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 buf = kmalloc(PATH_MAX, GFP_KERNEL); 560 if (!buf) 561 return ERR_PTR(-ENOMEM); 562 563 /* Possible values of 'type' was already checked above. */ 564 if (type == ACL_TYPE_ACCESS) { 565 name = XATTR_NAME_POSIX_ACL_ACCESS; 566 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 567 } else { 568 name = XATTR_NAME_POSIX_ACL_DEFAULT; 569 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 570 } 571 572 ni_lock(ni); 573 574 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 575 576 ni_unlock(ni); 577 578 /* Translate extended attribute to acl. */ 579 if (err >= 0) { 580 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 581 } else if (err == -ENODATA) { 582 acl = NULL; 583 } else { 584 acl = ERR_PTR(err); 585 } 586 587 if (!IS_ERR(acl)) 588 set_cached_acl(inode, type, acl); 589 590 kfree(buf); 591 592 return acl; 593 } 594 595 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, 596 struct inode *inode, struct posix_acl *acl, 597 int type, bool init_acl) 598 { 599 const char *name; 600 size_t size, name_len; 601 void *value; 602 int err; 603 int flags; 604 umode_t mode; 605 606 /* Avoid any operation if inode is bad. */ 607 if (unlikely(is_bad_ni(ntfs_i(inode)))) 608 return -EINVAL; 609 610 if (S_ISLNK(inode->i_mode)) 611 return -EOPNOTSUPP; 612 613 mode = inode->i_mode; 614 switch (type) { 615 case ACL_TYPE_ACCESS: 616 /* Do not change i_mode if we are in init_acl */ 617 if (acl && !init_acl) { 618 err = posix_acl_update_mode(idmap, inode, &mode, &acl); 619 if (err) 620 return err; 621 } 622 name = XATTR_NAME_POSIX_ACL_ACCESS; 623 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 624 break; 625 626 case ACL_TYPE_DEFAULT: 627 if (!S_ISDIR(inode->i_mode)) 628 return acl ? -EACCES : 0; 629 name = XATTR_NAME_POSIX_ACL_DEFAULT; 630 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 631 break; 632 633 default: 634 return -EINVAL; 635 } 636 637 if (!acl) { 638 /* Remove xattr if it can be presented via mode. */ 639 size = 0; 640 value = NULL; 641 flags = XATTR_REPLACE; 642 } else { 643 value = posix_acl_to_xattr(&init_user_ns, acl, &size, GFP_NOFS); 644 if (!value) 645 return -ENOMEM; 646 flags = 0; 647 } 648 649 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL); 650 if (err == -ENODATA && !size) 651 err = 0; /* Removing non existed xattr. */ 652 if (err) 653 goto out; 654 655 if (inode->i_mode != mode) { 656 umode_t old_mode = inode->i_mode; 657 inode->i_mode = mode; 658 err = ntfs_save_wsl_perm(inode, NULL); 659 if (err) { 660 inode->i_mode = old_mode; 661 goto out; 662 } 663 inode->i_mode = mode; 664 } 665 set_cached_acl(inode, type, acl); 666 inode_set_ctime_current(inode); 667 mark_inode_dirty(inode); 668 669 out: 670 kfree(value); 671 672 return err; 673 } 674 675 /* 676 * ntfs_set_acl - inode_operations::set_acl 677 */ 678 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 679 struct posix_acl *acl, int type) 680 { 681 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); 682 } 683 684 /* 685 * ntfs_init_acl - Initialize the ACLs of a new inode. 686 * 687 * Called from ntfs_create_inode(). 688 */ 689 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, 690 struct inode *dir) 691 { 692 struct posix_acl *default_acl, *acl; 693 int err; 694 695 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 696 if (err) 697 return err; 698 699 if (default_acl) { 700 err = ntfs_set_acl_ex(idmap, inode, default_acl, 701 ACL_TYPE_DEFAULT, true); 702 posix_acl_release(default_acl); 703 } else { 704 inode->i_default_acl = NULL; 705 } 706 707 if (acl) { 708 if (!err) 709 err = ntfs_set_acl_ex(idmap, inode, acl, 710 ACL_TYPE_ACCESS, true); 711 posix_acl_release(acl); 712 } else { 713 inode->i_acl = NULL; 714 } 715 716 return err; 717 } 718 #endif 719 720 /* 721 * ntfs_acl_chmod - Helper for ntfs_setattr(). 