Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 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 | /* TO DO: |
| 18 | * 1. Re-direct fsck output to the kernel log? |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <unistd.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <ctype.h> |
| 28 | #include <sys/mount.h> |
| 29 | #include <sys/stat.h> |
| 30 | #include <errno.h> |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/wait.h> |
| 33 | #include <libgen.h> |
| 34 | #include <time.h> |
| 35 | |
| 36 | #include <private/android_filesystem_config.h> |
| 37 | #include <cutils/partition_utils.h> |
| 38 | #include <cutils/properties.h> |
| 39 | |
| 40 | #include "fs_mgr_priv.h" |
| 41 | |
| 42 | #define KEY_LOC_PROP "ro.crypto.keyfile.userdata" |
| 43 | #define KEY_IN_FOOTER "footer" |
| 44 | |
| 45 | #define E2FSCK_BIN "/system/bin/e2fsck" |
| 46 | |
| 47 | struct flag_list { |
| 48 | const char *name; |
| 49 | unsigned flag; |
| 50 | }; |
| 51 | |
| 52 | static struct flag_list mount_flags[] = { |
| 53 | { "noatime", MS_NOATIME }, |
| 54 | { "noexec", MS_NOEXEC }, |
| 55 | { "nosuid", MS_NOSUID }, |
| 56 | { "nodev", MS_NODEV }, |
| 57 | { "nodiratime", MS_NODIRATIME }, |
| 58 | { "ro", MS_RDONLY }, |
| 59 | { "rw", 0 }, |
| 60 | { "remount", MS_REMOUNT }, |
Jeff Sharkey | e50ac5f | 2012-08-14 11:34:34 -0700 | [diff] [blame] | 61 | { "bind", MS_BIND }, |
| 62 | { "rec", MS_REC }, |
| 63 | { "unbindable", MS_UNBINDABLE }, |
| 64 | { "private", MS_PRIVATE }, |
| 65 | { "slave", MS_SLAVE }, |
| 66 | { "shared", MS_SHARED }, |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 67 | { "defaults", 0 }, |
| 68 | { 0, 0 }, |
| 69 | }; |
| 70 | |
| 71 | static struct flag_list fs_mgr_flags[] = { |
| 72 | { "wait", MF_WAIT }, |
| 73 | { "check", MF_CHECK }, |
| 74 | { "encryptable=",MF_CRYPT }, |
| 75 | { "defaults", 0 }, |
| 76 | { 0, 0 }, |
| 77 | }; |
| 78 | |
| 79 | /* |
| 80 | * gettime() - returns the time in seconds of the system's monotonic clock or |
| 81 | * zero on error. |
| 82 | */ |
| 83 | static time_t gettime(void) |
| 84 | { |
| 85 | struct timespec ts; |
| 86 | int ret; |
| 87 | |
| 88 | ret = clock_gettime(CLOCK_MONOTONIC, &ts); |
| 89 | if (ret < 0) { |
| 90 | ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno)); |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | return ts.tv_sec; |
| 95 | } |
| 96 | |
| 97 | static int wait_for_file(const char *filename, int timeout) |
| 98 | { |
| 99 | struct stat info; |
| 100 | time_t timeout_time = gettime() + timeout; |
| 101 | int ret = -1; |
| 102 | |
| 103 | while (gettime() < timeout_time && ((ret = stat(filename, &info)) < 0)) |
| 104 | usleep(10000); |
| 105 | |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | static int parse_flags(char *flags, struct flag_list *fl, char **key_loc, |
| 110 | char *fs_options, int fs_options_len) |
| 111 | { |
| 112 | int f = 0; |
| 113 | int i; |
| 114 | char *p; |
| 115 | char *savep; |
| 116 | |
| 117 | /* initialize key_loc to null, if we find an MF_CRYPT flag, |
| 118 | * then we'll set key_loc to the proper value */ |
| 119 | if (key_loc) { |
| 120 | *key_loc = NULL; |
| 121 | } |
| 122 | /* initialize fs_options to the null string */ |
| 123 | if (fs_options && (fs_options_len > 0)) { |
| 124 | fs_options[0] = '\0'; |
| 125 | } |
| 126 | |
