1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) Qu Wenruo 2017. All rights reserved. 4 */ 5 6 /* 7 * The module is used to catch unexpected/corrupted tree block data. 8 * Such behavior can be caused either by a fuzzed image or bugs. 9 * 10 * The objective is to do leaf/node validation checks when tree block is read 11 * from disk, and check *every* possible member, so other code won't 12 * need to checking them again. 13 * 14 * Due to the potential and unwanted damage, every checker needs to be 15 * carefully reviewed otherwise so it does not prevent mount of valid images. 16 */ 17 18 #include <linux/types.h> 19 #include <linux/stddef.h> 20 #include <linux/error-injection.h> 21 #include "ctree.h" 22 #include "tree-checker.h" 23 #include "disk-io.h" 24 #include "compression.h" 25 #include "volumes.h" 26 27 /* 28 * Error message should follow the following format: 29 * corrupt <type>: <identifier>, <reason>[, <bad_value>] 30 * 31 * @type: leaf or node 32 * @identifier: the necessary info to locate the leaf/node. 33 * It's recommended to decode key.objecitd/offset if it's 34 * meaningful. 35 * @reason: describe the error 36 * @bad_value: optional, it's recommended to output bad value and its 37 * expected value (range). 38 * 39 * Since comma is used to separate the components, only space is allowed 40 * inside each component. 41 */ 42 43 /* 44 * Append generic "corrupt leaf/node root=%llu block=%llu slot=%d: " to @fmt. 45 * Allows callers to customize the output. 46 */ 47 __printf(3, 4) 48 __cold 49 static void generic_err(const struct extent_buffer *eb, int slot, 50 const char *fmt, ...) 51 { 52 const struct btrfs_fs_info *fs_info = eb->fs_info; 53 struct va_format vaf; 54 va_list args; 55 56 va_start(args, fmt); 57 58 vaf.fmt = fmt; 59 vaf.va = &args; 60 61 btrfs_crit(fs_info, 62 "corrupt %s: root=%llu block=%llu slot=%d, %pV", 63 btrfs_header_level(eb) == 0 ? "leaf" : "node", 64 btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot, &vaf); 65 va_end(args); 66 } 67 68 /* 69 * Customized reporter for extent data item, since its key objectid and 70 * offset has its own meaning. 71 */ 72 __printf(3, 4) 73 __cold 74 static void file_extent_err(const struct extent_buffer *eb, int slot, 75 const char *fmt, ...) 76 { 77 const struct btrfs_fs_info *fs_info = eb->fs_info; 78 struct btrfs_key key; 79 struct va_format vaf; 80 va_list args; 81 82 btrfs_item_key_to_cpu(eb, &key, slot); 83 va_start(args, fmt); 84 85 vaf.fmt = fmt; 86 vaf.va = &args; 87 88 btrfs_crit(fs_info, 89 "corrupt %s: root=%llu block=%llu slot=%d ino=%llu file_offset=%llu, %pV", 90 btrfs_header_level(eb) == 0 ? "leaf" : "node", 91 btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot, 92 key.objectid, key.offset, &vaf); 93 va_end(args); 94 } 95 96 /* 97 * Return 0 if the btrfs_file_extent_##name is aligned to @alignment 98 * Else return 1 99 */ 100 #define CHECK_FE_ALIGNED(leaf, slot, fi, name, alignment) \ 101 ({ \ 102 if (!IS_ALIGNED(btrfs_file_extent_##name((leaf), (fi)), (alignment))) \ 103 file_extent_err((leaf), (slot), \ 104 "invalid %s for file extent, have %llu, should be aligned to %u", \ 105 (#name), btrfs_file_extent_##name((leaf), (fi)), \ 106 (alignment)); \ 107 (!IS_ALIGNED(btrfs_file_extent_##name((leaf), (fi)), (alignment))); \ 108 }) 109 110 static u64 file_extent_end(struct extent_buffer *leaf, 111 struct btrfs_key *key, 112 struct btrfs_file_extent_item *extent) 113 { 114 u64 end; 115 u64 len; 116 117 if (btrfs_file_extent_type(leaf, extent) == BTRFS_FILE_EXTENT_INLINE) { 118 len = btrfs_file_extent_ram_bytes(leaf, extent); 119 end = ALIGN(key->offset + len, leaf->fs_info->sectorsize); 120 } else { 121 len = btrfs_file_extent_num_bytes(leaf, extent); 122 end = key->offset + len; 123 } 124 return end; 125 } 126 127 static int check_extent_data_item(struct extent_buffer *leaf, 128 struct btrfs_key *key, int slot, 129 struct btrfs_key *prev_key) 130 { 131 struct btrfs_fs_info *fs_info = leaf->fs_info; 132 struct btrfs_file_extent_item *fi; 133 u32 sectorsize = fs_info->sectorsize; 134 u32 item_size = btrfs_item_size_nr(leaf, slot); 135 u64 extent_end; 136 137 if (!IS_ALIGNED(key->offset, sectorsize)) { 138 file_extent_err(leaf, slot, 139 "unaligned file_offset for file extent, have %llu should be aligned to %u", 140 key->offset, sectorsize); 141 return -EUCLEAN; 142 } 143 144 fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); 145 146 if (btrfs_file_extent_type(leaf, fi) > BTRFS_FILE_EXTENT_TYPES) { 147 file_extent_err(leaf, slot, 148 "invalid type for file extent, have %u expect range [0, %u]", 149 btrfs_file_extent_type(leaf, fi), 150 BTRFS_FILE_EXTENT_TYPES); 151 return -EUCLEAN; 152 } 153 154 /* 155 * Support for new compression/encryption must introduce incompat flag, 156 * and must be caught in open_ctree(). 157 */ 158 if (btrfs_file_extent_compression(leaf, fi) > BTRFS_COMPRESS_TYPES) { 159 file_extent_err(leaf, slot, 160 "invalid compression for file extent, have %u expect range [0, %u]", 161 btrfs_file_extent_compression(leaf, fi), 162 BTRFS_COMPRESS_TYPES); 163 return -EUCLEAN; 164 } 165 if (btrfs_file_extent_encryption(leaf, fi)) { 166 file_extent_err(leaf, slot, 167 "invalid encryption for file extent, have %u expect 0", 168 btrfs_file_extent_encryption(leaf, fi)); 169 return -EUCLEAN; 170 } 171 if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) { 172 /* Inline extent must have 0 as key offset */ 173 if (key->offset) { 174 file_extent_err(leaf, slot, 175 "invalid file_offset for inline file extent, have %llu expect 0", 176 key->offset); 177 return -EUCLEAN; 178 } 179 180 /* Compressed inline extent has no on-disk size, skip it */ 181 if (btrfs_file_extent_compression(leaf, fi) != 182 BTRFS_COMPRESS_NONE) 183 return 0; 184 185 /* Uncompressed inline extent size must match item size */ 186 if (item_size != BTRFS_FILE_EXTENT_INLINE_DATA_START + 187 btrfs_file_extent_ram_bytes(leaf, fi)) { 188 file_extent_err(leaf, slot, 189 "invalid ram_bytes