722 */ 723 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry) 724 { 725 struct inode *inode = d_inode(dentry); 726 struct super_block *sb = inode->i_sb; 727 728 if (!(sb->s_flags & SB_POSIXACL)) 729 return 0; 730 731 if (S_ISLNK(inode->i_mode)) 732 return -EOPNOTSUPP; 733 734 return posix_acl_chmod(idmap, dentry, inode->i_mode); 735 } 736 737 /* 738 * ntfs_listxattr - inode_operations::listxattr 739 */ 740 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 741 { 742 struct inode *inode = d_inode(dentry); 743 struct ntfs_inode *ni = ntfs_i(inode); 744 ssize_t ret; 745 746 /* Avoid any operation if inode is bad. */ 747 if (unlikely(is_bad_ni(ni))) 748 return -EINVAL; 749 750 if (!(ni->ni_flags & NI_FLAG_EA)) { 751 /* no xattr in file */ 752 return 0; 753 } 754 755 ni_lock(ni); 756 757 ret = ntfs_list_ea(ni, buffer, size); 758 759 ni_unlock(ni); 760 761 return ret; 762 } 763 764 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 765 struct inode *inode, const char *name, void *buffer, 766 size_t size) 767 { 768 int err; 769 struct ntfs_inode *ni = ntfs_i(inode); 770 771 /* Avoid any operation if inode is bad. */ 772 if (unlikely(is_bad_ni(ni))) 773 return -EINVAL; 774 775 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 776 return -EIO; 777 778 /* Dispatch request. */ 779 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 780 /* system.dos_attrib */ 781 if (!buffer) { 782 err = sizeof(u8); 783 } else if (size < sizeof(u8)) { 784 err = -ENODATA; 785 } else { 786 err = sizeof(u8); 787 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 788 } 789 goto out; 790 } 791 792 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 793 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 794 /* system.ntfs_attrib */ 795 if (!buffer) { 796 err = sizeof(u32); 797 } else if (size < sizeof(u32)) { 798 err = -ENODATA; 799 } else { 800 err = sizeof(u32); 801 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 802 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 803 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer); 804 } 805 goto out; 806 } 807 808 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 809 /* system.ntfs_security*/ 810 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 811 size_t sd_size = 0; 812 813 if (!is_ntfs3(ni->mi.sbi)) { 814 /* We should get nt4 security. */ 815 err = -EINVAL; 816 goto out; 817 } else if (le32_to_cpu(ni->std_security_id) < 818 SECURITY_ID_FIRST) { 819 err = -ENOENT; 820 goto out; 821 } 822 823 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 824 &sd, &sd_size); 825 if (err) 826 goto out; 827 828 if (!is_sd_valid(sd, sd_size)) { 829 ntfs_inode_warn( 830 inode, 831 "looks like you get incorrect security descriptor id=%u", 832 ni->std_security_id); 833 } 834 835 if (!buffer) { 836 err = sd_size; 837 } else if (size < sd_size) { 838 err = -ENODATA; 839 } else { 840 err = sd_size; 841 memcpy(buffer, sd, sd_size); 842 } 843 kfree(sd); 844 goto out; 845 } 846 847 /* Deal with NTFS extended attribute. */ 848 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL); 849 850 out: 851 return err; 852 } 853 854 /* 855 * ntfs_setxattr - inode_operations::setxattr 856 */ 857 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 858 struct mnt_idmap *idmap, struct dentry *de, 859 struct inode *inode, const char *name, 860 const void *value, size_t size, int flags) 861 { 862 int err = -EINVAL; 863 struct ntfs_inode *ni = ntfs_i(inode); 864 enum FILE_ATTRIBUTE new_fa; 