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/posix_acl.h> 10 #include <linux/posix_acl_xattr.h> 11 #include <linux/xattr.h> 12 13 #include "debug.h" 14 #include "ntfs.h" 15 #include "ntfs_fs.h" 16 17 // clang-format off 18 #define SYSTEM_DOS_ATTRIB "system.dos_attrib" 19 #define SYSTEM_NTFS_ATTRIB "system.ntfs_attrib" 20 #define SYSTEM_NTFS_ATTRIB_BE "system.ntfs_attrib_be" 21 #define SYSTEM_NTFS_SECURITY "system.ntfs_security" 22 // clang-format on 23 24 static inline size_t unpacked_ea_size(const struct EA_FULL *ea) 25 { 26 return ea->size ? le32_to_cpu(ea->size) : 27 ALIGN(struct_size(ea, name, 28 1 + ea->name_len + 29 le16_to_cpu(ea->elength)), 30 4); 31 } 32 33 static inline size_t packed_ea_size(const struct EA_FULL *ea) 34 { 35 return struct_size(ea, name, 36 1 + ea->name_len + le16_to_cpu(ea->elength)) - 37 offsetof(struct EA_FULL, flags); 38 } 39 40 /* 41 * find_ea 42 * 43 * Assume there is at least one xattr in the list. 44 */ 45 static inline bool find_ea(const struct EA_FULL *ea_all, u32 bytes, 46 const char *name, u8 name_len, u32 *off, u32 *ea_sz) 47 { 48 u32 ea_size; 49 50 *off = 0; 51 if (!ea_all) 52 return false; 53 54 for (; *off < bytes; *off += ea_size) { 55 const struct EA_FULL *ea = Add2Ptr(ea_all, *off); 56 ea_size = unpacked_ea_size(ea); 57 if (ea->name_len == name_len && 58 !memcmp(ea->name, name, name_len)) { 59 if (ea_sz) 60 *ea_sz = ea_size; 61 return true; 62 } 63 } 64 65 return false; 66 } 67 68 /* 69 * ntfs_read_ea - Read all extended attributes. 70 * @ea: New allocated memory. 71 * @info: Pointer into resident data. 72 */ 73 static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea, 74 size_t add_bytes, const struct EA_INFO **info) 75 { 76 int err = -EINVAL; 77 struct ntfs_sb_info *sbi = ni->mi.sbi; 78 struct ATTR_LIST_ENTRY *le = NULL; 79 struct ATTRIB *attr_info, *attr_ea; 80 void *ea_p; 81 u32 size, off, ea_size; 82 83 static_assert(le32_to_cpu(ATTR_EA_INFO) < le32_to_cpu(ATTR_EA)); 84 85 *ea = NULL; 86 *info = NULL; 87 88 attr_info = 89 ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, NULL); 90 attr_ea = 91 ni_find_attr(ni, attr_info, &le, ATTR_EA, NULL, 0, NULL, NULL); 92 93 if (!attr_ea || !attr_info) 94 return 0; 95 96 *info = resident_data_ex(attr_info, sizeof(struct EA_INFO)); 97 if (!*info) 98 goto out; 99 100 /* Check Ea limit. */ 101 size = le32_to_cpu((*info)->size); 102 if (size > sbi->ea_max_size) { 103 err = -EFBIG; 104 goto out; 105 } 106 107 if (attr_size(attr_ea) > sbi->ea_max_size) { 108 err = -EFBIG; 109 goto out; 110 } 111 112 if (!size) { 113 /* EA info persists, but xattr is empty. Looks like EA problem. */ 114 goto out; 115 } 116 117 /* Allocate memory for packed Ea. */ 118 ea_p = kmalloc(size_add(size, add_bytes), GFP_NOFS); 119 if (!ea_p) 120 return -ENOMEM; 121 122 if (attr_ea->non_res) { 123 struct runs_tree run; 124 125 run_init(&run); 126 127 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &run, 0, size); 128 if (!err) 129 err = ntfs_read_run_nb(sbi, &run, 0, ea_p, size, NULL); 130 run_close(&run); 131 132 if (err) 133 goto out1; 134 } else { 135 void *p = resident_data_ex(attr_ea, size); 136 137 if (!p) 138 goto out1; 139 memcpy(ea_p, p, size); 140 } 141 142 memset(Add2Ptr(ea_p, size), 0, add_bytes); 143 144 err = -EINVAL; 145 /* Check all attributes for consistency. */ 146 for (off = 0; off < size; off += ea_size) { 147 const struct EA_FULL *ef = Add2Ptr(ea_p, off); 148 u32 bytes = size - off; 149 150 /* Check if we can use field ea->size. */ 151 if (bytes < sizeof(ef->size)) 152 goto