for uncompressed inline extent, have %u expect %llu", 190 item_size, BTRFS_FILE_EXTENT_INLINE_DATA_START + 191 btrfs_file_extent_ram_bytes(leaf, fi)); 192 return -EUCLEAN; 193 } 194 return 0; 195 } 196 197 /* Regular or preallocated extent has fixed item size */ 198 if (item_size != sizeof(*fi)) { 199 file_extent_err(leaf, slot, 200 "invalid item size for reg/prealloc file extent, have %u expect %zu", 201 item_size, sizeof(*fi)); 202 return -EUCLEAN; 203 } 204 if (CHECK_FE_ALIGNED(leaf, slot, fi, ram_bytes, sectorsize) || 205 CHECK_FE_ALIGNED(leaf, slot, fi, disk_bytenr, sectorsize) || 206 CHECK_FE_ALIGNED(leaf, slot, fi, disk_num_bytes, sectorsize) || 207 CHECK_FE_ALIGNED(leaf, slot, fi, offset, sectorsize) || 208 CHECK_FE_ALIGNED(leaf, slot, fi, num_bytes, sectorsize)) 209 return -EUCLEAN; 210 211 /* Catch extent end overflow */ 212 if (check_add_overflow(btrfs_file_extent_num_bytes(leaf, fi), 213 key->offset, &extent_end)) { 214 file_extent_err(leaf, slot, 215 "extent end overflow, have file offset %llu extent num bytes %llu", 216 key->offset, 217 btrfs_file_extent_num_bytes(leaf, fi)); 218 return -EUCLEAN; 219 } 220 221 /* 222 * Check that no two consecutive file extent items, in the same leaf, 223 * present ranges that overlap each other. 224 */ 225 if (slot > 0 && 226 prev_key->objectid == key->objectid && 227 prev_key->type == BTRFS_EXTENT_DATA_KEY) { 228 struct btrfs_file_extent_item *prev_fi; 229 u64 prev_end; 230 231 prev_fi = btrfs_item_ptr(leaf, slot - 1, 232 struct btrfs_file_extent_item); 233 prev_end = file_extent_end(leaf, prev_key, prev_fi); 234 if (prev_end > key->offset) { 235 file_extent_err(leaf, slot - 1, 236 "file extent end range (%llu) goes beyond start offset (%llu) of the next file extent", 237 prev_end, key->offset); 238 return -EUCLEAN; 239 } 240 } 241 242 return 0; 243 } 244 245 static int check_csum_item(struct extent_buffer *leaf, struct btrfs_key *key, 246 int slot) 247 { 248 struct btrfs_fs_info *fs_info = leaf->fs_info; 249 u32 sectorsize = fs_info->sectorsize; 250 u32 csumsize = btrfs_super_csum_size(fs_info->super_copy); 251 252 if (key->objectid != BTRFS_EXTENT_CSUM_OBJECTID) { 253 generic_err(leaf, slot, 254 "invalid key objectid for csum item, have %llu expect %llu", 255 key->objectid, BTRFS_EXTENT_CSUM_OBJECTID); 256 return -EUCLEAN; 257 } 258 if (!IS_ALIGNED(key->offset, sectorsize)) { 259 generic_err(leaf, slot, 260 "unaligned key offset for csum item, have %llu should be aligned to %u", 261 key->offset, sectorsize); 262 return -EUCLEAN; 263 } 264 if (!IS_ALIGNED(btrfs_item_size_nr(leaf, slot), csumsize)) { 265 generic_err(leaf, slot, 266 "unaligned item size for csum item, have %u should be aligned to %u", 267 btrfs_item_size_nr(leaf, slot), csumsize); 268 return -EUCLEAN; 269 } 270 return 0; 271 } 272 273 /* 274 * Customized reported for dir_item, only important new info is key->objectid, 275 * which represents inode number 276 */ 277 __printf(3, 4) 278 __cold 279 static void dir_item_err(const struct extent_buffer *eb, int slot, 280 const char *fmt, ...) 281 { 282 const struct btrfs_fs_info *fs_info = eb->fs_info; 283 struct btrfs_key key; 284 struct va_format vaf; 285 va_list args; 286 287 btrfs_item_key_to_cpu(eb, &key, slot); 288 va_start(args, fmt); 289 290 vaf.fmt = fmt; 291 vaf.va = &args; 292 293 btrfs_crit(fs_info, 294 "corrupt %s: root=%llu block=%llu slot=%d ino=%llu, %pV", 295 btrfs_header_level(eb) == 0 ? "leaf" : "node", 296 btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot, 297 key.objectid, &vaf); 298 va_end(args); 299 } 300 301 static int check_dir_item(struct extent_buffer *leaf, 302 struct btrfs_key *key, int slot) 303 { 304 struct btrfs_fs_info *fs_info = leaf->fs_info; 305 struct btrfs_dir_item *di; 306 u32 item_size = btrfs_item_size_nr(leaf, slot); 307 u32 cur = 0; 308 309 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); 310 while (cur < item_size) { 311 u32 name_len; 312 u32 data_len; 313 u32 max_name_len; 314 u32 total_size; 315 u32 name_hash; 316 u8 dir_type; 317 318 /* header itself should not cross item boundary */ 319 if (cur + sizeof(*di) > item_size) { 320 dir_item_err(leaf, slot, 321 "dir item header crosses item boundary, have %zu boundary %u", 322 cur + sizeof(*di), item_size); 323 return -EUCLEAN; 324 } 325 326 /* dir type check */ 327 dir_type = btrfs_dir_type(leaf, di); 328 if (dir_type >= BTRFS_FT_MAX) { 329 dir_item_err(leaf, slot, 330 "invalid dir item type, have %u expect [0, %u)", 331 dir_type, BTRFS_FT_MAX); 332 return -EUCLEAN; 333 } 334 335 if (key->type == BTRFS_XATTR_ITEM_KEY && 336 dir_type != BTRFS_FT_XATTR) { 337 dir_item_err(leaf, slot, 338 "invalid dir item type for XATTR key, have %u expect %u", 339 dir_type, BTRFS_FT_XATTR); 340 return -EUCLEAN; 341 } 342 if (dir_type == BTRFS_FT_XATTR && 343 key->type != BTRFS_XATTR_ITEM_KEY) { 344 dir_item_err(leaf, slot, 345 "xattr dir type found for non-XATTR key"); 346 return -EUCLEAN; 347 } 348 if (dir_type == BTRFS_FT_XATTR) 349 max_name_len = XATTR_NAME_MAX; 350 else 351 max_name_len = BTRFS_NAME_LEN; 352 353 /* Name/data length check */ 354 name_len = btrfs_dir_name_len(leaf, di); 355 data_len = btrfs_dir_data_len(leaf, di); 356 if (name_len > max_name_len) { 357 dir_item_err(leaf, slot, 358 "dir item name len too long, have %u max %u", 359 name_len, max_name_len); 360 return -EUCLEAN; 361 } 362 if (name_len + data_len > BTRFS_MAX_XATTR_SIZE(fs_info)) { 363 dir_item_err(leaf, slot, 364 "dir item name and data len too long, have %u max %u", 365 name_len + data_len, 366 BTRFS_MAX_XATTR_SIZE(fs_info)); 367 return -EUCLEAN; 368 } 369 370 if (data_len && dir_type != BTRFS_FT_XATTR) { 371 dir_item_err(leaf, slot, 372 "dir item with invalid data len, have %u expect 0", 373 data_len); 374 return -EUCLEAN; 375 } 376 377 total_size = sizeof(*di) + name_len + data_len; 378 379 /* header and name/data should not cross item boundary */ 380 if (cur + total_size > item_size) { 381 dir_item_err(leaf, slot, 382 "dir item data crosses item boundary, have %u boundary %u", 383 cur + total_size, item_size); 384 return -EUCLEAN; 385 } 386 387 /* 388 * Special check for XATTR/DIR_ITEM, as key->offset is name 389 * hash, should match its name 390 */ 391 if (key->type == BTRFS_DIR_ITEM_KEY || 392 key->type == BTRFS_XATTR_ITEM_KEY) { 393 char namebuf[max(BTRFS_NAME_LEN, XATTR_NAME_MAX)]; 394 395 read_extent_buffer(leaf, namebuf, 396 (unsigned long)(di + 1), name_len); 397 name_hash = btrfs_name_hash(namebuf, name_len); 398 if (key->offset != name_hash) { 399 dir_item_err(leaf, slot, 400 "name hash mismatch with key, have 0x%016x expect 0x%016llx", 401 name_hash, key->offset); 402 return -EUCLEAN; 403 } 404 } 405 cur += total_size; 406 di = (struct btrfs_dir_item *)((void *)di + total_size); 407 } 408 return 0; 409 } 410 411 __printf(3, 4) 412 __cold 413 static void block_group_err(const struct extent_buffer *eb, int slot, 414 const char *fmt, ...) 415 { 416 const struct btrfs_fs_info *fs_info = eb->fs_info; 417 struct btrfs_key key; 418 struct va_format vaf; 419 va_list args; 420 421 btrfs_item_key_to_cpu(eb, &key, slot); 422 va_start(args, fmt); 423 424 vaf.fmt = fmt; 425 vaf.va = &args; 426 427 btrfs_crit(fs_info, 428 "corrupt %s: root=%llu block=%llu slot=%d bg_start=%llu bg_len=%llu, %pV", 429 btrfs_header_level(eb) == 0 ? "leaf" : "node", 430 btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot, 431 key.objectid, key.offset, &vaf); 432 va_end(args); 433 } 434 435 static int check_block_group_item(struct extent_buffer *leaf, 436 struct btrfs_key *key, int slot) 437 { 438 struct btrfs_block_group_item bgi; 439 u32 item_size = btrfs_item_size_nr(leaf, slot); 440 u64 flags; 441 u64 type; 442 443 /* 444 * Here we don't really care about alignment since extent allocator can 445 * handle it. We care more about the size. 446 */ 447 if (key->offset == 0) { 448 block_group_err(leaf, slot, 449 "invalid block group size 0"); 450 return -EUCLEAN; 451 } 452 453 if (item_size != sizeof(bgi)) { 454 block_group_err(leaf, slot, 455 "invalid item size, have %u expect %zu", 456 item_size, sizeof(bgi)); 457 return -EUCLEAN; 458 } 459 460 read_extent_buffer(leaf, &bgi, btrfs_item_ptr_offset(leaf, slot), 461 sizeof(bgi)); 462 if (btrfs_block_group_chunk_objectid(&bgi) != 463 BTRFS_FIRST_CHUNK_TREE_OBJECTID) { 464 block_group_err(leaf, slot, 465 "invalid block group chunk objectid, have %llu expect %llu", 466 btrfs_block_group_chunk_objectid(&bgi), 467 BTRFS_FIRST_CHUNK_TREE_OBJECTID); 468 return -EUCLEAN; 469 } 470 471 if (btrfs_block_group_used(&bgi) > key->offset) { 472 block_group_err(leaf, slot, 473 "invalid block group used, have %llu expect [0, %llu)", 474 btrfs_block_group_used(&bgi), key->offset); 475 return -EUCLEAN; 476 } 477 478 flags = btrfs_block_group_flags(&bgi); 479 if (hweight64(flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) > 1) { 480 block_group_err(leaf, slot, 481 "invalid profile flags, have 0x%llx (%lu bits set) expect no more than 1 bit set", 482 flags & BTRFS_BLOCK_GROUP_PROFILE_MASK, 483 hweight64(flags & BTRFS_BLOCK_GROUP_PROFILE_MASK)); 484 return -EUCLEAN; 485 } 486 487 type = flags & BTRFS_BLOCK_GROUP_TYPE_MASK; 488 if (type != BTRFS_BLOCK_GROUP_DATA && 489 type != BTRFS_BLOCK_GROUP_METADATA && 490 type != BTRFS_BLOCK_GROUP_SYSTEM && 491 type != (BTRFS_BLOCK_GROUP_METADATA | 492 BTRFS_BLOCK_GROUP_DATA)) { 493 block_group_err(leaf, slot, 494 "invalid type, have 0x%llx (%lu bits set) expect either 0x%llx, 0x%llx, 0x%llx or 0x%llx", 495 type, hweight64(type), 496 BTRFS_BLOCK_GROUP_DATA, BTRFS_BLOCK_GROUP_METADATA, 497 BTRFS_BLOCK_GROUP_SYSTEM, 498 BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA); 499 return -EUCLEAN; 500 } 501 return 0; 502 } 503 504 __printf(4, 5) 505 __cold 506 static void chunk_err(const struct extent_buffer *leaf, 507 const struct btrfs_chunk *chunk, u64 logical, 508 const char *fmt, ...) 509 { 510 const struct btrfs_fs_info *fs_info = leaf->fs_info; 511 bool is_sb; 512 struct va_format vaf; 513 va_list args; 514 int i; 515 int slot = -1; 516 517 /* Only superblock eb is able to have such small offset */ 518 is_sb = (leaf->start == BTRFS_SUPER_INFO_OFFSET); 519 520 if (!is_sb) { 521 /* 522 * Get the slot number by iterating through all slots, this 523 * would provide better readability. 524 */ 525 for (i = 0; i < btrfs_header_nritems(leaf); i++) { 526 if (btrfs_item_ptr_offset(leaf, i) == 527 (unsigned long)chunk) { 528 slot = i; 529 break; 530 } 531 } 532 } 533 va_start(args, fmt); 534 vaf.fmt = fmt; 535 vaf.va = &args; 536 537 if (is_sb) 538 btrfs_crit(fs_info, 539 "corrupt superblock syschunk array: chunk_start=%llu, %pV", 540 logical, &vaf); 541 else 542 btrfs_crit(fs_info, 543 "corrupt leaf: root=%llu block=%llu slot=%d chunk_start=%llu, %pV", 544 BTRFS_CHUNK_TREE_OBJECTID, leaf->start, slot, 545 logical, &vaf); 546 va_end(args); 547 } 548 549 /* 550 * The common chunk check which could also work on super block sys chunk array. 551 * 552 * Return -EUCLEAN if anything is corrupted. 553 * Return 0 if everything is OK. 554 */ 555 int btrfs_check_chunk_valid(struct extent_buffer *leaf, 556 struct btrfs_chunk *chunk, u64 logical) 557 { 558 struct btrfs_fs_info *fs_info = leaf->fs_info; 559 u64 length; 560 u64 stripe_len; 561 u16 num_stripes; 562 u16 sub_stripes; 563 u64 type; 564 u64 features; 565 bool mixed = false; 566 567 length = btrfs_chunk_length(leaf, chunk); 568 stripe_len = btrfs_chunk_stripe_len(leaf, chunk); 569 num_stripes = btrfs_chunk_num_stripes(leaf, chunk); 570 sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); 571 type = btrfs_chunk_type(leaf, chunk); 572 573 if (!num_stripes) { 574 chunk_err(leaf, chunk, logical, 575 "invalid chunk num_stripes, have %u", num_stripes); 576 return -EUCLEAN; 577 } 578 if (!IS_ALIGNED(logical, fs_info->sectorsize)) { 579 chunk_err(leaf, chunk, logical, 580 "invalid chunk logical, have %llu should aligned to %u", 581 logical, fs_info->sectorsize); 582 return -EUCLEAN; 