| | 1 | /* |
| | 2 | * SPDX-License-Identifier: GPL-2.0-or-later |
| | 3 | * |
| | 4 | * cramfsck - check a cramfs file system |
| | 5 | * |
| | 6 | * Copyright (C) 2000-2002 Transmeta Corporation |
| | 7 | * 2005 Adrian Bunk |
| | 8 | * |
| | 9 | * This program is free software; you can redistribute it and/or modify |
| | 10 | * it under the terms of the GNU General Public License as published by |
| | 11 | * the Free Software Foundation; either version 2 of the License, or |
| | 12 | * (at your option) any later version. |
| | 13 | * |
| | 14 | * This program is distributed in the hope that it will be useful, |
| | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 17 | * GNU General Public License for more details. |
| | 18 | * |
| | 19 | * You should have received a copy of the GNU General Public License |
| | 20 | * along with this program. If not, see <https://gnu.org/licenses/>. |
| | 21 | * |
| | 22 | * 1999/12/03: Linus Torvalds (cramfs tester and unarchive program) |
| | 23 | * 2000/06/03: Daniel Quinlan (CRC and length checking program) |
| | 24 | * 2000/06/04: Daniel Quinlan (merged programs, added options, support |
| | 25 | * for special files, preserve permissions and |
| | 26 | * ownership, cramfs superblock v2, bogus mode |
| | 27 | * test, pathname length test, etc.) |
| | 28 | * 2000/06/06: Daniel Quinlan (support for holes, pretty-printing, |
| | 29 | * symlink size test) |
| | 30 | * 2000/07/11: Daniel Quinlan (file length tests, start at offset 0 or 512, |
| | 31 | * fsck-compatible exit codes) |
| | 32 | * 2000/07/15: Daniel Quinlan (initial support for block devices) |
| | 33 | * 2002/01/10: Daniel Quinlan (additional checks, test more return codes, |
| | 34 | * use read if mmap fails, standardize messages) |
| | 35 | */ |
| | 36 | |
| | 37 | #include <stdio.h> |
| | 38 | #include <stdarg.h> |
| | 39 | #include <stdint.h> |
| | 40 | #include <unistd.h> |
| | 41 | #include <dirent.h> |
| | 42 | #include <stdlib.h> |
| | 43 | #include <errno.h> |
| | 44 | #include <string.h> |
| | 45 | #include <getopt.h> |
| | 46 | #include <fcntl.h> |
| | 47 | |
| | 48 | /* We don't use our include/crc32.h, but crc32 from zlib! |
| | 49 | * |
| | 50 | * The zlib implementation performs pre/post-conditioning. The util-linux |
| | 51 | * imlemenation requires post-conditioning (xor) in the applications. |
| | 52 | */ |
| | 53 | #include <zlib.h> |
| | 54 | |
| | 55 | #include <sys/time.h> |
| | 56 | #include <sys/types.h> |
| | 57 | #include <sys/stat.h> |
| | 58 | #include <sys/mman.h> |
| | 59 | |
| | 60 | #include "c.h" |
| | 61 | #include "cramfs.h" |
| | 62 | #include "nls.h" |
| | 63 | #include "blkdev.h" |
| | 64 | #include "exitcodes.h" |
| | 65 | #include "strutils.h" |
| | 66 | #include "closestream.h" |
| | 67 | |
| | 68 | #define XALLOC_EXIT_CODE FSCK_EX_ERROR |
| | 69 | #include "xalloc.h" |
| | 70 | |
| | 71 | static int fd; /* ROM image file descriptor */ |
| | 72 | static char *filename; /* ROM image filename */ |
| | 73 | static struct cramfs_super super; /* just find the cramfs superblock once */ |
| | 74 | static int cramfs_is_big_endian = 0; /* source is big endian */ |
| | 75 | static int opt_verbose = 0; /* 1 = verbose (-v), 2+ = very verbose (-vv) */ |
| | 76 | static int opt_extract = 0; /* extract cramfs (-x) */ |
| | 77 | static char *extract_dir = ""; /* optional extraction directory (-x) */ |
| | 78 | |
| | 79 | #define PAD_SIZE 512 |
| | 80 | |
| | 81 | static uid_t euid; /* effective UID */ |
| | 82 | |