out1; 153 154 if (ef->size) { 155 ea_size = le32_to_cpu(ef->size); 156 if (ea_size > bytes) 157 goto out1; 158 continue; 159 } 160 161 /* Check if we can use fields ef->name_len and ef->elength. */ 162 if (bytes < offsetof(struct EA_FULL, name)) 163 goto out1; 164 165 ea_size = ALIGN(struct_size(ef, name, 166 1 + ef->name_len + 167 le16_to_cpu(ef->elength)), 168 4); 169 if (ea_size > bytes) 170 goto out1; 171 } 172 173 *ea = ea_p; 174 return 0; 175 176 out1: 177 kfree(ea_p); 178 out: 179 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 180 return err; 181 } 182 183 /* 184 * ntfs_list_ea 185 * 186 * Copy a list of xattrs names into the buffer 187 * provided, or compute the buffer size required. 188 * 189 * Return: 190 * * Number of bytes used / required on 191 * * -ERRNO - on failure 192 */ 193 static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer, 194 size_t bytes_per_buffer) 195 { 196 const struct EA_INFO *info; 197 struct EA_FULL *ea_all = NULL; 198 u32 off, size; 199 int err; 200 size_t ret; 201 202 err = ntfs_read_ea(ni, &ea_all, 0, &info); 203 if (err) 204 return err; 205 206 if (!info || !ea_all) 207 return 0; 208 209 size = le32_to_cpu(info->size); 210 211 /* Enumerate all xattrs. */ 212 ret = 0; 213 off = 0; 214 while (off + sizeof(struct EA_FULL) < size) { 215 const struct EA_FULL *ea = Add2Ptr(ea_all, off); 216 int ea_size = unpacked_ea_size(ea); 217 u8 name_len = ea->name_len; 218 219 if (!name_len) 220 break; 221 222 if (name_len > ea_size) { 223 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_ERROR); 224 err = -EINVAL; /* corrupted fs. */ 225 break; 226 } 227 228 if (buffer) { 229 /* Check if we can use field ea->name */ 230 if (off + ea_size > size) 231 break; 232 233 if (ret + name_len + 1 > bytes_per_buffer) { 234 err = -ERANGE; 235 goto out; 236 } 237 238 memcpy(buffer + ret, ea->name, name_len); 239 buffer[ret + name_len] = 0; 240 } 241 242 ret += name_len + 1; 243 off += ea_size; 244 } 245 246 out: 247 kfree(ea_all); 248 return err ? err : ret; 249 } 250 251 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len, 252 void *buffer, size_t size, size_t *required) 253 { 254 struct ntfs_inode *ni = ntfs_i(inode); 255 const struct EA_INFO *info; 256 struct EA_FULL *ea_all = NULL; 257 const struct EA_FULL *ea; 258 u32 off, len; 259 int err; 260 261 if (!(ni->ni_flags & NI_FLAG_EA)) 262 return -ENODATA; 263 264 if (!required) 265 ni_lock(ni); 266 267 len = 0; 268 269 if (name_len > 255) { 270 err = -ENAMETOOLONG; 271 goto out; 272 } 273 274 err = ntfs_read_ea(ni, &ea_all, 0, &info); 275 if (err) 276 goto out; 277 278 if (!info) 279 goto out; 280 281 /* Enumerate all xattrs. */ 282 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off, 283 NULL)) { 284 err = -ENODATA; 285 goto out; 286 } 287 ea = Add2Ptr(ea_all, off); 288 289 len = le16_to_cpu(ea->elength); 290 if (!buffer) { 291 err = 0; 292 goto out; 293 } 294 295 if (len > size) { 296 err = -ERANGE; 297 if (required) 298 *required = len; 299 goto out; 300 } 301 302 memcpy(buffer, ea->name + ea->name_len + 1, len); 303 err = 0; 304 305 out: 306 kfree(ea_all); 307 if (!required) 308 ni_unlock(ni); 309 310 return err ? err : len; 311 } 312 313 static noinline int ntfs_set_ea(struct inode *inode, const char *name, 314 size_t name_len, const void *value, 315 size_t val_size, int flags, bool locked, 316 __le32 *ea_size) 317 { 318 struct ntfs_inode *ni = ntfs_i(inode); 319 struct ntfs_sb_info *sbi = ni->mi.sbi; 320 int err; 321 struct EA_INFO ea_info; 322 const struct EA_INFO *info; 323 struct