| 127 | p = strtok_r(flags, ",", &savep); |
| 128 | while (p) { |
| 129 | /* Look for the flag "p" in the flag list "fl" |
| 130 | * If not found, the loop exits with fl[i].name being null. |
| 131 | */ |
| 132 | for (i = 0; fl[i].name; i++) { |
| 133 | if (!strncmp(p, fl[i].name, strlen(fl[i].name))) { |
| 134 | f |= fl[i].flag; |
| 135 | if ((fl[i].flag == MF_CRYPT) && key_loc) { |
| 136 | /* The encryptable flag is followed by an = and the |
| 137 | * location of the keys. Get it and return it. |
| 138 | */ |
| 139 | *key_loc = strdup(strchr(p, '=') + 1); |
| 140 | } |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | if (!fl[i].name) { |
| 146 | if (fs_options) { |
| 147 | /* It's not a known flag, so it must be a filesystem specific |
| 148 | * option. Add it to fs_options if it was passed in. |
| 149 | */ |
| 150 | strlcat(fs_options, p, fs_options_len); |
| 151 | strlcat(fs_options, ",", fs_options_len); |
| 152 | } else { |
| 153 | /* fs_options was not passed in, so if the flag is unknown |
| 154 | * it's an error. |
| 155 | */ |
| 156 | ERROR("Warning: unknown flag %s\n", p); |
| 157 | } |
| 158 | } |
| 159 | p = strtok_r(NULL, ",", &savep); |
| 160 | } |
| 161 | |
| 162 | out: |
| 163 | if (fs_options && fs_options[0]) { |
| 164 | /* remove the last trailing comma from the list of options */ |
| 165 | fs_options[strlen(fs_options) - 1] = '\0'; |
| 166 | } |
| 167 | |
| 168 | return f; |
| 169 | } |
| 170 | |
| 171 | /* Read a line of text till the next newline character. |
| 172 | * If no newline is found before the buffer is full, continue reading till a new line is seen, |
| 173 | * then return an empty buffer. This effectively ignores lines that are too long. |
| 174 | * On EOF, return null. |
| 175 | */ |
Irina Tirdea | 295b82b | 2012-08-27 19:10:57 +0300 | [diff] [blame] | 176 | static char *fs_getline(char *buf, int size, FILE *file) |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 177 | { |
| 178 | int cnt = 0; |
| 179 | int eof = 0; |
| 180 | int eol = 0; |
| 181 | int c; |
| 182 | |
| 183 | if (size < 1) { |
| 184 | return NULL; |
| 185 | } |
| 186 | |
| 187 | while (cnt < (size - 1)) { |
| 188 | c = getc(file); |
| 189 | if (c == EOF) { |
| 190 | eof = 1; |
| 191 | break; |
| 192 | } |
| 193 | |
| 194 | *(buf + cnt) = c; |
| 195 | cnt++; |
| 196 | |
| 197 | if (c == '\n') { |
| 198 | eol = 1; |
| 199 | break; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /* Null terminate what we've read */ |
| 204 | *(buf + cnt) = '\0'; |
| 205 | |
| 206 | if (eof) { |
| 207 | if (cnt) { |
| 208 | return buf; |
| 209 | } else { |
| 210 | return NULL; |
| 211 | } |
| 212 | } else if (eol) { |
| 213 | return buf; |
| 214 | } else { |
| 215 | /* The line is too long. Read till a newline or EOF. |
| 216 | * If EOF, return null, if newline, return an empty buffer. |
| 217 | */ |
| 218 | while(1) { |
| 219 | c = getc(file); |
| 220 | if (c == EOF) { |
| 221 | return NULL; |
| 222 | } else if (c == '\n') { |
| 223 | *buf = '\0'; |
| 224 | return buf; |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | static struct fstab_rec *read_fstab(char *fstab_path) |
| 231 | { |
| 232 | FILE *fstab_file; |
| 233 | int cnt, entries; |
| 234 | int len; |
| 235 | char line[256]; |
| 236 | const char *delim = " \t"; |
| 237 | char *save_ptr, *p; |
| 238 | struct fstab_rec *fstab; |