583 } 584 if (btrfs_chunk_sector_size(leaf, chunk) != fs_info->sectorsize) { 585 chunk_err(leaf, chunk, logical, 586 "invalid chunk sectorsize, have %u expect %u", 587 btrfs_chunk_sector_size(leaf, chunk), 588 fs_info->sectorsize); 589 return -EUCLEAN; 590 } 591 if (!length || !IS_ALIGNED(length, fs_info->sectorsize)) { 592 chunk_err(leaf, chunk, logical, 593 "invalid chunk length, have %llu", length); 594 return -EUCLEAN; 595 } 596 if (!is_power_of_2(stripe_len) || stripe_len != BTRFS_STRIPE_LEN) { 597 chunk_err(leaf, chunk, logical, 598 "invalid chunk stripe length: %llu", 599 stripe_len); 600 return -EUCLEAN; 601 } 602 if (~(BTRFS_BLOCK_GROUP_TYPE_MASK | BTRFS_BLOCK_GROUP_PROFILE_MASK) & 603 type) { 604 chunk_err(leaf, chunk, logical, 605 "unrecognized chunk type: 0x%llx", 606 ~(BTRFS_BLOCK_GROUP_TYPE_MASK | 607 BTRFS_BLOCK_GROUP_PROFILE_MASK) & 608 btrfs_chunk_type(leaf, chunk)); 609 return -EUCLEAN; 610 } 611 612 if (!is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) && 613 (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) != 0) { 614 chunk_err(leaf, chunk, logical, 615 "invalid chunk profile flag: 0x%llx, expect 0 or 1 bit set", 616 type & BTRFS_BLOCK_GROUP_PROFILE_MASK); 617 return -EUCLEAN; 618 } 619 if ((type & BTRFS_BLOCK_GROUP_TYPE_MASK) == 0) { 620 chunk_err(leaf, chunk, logical, 621 "missing chunk type flag, have 0x%llx one bit must be set in 0x%llx", 622 type, BTRFS_BLOCK_GROUP_TYPE_MASK); 623 return -EUCLEAN; 624 } 625 626 if ((type & BTRFS_BLOCK_GROUP_SYSTEM) && 627 (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA))) { 628 chunk_err(leaf, chunk, logical, 629 "system chunk with data or metadata type: 0x%llx", 630 type); 631 return -EUCLEAN; 632 } 633 634 features = btrfs_super_incompat_flags(fs_info->super_copy); 635 if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) 636 mixed = true; 637 638 if (!mixed) { 639 if ((type & BTRFS_BLOCK_GROUP_METADATA) && 640 (type & BTRFS_BLOCK_GROUP_DATA)) { 641 chunk_err(leaf, chunk, logical, 642 "mixed chunk type in non-mixed mode: 0x%llx", type); 643 return -EUCLEAN; 644 } 645 } 646 647 if ((type & BTRFS_BLOCK_GROUP_RAID10 && sub_stripes != 2) || 648 (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes != 2) || 649 (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) || 650 (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) || 651 (type & BTRFS_BLOCK_GROUP_DUP && num_stripes != 2) || 652 ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 && num_stripes != 1)) { 653 chunk_err(leaf, chunk, logical, 654 "invalid num_stripes:sub_stripes %u:%u for profile %llu", 655 num_stripes, sub_stripes, 656 type & BTRFS_BLOCK_GROUP_PROFILE_MASK); 657 return -EUCLEAN; 658 } 659 660 return 0; 661 } 662 663 __printf(3, 4) 664 __cold 665 static void dev_item_err(const struct extent_buffer *eb, int slot, 666 const char *fmt, ...) 667 { 668 struct btrfs_key key; 669 struct va_format vaf; 670 va_list args; 671 672 btrfs_item_key_to_cpu(eb, &key, slot); 673 va_start(args, fmt); 674 675 vaf.fmt = fmt; 676 vaf.va = &args; 677 678 btrfs_crit(eb->fs_info, 679 "corrupt %s: root=%llu block=%llu slot=%d devid=%llu %pV", 680 btrfs_header_level(eb) == 0 ? "leaf" : "node", 681 btrfs_header_owner(eb), btrfs_header_bytenr(eb), slot, 682 key.objectid, &vaf); 683 va_end(args); 684 } 685 686 static int check_dev_item(struct extent_buffer *leaf, 687 struct btrfs_key *key, int slot) 688 { 689 struct btrfs_dev_item *ditem; 690 691 if (key->objectid != BTRFS_DEV_ITEMS_OBJECTID) { 692 dev_item_err(leaf, slot, 693 "invalid objectid: has=%llu expect=%llu", 694 key->objectid, BTRFS_DEV_ITEMS_OBJECTID); 695 return -EUCLEAN; 696 } 697 ditem = btrfs_item_ptr(leaf, slot, struct btrfs_dev_item); 698 if (btrfs_device_id(leaf, ditem) != key->offset) { 699 dev_item_err(leaf, slot, 700 "devid mismatch: key has=%llu item has=%llu", 701 key->offset, btrfs_device_id(leaf, ditem)); 702 return -EUCLEAN; 703 } 704 705 /* 706 * For device total_bytes, we don't have reliable way to check it, as 707 * it can be 0 for device removal. Device size check can only be done 708 * by dev extents check. 709 */ 710 if (btrfs_device_bytes_used(leaf, ditem) > 711 btrfs_device_total_bytes(leaf, ditem)) { 712 dev_item_err(leaf, slot, 713 "invalid bytes used: have %llu expect [0, %llu]", 714 btrfs_device_bytes_used(leaf, ditem), 715 btrfs_device_total_bytes(leaf, ditem)); 716 return -EUCLEAN; 717 } 718 /* 719 * Remaining members like io_align/type/gen/dev_group aren't really 720 * utilized. Skip them to make later usage of them easier. 721 */ 722 return 0; 723 } 724 725 /* Inode item error output has the same format as dir_item_err() */ 726 #define inode_item_err(fs_info, eb, slot, fmt, ...) \ 727 dir_item_err(eb, slot, fmt, __VA_ARGS__) 728 729 static int check_inode_item(struct extent_buffer *leaf, 730 struct btrfs_key *key, int slot) 731 { 732 struct btrfs_fs_info *fs_info = leaf->fs_info; 733 struct btrfs_inode_item *iitem; 734 u64 super_gen = btrfs_super_generation(fs_info->super_copy); 735 u32 valid_mask = (S_IFMT | S_ISUID | S_ISGID | S_ISVTX | 0777); 736 u32 mode; 737 738 if ((key->objectid < BTRFS_FIRST_FREE_OBJECTID || 739 key->objectid > BTRFS_LAST_FREE_OBJECTID) && 740 key->objectid != BTRFS_ROOT_TREE_DIR_OBJECTID && 741 key->objectid != BTRFS_FREE_INO_OBJECTID) { 742 generic_err(leaf, slot, 743 "invalid key objectid: has %llu expect %llu or [%llu, %llu] or %llu", 744 key->objectid, BTRFS_ROOT_TREE_DIR_OBJECTID, 745 BTRFS_FIRST_FREE_OBJECTID, 746 BTRFS_LAST_FREE_OBJECTID, 747 BTRFS_FREE_INO_OBJECTID); 748 return -EUCLEAN; 749 } 750 if (key->offset != 0) { 751 inode_item_err(fs_info, leaf, slot, 752 "invalid key offset: has %llu expect 0", 753 key->offset); 754 return -EUCLEAN; 755 } 756 iitem = btrfs_item_ptr(leaf, slot, struct btrfs_inode_item); 757 758 /* Here we use super block generation + 1 to handle log tree */ 759 if (btrfs_inode_generation(leaf, iitem) > super_gen + 1) { 760 inode_item_err(fs_info, leaf, slot, 761 "invalid inode generation: has %llu expect (0, %llu]", 762 btrfs_inode_generation(leaf, iitem), 763 super_gen + 1); 764 return -EUCLEAN; 765 } 766 /* Note for ROOT_TREE_DIR_ITEM, mkfs could set its transid 0 */ 767 if (btrfs_inode_transid(leaf, iitem) > super_gen + 1) { 768 inode_item_err(fs_info, leaf, slot, 769 "invalid inode generation: has %llu expect [0, %llu]", 770 btrfs_inode_transid(leaf, iitem), super_gen + 1); 771 return -EUCLEAN; 772 } 773 774 /* 775 * For size and nbytes it's better not to be too strict, as for dir 776 * item its size/nbytes can easily get wrong, but doesn't affect 777 * anything in the fs. So here we skip the check. 