EA_FULL *new_ea; 324 struct EA_FULL *ea_all = NULL; 325 size_t add, new_pack; 326 u32 off, size, ea_sz; 327 __le16 size_pack; 328 struct ATTRIB *attr; 329 struct ATTR_LIST_ENTRY *le; 330 struct mft_inode *mi; 331 struct runs_tree ea_run; 332 u64 new_sz; 333 void *p; 334 335 if (!locked) 336 ni_lock(ni); 337 338 run_init(&ea_run); 339 340 if (name_len > 255) { 341 err = -ENAMETOOLONG; 342 goto out; 343 } 344 345 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 346 347 err = ntfs_read_ea(ni, &ea_all, add, &info); 348 if (err) 349 goto out; 350 351 if (!info) { 352 memset(&ea_info, 0, sizeof(ea_info)); 353 size = 0; 354 size_pack = 0; 355 } else { 356 memcpy(&ea_info, info, sizeof(ea_info)); 357 size = le32_to_cpu(ea_info.size); 358 size_pack = ea_info.size_pack; 359 } 360 361 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) { 362 struct EA_FULL *ea; 363 364 if (flags & XATTR_CREATE) { 365 err = -EEXIST; 366 goto out; 367 } 368 369 ea = Add2Ptr(ea_all, off); 370 371 /* 372 * Check simple case when we try to insert xattr with the same value 373 * e.g. ntfs_save_wsl_perm 374 */ 375 if (val_size && le16_to_cpu(ea->elength) == val_size && 376 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 377 /* xattr already contains the required value. */ 378 goto out; 379 } 380 381 /* Remove current xattr. */ 382 if (ea->flags & FILE_NEED_EA) 383 le16_add_cpu(&ea_info.count, -1); 384 385 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 386 387 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 388 389 size -= ea_sz; 390 memset(Add2Ptr(ea_all, size), 0, ea_sz); 391 392 ea_info.size = cpu_to_le32(size); 393 394 if ((flags & XATTR_REPLACE) && !val_size) { 395 /* Remove xattr. */ 396 goto update_ea; 397 } 398 } else { 399 if (flags & XATTR_REPLACE) { 400 err = -ENODATA; 401 goto out; 402 } 403 404 if (!ea_all) { 405 ea_all = kzalloc(add, GFP_NOFS); 406 if (!ea_all) { 407 err = -ENOMEM; 408 goto out; 409 } 410 } 411 } 412 413 /* Append new xattr. */ 414 new_ea = Add2Ptr(ea_all, size); 415 new_ea->size = cpu_to_le32(add); 416 new_ea->flags = 0; 417 new_ea->name_len = name_len; 418 new_ea->elength = cpu_to_le16(val_size); 419 memcpy(new_ea->name, name, name_len); 420 new_ea->name[name_len] = 0; 421 memcpy(new_ea->name + name_len + 1, value, val_size); 422 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 423 ea_info.size_pack = cpu_to_le16(new_pack); 424 /* New size of ATTR_EA. */ 425 size += add; 426 ea_info.size = cpu_to_le32(size); 427 428 /* 429 * 1. Check ea_info.size_pack for overflow. 430 * 2. New attribute size must fit value from $AttrDef 431 */ 432 if (new_pack > 0xffff || size > sbi->ea_max_size) { 433 ntfs_inode_warn( 434 inode, 435 "The size of extended attributes must not exceed 64KiB"); 436 err = -EFBIG; // -EINVAL? 437 goto out; 438 } 439 440 update_ea: 441 442 if (!info) { 443 /* Create xattr. */ 444 if (!size) { 445 err = 0; 446 goto out; 447 } 448 449 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 450 ATTR_EA_INFO, NULL, 0, NULL, NULL, 451 NULL); 452 if (err) 453 goto out; 454 455 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 456 NULL); 457 if (err) 458 goto out; 459 } 460 461 new_sz = size; 462 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 463 false, NULL); 464 if (err) 465 goto out; 466 467 le = NULL; 468 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 469 if (!attr) { 470 err = -EINVAL; 471 goto out; 472 } 473 474 if (!size) { 475 /* Delete xattr, ATTR_EA_INFO */ 476 ni_remove_attr_le(ni, attr, mi, le); 477 } else { 478 