| 239 | char *key_loc; |
| 240 | #define FS_OPTIONS_LEN 1024 |
| 241 | char tmp_fs_options[FS_OPTIONS_LEN]; |
| 242 | |
| 243 | fstab_file = fopen(fstab_path, "r"); |
| 244 | if (!fstab_file) { |
| 245 | ERROR("Cannot open file %s\n", fstab_path); |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | entries = 0; |
Irina Tirdea | 295b82b | 2012-08-27 19:10:57 +0300 | [diff] [blame] | 250 | while (fs_getline(line, sizeof(line), fstab_file)) { |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 251 | /* if the last character is a newline, shorten the string by 1 byte */ |
| 252 | len = strlen(line); |
| 253 | if (line[len - 1] == '\n') { |
| 254 | line[len - 1] = '\0'; |
| 255 | } |
| 256 | /* Skip any leading whitespace */ |
| 257 | p = line; |
| 258 | while (isspace(*p)) { |
| 259 | p++; |
| 260 | } |
| 261 | /* ignore comments or empty lines */ |
| 262 | if (*p == '#' || *p == '\0') |
| 263 | continue; |
| 264 | entries++; |
| 265 | } |
| 266 | |
| 267 | if (!entries) { |
| 268 | ERROR("No entries found in fstab\n"); |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | fstab = calloc(entries + 1, sizeof(struct fstab_rec)); |
| 273 | |
| 274 | fseek(fstab_file, 0, SEEK_SET); |
| 275 | |
| 276 | cnt = 0; |
Irina Tirdea | 295b82b | 2012-08-27 19:10:57 +0300 | [diff] [blame] | 277 | while (fs_getline(line, sizeof(line), fstab_file)) { |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 278 | /* if the last character is a newline, shorten the string by 1 byte */ |
| 279 | len = strlen(line); |
| 280 | if (line[len - 1] == '\n') { |
| 281 | line[len - 1] = '\0'; |
| 282 | } |
| 283 | |
| 284 | /* Skip any leading whitespace */ |
| 285 | p = line; |
| 286 | while (isspace(*p)) { |
| 287 | p++; |
| 288 | } |
| 289 | /* ignore comments or empty lines */ |
| 290 | if (*p == '#' || *p == '\0') |
| 291 | continue; |
| 292 | |
| 293 | /* If a non-comment entry is greater than the size we allocated, give an |
| 294 | * error and quit. This can happen in the unlikely case the file changes |
| 295 | * between the two reads. |
| 296 | */ |
| 297 | if (cnt >= entries) { |
| 298 | ERROR("Tried to process more entries than counted\n"); |
| 299 | break; |
| 300 | } |
| 301 | |
| 302 | if (!(p = strtok_r(line, delim, &save_ptr))) { |
| 303 | ERROR("Error parsing mount source\n"); |
| 304 | return 0; |
| 305 | } |
| 306 | fstab[cnt].blk_dev = strdup(p); |
| 307 | |
| 308 | if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| 309 | ERROR("Error parsing mnt_point\n"); |
| 310 | return 0; |
| 311 | } |
| 312 | fstab[cnt].mnt_point = strdup(p); |
| 313 | |
| 314 | if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| 315 | ERROR("Error parsing fs_type\n"); |
| 316 | return 0; |
| 317 | } |
| 318 | fstab[cnt].type = strdup(p); |
| 319 | |
| 320 | if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| 321 | ERROR("Error parsing mount_flags\n"); |
| 322 | return 0; |
| 323 | } |
| 324 | tmp_fs_options[0] = '\0'; |
| 325 | fstab[cnt].flags = parse_flags(p, mount_flags, 0, tmp_fs_options, FS_OPTIONS_LEN); |
| 326 | |
| 327 | /* fs_options are optional */ |
| 328 | if (tmp_fs_options[0]) { |
| 329 | fstab[cnt].fs_options = strdup(tmp_fs_options); |
| 330 | } else { |
| 331 | fstab[cnt].fs_options = NULL; |
| 332 | } |
| 333 | |
| 334 | if (!(p = strtok_r(NULL, delim, &save_ptr))) { |