778 */ 779 mode = btrfs_inode_mode(leaf, iitem); 780 if (mode & ~valid_mask) { 781 inode_item_err(fs_info, leaf, slot, 782 "unknown mode bit detected: 0x%x", 783 mode & ~valid_mask); 784 return -EUCLEAN; 785 } 786 787 /* 788 * S_IFMT is not bit mapped so we can't completely rely on is_power_of_2, 789 * but is_power_of_2() can save us from checking FIFO/CHR/DIR/REG. 790 * Only needs to check BLK, LNK and SOCKS 791 */ 792 if (!is_power_of_2(mode & S_IFMT)) { 793 if (!S_ISLNK(mode) && !S_ISBLK(mode) && !S_ISSOCK(mode)) { 794 inode_item_err(fs_info, leaf, slot, 795 "invalid mode: has 0%o expect valid S_IF* bit(s)", 796 mode & S_IFMT); 797 return -EUCLEAN; 798 } 799 } 800 if (S_ISDIR(mode) && btrfs_inode_nlink(leaf, iitem) > 1) { 801 inode_item_err(fs_info, leaf, slot, 802 "invalid nlink: has %u expect no more than 1 for dir", 803 btrfs_inode_nlink(leaf, iitem)); 804 return -EUCLEAN; 805 } 806 if (btrfs_inode_flags(leaf, iitem) & ~BTRFS_INODE_FLAG_MASK) { 807 inode_item_err(fs_info, leaf, slot, 808 "unknown flags detected: 0x%llx", 809 btrfs_inode_flags(leaf, iitem) & 810 ~BTRFS_INODE_FLAG_MASK); 811 return -EUCLEAN; 812 } 813 return 0; 814 } 815 816 static int check_root_item(struct extent_buffer *leaf, struct btrfs_key *key, 817 int slot) 818 { 819 struct btrfs_fs_info *fs_info = leaf->fs_info; 820 struct btrfs_root_item ri; 821 const u64 valid_root_flags = BTRFS_ROOT_SUBVOL_RDONLY | 822 BTRFS_ROOT_SUBVOL_DEAD; 823 824 /* No such tree id */ 825 if (key->objectid == 0) { 826 generic_err(leaf, slot, "invalid root id 0"); 827 return -EUCLEAN; 828 } 829 830 /* 831 * Some older kernel may create ROOT_ITEM with non-zero offset, so here 832 * we only check offset for reloc tree whose key->offset must be a 833 * valid tree. 834 */ 835 if (key->objectid == BTRFS_TREE_RELOC_OBJECTID && key->offset == 0) { 836 generic_err(leaf, slot, "invalid root id 0 for reloc tree"); 837 return -EUCLEAN; 838 } 839 840 if (btrfs_item_size_nr(leaf, slot) != sizeof(ri)) { 841 generic_err(leaf, slot, 842 "invalid root item size, have %u expect %zu", 843 btrfs_item_size_nr(leaf, slot), sizeof(ri)); 844 } 845 846 read_extent_buffer(leaf, &ri, btrfs_item_ptr_offset(leaf, slot), 847 sizeof(ri)); 848 849 /* Generation related */ 850 if (btrfs_root_generation(&ri) > 851 btrfs_super_generation(fs_info->super_copy) + 1) { 852 generic_err(leaf, slot, 853 "invalid root generation, have %llu expect (0, %llu]", 854 btrfs_root_generation(&ri), 855 btrfs_super_generation(fs_info->super_copy) + 1); 856 return -EUCLEAN; 857 } 858 if (btrfs_root_generation_v2(&ri) > 859 btrfs_super_generation(fs_info->super_copy) + 1) { 860 generic_err(leaf, slot, 861 "invalid root v2 generation, have %llu expect (0, %llu]", 862 btrfs_root_generation_v2(&ri), 863 btrfs_super_generation(fs_info->super_copy) + 1); 864 return -EUCLEAN; 865 } 866 if (btrfs_root_last_snapshot(&ri) > 867 btrfs_super_generation(fs_info->super_copy) + 1) { 868 generic_err(leaf, slot, 869 "invalid root last_snapshot, have %llu expect (0, %llu]", 870 btrfs_root_last_snapshot(&ri), 871 btrfs_super_generation(fs_info->super_copy) + 1); 872 return -EUCLEAN; 873 } 874 875 /* Alignment and level check */ 876 if (!IS_ALIGNED(btrfs_root_bytenr(&ri), fs_info->sectorsize)) { 877 generic_err(leaf, slot, 878 "invalid root bytenr, have %llu expect to be aligned to %u", 879 btrfs_root_bytenr(&ri), fs_info->sectorsize); 880 return -EUCLEAN; 881 } 882 if (btrfs_root_level(&ri) >= BTRFS_MAX_LEVEL) { 883 generic_err(leaf, slot, 884 "invalid root level, have %u expect [0, %u]", 885 btrfs_root_level(&ri), BTRFS_MAX_LEVEL - 1); 886 return -EUCLEAN; 887 } 888 if (ri.drop_level >= BTRFS_MAX_LEVEL) { 889 generic_err(leaf, slot, 890 "invalid root level, have %u expect [0, %u]", 891 ri.drop_level, BTRFS_MAX_LEVEL - 1); 892 return -EUCLEAN; 893 } 894 895 /* Flags check */ 896 if (btrfs_root_flags(&ri) & ~valid_root_flags) { 897 generic_err(leaf, slot, 898 "invalid root flags, have 0x%llx expect mask 0x%llx", 899 btrfs_root_flags(&ri), valid_root_flags); 900 return -EUCLEAN; 901 } 902 return 0; 903 } 904 905 __printf(3,4) 906 __cold 907 static void extent_err(const struct extent_buffer *eb, int slot, 908 const char *fmt, ...) 909 { 910 struct btrfs_key key; 911 struct va_format vaf; 912 va_list args; 913 u64 bytenr; 914 u64 len; 915 916 btrfs_item_key_to_cpu(eb, &key, slot); 917 bytenr = key.objectid; 918 if (key.type == BTRFS_METADATA_ITEM_KEY || 919 key.type == BTRFS_TREE_BLOCK_REF_KEY || 920 key.type == BTRFS_SHARED_BLOCK_REF_KEY) 921 len = eb->fs_info->nodesize; 922 else 923 len = key.offset; 924 va_start(args, fmt); 925 926 vaf.fmt = fmt; 927 vaf.va = &args; 928 929 btrfs_crit(eb->fs_info, 930 "corrupt %s: block=%llu slot=%d extent bytenr=%llu len=%llu %pV", 931 btrfs_header_level(eb) == 0 ? "leaf" : "node", 932 eb->start, slot, bytenr, len, &vaf); 933 va_end(args); 934 } 935 936 static int check_extent_item(struct extent_buffer *leaf, 937 struct btrfs_key *key, int slot) 938 { 939 struct btrfs_fs_info *fs_info = leaf->fs_info; 940 struct btrfs_extent_item *ei; 941 bool is_tree_block = false; 942 unsigned long ptr; /* Current pointer inside inline refs */ 943 unsigned long end; /* Extent item end */ 944 const u32 item_size = btrfs_item_size_nr(leaf, slot); 945 u64 flags; 946 u64 generation; 947 u64 total_refs; /* Total refs in btrfs_extent_item */ 948 u64 inline_refs = 0; /* found total inline refs */ 949 950 if (key->type == BTRFS_METADATA_ITEM_KEY && 951 !