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 479 if (!p) { 480 err = -EINVAL; 481 goto out; 482 } 483 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 484 mi->dirty = true; 485 } 486 487 le = NULL; 488 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 489 if (!attr) { 490 err = -EINVAL; 491 goto out; 492 } 493 494 if (!size) { 495 /* Delete xattr, ATTR_EA */ 496 ni_remove_attr_le(ni, attr, mi, le); 497 } else if (attr->non_res) { 498 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0, 499 size); 500 if (err) 501 goto out; 502 503 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 504 if (err) 505 goto out; 506 } else { 507 p = resident_data_ex(attr, size); 508 if (!p) { 509 err = -EINVAL; 510 goto out; 511 } 512 memcpy(p, ea_all, size); 513 mi->dirty = true; 514 } 515 516 /* Check if we delete the last xattr. */ 517 if (size) 518 ni->ni_flags |= NI_FLAG_EA; 519 else 520 ni->ni_flags &= ~NI_FLAG_EA; 521 522 if (ea_info.size_pack != size_pack) 523 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 524 if (ea_size) 525 *ea_size = ea_info.size; 526 mark_inode_dirty(&ni->vfs_inode); 527 528 out: 529 if (!locked) 530 ni_unlock(ni); 531 532 run_close(&ea_run); 533 kfree(ea_all); 534 535 return err; 536 } 537 538 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 539 540 /* 541 * ntfs_get_acl - inode_operations::get_acl 542 */ 543 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, 544 int type) 545 { 546 struct inode *inode = d_inode(dentry); 547 struct ntfs_inode *ni = ntfs_i(inode); 548 const char *name; 549 size_t name_len; 550 struct posix_acl *acl; 551 size_t req; 552 int err; 553 void *buf; 554 555 /* Avoid any operation if inode is bad. */ 556 if (unlikely(is_bad_ni(ni))) 557 return ERR_PTR(-EINVAL); 558 559 /* Allocate PATH_MAX bytes. */ 560 buf = __getname(); 561 if (!buf) 562 return ERR_PTR(-ENOMEM); 563 564 /* Possible values of 'type' was already checked above. */ 565 if (type == ACL_TYPE_ACCESS) { 566 name = XATTR_NAME_POSIX_ACL_ACCESS; 567 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 568 } else { 569 name = XATTR_NAME_POSIX_ACL_DEFAULT; 570 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 571 } 572 573 ni_lock(ni); 574 575 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 576 577 ni_unlock(ni); 578 579 /* Translate extended attribute to acl. */ 580 if (err >= 0) { 581 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 582 } else if (err == -ENODATA) { 583 acl = NULL; 584 } else { 585 acl = ERR_PTR(err); 586 } 587 588 if (!IS_ERR(acl)) 589 set_cached_acl(inode, type, acl); 590 591 __putname(buf); 592 593 return acl; 594 } 595 596 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, 597 struct inode *inode, struct posix_acl *acl, 598 int type, bool init_acl) 599 { 600 const char *name; 601 size_t size, name_len; 602 void *value; 603 int err; 604 int flags; 605 umode_t mode; 606 607 /* Avoid any operation if inode is bad. */ 608 if (unlikely(is_bad_ni(ntfs_i(inode)))) 609 return -EINVAL; 610 611 if (S_ISLNK(inode->i_mode)) 612 return -EOPNOTSUPP; 613 614 mode = inode->i_mode; 615 switch (type) { 616 case ACL_TYPE_ACCESS: 617 /* Do not change i_mode if we are in init_acl */ 618 if (acl && !init_acl) { 619 err = posix_acl_update_mode(idmap, inode, &mode, &acl); 620 if (err) 621 return err; 622 } 623 name = XATTR_NAME_POSIX_ACL_ACCESS; 624 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 625 break; 626 627 case ACL_TYPE_DEFAULT: 628 if (!S_ISDIR(inode->i_mode)) 629 return acl ? -EACCES : 0; 630 name = XATTR_NAME_POSIX_ACL_DEFAULT; 631 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 632 break; 633 634 default: 635 return -EINVAL; 636 } 637 638 if (!acl) { 639 /* Remove xattr if it can be presented via mode. */ 640 size = 0; 641 value = NULL; 642 flags = XATTR_REPLACE; 643 } else { 644 size = posix_acl_xattr_size(acl->a_count); 645 value = kmalloc(size, GFP_NOFS); 646 if (!value) 647 return -ENOMEM; 648 err = posix_acl_to_xattr(&init_user_ns, acl, value, size); 649 if (err < 0) 650 goto out; 651 flags = 0; 652 } 653 654 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL); 655 if (err == -ENODATA && !size) 656 err = 0; /* Removing non existed xattr. */ 657 if (err) 658 goto out; 659 660 if (inode->i_mode != mode) { 661 umode_t old_mode = inode->i_mode; 662 inode->i_mode = mode; 663 err = ntfs_save_wsl_perm(inode, NULL); 664 if (err) { 665 inode->i_mode = old_mode; 666 goto out; 667 } 668 inode->i_mode = mode; 669 } 670 set_cached_acl(inode, type, acl); 671 inode_set_ctime_current(inode); 672 mark_inode_dirty(inode); 673 674 out: 675 kfree(value); 676 677 return err; 678 } 679 680 /* 681 * ntfs_set_acl - inode_operations::set_acl 682 */ 683 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 684 struct posix_acl *acl, int type) 685 { 686 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); 687 } 688 689 /* 690 * ntfs_init_acl - Initialize the ACLs of a new inode. 691 * 692 * Called from ntfs_create_inode(). 693 */ 694 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, 695 struct inode *dir) 696 { 697 struct posix_acl *default_acl, *acl; 698 int err; 699 700 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 701 if (err) 702 return err; 703 704 if (default_acl) { 705 err = ntfs_set_acl_ex(idmap, inode, default_acl, 706 ACL_TYPE_DEFAULT, true); 707 posix_acl_release(default_acl); 708 } else { 709 inode->i_default_acl = NULL; 710 } 711 712 if (acl) { 713 if (!err) 714 err = ntfs_set_acl_ex(idmap, inode, acl, 715 ACL_TYPE_ACCESS, true); 716 posix_acl_release(acl); 717 } else { 718 inode->i_acl = NULL; 719 } 720 721 return err; 722 } 723 #endif 724 725 /* 726 * ntfs_acl_chmod - Helper for ntfs_setattr(). 727 */ 728 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry) 729 { 730 struct inode *inode = d_inode(dentry); 731 struct super_block *sb = inode->i_sb; 732 733 if (!(sb->s_flags & SB_POSIXACL)) 734 return 0; 735 736 if (S_ISLNK(inode->i_mode)) 737 return -EOPNOTSUPP; 738 739 return posix_acl_chmod(idmap, dentry, inode->i_mode); 740 } 741 742 /* 743 * ntfs_listxattr - inode_operations::listxattr 744 */ 745 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 746 { 747 struct inode *inode = d_inode(dentry); 748 struct ntfs_inode *ni = ntfs_i(inode); 749 ssize_t ret; 750 751 /* Avoid any operation if inode is bad. */ 752 if (unlikely(is_bad_ni(ni))) 753 return -EINVAL; 754 755 if (!(ni->ni_flags & NI_FLAG_EA)) { 756 /* no xattr in file */ 757 return 0; 758 } 759 760 ni_lock(ni); 761 762 ret = ntfs_list_ea(ni, buffer, size); 763 764 ni_unlock(ni); 765 766 return ret; 767 } 768 769 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 770 struct inode *inode, const char *name, void *buffer, 771 size_t size) 772 { 773 int err; 774 struct ntfs_inode *ni = ntfs_i(inode); 775 776 /* Avoid any operation if inode is bad. */ 777 if (unlikely(is_bad_ni(ni))) 778 return -EINVAL; 779 780 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 781 return -EIO; 782 783 /* Dispatch request. */ 784 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 785 /* system.dos_attrib */ 