| 335 | ERROR("Error parsing fs_mgr_options\n"); |
| 336 | return 0; |
| 337 | } |
| 338 | fstab[cnt].fs_mgr_flags = parse_flags(p, fs_mgr_flags, &key_loc, 0, 0); |
| 339 | fstab[cnt].key_loc = key_loc; |
| 340 | |
| 341 | cnt++; |
| 342 | } |
| 343 | fclose(fstab_file); |
| 344 | |
| 345 | return fstab; |
| 346 | } |
| 347 | |
| 348 | static void free_fstab(struct fstab_rec *fstab) |
| 349 | { |
| 350 | int i = 0; |
| 351 | |
| 352 | while (fstab[i].blk_dev) { |
| 353 | /* Free the pointers return by strdup(3) */ |
| 354 | free(fstab[i].blk_dev); |
| 355 | free(fstab[i].mnt_point); |
| 356 | free(fstab[i].type); |
| 357 | free(fstab[i].fs_options); |
| 358 | free(fstab[i].key_loc); |
| 359 | |
| 360 | i++; |
| 361 | } |
| 362 | |
| 363 | /* Free the actual fstab array created by calloc(3) */ |
| 364 | free(fstab); |
| 365 | } |
| 366 | |
Ken Sumrall | 5dc5bfe | 2012-07-23 19:34:00 -0700 | [diff] [blame] | 367 | static void check_fs(char *blk_dev, char *type, char *target) |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 368 | { |
| 369 | pid_t pid; |
| 370 | int status; |
Ken Sumrall | 5dc5bfe | 2012-07-23 19:34:00 -0700 | [diff] [blame] | 371 | int ret; |
| 372 | long tmpmnt_flags = MS_NOATIME | MS_NOEXEC | MS_NOSUID; |
| 373 | char *tmpmnt_opts = "nomblk_io_submit,errors=remount-ro"; |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 374 | |
| 375 | /* Check for the types of filesystems we know how to check */ |
| 376 | if (!strcmp(type, "ext2") || !strcmp(type, "ext3") || !strcmp(type, "ext4")) { |
Ken Sumrall | 5dc5bfe | 2012-07-23 19:34:00 -0700 | [diff] [blame] | 377 | /* |
| 378 | * First try to mount and unmount the filesystem. We do this because |
| 379 | * the kernel is more efficient than e2fsck in running the journal and |
| 380 | * processing orphaned inodes, and on at least one device with a |
| 381 | * performance issue in the emmc firmware, it can take e2fsck 2.5 minutes |
| 382 | * to do what the kernel does in about a second. |
| 383 | * |
| 384 | * After mounting and unmounting the filesystem, run e2fsck, and if an |
| 385 | * error is recorded in the filesystem superblock, e2fsck will do a full |
| 386 | * check. Otherwise, it does nothing. If the kernel cannot mount the |
| 387 | * filesytsem due to an error, e2fsck is still run to do a full check |
| 388 | * fix the filesystem. |
| 389 | */ |
| 390 | ret = mount(blk_dev, target, type, tmpmnt_flags, tmpmnt_opts); |
| 391 | if (! ret) { |
| 392 | umount(target); |
| 393 | } |
| 394 | |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 395 | INFO("Running %s on %s\n", E2FSCK_BIN, blk_dev); |
| 396 | pid = fork(); |
| 397 | if (pid > 0) { |
| 398 | /* Parent, wait for the child to return */ |
| 399 | waitpid(pid, &status, 0); |
| 400 | } else if (pid == 0) { |
| 401 | /* child, run checker */ |
| 402 | execlp(E2FSCK_BIN, E2FSCK_BIN, "-y", blk_dev, (char *)NULL); |
| 403 | |
| 404 | /* Only gets here on error */ |
| 405 | ERROR("Cannot run fs_mgr binary %s\n", E2FSCK_BIN); |
| 406 | } else { |
| 407 | /* No need to check for error in fork, we can't really handle it now */ |
| 408 | ERROR("Fork failed trying to run %s\n", E2FSCK_BIN); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | static void remove_trailing_slashes(char *n) |
| 416 | { |
| 417 | int len; |
| 418 | |
| 419 | len = strlen(n) - 1; |
