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