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) { 952 generic_err(leaf, slot, 953 "invalid key type, METADATA_ITEM type invalid when SKINNY_METADATA feature disabled"); 954 return -EUCLEAN; 955 } 956 /* key->objectid is the bytenr for both key types */ 957 if (!IS_ALIGNED(key->objectid, fs_info->sectorsize)) { 958 generic_err(leaf, slot, 959 "invalid key objectid, have %llu expect to be aligned to %u", 960 key->objectid, fs_info->sectorsize); 961 return -EUCLEAN; 962 } 963 964 /* key->offset is tree level for METADATA_ITEM_KEY */ 965 if (key->type == BTRFS_METADATA_ITEM_KEY && 966 key->offset >= BTRFS_MAX_LEVEL) { 967 extent_err(leaf, slot, 968 "invalid tree level, have %llu expect [0, %u]", 969 key->offset, BTRFS_MAX_LEVEL - 1); 970 return -EUCLEAN; 971 } 972 973 /* 974 * EXTENT/METADATA_ITEM consists of: 975 * 1) One btrfs_extent_item 976 * Records the total refs, type and generation of the extent. 977 * 978 * 2) One btrfs_tree_block_info (for EXTENT_ITEM and tree backref only) 979 * Records the first key and level of the tree block. 980 * 981 * 2) Zero or more btrfs_extent_inline_ref(s) 982 * Each inline ref has one btrfs_extent_inline_ref shows: 983 * 2.1) The ref type, one of the 4 984 * TREE_BLOCK_REF Tree block only 985 * SHARED_BLOCK_REF Tree block only 986 * EXTENT_DATA_REF Data only 987 * SHARED_DATA_REF Data only 988 * 2.2) Ref type specific data 989 * Either using btrfs_extent_inline_ref::offset, or specific 990 * data structure. 991 */ 992 if (item_size < sizeof(*ei)) { 993 extent_err(leaf, slot, 994 "invalid item size, have %u expect [%zu, %u)", 995 item_size, sizeof(*ei), 996 BTRFS_LEAF_DATA_SIZE(fs_info)); 997 return -EUCLEAN; 998 } 999 end = item_size + btrfs_item_ptr_offset(leaf, slot); 1000 1001 /* Checks against extent_item */ 1002 ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); 1003 flags = btrfs_extent_flags(leaf, ei); 1004 total_refs = btrfs_extent_refs(leaf, ei); 1005 generation = btrfs_extent_generation(leaf, ei); 1006 if (generation > btrfs_super_generation(fs_info->super_copy) + 1) { 1007 extent_err(leaf, slot, 1008 "invalid generation, have %llu expect (0, %llu]", 1009 generation, 1010 btrfs_super_generation(fs_info->super_copy) + 1); 1011 return -EUCLEAN; 1012 } 1013 if (!is_power_of_2(flags & (BTRFS_EXTENT_FLAG_DATA | 1014 BTRFS_EXTENT_FLAG_TREE_BLOCK))) { 1015 extent_err(leaf, slot, 1016 "invalid extent flag, have 0x%llx expect 1 bit set in 0x%llx", 1017 flags, BTRFS_EXTENT_FLAG_DATA | 1018 BTRFS_EXTENT_FLAG_TREE_BLOCK); 1019 return -EUCLEAN; 1020 } 1021 is_tree_block = !!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK); 1022 if (is_tree_block) { 1023 if (key->type == BTRFS_EXTENT_ITEM_KEY && 1024 key->offset != fs_info->nodesize) { 1025 extent_err(leaf, slot, 1026 "invalid extent length, have %llu expect %u", 1027 key->offset, fs_info->nodesize); 1028 return -EUCLEAN; 1029 } 1030 } else { 1031 if (key->type != BTRFS_EXTENT_ITEM_KEY) { 1032 extent_err(leaf, slot, 1033 "invalid key type, have %u expect %u for data backref", 1034 key->type, BTRFS_EXTENT_ITEM_KEY); 1035 return -EUCLEAN; 1036 } 1037 if (!IS_ALIGNED(key->offset, fs_info->sectorsize)) { 1038 extent_err(leaf, slot, 1039 "invalid extent length, have %llu expect aligned to %u", 1040 key->offset, fs_info->sectorsize); 1041 return -EUCLEAN; 1042 } 1043 } 1044 ptr = (unsigned long)(struct btrfs_extent_item *)(ei + 1); 1045 1046 /* Check the special case of btrfs_tree_block_info */ 1047 if (is_tree_block && key->type != BTRFS_METADATA_ITEM_KEY) { 1048 struct btrfs_tree_block_info *info; 1049 1050 info = (struct btrfs_tree_block_info *)ptr; 1051 if (btrfs_tree_block_level(leaf, info) >= BTRFS_MAX_LEVEL) { 1052 extent_err(leaf, slot, 1053 "invalid tree block info level, have %u expect [0, %u]", 1054 btrfs_tree_block_level(leaf, info), 1055 BTRFS_MAX_LEVEL - 1); 1056 return -EUCLEAN; 1057 } 1058 ptr = (unsigned long)(struct btrfs_tree_block_info *)(info + 1); 1059 } 1060 1061 /* Check inline refs */ 1062 while (ptr < end) { 1063 struct btrfs_extent_inline_ref *iref; 1064 struct btrfs_extent_data_ref *dref; 1065 struct btrfs_shared_data_ref *sref; 1066 u64 dref_offset; 1067 u64 inline_offset; 1068 u8 inline_type; 1069 1070 if (ptr + sizeof(*iref) > end) { 1071 extent_err(leaf, slot, 1072 "inline ref item overflows extent item, ptr %lu iref size %zu end %lu", 1073 ptr, sizeof(*iref), end); 1074 return -EUCLEAN; 1075 } 1076 iref = (struct btrfs_extent_inline_ref *)ptr; 1077 inline_type = btrfs_extent_inline_ref_type(leaf, iref); 1078 inline_offset = btrfs_extent_inline_ref_offset(leaf, iref); 1079 if (ptr + btrfs_extent_inline_ref_size(inline_type) > end) { 1080 extent_err(leaf, slot, 1081 "inline ref item overflows extent item, ptr %lu iref size %u end %lu", 1082 ptr, inline_type, end); 1083 return -EUCLEAN; 1084 } 1085 1086 switch (inline_type) { 1087 /* inline_offset is subvolid of the owner, no need to check */ 1088 case BTRFS_TREE_BLOCK_REF_KEY: 1089 inline_refs++; 1090 break; 1091 /* Contains parent bytenr */ 1092 case BTRFS_SHARED_BLOCK_REF_KEY: 1093 if (!IS_ALIGNED(inline_offset, fs_info->sectorsize)) { 1094 extent_err(leaf, slot, 1095 "invalid tree parent bytenr, have %llu expect aligned to %u", 1096 inline_offset, fs_info->sectorsize); 1097 return -EUCLEAN; 1098 } 1099 inline_refs++; 1100 break; 1101 /* 1102 * Contains owner subvolid, owner key objectid, adjusted offset. 1103 * The only obvious corruption can happen in that offset. 