| | 83 | /* (cramfs_super + start) <= start_dir < end_dir <= start_data <= end_data */ |
| | 84 | static unsigned long start_dir = ~0UL; /* start of first non-root inode */ |
| | 85 | static unsigned long end_dir = 0; /* end of the directory structure */ |
| | 86 | static unsigned long start_data = ~0UL; /* start of the data (256 MB = max) */ |
| | 87 | static unsigned long end_data = 0; /* end of the data */ |
| | 88 | |
| | 89 | |
| | 90 | /* Guarantee access to at least 2 * blksize at a time */ |
| | 91 | #define CRAMFS_ROMBUFFER_BITS 13 |
| | 92 | #define CRAMFS_ROMBUFFERSIZE (1 << CRAMFS_ROMBUFFER_BITS) |
| | 93 | #define CRAMFS_ROMBUFFERMASK (CRAMFS_ROMBUFFERSIZE - 1) |
| | 94 | |
| | 95 | /* Defaults, updated in main() according to block size */ |
| | 96 | static size_t rombufbits = CRAMFS_ROMBUFFER_BITS; |
| | 97 | static size_t rombufsize = CRAMFS_ROMBUFFERSIZE; |
| | 98 | static size_t rombufmask = CRAMFS_ROMBUFFERMASK; |
| | 99 | |
| | 100 | static char *read_buffer; |
| | 101 | static unsigned long read_buffer_block = ~0UL; |
| | 102 | |
| | 103 | static z_stream stream; |
| | 104 | |
| | 105 | /* Prototypes */ |
| | 106 | static void expand_fs(char *, struct cramfs_inode *); |
| | 107 | |
| | 108 | static char *outbuffer; |
| | 109 | |
| | 110 | static size_t blksize = 0; |
| | 111 | |
| | 112 | static void __attribute__((__noreturn__)) usage(void) |
| | 113 | { |
| | 114 | FILE *out = stdout; |
| | 115 | |
| | 116 | fputs(USAGE_HEADER, out); |
| | 117 | fprintf(out, |
| | 118 | _(" %s [options] <file>\n"), program_invocation_short_name); |
| | 119 | |
| | 120 | fputs(USAGE_SEPARATOR, out); |
| | 121 | fputs(_("Check and repair a compressed ROM filesystem.\n"), out); |
| | 122 | |
| | 123 | fputs(USAGE_OPTIONS, out); |
| | 124 | fputs(_(" -a for compatibility only, ignored\n"), out); |
| | 125 | fputs(_(" -v, --verbose be more verbose\n"), out); |
| | 126 | fputs(_(" -y for compatibility only, ignored\n"), out); |
| | 127 | fputs(_(" -b, --blocksize <size> use this blocksize, defaults to page size\n"), out); |
| | 128 | fputs(_(" --extract[=<dir>] test uncompression, optionally extract into <dir>\n"), out); |
| | 129 | fputs(USAGE_SEPARATOR, out); |
| | 130 | fprintf(out, USAGE_HELP_OPTIONS(26)); |
| | 131 | |
| | 132 | fprintf(out, USAGE_MAN_TAIL("fsck.cramfs(8)")); |
| | 133 | exit(FSCK_EX_OK); |
| | 134 | } |
| | 135 | |
| | 136 | static int get_superblock_endianness(uint32_t magic) |
| | 137 | { |
| | 138 | if (magic == CRAMFS_MAGIC) { |
| | 139 | cramfs_is_big_endian = HOST_IS_BIG_ENDIAN; |
| | 140 | return 0; |
| | 141 | } |
| | 142 | |
| | 143 | if (magic == |
| | 144 | u32_toggle_endianness(!HOST_IS_BIG_ENDIAN, CRAMFS_MAGIC)) { |
| | 145 | cramfs_is_big_endian = !HOST_IS_BIG_ENDIAN; |
| | 146 | return 0; |
| | 147 | } |
| | 148 | |
| | 149 | return -1; |
| | 150 | } |
| | 151 | |
| | 152 | static void test_super(int *start) |
| | 153 | { |
| | 154 | struct stat st; |
| | 155 | unsigned long long length; |
| | 156 | |
| | 157 | fd = open(filename, O_RDONLY); |
| | 158 | if (fd < 0) |
| | 159 | err(FSCK_EX_ERROR, _("cannot open %s"), filename); |
| | 160 | |
| | 161 | /* find the physical size of the file or block device */ |
| | 162 | if (fstat(fd, &st) < 0) |
| | 163 | err(FSCK_EX_ERROR, _("stat of %s failed"), filename); |
| | 164 | |
| | 165 | if (S_ISBLK(st.st_mode)) { |
| | 166 | if (blkdev_get_size(fd, &length)) |
| | 167 | err(FSCK_EX_ERROR, |
| | 168 | _("ioctl failed: unable to determine device size: %s"), |
| | 169 | filename); |
| | 170 | } else if (S_ISREG(st.st_mode)) |
