1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/fs.h> 9 #include <linux/nls.h> 10 #include <linux/ctype.h> 11 #include <linux/posix_acl.h> 12 13 #include "debug.h" 14 #include "ntfs.h" 15 #include "ntfs_fs.h" 16 17 /* 18 * fill_name_de - Format NTFS_DE in @buf. 19 */ 20 int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name, 21 const struct cpu_str *uni) 22 { 23 int err; 24 struct NTFS_DE *e = buf; 25 u16 data_size; 26 struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1); 27 28 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 29 e->ref.high = fname->home.high = 0; 30 #endif 31 if (uni) { 32 #ifdef __BIG_ENDIAN 33 int ulen = uni->len; 34 __le16 *uname = fname->name; 35 const u16 *name_cpu = uni->name; 36 37 while (ulen--) 38 *uname++ = cpu_to_le16(*name_cpu++); 39 #else 40 memcpy(fname->name, uni->name, uni->len * sizeof(u16)); 41 #endif 42 fname->name_len = uni->len; 43 44 } else { 45 /* Convert input string to unicode. */ 46 err = ntfs_nls_to_utf16(sbi, name->name, name->len, 47 (struct cpu_str *)&fname->name_len, 48 NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN); 49 if (err < 0) 50 return err; 51 } 52 53 fname->type = FILE_NAME_POSIX; 54 data_size = fname_full_size(fname); 55 56 e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE)); 57 e->key_size = cpu_to_le16(data_size); 58 e->flags = 0; 59 e->res = 0; 60 61 return 0; 62 } 63 64 /* 65 * ntfs_lookup - inode_operations::lookup 66 */ 67 static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry, 68 u32 flags) 69 { 70 struct ntfs_inode *ni = ntfs_i(dir); 71 struct cpu_str *uni = __getname(); 72 struct inode *inode; 73 int err; 74 75 if (!uni) 76 inode = ERR_PTR(-ENOMEM); 77 else { 78 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name, 79 dentry->d_name.len, uni, NTFS_NAME_LEN, 80 UTF16_HOST_ENDIAN); 81 if (err < 0) 82 inode = ERR_PTR(err); 83 else { 84 ni_lock(ni); 85 inode = dir_search_u(dir, uni, NULL); 86 ni_unlock(ni); 87 } 88 __putname(uni); 89 } 90 91 /* 92 * Check for a null pointer 93 * If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL. 94 * This causes null pointer dereference in d_splice_alias(). 95 */ 96 if (!IS_ERR_OR_NULL(inode) && !inode->i_op) { 97 iput(inode); 98 inode = ERR_PTR(-EINVAL); 99 } 100 101 return d_splice_alias(inode, dentry); 102 } 103 104 /* 105 * ntfs_create - inode_operations::create 106 */ 107 static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir, 108 struct dentry *dentry, umode_t mode, bool excl) 109 { 110 struct inode *inode; 111 112 inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode, 0, 113 NULL, 0, NULL); 114 115 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 116 } 117 118 /* 119 * ntfs_mknod 120 * 121 * inode_operations::mknod 122 */ 123 static int ntfs_mknod(struct mnt_idmap *idmap, struct inode *dir, 124 struct dentry *dentry, umode_t mode, dev_t rdev) 125 { 126 struct inode *inode; 127 128 inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0, 129 NULL); 130 131 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 132 } 133 134 /* 135 * ntfs_link - inode_operations::link 136 */ 137 static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de) 138 { 139 int err; 140 struct inode *inode = d_inode(ode); 141 struct ntfs_inode *ni = ntfs_i(inode); 142 143 if (S_ISDIR(inode->i_mode)) 144 return -EPERM; 145 146 if (inode->i_nlink >= NTFS_LINK_MAX) 147 return -EMLINK; 148 149 ni_lock_dir(ntfs_i(dir)); 150 if (inode != dir) 151 ni_lock(ni); 152 153 inc_nlink(inode); 154 ihold(inode); 155 156 err = ntfs_link_inode(inode, de); 157 158 if (!err) { 159 inode_set_ctime_current(inode); 160 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 