| 420 | while ((*(n + len) == '/') && len) { |
| 421 | *(n + len) = '\0'; |
| 422 | len--; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | static int fs_match(char *in1, char *in2) |
| 427 | { |
| 428 | char *n1; |
| 429 | char *n2; |
| 430 | int ret; |
| 431 | |
| 432 | n1 = strdup(in1); |
| 433 | n2 = strdup(in2); |
| 434 | |
| 435 | remove_trailing_slashes(n1); |
| 436 | remove_trailing_slashes(n2); |
| 437 | |
| 438 | ret = !strcmp(n1, n2); |
| 439 | |
| 440 | free(n1); |
| 441 | free(n2); |
| 442 | |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | int fs_mgr_mount_all(char *fstab_file) |
| 447 | { |
| 448 | int i = 0; |
| 449 | int encrypted = 0; |
| 450 | int ret = -1; |
| 451 | int mret; |
| 452 | struct fstab_rec *fstab = 0; |
| 453 | |
| 454 | if (!(fstab = read_fstab(fstab_file))) { |
| 455 | return ret; |
| 456 | } |
| 457 | |
| 458 | for (i = 0; fstab[i].blk_dev; i++) { |
| 459 | if (fstab[i].fs_mgr_flags & MF_WAIT) { |
| 460 | wait_for_file(fstab[i].blk_dev, WAIT_TIMEOUT); |
| 461 | } |
| 462 | |
| 463 | if (fstab[i].fs_mgr_flags & MF_CHECK) { |
Ken Sumrall | 5dc5bfe | 2012-07-23 19:34:00 -0700 | [diff] [blame] | 464 | check_fs(fstab[i].blk_dev, fstab[i].type, fstab[i].mnt_point); |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | mret = mount(fstab[i].blk_dev, fstab[i].mnt_point, fstab[i].type, |
| 468 | fstab[i].flags, fstab[i].fs_options); |
| 469 | if (!mret) { |
| 470 | /* Success! Go get the next one */ |
| 471 | continue; |
| 472 | } |
| 473 | |
| 474 | /* mount(2) returned an error, check if it's encrypted and deal with it */ |
| 475 | if ((fstab[i].fs_mgr_flags & MF_CRYPT) && !partition_wiped(fstab[i].blk_dev)) { |
| 476 | /* Need to mount a tmpfs at this mountpoint for now, and set |
| 477 | * properties that vold will query later for decrypting |
| 478 | */ |
| 479 | if (mount("tmpfs", fstab[i].mnt_point, "tmpfs", |
| 480 | MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS) < 0) { |
| 481 | ERROR("Cannot mount tmpfs filesystem for encrypted fs at %s\n", |
| 482 | fstab[i].mnt_point); |
| 483 | goto out; |
| 484 | } |
| 485 | encrypted = 1; |
| 486 | } else { |
| 487 | ERROR("Cannot mount filesystem on %s at %s\n", |
| 488 | fstab[i].blk_dev, fstab[i].mnt_point); |
| 489 | goto out; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | if (encrypted) { |
| 494 | ret = 1; |
| 495 | } else { |
| 496 | ret = 0; |
| 497 | } |
| 498 | |
| 499 | out: |
| 500 | free_fstab(fstab); |
| 501 | return ret; |
| 502 | } |
| 503 | |
| 504 | /* If tmp_mnt_point is non-null, mount the filesystem there. This is for the |
| 505 | * tmp mount we do to check the user password |
| 506 | */ |
| 507 | int fs_mgr_do_mount(char *fstab_file, char *n_name, char *n_blk_dev, char *tmp_mnt_point) |
| 508 | { |
| 509 | int i = 0; |
| 510 | int ret = -1; |
| 511 | struct fstab_rec *fstab = 0; |
| 512 | char *m; |
| 513 | |
| 514 | if (!(fstab = read_fstab(fstab_file))) { |
| 515 | return ret; |
| 516 | } |
| 517 | |
| 518 | for (i = 0; fstab[i].blk_dev; i++) { |
| 519 | if (!fs_match(fstab[i].mnt_point, n_name)) { |
| 520 | continue; |
| 521 | } |
| 522 | |
| 523 | /* We found our match */ |
| 524 | /* First check the filesystem if requested */ |
| 525 | if (fstab[i].fs_mgr_flags & MF_WAIT) { |