| | 171 | length = st.st_size; |
| | 172 | else |
| | 173 | errx(FSCK_EX_ERROR, _("not a block device or file: %s"), filename); |
| | 174 | |
| | 175 | if (length < sizeof(struct cramfs_super)) |
| | 176 | errx(FSCK_EX_UNCORRECTED, _("file length too short")); |
| | 177 | |
| | 178 | /* find superblock */ |
| | 179 | if (read(fd, &super, sizeof(super)) != sizeof(super)) |
| | 180 | err(FSCK_EX_ERROR, _("cannot read %s"), filename); |
| | 181 | if (get_superblock_endianness(super.magic) != -1) |
| | 182 | *start = 0; |
| | 183 | else if (length >= (PAD_SIZE + sizeof(super))) { |
| | 184 | if (lseek(fd, PAD_SIZE, SEEK_SET) == (off_t) -1) |
| | 185 | err(FSCK_EX_ERROR, _("seek on %s failed"), filename); |
| | 186 | if (read(fd, &super, sizeof(super)) != sizeof(super)) |
| | 187 | err(FSCK_EX_ERROR, _("cannot read %s"), filename); |
| | 188 | if (get_superblock_endianness(super.magic) != -1) |
| | 189 | *start = PAD_SIZE; |
| | 190 | else |
| | 191 | errx(FSCK_EX_UNCORRECTED, _("superblock magic not found")); |
| | 192 | } else |
| | 193 | errx(FSCK_EX_UNCORRECTED, _("superblock magic not found")); |
| | 194 | |
| | 195 | if (opt_verbose) |
| | 196 | printf(_("cramfs endianness is %s\n"), |
| | 197 | cramfs_is_big_endian ? _("big") : _("little")); |
| | 198 | |
| | 199 | super_toggle_endianness(cramfs_is_big_endian, &super); |
| | 200 | if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) |
| | 201 | errx(FSCK_EX_ERROR, _("unsupported filesystem features")); |
| | 202 | |
| | 203 | /* What are valid superblock sizes? */ |
| | 204 | if (super.size < *start + sizeof(struct cramfs_super)) |
| | 205 | errx(FSCK_EX_UNCORRECTED, _("superblock size (%d) too small"), |
| | 206 | super.size); |
| | 207 | |
| | 208 | if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) { |
| | 209 | if (super.fsid.files == 0) |
| | 210 | errx(FSCK_EX_UNCORRECTED, _("zero file count")); |
| | 211 | if (length < super.size) |
| | 212 | errx(FSCK_EX_UNCORRECTED, _("file length too short")); |
| | 213 | else if (length > super.size) |
| | 214 | warnx(_("file extends past end of filesystem")); |
| | 215 | } else |
| | 216 | warnx(_("old cramfs format")); |
| | 217 | } |
| | 218 | |
| | 219 | static void test_crc(int start) |
| | 220 | { |
| | 221 | void *buf; |
| | 222 | uint32_t crc; |
| | 223 | |
| | 224 | if (!(super.flags & CRAMFS_FLAG_FSID_VERSION_2)) { |
| | 225 | warnx(_("unable to test CRC: old cramfs format")); |
| | 226 | return; |
| | 227 | } |
| | 228 | |
| | 229 | crc = crc32(0L, NULL, 0); |
| | 230 | |
| | 231 | buf = |
| | 232 | mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); |
| | 233 | if (buf == MAP_FAILED) { |
| | 234 | buf = |
| | 235 | mmap(NULL, super.size, PROT_READ | PROT_WRITE, |
| | 236 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| | 237 | if (buf != MAP_FAILED) { |
| | 238 | ssize_t tmp; |
| | 239 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
| | 240 | err(FSCK_EX_ERROR, _("seek on %s failed"), filename); |
| | 241 | tmp = read(fd, buf, super.size); |
| | 242 | if (tmp < 0) |
| | 243 | err(FSCK_EX_ERROR, _("cannot read %s"), filename); |
| | 244 | if (tmp != (ssize_t) super.size) |
| | 245 | errx(FSCK_EX_ERROR, _("failed to read %"PRIu32" bytes from file %s"), |
| | 246 | super.size, filename); |
| | 247 | } |
| | 248 | } |
| | 249 | if (buf != MAP_FAILED) { |
| | 250 | ((struct cramfs_super *)((unsigned char *) buf + start))->fsid.crc = |
| | 251 | crc32(0L, NULL, 0); |
| | 252 | crc = crc32(crc, (unsigned char *) buf + start, super.size - start); |