786 if (!buffer) { 787 err = sizeof(u8); 788 } else if (size < sizeof(u8)) { 789 err = -ENODATA; 790 } else { 791 err = sizeof(u8); 792 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 793 } 794 goto out; 795 } 796 797 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 798 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 799 /* system.ntfs_attrib */ 800 if (!buffer) { 801 err = sizeof(u32); 802 } else if (size < sizeof(u32)) { 803 err = -ENODATA; 804 } else { 805 err = sizeof(u32); 806 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 807 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 808 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer); 809 } 810 goto out; 811 } 812 813 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 814 /* system.ntfs_security*/ 815 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 816 size_t sd_size = 0; 817 818 if (!is_ntfs3(ni->mi.sbi)) { 819 /* We should get nt4 security. */ 820 err = -EINVAL; 821 goto out; 822 } else if (le32_to_cpu(ni->std_security_id) < 823 SECURITY_ID_FIRST) { 824 err = -ENOENT; 825 goto out; 826 } 827 828 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 829 &sd, &sd_size); 830 if (err) 831 goto out; 832 833 if (!is_sd_valid(sd, sd_size)) { 834 ntfs_inode_warn( 835 inode, 836 "looks like you get incorrect security descriptor id=%u", 837 ni->std_security_id); 838 } 839 840 if (!buffer) { 841 err = sd_size; 842 } else if (size < sd_size) { 843 err = -ENODATA; 844 } else { 845 err = sd_size; 846 memcpy(buffer, sd, sd_size); 847 } 848 kfree(sd); 849 goto out; 850 } 851 852 /* Deal with NTFS extended attribute. */ 853 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL); 854 855 out: 856 return err; 857 } 858 859 /* 860 * ntfs_setxattr - inode_operations::setxattr 861 */ 862 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 863 struct mnt_idmap *idmap, struct dentry *de, 864 struct inode *inode, const char *name, 865 const void *value, size_t size, int flags) 866 { 867 int err = -EINVAL; 868 struct ntfs_inode *ni = ntfs_i(inode); 869 enum FILE_ATTRIBUTE new_fa; 870 871 /* Dispatch request. */ 872 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 873 if (sizeof(u8) != size) 874 goto out; 875 new_fa = cpu_to_le32(*(u8 *)value); 876 goto set_new_fa; 877 } 878 879 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 880 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 881 if (size != sizeof(u32)) 882 goto out; 883 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 884 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value)); 885 else 886 new_fa = cpu_to_le32(*(u32 *)value); 887 888 if (S_ISREG(inode->i_mode)) { 889 /* Process compressed/sparsed in special way. */ 890 ni_lock(ni); 891 err = ni_new_attr_flags(ni, new_fa); 892 ni_unlock(ni); 893 if (err) 894 goto out; 895 } 896 set_new_fa: 897 /* 898 * Thanks Mark Harmstone: 899 * Keep directory bit consistency. 900 */ 901 if (S_ISDIR(inode->i_mode)) 902 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 903 else 904 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 905 906 if (ni->std_fa != new_fa) { 907 ni->std_fa = new_fa; 908 if (new_fa & FILE_ATTRIBUTE_READONLY) 909 inode->i_mode &= ~0222; 910 else 911 inode->i_mode |= 0222; 912 /* Std attribute always in primary record. */ 913 ni->mi.dirty = true; 914 mark_inode_dirty(inode); 915 } 916 err = 0; 917 918 goto out; 919 } 920 921 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 922 /* system.ntfs_security*/ 923 __le32 security_id; 924 bool inserted; 925 struct ATTR_STD_INFO5 *std; 926 927 if (!is_ntfs3(ni->mi.sbi)) { 928 /* 929 * We should replace ATTR_SECURE. 