >= 0) { 593 INFO("%s(): also wipe %s\n", __func__, fstab->recs[top_idx].key_loc); 594 wipe_block_device(fd, get_file_size(fd)); 595 close(fd); 596 } else { 597 ERROR("%s(): %s wouldn't open (%s)\n", __func__, 598 fstab->recs[top_idx].key_loc, strerror(errno)); 599 } 600 } 601 if (fs_mgr_do_format(&fstab->recs[top_idx]) == 0) { 602 /* Let's replay the mount actions. */ 603 i = top_idx - 1; 604 continue; 605 } else { 606 ERROR("%s(): Format failed. Suggest recovery...\n", __func__); 607 encryptable = FS_MGR_MNTALL_DEV_NEEDS_RECOVERY; 608 continue; 609 } 610 } 611 if (mret && mount_errno != EBUSY && mount_errno != EACCES && 612 fs_mgr_is_encryptable(&fstab->recs[attempted_idx])) { 613 if (wiped) { 614 ERROR("%s(): %s is wiped and %s %s is encryptable. Suggest recovery...\n", __func__, 615 fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, 616 fstab->recs[attempted_idx].fs_type); 617 encryptable = FS_MGR_MNTALL_DEV_NEEDS_RECOVERY; 618 continue; 619 } else { 620 /* Need to mount a tmpfs at this mountpoint for now, and set 621 * properties that vold will query later for decrypting 622 */ 623 ERROR("%s(): possibly an encryptable blkdev %s for mount %s type %s )\n", __func__, 624 fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, 625 fstab->recs[attempted_idx].fs_type); 626 if (fs_mgr_do_tmpfs_mount(fstab->recs[attempted_idx].mount_point) < 0) { 627 ++error_count; 628 continue; 629 } 630 } 631 encryptable = FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED; 632 } else { 633 if (fs_mgr_is_nofail(&fstab->recs[attempted_idx])) { 634 ERROR("Ignoring failure to mount an un-encryptable or wiped partition on" 635 "%s at %s options: %s error: %s\n", 636 fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, 637 fstab->recs[attempted_idx].fs_options, strerror(mount_errno)); 638 } else { 639 ERROR("Failed to mount an un-encryptable or wiped partition on" 640 "%s at %s options: %s error: %s\n", 641 fstab->recs[attempted_idx].blk_device, fstab->recs[attempted_idx].mount_point, 642 fstab->recs[attempted_idx].fs_options, strerror(mount_errno)); 643 ++error_count; 644 } 645 continue; 646 } 647 } 648 649 if (error_count) { 650 return -1; 651 } else { 652 return encryptable; 653 } 654 } 655 656 /* If tmp_mount_point is non-null, mount the filesystem there. This is for the 657 * tmp mount we do to check the user password 658 * If multiple fstab entries are to be mounted on "n_name", it will try to mount each one 659 * in turn, and stop on 1st success, or no more match. 660 */ 661 int fs_mgr_do_mount(struct fstab *fstab, char *n_name, char *n_blk_device, 662 char *tmp_mount_point) 663 { 664 int i = 0; 665 int ret = FS_MGR_DOMNT_FAILED; 666 int mount_errors = 0; 667 int first_mount_errno = 0; 668 char *m; 669 670 if (!fstab) { 671 return ret; 672 } 673 674 for (i = 0; i < fstab->num_entries; i++) { 675 if (!fs_match(fstab->recs[i].mount_point, n_name)) { 676 continue; 677 } 678 679 /* We found our match */ 680 /* If this swap or a raw partition, report an error */ 681 if (!strcmp(fstab->recs[i].fs_type, "swap") || 682 !strcmp(fstab->recs[i].fs_type, "emmc") || 683 !strcmp(fstab->recs[i].fs_type, "mtd")) { 684 ERROR("Cannot mount filesystem of type %s on %s\n", 685 fstab->recs[i].fs_type, n_blk_device); 686 goto out; 687 } 688 689 /* First check the filesystem if requested */ 690 if (fstab->recs[i].fs_mgr_flags & MF_WAIT) { 691 wait_for_file(n_blk_device, WAIT_TIMEOUT); 692 } 693 694 if (fstab->recs[i].fs_mgr_flags & MF_CHECK) { 695 check_fs(n_blk_device, fstab->recs[i].fs_type, 696 fstab->recs[i].mount_point); 697 } 698 699 if ((fstab->recs[i].fs_mgr_flags & MF_VERIFY) && device_is_secure()) { 700 int rc = fs_mgr_setup_verity(&fstab->recs[i]); 701 if (device_is_debuggable() && rc == FS_MGR_SETUP_VERITY_DISABLED) { 702 INFO("Verity disabled"); 703 } else if (rc != FS_MGR_SETUP_VERITY_SUCCESS) { 704 ERROR("Could not set up verified partition, skipping!