1104 */ 1105 case BTRFS_EXTENT_DATA_REF_KEY: 1106 dref = (struct btrfs_extent_data_ref *)(&iref->offset); 1107 dref_offset = btrfs_extent_data_ref_offset(leaf, dref); 1108 if (!IS_ALIGNED(dref_offset, fs_info->sectorsize)) { 1109 extent_err(leaf, slot, 1110 "invalid data ref offset, have %llu expect aligned to %u", 1111 dref_offset, fs_info->sectorsize); 1112 return -EUCLEAN; 1113 } 1114 inline_refs += btrfs_extent_data_ref_count(leaf, dref); 1115 break; 1116 /* Contains parent bytenr and ref count */ 1117 case BTRFS_SHARED_DATA_REF_KEY: 1118 sref = (struct btrfs_shared_data_ref *)(iref + 1); 1119 if (!IS_ALIGNED(inline_offset, fs_info->sectorsize)) { 1120 extent_err(leaf, slot, 1121 "invalid data parent bytenr, have %llu expect aligned to %u", 1122 inline_offset, fs_info->sectorsize); 1123 return -EUCLEAN; 1124 } 1125 inline_refs += btrfs_shared_data_ref_count(leaf, sref); 1126 break; 1127 default: 1128 extent_err(leaf, slot, "unknown inline ref type: %u", 1129 inline_type); 1130 return -EUCLEAN; 1131 } 1132 ptr += btrfs_extent_inline_ref_size(inline_type); 1133 } 1134 /* No padding is allowed */ 1135 if (ptr != end) { 1136 extent_err(leaf, slot, 1137 "invalid extent item size, padding bytes found"); 1138 return -EUCLEAN; 1139 } 1140 1141 /* Finally, check the inline refs against total refs */ 1142 if (inline_refs > total_refs) { 1143 extent_err(leaf, slot, 1144 "invalid extent refs, have %llu expect >= inline %llu", 1145 total_refs, inline_refs); 1146 return -EUCLEAN; 1147 } 1148 return 0; 1149 } 1150 1151 static int check_simple_keyed_refs(struct extent_buffer *leaf, 1152 struct btrfs_key *key, int slot) 1153 { 1154 u32 expect_item_size = 0; 1155 1156 if (key->type == BTRFS_SHARED_DATA_REF_KEY) 1157 expect_item_size = sizeof(struct btrfs_shared_data_ref); 1158 1159 if (btrfs_item_size_nr(leaf, slot) != expect_item_size) { 1160 generic_err(leaf, slot, 1161 "invalid item size, have %u expect %u for key type %u", 1162 btrfs_item_size_nr(leaf, slot), 1163 expect_item_size, key->type); 1164 return -EUCLEAN; 1165 } 1166 if (!IS_ALIGNED(key->objectid, leaf->fs_info->sectorsize)) { 1167 generic_err(leaf, slot, 1168 "invalid key objectid for shared block ref, have %llu expect aligned to %u", 1169 key->objectid, leaf->fs_info->sectorsize); 1170 return -EUCLEAN; 1171 } 1172 if (key->type != BTRFS_TREE_BLOCK_REF_KEY && 1173 !IS_ALIGNED(key->offset, leaf->fs_info->sectorsize)) { 1174 extent_err(leaf, slot, 1175 "invalid tree parent bytenr, have %llu expect aligned to %u", 1176 key->offset, leaf->fs_info->sectorsize); 1177 return -EUCLEAN; 1178 } 1179 return 0; 1180 } 1181 1182 static int check_extent_data_ref(struct extent_buffer *leaf, 1183 struct btrfs_key *key, int slot) 1184 { 1185 struct btrfs_extent_data_ref *dref; 1186 unsigned long ptr = btrfs_item_ptr_offset(leaf, slot); 1187 const unsigned long end = ptr + btrfs_item_size_nr(leaf, slot); 1188 1189 if (btrfs_item_size_nr(leaf, slot) % sizeof(*dref) != 0) { 1190 generic_err(leaf, slot, 1191 "invalid item size, have %u expect aligned to %zu for key type %u", 1192 btrfs_item_size_nr(leaf, slot), 1193 sizeof(*dref), key->type); 1194 } 1195 if (!IS_ALIGNED(key->objectid, leaf->fs_info->sectorsize)) { 1196 generic_err(leaf, slot, 1197 "invalid key objectid for shared block ref, have %llu expect aligned to %u", 1198 key->objectid, leaf->fs_info->sectorsize); 1199 return -EUCLEAN; 1200 } 1201 for (; ptr < end; ptr += sizeof(*dref)) { 1202 u64 root_objectid; 1203 u64 owner; 1204 u64 offset; 1205 u64 hash; 1206 1207 dref = (struct btrfs_extent_data_ref *)ptr; 1208 root_objectid = btrfs_extent_data_ref_root(leaf, dref); 1209 owner = btrfs_extent_data_ref_objectid(leaf, dref); 1210 offset = btrfs_extent_data_ref_offset(leaf, dref); 1211 hash = hash_extent_data_ref(root_objectid, owner, offset); 1212 if (hash != key->offset) { 1213 extent_err(leaf, slot, 1214 "invalid extent data ref hash, item has 0x%016llx key has 0x%016llx", 1215 hash, key->offset); 1216 return -EUCLEAN; 1217 } 1218 if (!IS_ALIGNED(offset, leaf->fs_info->sectorsize)) { 1219 extent_err(leaf, slot, 1220 "invalid extent data backref offset, have %llu expect aligned to %u", 1221 offset, leaf->fs_info->sectorsize); 1222 } 1223 } 1224 return 0; 1225 } 1226 1227 /* 1228 * Common point to switch the item-specific validation. 1229 */ 1230 static int check_leaf_item(struct extent_buffer *leaf, 1231 struct btrfs_key *key, int slot, 1232 struct btrfs_key *prev_key) 1233 { 1234 int ret = 0; 1235 struct btrfs_chunk *chunk; 1236 1237 switch (key->type) { 1238 case BTRFS_EXTENT_DATA_KEY: 1239 ret = check_extent_data_item(leaf, key, slot, prev_key); 1240 break; 1241 case BTRFS_EXTENT_CSUM_KEY: 1242 ret = check_csum_item(leaf, key, slot); 1243 break; 1244 case BTRFS_DIR_ITEM_KEY: 1245 case BTRFS_DIR_INDEX_KEY: 1246 case BTRFS_XATTR_ITEM_KEY: 1247 ret = check_dir_item(leaf, key, slot); 1248 break; 1249 case BTRFS_BLOCK_GROUP_ITEM_KEY: 1250 ret = check_block_group_item(leaf, key, slot); 1251 break; 1252 case BTRFS_CHUNK_ITEM_KEY: 1253 chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); 1254 ret = btrfs_check_chunk_valid(leaf, chunk, key->offset); 1255 break; 1256 case BTRFS_DEV_ITEM_KEY: 1257 ret = check_dev_item(leaf, key, slot); 1258 break; 1259 case BTRFS_INODE_ITEM_KEY: 1260 ret = check_inode_item(leaf, key, slot); 1261 break; 1262 case BTRFS_ROOT_ITEM_KEY: 1263 ret = check_root_item(leaf, key, slot); 1264 break; 1265 case BTRFS_EXTENT_ITEM_KEY: 1266 case BTRFS_METADATA_ITEM_KEY: 1267 ret = check_extent_item(leaf, key, slot); 1268 break; 1269 case BTRFS_TREE_BLOCK_REF_KEY: 1270 case BTRFS_SHARED_DATA_REF_KEY: 1271 case BTRFS_SHARED_BLOCK_REF_KEY: 1272 ret = check_simple_keyed_refs(leaf, key, slot); 1273 break; 1274 case BTRFS_EXTENT_DATA_REF_KEY: 1275 ret = check_extent_data_ref(leaf, key, slot); 1276 break; 1277 } 1278 return ret; 1279 } 1280 1281 static int check_leaf(struct extent_buffer *leaf, bool check_item_data) 1282 { 1283 struct btrfs_fs_info *fs_info = leaf->fs_info; 1284 /* No valid key type is 0, so all key should be larger than this key */ 1285 struct btrfs_key prev_key = {0, 0, 0}; 1286 struct btrfs_key key; 1287 u32 nritems = btrfs_header_nritems(leaf); 1288 int slot; 1289 1290 if (btrfs_header_level(leaf) != 0) { 1291 generic_err(leaf, 0, 1292 "invalid level for leaf, have %d expect 0", 1293 btrfs_header_level(leaf)); 1294 return -EUCLEAN; 1295 } 1296 1297 /* 1298 * Extent buffers from a relocation tree have a owner field that 1299 * corresponds to the subvolume tree they are based on. So just from an 1300 * extent buffer alone we can not find out what is the id of the 1301 * corresponding subvolume tree, so we can not figure out if the extent 1302 * buffer corresponds to the root of the relocation tree or not. So 1303 * skip this check for relocation trees. 