| | 253 | munmap(buf, super.size); |
| | 254 | } else { |
| | 255 | int retval; |
| | 256 | size_t length = 0; |
| | 257 | |
| | 258 | buf = xmalloc(4096); |
| | 259 | if (lseek(fd, start, SEEK_SET) == (off_t) -1) |
| | 260 | err(FSCK_EX_ERROR, _("seek on %s failed"), filename); |
| | 261 | for (;;) { |
| | 262 | retval = read(fd, buf, 4096); |
| | 263 | if (retval < 0) |
| | 264 | err(FSCK_EX_ERROR, _("cannot read %s"), filename); |
| | 265 | else if (retval == 0) |
| | 266 | break; |
| | 267 | if (length == 0) |
| | 268 | ((struct cramfs_super *)buf)->fsid.crc = |
| | 269 | crc32(0L, NULL, 0); |
| | 270 | length += retval; |
| | 271 | if (length > (super.size - start)) { |
| | 272 | crc = crc32(crc, buf, |
| | 273 | retval - (length - |
| | 274 | (super.size - start))); |
| | 275 | break; |
| | 276 | } |
| | 277 | crc = crc32(crc, buf, retval); |
| | 278 | } |
| | 279 | free(buf); |
| | 280 | } |
| | 281 | |
| | 282 | if (crc != super.fsid.crc) |
| | 283 | errx(FSCK_EX_UNCORRECTED, _("crc error")); |
| | 284 | } |
| | 285 | |
| | 286 | static void print_node(char type, struct cramfs_inode *i, char *name) |
| | 287 | { |
| | 288 | char info[10]; |
| | 289 | |
| | 290 | if (S_ISCHR(i->mode) || (S_ISBLK(i->mode))) |
| | 291 | /* major/minor numbers can be as high as 2^12 or 4096 */ |
| | 292 | snprintf(info, 10, "%4d,%4d", major(i->size), minor(i->size)); |
| | 293 | else |
| | 294 | /* size be as high as 2^24 or 16777216 */ |
| | 295 | snprintf(info, 10, "%9d", i->size); |
| | 296 | |
| | 297 | printf("%c %04o %s %5d:%-3d %s\n", |
| | 298 | type, i->mode & ~S_IFMT, info, i->uid, i->gid, |
| | 299 | !*name && type == 'd' ? "/" : name); |
| | 300 | } |
| | 301 | |
| | 302 | /* |
| | 303 | * Create a fake "blocked" access |
| | 304 | */ |
| | 305 | static void *romfs_read(unsigned long offset) |
| | 306 | { |
| | 307 | unsigned int block = offset >> rombufbits; |
| | 308 | if (block != read_buffer_block) { |
| | 309 | ssize_t x; |
| | 310 | |
| | 311 | read_buffer_block = block; |
| | 312 | if (lseek(fd, block << rombufbits, SEEK_SET) == (off_t) -1) |
| | 313 | warn(_("seek failed")); |
| | 314 | |
| | 315 | x = read(fd, read_buffer, rombufsize * 2); |
| | 316 | if (x < 0) |
| | 317 | warn(_("read romfs failed")); |
| | 318 | } |
| | 319 | return read_buffer + (offset & rombufmask); |
| | 320 | } |
| | 321 | |
| | 322 | static struct cramfs_inode *cramfs_iget(struct cramfs_inode *i) |
| | 323 | { |
| | 324 | struct cramfs_inode *inode = xmalloc(sizeof(struct cramfs_inode)); |
| | 325 | |
| | 326 | inode_to_host(cramfs_is_big_endian, i, inode); |
| | 327 | return inode; |
| | 328 | } |
| | 329 | |
| | 330 | static struct cramfs_inode *iget(unsigned int ino) |
| | 331 | { |
| | 332 | return cramfs_iget(romfs_read(ino)); |
| | 333 | } |
| | 334 | |
| | 335 | static void iput(struct cramfs_inode *inode) |
| | 336 | { |
| | 337 | free(inode); |
| | 338 | } |
| | 339 | |
| | 340 | /* |
| | 341 | * Return the offset of the root directory |
| | 342 | */ |
| | 343 | static struct cramfs_inode *read_super(void) |
| | 344 | { |
| | 345 | struct cramfs_inode *root = cramfs_iget(&super.root); |
| | 346 | unsigned long offset = root->offset << 2; |
| | 347 | |
| | 348 | if (!S_ISDIR(root->mode)) |
| | 349 | errx(FSCK_EX_UNCORRECTED, _("root inode is not directory")); |
| | 350 | if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) && |
| | 351 | ((offset != sizeof(struct cramfs_super)) && |
| | 352 | (offset != PAD_SIZE + sizeof(struct cramfs_super)))) { |