930 * Skip this way cause it is nt4 feature. 931 */ 932 err = -EINVAL; 933 goto out; 934 } 935 936 if (!is_sd_valid(value, size)) { 937 err = -EINVAL; 938 ntfs_inode_warn( 939 inode, 940 "you try to set invalid security descriptor"); 941 goto out; 942 } 943 944 err = ntfs_insert_security(ni->mi.sbi, value, size, 945 &security_id, &inserted); 946 if (err) 947 goto out; 948 949 ni_lock(ni); 950 std = ni_std5(ni); 951 if (!std) { 952 err = -EINVAL; 953 } else if (std->security_id != security_id) { 954 std->security_id = ni->std_security_id = security_id; 955 /* Std attribute always in primary record. */ 956 ni->mi.dirty = true; 957 mark_inode_dirty(&ni->vfs_inode); 958 } 959 ni_unlock(ni); 960 goto out; 961 } 962 963 /* Deal with NTFS extended attribute. */ 964 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0, 965 NULL); 966 967 out: 968 inode_set_ctime_current(inode); 969 mark_inode_dirty(inode); 970 971 return err; 972 } 973 974 /* 975 * ntfs_save_wsl_perm 976 * 977 * save uid/gid/mode in xattr 978 */ 979 int ntfs_save_wsl_perm(struct inode *inode, __le32 *ea_size) 980 { 981 int err; 982 __le32 value; 983 struct ntfs_inode *ni = ntfs_i(inode); 984 985 ni_lock(ni); 986 value = cpu_to_le32(i_uid_read(inode)); 987 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 988 sizeof(value), 0, true, ea_size); 989 if (err) 990 goto out; 991 992 value = cpu_to_le32(i_gid_read(inode)); 993 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 994 sizeof(value), 0, true, ea_size); 995 if (err) 996 goto out; 997 998 value = cpu_to_le32(inode->i_mode); 999 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 1000 sizeof(value), 0, true, ea_size); 1001 if (err) 1002 goto out; 1003 1004 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1005 value = cpu_to_le32(inode->i_rdev); 1006 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 1007 sizeof(value), 0, true, ea_size); 1008 if (err) 1009 goto out; 1010 } 1011 1012 out: 1013 ni_unlock(ni); 1014 /* In case of error should we delete all WSL xattr? */ 1015 return err; 1016 } 1017 1018 /* 1019 * ntfs_get_wsl_perm 1020 * 1021 * get uid/gid/mode from xattr 1022 * it is called from ntfs_iget5->ntfs_read_mft 1023 */ 1024 void ntfs_get_wsl_perm(struct inode *inode) 1025 { 1026 size_t sz; 1027 __le32 value[3]; 1028 1029 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 1030 sizeof(value[0]), &sz) == sizeof(value[0]) && 1031 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 1032 sizeof(value[1]), &sz) == sizeof(value[1]) && 1033 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 1034 sizeof(value[2]), &sz) == sizeof(value[2])) { 1035 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1036 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1037 inode->i_mode = le32_to_cpu(value[2]); 1038 1039 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1040 &value[0], sizeof(value), 1041 &sz) == sizeof(value[0])) { 1042 inode->i_rdev = le32_to_cpu(value[0]); 1043 } 1044 } 1045 } 1046 1047 static bool ntfs_xattr_user_list(struct dentry *dentry) 1048 { 1049 return true; 1050 } 1051 1052 // clang-format off 1053 static const struct xattr_handler ntfs_other_xattr_handler = { 1054 .prefix = "", 1055 .get = ntfs_getxattr, 1056 .set = ntfs_setxattr, 1057 .list = ntfs_xattr_user_list, 1058 }; 1059 1060 const struct xattr_handler * const ntfs_xattr_handlers[] = { 1061 &ntfs_other_xattr_handler, 1062 NULL, 1063 }; 1064 // clang-format on 1065