1304 */ 1305 if (nritems == 0 && !btrfs_header_flag(leaf, BTRFS_HEADER_FLAG_RELOC)) { 1306 u64 owner = btrfs_header_owner(leaf); 1307 1308 /* These trees must never be empty */ 1309 if (owner == BTRFS_ROOT_TREE_OBJECTID || 1310 owner == BTRFS_CHUNK_TREE_OBJECTID || 1311 owner == BTRFS_EXTENT_TREE_OBJECTID || 1312 owner == BTRFS_DEV_TREE_OBJECTID || 1313 owner == BTRFS_FS_TREE_OBJECTID || 1314 owner == BTRFS_DATA_RELOC_TREE_OBJECTID) { 1315 generic_err(leaf, 0, 1316 "invalid root, root %llu must never be empty", 1317 owner); 1318 return -EUCLEAN; 1319 } 1320 /* Unknown tree */ 1321 if (owner == 0) { 1322 generic_err(leaf, 0, 1323 "invalid owner, root 0 is not defined"); 1324 return -EUCLEAN; 1325 } 1326 return 0; 1327 } 1328 1329 if (nritems == 0) 1330 return 0; 1331 1332 /* 1333 * Check the following things to make sure this is a good leaf, and 1334 * leaf users won't need to bother with similar sanity checks: 1335 * 1336 * 1) key ordering 1337 * 2) item offset and size 1338 * No overlap, no hole, all inside the leaf. 1339 * 3) item content 1340 * If possible, do comprehensive sanity check. 1341 * NOTE: All checks must only rely on the item data itself. 1342 */ 1343 for (slot = 0; slot < nritems; slot++) { 1344 u32 item_end_expected; 1345 int ret; 1346 1347 btrfs_item_key_to_cpu(leaf, &key, slot); 1348 1349 /* Make sure the keys are in the right order */ 1350 if (btrfs_comp_cpu_keys(&prev_key, &key) >= 0) { 1351 generic_err(leaf, slot, 1352 "bad key order, prev (%llu %u %llu) current (%llu %u %llu)", 1353 prev_key.objectid, prev_key.type, 1354 prev_key.offset, key.objectid, key.type, 1355 key.offset); 1356 return -EUCLEAN; 1357 } 1358 1359 /* 1360 * Make sure the offset and ends are right, remember that the 1361 * item data starts at the end of the leaf and grows towards the 1362 * front. 1363 */ 1364 if (slot == 0) 1365 item_end_expected = BTRFS_LEAF_DATA_SIZE(fs_info); 1366 else 1367 item_end_expected = btrfs_item_offset_nr(leaf, 1368 slot - 1); 1369 if (btrfs_item_end_nr(leaf, slot) != item_end_expected) { 1370 generic_err(leaf, slot, 1371 "unexpected item end, have %u expect %u", 1372 btrfs_item_end_nr(leaf, slot), 1373 item_end_expected); 1374 return -EUCLEAN; 1375 } 1376 1377 /* 1378 * Check to make sure that we don't point outside of the leaf, 1379 * just in case all the items are consistent to each other, but 1380 * all point outside of the leaf. 1381 */ 1382 if (btrfs_item_end_nr(leaf, slot) > 1383 BTRFS_LEAF_DATA_SIZE(fs_info)) { 1384 generic_err(leaf, slot, 1385 "slot end outside of leaf, have %u expect range [0, %u]", 1386 btrfs_item_end_nr(leaf, slot), 1387 BTRFS_LEAF_DATA_SIZE(fs_info)); 1388 return -EUCLEAN; 1389 } 1390 1391 /* Also check if the item pointer overlaps with btrfs item. */ 1392 if (btrfs_item_nr_offset(slot) + sizeof(struct btrfs_item) > 1393 btrfs_item_ptr_offset(leaf, slot)) { 1394 generic_err(leaf, slot, 1395 "slot overlaps with its data, item end %lu data start %lu", 1396 btrfs_item_nr_offset(slot) + 1397 sizeof(struct btrfs_item), 1398 btrfs_item_ptr_offset(leaf, slot)); 1399 return -EUCLEAN; 1400 } 1401 1402 if (check_item_data) { 1403 /* 1404 * Check if the item size and content meet other 1405 * criteria 1406 */ 1407 ret = check_leaf_item(leaf, &key, slot, &prev_key); 1408 if (ret < 0) 1409 return ret; 1410 } 1411 1412 prev_key.objectid = key.objectid; 1413 prev_key.type = key.type; 1414 prev_key.offset = key.offset; 1415 } 1416 1417 return 0; 1418 } 1419 1420 int btrfs_check_leaf_full(struct extent_buffer *leaf) 1421 { 1422 return check_leaf(leaf, true); 1423 } 1424 ALLOW_ERROR_INJECTION(btrfs_check_leaf_full, ERRNO); 1425 1426 int btrfs_check_leaf_relaxed(struct extent_buffer *leaf) 1427 { 1428 return check_leaf(leaf, false); 1429 } 1430 1431 int btrfs_check_node(struct extent_buffer *node) 1432 { 1433 struct btrfs_fs_info *fs_info = node->fs_info; 1434 unsigned long nr = btrfs_header_nritems(node); 1435 struct btrfs_key key, next_key; 1436 int slot; 1437 int level = btrfs_header_level(node); 1438 u64 bytenr; 1439 int ret = 0; 1440 1441 if (level <= 0 || level >= BTRFS_MAX_LEVEL) { 1442 generic_err(node, 0, 1443 "invalid level for node, have %d expect [1, %d]", 1444 level, BTRFS_MAX_LEVEL - 1); 1445 return -EUCLEAN; 1446 } 1447 if (nr == 0 || nr > BTRFS_NODEPTRS_PER_BLOCK(fs_info)) { 1448 btrfs_crit(fs_info, 1449 "corrupt node: root=%llu block=%llu, nritems too %s, have %lu expect range [1,%u]", 1450 btrfs_header_owner(node), node->start, 1451 nr == 0 ? "small" : "large", nr, 1452 BTRFS_NODEPTRS_PER_BLOCK(fs_info)); 1453 return -EUCLEAN; 1454 } 1455 1456 for (slot = 0; slot < nr - 1; slot++) { 1457 bytenr = btrfs_node_blockptr(node, slot); 1458 btrfs_node_key_to_cpu(node, &key, slot); 1459 btrfs_node_key_to_cpu(node, &next_key, slot + 1); 1460 1461 if (!bytenr) { 1462 generic_err(node, slot, 1463 "invalid NULL node pointer"); 1464 ret = -EUCLEAN; 1465 goto out; 1466 } 1467 if (!IS_ALIGNED(bytenr, fs_info->sectorsize)) { 1468 generic_err(node, slot, 1469 "unaligned pointer, have %llu should be aligned to %u", 1470 bytenr, fs_info->sectorsize); 1471 ret = -EUCLEAN; 1472 goto out; 1473 } 1474 1475 if (btrfs_comp_cpu_keys(&key, &next_key) >= 0) { 1476 generic_err(node, slot, 1477 "bad key order, current (%llu %u %llu) next (%llu %u %llu)", 1478 key.objectid, key.type, key.offset, 1479 next_key.objectid, next_key.type, 1480 next_key.offset); 1481 ret = -EUCLEAN; 1482 goto out; 1483 } 1484 } 1485 out: 1486 return ret; 1487 } 1488 ALLOW_ERROR_INJECTION(btrfs_check_node, ERRNO); 1489