| | 353 | errx(FSCK_EX_UNCORRECTED, _("bad root offset (%lu)"), offset); |
| | 354 | } |
| | 355 | return root; |
| | 356 | } |
| | 357 | |
| | 358 | static int uncompress_block(void *src, size_t len) |
| | 359 | { |
| | 360 | int err; |
| | 361 | |
| | 362 | stream.next_in = src; |
| | 363 | stream.avail_in = len; |
| | 364 | |
| | 365 | stream.next_out = (unsigned char *)outbuffer; |
| | 366 | stream.avail_out = blksize * 2; |
| | 367 | |
| | 368 | inflateReset(&stream); |
| | 369 | |
| | 370 | if (len > blksize * 2) |
| | 371 | errx(FSCK_EX_UNCORRECTED, _("data block too large")); |
| | 372 | |
| | 373 | err = inflate(&stream, Z_FINISH); |
| | 374 | if (err != Z_STREAM_END) |
| | 375 | errx(FSCK_EX_UNCORRECTED, _("decompression error: %s"), |
| | 376 | zError(err)); |
| | 377 | return stream.total_out; |
| | 378 | } |
| | 379 | |
| | 380 | #ifndef HAVE_LCHOWN |
| | 381 | #define lchown chown |
| | 382 | #endif |
| | 383 | |
| | 384 | static void do_uncompress(char *path, int outfd, unsigned long offset, |
| | 385 | unsigned long size) |
| | 386 | { |
| | 387 | unsigned long curr = offset + 4 * ((size + blksize - 1) / blksize); |
| | 388 | |
| | 389 | do { |
| | 390 | unsigned long out = blksize; |
| | 391 | unsigned long next = u32_toggle_endianness(cramfs_is_big_endian, |
| | 392 | *(uint32_t *) |
| | 393 | romfs_read(offset)); |
| | 394 | |
| | 395 | if (next > end_data) |
| | 396 | end_data = next; |
| | 397 | |
| | 398 | offset += 4; |
| | 399 | if (curr == next) { |
| | 400 | if (opt_verbose > 1) |
| | 401 | printf(_(" hole at %lu (%zu)\n"), curr, |
| | 402 | blksize); |
| | 403 | if (size < blksize) |
| | 404 | out = size; |
| | 405 | memset(outbuffer, 0x00, out); |
| | 406 | } else { |
| | 407 | if (opt_verbose > 1) |
| | 408 | printf(_(" uncompressing block at %lu to %lu (%lu)\n"), |
| | 409 | curr, next, next - curr); |
| | 410 | out = uncompress_block(romfs_read(curr), next - curr); |
| | 411 | } |
| | 412 | if (size >= blksize) { |
| | 413 | if (out != blksize) |
| | 414 | errx(FSCK_EX_UNCORRECTED, |
| | 415 | _("non-block (%ld) bytes"), out); |
| | 416 | } else { |
| | 417 | if (out != size) |
| | 418 | errx(FSCK_EX_UNCORRECTED, |
| | 419 | _("non-size (%ld vs %ld) bytes"), out, |
| | 420 | size); |
| | 421 | } |
| | 422 | size -= out; |
| | 423 | if (*extract_dir != '\0' && write(outfd, outbuffer, out) < 0) |
| | 424 | err(FSCK_EX_ERROR, _("write failed: %s"), path); |
| | 425 | curr = next; |
| | 426 | } while (size); |
| | 427 | } |
| | 428 | static void change_file_status(char *path, struct cramfs_inode *i) |
| | 429 | { |
| | 430 | const struct timeval epoch[] = { {0,0}, {0,0} }; |
| | 431 | |
| | 432 | if (euid == 0) { |
| | 433 | if (lchown(path, i->uid, i->gid) < 0) |
| | 434 | err(FSCK_EX_ERROR, _("lchown failed: %s"), path); |
| | 435 | if (S_ISLNK(i->mode)) |
| | 436 | return; |
| | 437 | if (((S_ISUID | S_ISGID) & i->mode) && chmod(path, i->mode) < 0) |
| | 438 | err(FSCK_EX_ERROR, _("chmod failed: %s"), path); |
| | 439 | } |
| | 440 | if (S_ISLNK(i->mode)) |
| | 441 | return; |
| | 442 | if (utimes(path, epoch) < 0) |
| | 443 | err(FSCK_EX_ERROR, _("utimes failed: %s"), path); |
| | 444 | } |
| | 445 | |
| | 446 | static int is_dangerous_filename(char *name, int len) |
| | 447 | { |
| | 448 | return (len == 1 && name[0] == '.') || |
| | 449 | (len == 2 && name[0] == '.' && name[1] == '.'); |
| | 450 | } |
| | 451 | |
| | 452 | static void __attribute__((__noreturn__)) |
| | 453 | errx_path(const char *mesg, const char *name, size_t namelen) |