Ken Sumrall | d42d327 | 2012-11-06 17:55:37 -0800 | [diff] [blame] | 526 | wait_for_file(n_blk_dev, WAIT_TIMEOUT); |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | if (fstab[i].fs_mgr_flags & MF_CHECK) { |
Ken Sumrall | d42d327 | 2012-11-06 17:55:37 -0800 | [diff] [blame] | 530 | check_fs(n_blk_dev, fstab[i].type, fstab[i].mnt_point); |
Ken Sumrall | c1bf896 | 2012-01-06 19:09:42 -0800 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | /* Now mount it where requested */ |
| 534 | if (tmp_mnt_point) { |
| 535 | m = tmp_mnt_point; |
| 536 | } else { |
| 537 | m = fstab[i].mnt_point; |
| 538 | } |
| 539 | if (mount(n_blk_dev, m, fstab[i].type, |
| 540 | fstab[i].flags, fstab[i].fs_options)) { |
| 541 | ERROR("Cannot mount filesystem on %s at %s\n", |
| 542 | n_blk_dev, m); |
| 543 | goto out; |
| 544 | } else { |
| 545 | ret = 0; |
| 546 | goto out; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | /* We didn't find a match, say so and return an error */ |
| 551 | ERROR("Cannot find mount point %s in fstab\n", fstab[i].mnt_point); |
| 552 | |
| 553 | out: |
| 554 | free_fstab(fstab); |
| 555 | return ret; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * mount a tmpfs filesystem at the given point. |
| 560 | * return 0 on success, non-zero on failure. |
| 561 | */ |
| 562 | int fs_mgr_do_tmpfs_mount(char *n_name) |
| 563 | { |
| 564 | int ret; |
| 565 | |
| 566 | ret = mount("tmpfs", n_name, "tmpfs", |
| 567 | MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS); |
| 568 | if (ret < 0) { |
| 569 | ERROR("Cannot mount tmpfs filesystem at %s\n", n_name); |
| 570 | return -1; |
| 571 | } |
| 572 | |
| 573 | /* Success */ |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | int fs_mgr_unmount_all(char *fstab_file) |
| 578 | { |
| 579 | int i = 0; |
| 580 | int ret = 0; |
| 581 | struct fstab_rec *fstab = 0; |
| 582 | |
| 583 | if (!(fstab = read_fstab(fstab_file))) { |
| 584 | return -1; |
| 585 | } |
| 586 | |
| 587 | while (fstab[i].blk_dev) { |
| 588 | if (umount(fstab[i].mnt_point)) { |
| 589 | ERROR("Cannot unmount filesystem at %s\n", fstab[i].mnt_point); |
| 590 | ret = -1; |
| 591 | } |
| 592 | i++; |
| 593 | } |
| 594 | |
| 595 | free_fstab(fstab); |
| 596 | return ret; |
| 597 | } |
| 598 | /* |
| 599 | * key_loc must be at least PROPERTY_VALUE_MAX bytes long |
| 600 | * |
| 601 | * real_blk_dev must be at least PROPERTY_VALUE_MAX bytes long |
| 602 | */ |
| 603 | int fs_mgr_get_crypt_info(char *fstab_file, char *key_loc, char *real_blk_dev, int size) |
| 604 | { |
| 605 | int i = 0; |
| 606 | struct fstab_rec *fstab = 0; |
| 607 | |
| 608 | if (!(fstab = read_fstab(fstab_file))) { |
| 609 | return -1; |
| 610 | } |
| 611 | /* Initialize return values to null strings */ |
| 612 | if (key_loc) { |
| 613 | *key_loc = '\0'; |
| 614 | } |
| 615 | if (real_blk_dev) { |
| 616 | *real_blk_dev = '\0'; |
| 617 | } |
| 618 | |
| 619 | /* Look for the encryptable partition to find the data */ |
| 620 | for (i = 0; fstab[i].blk_dev; i++) { |
| 621 | if (!(fstab[i].fs_mgr_flags & MF_CRYPT)) { |
| 622 | continue; |
| 623 | } |
| 624 | |
| 625 | /* We found a match */ |
| 626 | if (key_loc) { |
| 627 | strlcpy(key_loc, fstab[i].key_loc, size); |
| 628 | } |
| 629 | if (real_blk_dev) { |
| 630 | strlcpy(real_blk_dev, fstab[i].blk_dev, size); |
| 631 | } |
| 632 | break; |
| 633 | } |
| 634 | |
| 635 | free_fstab(fstab); |
| 636 | return 0; |
| 637 | } |
| 638 | |