161 mark_inode_dirty(inode); 162 mark_inode_dirty(dir); 163 d_instantiate(de, inode); 164 } else { 165 drop_nlink(inode); 166 iput(inode); 167 } 168 169 if (inode != dir) 170 ni_unlock(ni); 171 ni_unlock(ntfs_i(dir)); 172 173 return err; 174 } 175 176 /* 177 * ntfs_unlink - inode_operations::unlink 178 */ 179 static int ntfs_unlink(struct inode *dir, struct dentry *dentry) 180 { 181 struct ntfs_inode *ni = ntfs_i(dir); 182 int err; 183 184 if (unlikely(ntfs3_forced_shutdown(dir->i_sb))) 185 return -EIO; 186 187 ni_lock_dir(ni); 188 189 err = ntfs_unlink_inode(dir, dentry); 190 191 ni_unlock(ni); 192 193 return err; 194 } 195 196 /* 197 * ntfs_symlink - inode_operations::symlink 198 */ 199 static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir, 200 struct dentry *dentry, const char *symname) 201 { 202 u32 size = strlen(symname); 203 struct inode *inode; 204 205 if (unlikely(ntfs3_forced_shutdown(dir->i_sb))) 206 return -EIO; 207 208 inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777, 0, 209 symname, size, NULL); 210 211 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 212 } 213 214 /* 215 * ntfs_mkdir- inode_operations::mkdir 216 */ 217 static int ntfs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 218 struct dentry *dentry, umode_t mode) 219 { 220 struct inode *inode; 221 222 inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode, 0, 223 NULL, 0, NULL); 224 225 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 226 } 227 228 /* 229 * ntfs_rmdir - inode_operations::rmdir 230 */ 231 static int ntfs_rmdir(struct inode *dir, struct dentry *dentry) 232 { 233 struct ntfs_inode *ni = ntfs_i(dir); 234 int err; 235 236 if (unlikely(ntfs3_forced_shutdown(dir->i_sb))) 237 return -EIO; 238 239 ni_lock_dir(ni); 240 241 err = ntfs_unlink_inode(dir, dentry); 242 243 ni_unlock(ni); 244 245 return err; 246 } 247 248 /* 249 * ntfs_rename - inode_operations::rename 250 */ 251 static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir, 252 struct dentry *dentry, struct inode *new_dir, 253 struct dentry *new_dentry, u32 flags) 254 { 255 int err; 256 struct super_block *sb = dir->i_sb; 257 struct ntfs_sb_info *sbi = sb->s_fs_info; 258 struct ntfs_inode *dir_ni = ntfs_i(dir); 259 struct ntfs_inode *new_dir_ni = ntfs_i(new_dir); 260 struct inode *inode = d_inode(dentry); 261 struct ntfs_inode *ni = ntfs_i(inode); 262 struct inode *new_inode = d_inode(new_dentry); 263 struct NTFS_DE *de, *new_de; 264 bool is_same, is_bad; 265 /* 266 * de - memory of PATH_MAX bytes: 267 * [0-1024) - original name (dentry->d_name) 268 * [1024-2048) - paired to original name, usually DOS variant of dentry->d_name 269 * [2048-3072) - new name (new_dentry->d_name) 270 */ 271 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024); 272 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) < 273 1024); 274 static_assert(PATH_MAX >= 4 * 1024); 275 276 if (unlikely(ntfs3_forced_shutdown(sb))) 277 return -EIO; 278 279 if (flags & ~RENAME_NOREPLACE) 280 return -EINVAL; 281 282 is_same = dentry->d_name.len == new_dentry->d_name.len && 283 !memcmp(dentry->d_name.name, new_dentry->d_name.name, 284 dentry->d_name.len); 285 286 if (is_same && dir == new_dir) { 287 /* Nothing to do. */ 288 return 0; 289 } 290 291 if (ntfs_is_meta_file(sbi, inode->i_ino)) { 292 /* Should we print an error? */ 293 return -EINVAL; 294 } 295 296 if (new_inode) { 297 /* Target name exists. Unlink it. */ 298 dget(new_dentry); 299 ni_lock_dir(new_dir_ni); 300 err = ntfs_unlink_inode(new_dir, new_dentry); 301 ni_unlock(new_dir_ni); 302 dput(new_dentry); 303 if (err) 304 return err; 305 } 306 307 /* Allocate PATH_MAX bytes. */ 308 de = __getname(); 309 if (!de) 310 return -ENOMEM; 311 312 /* Translate dentry->d_name into unicode form. */ 313 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 314 if (err < 0) 315 goto out; 316 317 if (is_same) { 318 /* Reuse 'de'. */ 319 new_de = de; 320 } else { 321 /* Translate new_dentry->d_name into unicode form. */ 322 new_de = Add2Ptr(de, 2048); 323 err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL); 324 if (err < 0) 325 goto out; 326 } 327 328 ni_lock_dir(dir_ni); 329 ni_lock(ni); 330 if (dir_ni != new_dir_ni) 331 ni_lock_dir2(new_dir_ni); 332 333 is_bad = false; 334 err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad); 335 if (is_bad) { 336 /* Restore after failed rename failed too. */ 337 _ntfs_bad_inode(inode); 338 } else if (!err) { 339 simple_rename_timestamp(dir, dentry, new_dir, new_dentry); 340 mark_inode_dirty(inode); 341 mark_inode_dirty(dir); 342 if (dir != new_dir) 343 mark_inode_dirty(new_dir); 344 345 if (IS_DIRSYNC(dir)) 346 ntfs_sync_inode(dir); 347 348 if (IS_DIRSYNC(new_dir)) 349 ntfs_sync_inode(inode); 350 } 351 352 if (dir_ni != new_dir_ni) 353 ni_unlock(new_dir_ni); 354 ni_unlock(ni); 355 ni_unlock(dir_ni); 356 out: 357 __putname(de); 358 return err; 359 } 360 361 /* 362 * ntfs_atomic_open 363 * 364 * inode_operations::atomic_open 365 */ 366 static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry, 367 struct file *file, u32 flags, umode_t mode) 368 { 369 int err; 370 struct inode *inode; 371 struct ntfs_fnd *fnd = NULL; 372 struct ntfs_inode *ni = ntfs_i(dir); 373 struct dentry *d = NULL; 374 struct cpu_str *uni = __getname(); 375 bool locked = false; 376 377 if (!uni) 378 return -ENOMEM; 379 380 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name, 381 dentry->d_name.len, uni, NTFS_NAME_LEN, 382 UTF16_HOST_ENDIAN); 383 if (err < 0) 384 goto out; 385 386 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 387 if (IS_POSIXACL(dir)) { 388 /* 389 * Load in cache current acl to avoid ni_lock(dir): 390 * ntfs_create_inode -> ntfs_init_acl -> posix_acl_create -> 391 * ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock 392 */ 393 struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT); 394 395 if (IS_ERR(p)) { 396 err = PTR_ERR(p); 397 goto out; 398 } 399 posix_acl_release(p); 400 } 401 #endif 402 403 if (d_in_lookup(dentry)) { 404 ni_lock_dir(ni); 405 locked = true; 406 fnd = fnd_get(); 407 if (!fnd) { 408 err = -ENOMEM; 409 goto out1; 410 } 411 412 d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry); 413 if (IS_ERR(d)) { 414 err = PTR_ERR(d); 415 d = NULL; 416 goto out2; 417 } 418 419 if (d) 420 dentry = d; 421 } 422 423 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) { 424 err = finish_no_open(file, d); 425 goto out2; 426 } 427 428 file->f_mode |= FMODE_CREATED; 429 430 /* 431 * fnd contains tree's path to insert to. 432 * If fnd is not NULL then dir is locked. 433 */ 434 inode = ntfs_create_inode(mnt_idmap(file->f_path.mnt), dir, dentry, uni, 435 mode, 0, NULL, 0, fnd); 436 err = IS_ERR(inode) ? PTR_ERR(inode) : 437 finish_open(file, dentry, ntfs_file_open); 438 dput(d); 439 440 out2: 441 fnd_put(fnd); 442 out1: 443 if (locked) 444 ni_unlock(ni); 445 out: 446 __putname(uni); 447 return err; 448 } 449 450 struct dentry *ntfs3_get_parent(struct dentry *child) 451 { 452 struct inode *inode = d_inode(child); 453 struct ntfs_inode *ni = ntfs_i(inode); 454 455 struct ATTR_LIST_ENTRY *le = NULL; 456 struct ATTRIB *attr = NULL; 457 struct ATTR_FILE_NAME *fname; 458 459 while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL, 460 NULL))) { 461 