| | 454 | { |
| | 455 | char buf[PATH_MAX] = { 0 }; |
| | 456 | |
| | 457 | namelen = min(namelen, sizeof(buf) - 1); |
| | 458 | memcpy(buf, name, namelen); |
| | 459 | |
| | 460 | errx(FSCK_EX_UNCORRECTED, "%s: %s", mesg, buf); |
| | 461 | } |
| | 462 | |
| | 463 | static void do_directory(char *path, struct cramfs_inode *i) |
| | 464 | { |
| | 465 | int pathlen = strlen(path); |
| | 466 | int count = i->size; |
| | 467 | unsigned long offset = i->offset << 2; |
| | 468 | char *newpath = xmalloc(pathlen + 256); |
| | 469 | |
| | 470 | if (offset == 0 && count != 0) |
| | 471 | errx(FSCK_EX_UNCORRECTED, |
| | 472 | _("directory inode has zero offset and non-zero size: %s"), |
| | 473 | path); |
| | 474 | |
| | 475 | if (offset != 0 && offset < start_dir) |
| | 476 | start_dir = offset; |
| | 477 | |
| | 478 | /* TODO: Do we need to check end_dir for empty case? */ |
| | 479 | memcpy(newpath, path, pathlen); |
| | 480 | newpath[pathlen] = '/'; |
| | 481 | pathlen++; |
| | 482 | if (opt_verbose) |
| | 483 | print_node('d', i, path); |
| | 484 | |
| | 485 | if (*extract_dir != '\0') { |
| | 486 | if (mkdir(path, i->mode) < 0) |
| | 487 | err(FSCK_EX_ERROR, _("mkdir failed: %s"), path); |
| | 488 | change_file_status(path, i); |
| | 489 | } |
| | 490 | while (count > 0) { |
| | 491 | struct cramfs_inode *child = iget(offset); |
| | 492 | char *name; |
| | 493 | int size; |
| | 494 | int newlen = child->namelen << 2; |
| | 495 | |
| | 496 | size = sizeof(struct cramfs_inode) + newlen; |
| | 497 | count -= size; |
| | 498 | |
| | 499 | offset += sizeof(struct cramfs_inode); |
| | 500 | name = romfs_read(offset); |
| | 501 | |
| | 502 | if (memchr(name, '/', newlen) != NULL) |
| | 503 | errx_path(_("illegal filename"), name, newlen); |
| | 504 | if (*extract_dir != '\0' && is_dangerous_filename(name, newlen)) |
| | 505 | errx_path(_("dangerous filename"), name, newlen); |
| | 506 | memcpy(newpath + pathlen, name, newlen); |
| | 507 | newpath[pathlen + newlen] = 0; |
| | 508 | if (newlen == 0) |
| | 509 | errx(FSCK_EX_UNCORRECTED, _("filename length is zero")); |
| | 510 | if ((pathlen + newlen) - strlen(newpath) > 3) |
| | 511 | errx(FSCK_EX_UNCORRECTED, _("bad filename length")); |
| | 512 | expand_fs(newpath, child); |
| | 513 | |
| | 514 | offset += newlen; |
| | 515 | |
| | 516 | if (offset <= start_dir) |
| | 517 | errx(FSCK_EX_UNCORRECTED, _("bad inode offset")); |
| | 518 | if (offset > end_dir) |
| | 519 | end_dir = offset; |
| | 520 | iput(child); /* free(child) */ |
| | 521 | } |
| | 522 | free(newpath); |
| | 523 | } |
| | 524 | |
| | 525 | static void do_file(char *path, struct cramfs_inode *i) |
| | 526 | { |
| | 527 | unsigned long offset = i->offset << 2; |
| | 528 | int outfd = 0; |
| | 529 | |
| | 530 | if (offset == 0 && i->size != 0) |
| | 531 | errx(FSCK_EX_UNCORRECTED, |
| | 532 | _("file inode has zero offset and non-zero size")); |
| | 533 | if (i->size == 0 && offset != 0) |
| | 534 | errx(FSCK_EX_UNCORRECTED, |
| | 535 | _("file inode has zero size and non-zero offset")); |
| | 536 | if (offset != 0 && offset < start_data) |
| | 537 | start_data = offset; |
| | 538 | if (opt_verbose) |
| | 539 | print_node('f', i, path); |
| | 540 | if (*extract_dir != '\0') { |
| | 541 | outfd = open(path, O_WRONLY | O_CREAT | O_TRUNC, i->mode); |
| | 542 | if (outfd < 0) |
| | 543 | err(FSCK_EX_ERROR, _("cannot open %s"), path); |
| | 544 | } |
| | 545 | if (i->size) |
| | 546 | do_uncompress(path, outfd, offset, i->size); |
| | 547 | if ( *extract_dir != '\0') { |