\n"); 705 continue; 706 } 707 } 708 709 /* Now mount it where requested */ 710 if (tmp_mount_point) { 711 m = tmp_mount_point; 712 } else { 713 m = fstab->recs[i].mount_point; 714 } 715 if (__mount(n_blk_device, m, &fstab->recs[i])) { 716 if (!first_mount_errno) first_mount_errno = errno; 717 mount_errors++; 718 continue; 719 } else { 720 ret = 0; 721 goto out; 722 } 723 } 724 if (mount_errors) { 725 ERROR("Cannot mount filesystem on %s at %s. error: %s\n", 726 n_blk_device, m, strerror(first_mount_errno)); 727 if (first_mount_errno == EBUSY) { 728 ret = FS_MGR_DOMNT_BUSY; 729 } else { 730 ret = FS_MGR_DOMNT_FAILED; 731 } 732 } else { 733 /* We didn't find a match, say so and return an error */ 734 ERROR("Cannot find mount point %s in fstab\n", fstab->recs[i].mount_point); 735 } 736 737 out: 738 return ret; 739 } 740 741 /* 742 * mount a tmpfs filesystem at the given point. 743 * return 0 on success, non-zero on failure. 744 */ 745 int fs_mgr_do_tmpfs_mount(char *n_name) 746 { 747 int ret; 748 749 ret = mount("tmpfs", n_name, "tmpfs", 750 MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS); 751 if (ret < 0) { 752 ERROR("Cannot mount tmpfs filesystem at %s\n", n_name); 753 return -1; 754 } 755 756 /* Success */ 757 return 0; 758 } 759 760 int fs_mgr_unmount_all(struct fstab *fstab) 761 { 762 int i = 0; 763 int ret = 0; 764 765 if (!fstab) { 766 return -1; 767 } 768 769 while (fstab->recs[i].blk_device) { 770 if (umount(fstab->recs[i].mount_point)) { 771 ERROR("Cannot unmount filesystem at %s\n", fstab->recs[i].mount_point); 772 ret = -1; 773 } 774 i++; 775 } 776 777 return ret; 778 } 779 780 /* This must be called after mount_all, because the mkswap command needs to be 781 * available. 782 */ 783 int fs_mgr_swapon_all(struct fstab *fstab) 784 { 785 int i = 0; 786 int flags = 0; 787 int err = 0; 788 int ret = 0; 789 int status; 790 char *mkswap_argv[2] = { 791 MKSWAP_BIN, 792 NULL 793 }; 794 795 if (!fstab) { 796 return -1; 797 } 798 799 for (i = 0; i < fstab->num_entries; i++) { 800 /* Skip non-swap entries */ 801 if (strcmp(fstab->recs[i].fs_type, "swap")) { 802 continue; 803 } 804 805 if (fstab->recs[i].zram_size > 0) { 806 /* A zram_size was specified, so we need to configure the 807 * device. There is no point in having multiple zram devices 808 * on a system (all the memory comes from the same pool) so 809 * we can assume the device number is 0. 810 */ 811 FILE *zram_fp; 812 813 zram_fp = fopen(ZRAM_CONF_DEV, "r+"); 814 if (zram_fp == NULL) { 815 ERROR("Unable to open zram conf device %s\n", ZRAM_CONF_DEV); 816 ret = -1; 817 continue; 818 } 819 fprintf(zram_fp, "%d\n", fstab->recs[i].zram_size); 820 fclose(zram_fp); 821 } 822 823 if (fstab->recs[i].fs_mgr_flags & MF_WAIT) { 824 wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT); 825 } 826 827 /* Initialize the swap area */ 828 mkswap_argv[1] = fstab->recs[i].blk_device; 829 err = android_fork_execvp_ext(ARRAY_SIZE(mkswap_argv), mkswap_argv, 830 &status, true, LOG_KLOG, false, NULL, 831 NULL, 0); 832 if (err) { 833 ERROR("mkswap failed for %s\n", fstab->recs[i].blk_device); 834 ret = -1; 835 continue; 836 } 837 838 /* If -1, then no priority was specified in fstab, so don't set 839 * SWAP_FLAG_PREFER or encode the priority */ 840 if (fstab->recs[i].swap_prio >= 0) { 841 flags = (fstab->recs[i].swap_prio << SWAP_FLAG_PRIO_SHIFT) & 842 SWAP_FLAG_PRIO_MASK; 843 flags |= SWAP_FLAG_PREFER; 844 } else { 845 flags = 0; 846 } 847 err = swapon(fstab->recs[i].blk_device, flags); 848 if (err) { 849 ERROR("swapon failed for %s\n", fstab->recs[i].blk_device); 850 ret = -1; 851 } 852 } 853 854 return ret; 855 } 856 857 /* 858 * key_loc must be at least PROPERTY_VALUE_MAX bytes long 859 * 860 * real_blk_device must be at least PROPERTY_VALUE_MAX bytes long 861 */ 862 int fs_mgr_get_crypt_info(struct fstab *fstab, char *key_loc, char *real_blk_device, int size) 863 { 864 int i = 0; 865 866 if (!fstab) { 867 return -1; 868 } 869 /* Initialize return values to null strings */ 870 if (key_loc) { 871 *key_loc = '\0'; 872 } 873 if (real_blk_device) { 874 *real_blk_device = '\0'; 875 } 876 877 /* Look for the encryptable partition to find the data */ 878 for (i = 0; i < fstab->num_entries; i++) { 879 /* Don't deal with vold managed enryptable partitions here */ 880 if (fstab->recs[i].fs_mgr_flags & MF_VOLDMANAGED) { 881 continue; 882 } 883 if (!(fstab->recs[i].fs_mgr_flags 884 & (MF_CRYPT | MF_FORCECRYPT | MF_FORCEFDEORFBE))) { 885 continue; 886 } 887 888 /* We found a match */ 889 if (key_loc) { 890 strlcpy(key_loc, fstab->recs[i].key_loc, size); 891 } 892 if (real_blk_device) { 893 strlcpy(real_blk_device, fstab->recs[i].blk_device, size); 894 } 895 break; 896 } 897 898 return 0; 899 } 900