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 462 if (!fname) 463 continue; 464 465 return d_obtain_alias( 466 ntfs_iget5(inode->i_sb, &fname->home, NULL)); 467 } 468 469 return ERR_PTR(-ENOENT); 470 } 471 472 /* 473 * dentry_operations::d_hash 474 */ 475 static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name) 476 { 477 struct ntfs_sb_info *sbi; 478 const char *n = name->name; 479 unsigned int len = name->len; 480 unsigned long hash; 481 struct cpu_str *uni; 482 unsigned int c; 483 int err; 484 485 /* First try fast implementation. */ 486 hash = init_name_hash(dentry); 487 488 for (;;) { 489 if (!len--) { 490 name->hash = end_name_hash(hash); 491 return 0; 492 } 493 494 c = *n++; 495 if (c >= 0x80) 496 break; 497 498 hash = partial_name_hash(toupper(c), hash); 499 } 500 501 /* 502 * Try slow way with current upcase table 503 */ 504 uni = __getname(); 505 if (!uni) 506 return -ENOMEM; 507 508 sbi = dentry->d_sb->s_fs_info; 509 510 err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN, 511 UTF16_HOST_ENDIAN); 512 if (err < 0) 513 goto out; 514 515 if (!err) { 516 err = -EINVAL; 517 goto out; 518 } 519 520 hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase, 521 init_name_hash(dentry)); 522 name->hash = end_name_hash(hash); 523 err = 0; 524 525 out: 526 __putname(uni); 527 return err; 528 } 529 530 /* 531 * dentry_operations::d_compare 532 */ 533 static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1, 534 const char *str, const struct qstr *name) 535 { 536 struct ntfs_sb_info *sbi; 537 int ret; 538 const char *n1 = str; 539 const char *n2 = name->name; 540 unsigned int len2 = name->len; 541 unsigned int lm = min(len1, len2); 542 unsigned char c1, c2; 543 struct cpu_str *uni1; 544 struct le_str *uni2; 545 546 /* First try fast implementation. */ 547 for (;;) { 548 if (!lm--) 549 return len1 != len2; 550 551 if ((c1 = *n1++) == (c2 = *n2++)) 552 continue; 553 554 if (c1 >= 0x80 || c2 >= 0x80) 555 break; 556 557 if (toupper(c1) != toupper(c2)) 558 return 1; 559 } 560 561 /* 562 * Try slow way with current upcase table 563 */ 564 sbi = dentry->d_sb->s_fs_info; 565 uni1 = __getname(); 566 if (!uni1) 567 return -ENOMEM; 568 569 ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN, 570 UTF16_HOST_ENDIAN); 571 if (ret < 0) 572 goto out; 573 574 if (!ret) { 575 ret = -EINVAL; 576 goto out; 577 } 578 579 uni2 = Add2Ptr(uni1, 2048); 580 581 ret = ntfs_nls_to_utf16(sbi, name->name, name->len, 582 (struct cpu_str *)uni2, NTFS_NAME_LEN, 583 UTF16_LITTLE_ENDIAN); 584 if (ret < 0) 585 goto out; 586 587 if (!ret) { 588 ret = -EINVAL; 589 goto out; 590 } 591 592 ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1; 593 594 out: 595 __putname(uni1); 596 return ret; 597 } 598 599 // clang-format off 600 const struct inode_operations ntfs_dir_inode_operations = { 601 .lookup = ntfs_lookup, 602 .create = ntfs_create, 603 .link = ntfs_link, 604 .unlink = ntfs_unlink, 605 .symlink = ntfs_symlink, 606 .mkdir = ntfs_mkdir, 607 .rmdir = ntfs_rmdir, 608 .mknod = ntfs_mknod, 609 .rename = ntfs_rename, 610 .get_acl = ntfs_get_acl, 611 .set_acl = ntfs_set_acl, 612 .setattr = ntfs3_setattr, 613 .getattr = ntfs_getattr, 614 .listxattr = ntfs_listxattr, 615 .atomic_open = ntfs_atomic_open, 616 .fiemap = ntfs_fiemap, 617 }; 618 619 const struct inode_operations ntfs_special_inode_operations = { 620 .setattr = ntfs3_setattr, 621 .getattr = ntfs_getattr, 622 .listxattr = ntfs_listxattr, 623 .get_acl = ntfs_get_acl, 624 .set_acl = ntfs_set_acl, 625 }; 626 627 const struct dentry_operations ntfs_dentry_ops = { 628 .d_hash = ntfs_d_hash, 629 .d_compare = ntfs_d_compare, 630 }; 631 632 // clang-format on 633