| | 548 | if (close_fd(outfd) != 0) |
| | 549 | err(FSCK_EX_ERROR, _("write failed: %s"), path); |
| | 550 | change_file_status(path, i); |
| | 551 | } |
| | 552 | } |
| | 553 | |
| | 554 | static void do_symlink(char *path, struct cramfs_inode *i) |
| | 555 | { |
| | 556 | unsigned long offset = i->offset << 2; |
| | 557 | unsigned long curr = offset + 4; |
| | 558 | unsigned long next = |
| | 559 | u32_toggle_endianness(cramfs_is_big_endian, |
| | 560 | *(uint32_t *) romfs_read(offset)); |
| | 561 | unsigned long size; |
| | 562 | |
| | 563 | if (offset == 0) |
| | 564 | errx(FSCK_EX_UNCORRECTED, _("symbolic link has zero offset")); |
| | 565 | if (i->size == 0) |
| | 566 | errx(FSCK_EX_UNCORRECTED, _("symbolic link has zero size")); |
| | 567 | |
| | 568 | if (offset < start_data) |
| | 569 | start_data = offset; |
| | 570 | if (next > end_data) |
| | 571 | end_data = next; |
| | 572 | |
| | 573 | size = uncompress_block(romfs_read(curr), next - curr); |
| | 574 | if (size != i->size) |
| | 575 | errx(FSCK_EX_UNCORRECTED, _("size error in symlink: %s"), path); |
| | 576 | outbuffer[size] = 0; |
| | 577 | if (opt_verbose) { |
| | 578 | char *str; |
| | 579 | |
| | 580 | xasprintf(&str, "%s -> %s", path, outbuffer); |
| | 581 | print_node('l', i, str); |
| | 582 | if (opt_verbose > 1) |
| | 583 | printf(_(" uncompressing block at %lu to %lu (%lu)\n"), |
| | 584 | curr, next, next - curr); |
| | 585 | free(str); |
| | 586 | } |
| | 587 | if (*extract_dir != '\0') { |
| | 588 | if (symlink(outbuffer, path) < 0) |
| | 589 | err(FSCK_EX_ERROR, _("symlink failed: %s"), path); |
| | 590 | change_file_status(path, i); |
| | 591 | } |
| | 592 | } |
| | 593 | |
| | 594 | static void do_special_inode(char *path, struct cramfs_inode *i) |
| | 595 | { |
| | 596 | dev_t devtype = 0; |
| | 597 | char type; |
| | 598 | |
| | 599 | if (i->offset) |
| | 600 | /* no need to shift offset */ |
| | 601 | errx(FSCK_EX_UNCORRECTED, |
| | 602 | _("special file has non-zero offset: %s"), path); |
| | 603 | |
| | 604 | if (S_ISCHR(i->mode)) { |
| | 605 | devtype = i->size; |
| | 606 | type = 'c'; |
| | 607 | } else if (S_ISBLK(i->mode)) { |
| | 608 | devtype = i->size; |
| | 609 | type = 'b'; |
| | 610 | } else if (S_ISFIFO(i->mode)) { |
| | 611 | if (i->size != 0) |
| | 612 | errx(FSCK_EX_UNCORRECTED, _("fifo has non-zero size: %s"), |
| | 613 | path); |
| | 614 | type = 'p'; |
| | 615 | } else if (S_ISSOCK(i->mode)) { |
| | 616 | if (i->size != 0) |
| | 617 | errx(FSCK_EX_UNCORRECTED, |
| | 618 | _("socket has non-zero size: %s"), path); |
| | 619 | type = 's'; |
| | 620 | } else { |
| | 621 | errx(FSCK_EX_UNCORRECTED, _("bogus mode: %s (%o)"), path, i->mode); |
| | 622 | return; /* not reached */ |
| | 623 | } |
| | 624 | |
| | 625 | if (opt_verbose) |
| | 626 | print_node(type, i, path); |
| | 627 | |
| | 628 | if (*extract_dir != '\0') { |
| | 629 | if (mknod(path, i->mode, devtype) < 0) |
| | 630 | err(FSCK_EX_ERROR, _("mknod failed: %s"), path); |
| | 631 | change_file_status(path, i); |
| | 632 | } |
| | 633 | } |
| | 634 | |
| | 635 | static void expand_fs(char *path, struct cramfs_inode *inode) |
| | 636 | { |
| | 637 | if (S_ISDIR(inode->mode)) |
| | 638 | do_directory(path, inode); |
| | 639 | else if (S_ISREG(inode->mode)) |
| | 640 | do_file(path, inode); |
| | 641 | else if (S_ISLNK(inode->mode)) |
| | 642 | do_symlink(path, inode); |
| | 643 | else |
| | 644 | do_special_inode(path, inode); |
| | 645 | } |
| | 646 | |
| | 647 | static void test_fs(int start) |
| | 648 | { |
| | 649 | struct cramfs_inode *root; |
| | 650 | |
| | 651 | root = read_super(); |
| | 652 | umask(0); |
| | 653 | euid = geteuid(); |
| | 654 | stream.next_in = NULL; |
| | 655 | stream.avail_in = 0; |
| | 656 | inflateInit(&stream); |
| | 657 | expand_fs(extract_dir, root); |
| | 658 | inflateEnd(&stream); |
| | 659 | if (start_data != ~0UL) { |
| | 660 | if (start_data < (sizeof(struct cramfs_super) + start)) |
| | 661 | errx(FSCK_EX_UNCORRECTED, |
| | 662 | _("directory data start (%lu) < sizeof(struct cramfs_super) + start (%zu)"), |
| | 663 | start_data, sizeof(struct cramfs_super) + start); |
| | 664 | if (end_dir != start_data) |
| | 665 | errx(FSCK_EX_UNCORRECTED, |
| | 666 | _("directory data end (%lu) != file data start (%lu)"), |
| | 667 | end_dir, start_data); |
| | 668 | } |
| | 669 | if (super.flags & CRAMFS_FLAG_FSID_VERSION_2 && end_data > super.size) |
| | 670 | errx(FSCK_EX_UNCORRECTED, _("invalid file data offset")); |
| | 671 | |
| | 672 | iput(root); /* free(root) */ |
| | 673 | } |
| | 674 | |
| | 675 | int main(int argc, char **argv) |
| | 676 | { |
| | 677 | int c; /* for getopt */ |
| | 678 | int start = 0; |
| | 679 | |
| | 680 | static const struct option longopts[] = { |
| | 681 | {"verbose", no_argument, NULL, 'v'}, |
| | 682 | {"version", no_argument, NULL, 'V'}, |
| | 683 | {"help", no_argument, NULL, 'h'}, |
| | 684 | {"blocksize", required_argument, NULL, 'b'}, |
| | 685 | {"extract", optional_argument, NULL, 'x'}, |
| | 686 | {NULL, 0, NULL, 0}, |
| | 687 | }; |
| | 688 | |
| | 689 | setlocale(LC_MESSAGES, ""); |
| | 690 | setlocale(LC_CTYPE, ""); |
| | 691 | bindtextdomain(PACKAGE, LOCALEDIR); |
| | 692 | textdomain(PACKAGE); |
| | 693 | close_stdout_atexit(); |
| | 694 | |
| | 695 | strutils_set_exitcode(FSCK_EX_USAGE); |
| | 696 | |
| | 697 | /* command line options */ |
| | 698 | while ((c = getopt_long(argc, argv, "ayvVhb:", longopts, NULL)) != EOF) |
| | 699 | switch (c) { |
| | 700 | case 'a': /* ignore */ |
| | 701 | case 'y': |
| | 702 | break; |
| | 703 | case 'h': |
| | 704 | usage(); |
| | 705 | break; |
| | 706 | case 'V': |
| | 707 | print_version(FSCK_EX_OK); |
| | 708 | case 'x': |
| | 709 | opt_extract = 1; |
| | 710 | if(optarg) |
| | 711 | extract_dir = optarg; |
| | 712 | break; |
| | 713 | case 'v': |
| | 714 | opt_verbose++; |
| | 715 | break; |
| | 716 | case 'b': |
| | 717 | blksize = strtou32_or_err(optarg, _("invalid blocksize argument")); |
| | 718 | break; |
| | 719 | default: |
| | 720 | errtryhelp(FSCK_EX_USAGE); |
| | 721 | } |
| | 722 | |
| | 723 | if ((argc - optind) != 1){ |
| | 724 | warnx(_("bad usage")); |
| | 725 | errtryhelp(FSCK_EX_USAGE); |
| | 726 | } |
| | 727 | filename = argv[optind]; |
| | 728 | |
| | 729 | test_super(&start); |
| | 730 | test_crc(start); |
| | 731 | |
| | 732 | if (opt_extract) { |
| | 733 | size_t bufsize = 0; |
| | 734 | |
| | 735 | if (blksize == 0) |
| | 736 | blksize = getpagesize(); |
| | 737 | |
| | 738 | /* re-calculate according to blksize */ |
| | 739 | bufsize = rombufsize = blksize * 2; |
| | 740 | rombufbits = 0; |
| | 741 | while (bufsize >>= 1) |
| | 742 | rombufbits++; |
| | 743 | rombufmask = rombufsize - 1; |
| | 744 | |
| | 745 | outbuffer = xmalloc(blksize * 2); |
| | 746 | read_buffer = xmalloc(rombufsize * 2); |
| | 747 | test_fs(start); |
| | 748 | } |
| | 749 | |
| | 750 | if (opt_verbose) |
| | 751 | printf(_("%s: OK\n"), filename); |
| | 752 | |
| | 753 | exit(FSCK_EX_OK); |
| | 754 | } |
projects / thirdparty / util-linux.git / blame_incremental