865 866 /* Dispatch request. */ 867 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 868 if (sizeof(u8) != size) 869 goto out; 870 new_fa = cpu_to_le32(*(u8 *)value); 871 goto set_new_fa; 872 } 873 874 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 875 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 876 if (size != sizeof(u32)) 877 goto out; 878 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 879 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value)); 880 else 881 new_fa = cpu_to_le32(*(u32 *)value); 882 883 if (S_ISREG(inode->i_mode)) { 884 /* Process compressed/sparsed in special way. */ 885 ni_lock(ni); 886 err = ni_new_attr_flags(ni, new_fa); 887 ni_unlock(ni); 888 if (err) 889 goto out; 890 } 891 set_new_fa: 892 /* 893 * Thanks Mark Harmstone: 894 * Keep directory bit consistency. 895 */ 896 if (S_ISDIR(inode->i_mode)) 897 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 898 else 899 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 900 901 if (ni->std_fa != new_fa) { 902 ni->std_fa = new_fa; 903 if (new_fa & FILE_ATTRIBUTE_READONLY) 904 inode->i_mode &= ~0222; 905 else 906 inode->i_mode |= 0222; 907 /* Std attribute always in primary record. */ 908 ni->mi.dirty = true; 909 mark_inode_dirty(inode); 910 } 911 err = 0; 912 913 goto out; 914 } 915 916 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 917 /* system.ntfs_security*/ 918 __le32 security_id; 919 bool inserted; 920 struct ATTR_STD_INFO5 *std; 921 922 if (!is_ntfs3(ni->mi.sbi)) { 923 /* 924 * We should replace ATTR_SECURE. 925 * Skip this way cause it is nt4 feature. 926 */ 927 err = -EINVAL; 928 goto out; 929 } 930 931 if (!is_sd_valid(value, size)) { 932 err = -EINVAL; 933 ntfs_inode_warn( 934 inode, 935 "you try to set invalid security descriptor"); 936 goto out; 937 } 938 939 err = ntfs_insert_security(ni->mi.sbi, value, size, 940 &security_id, &inserted); 941 if (err) 942 goto out; 943 944 ni_lock(ni); 945 std = ni_std5(ni); 946 if (!std) { 947 err = -EINVAL; 948 } else if (std->security_id != security_id) { 949 std->security_id = ni->std_security_id = security_id; 950 /* Std attribute always in primary record. */ 951 ni->mi.dirty = true; 952 mark_inode_dirty(&ni->vfs_inode); 953 } 954 ni_unlock(ni); 955 goto out; 956 } 957 958 /* Deal with NTFS extended attribute. */ 959 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0, 960 NULL); 961 962 out: 963 inode_set_ctime_current(inode); 964 mark_inode_dirty(inode); 965 966 return err; 967 } 968 969 /* 970 * ntfs_save_wsl_perm 971 * 972 * save uid/gid/mode in xattr 973 */ 974 int ntfs_save_wsl_perm(struct inode *inode, __le32 *ea_size) 975 { 976 int err; 977 __le32 value; 978 struct ntfs_inode *ni = ntfs_i(inode); 979 980 ni_lock(ni); 981 value = cpu_to_le32(i_uid_read(inode)); 982 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 983 sizeof(value), 0, true, ea_size); 984 if (err) 985 goto out; 986 987 value = cpu_to_le32(i_gid_read(inode)); 988 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 989 sizeof(value), 0, true, ea_size); 990 if (err) 991 goto out; 992 993 value = cpu_to_le32(inode->i_mode); 994 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 995 sizeof(value), 0, true, ea_size); 996 if (err) 997 goto out; 998 999 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1000 value = cpu_to_le32(inode->i_rdev); 1001 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 1002 sizeof(value), 0, true, ea_size); 1003 if (err) 1004 goto out; 1005 } 1006 1007 out: 1008 ni_unlock(ni); 1009 /* In case of error should we delete all WSL xattr? */ 1010 return err; 1011 } 1012 1013 /* 1014 * ntfs_get_wsl_perm 1015 * 1016 * get uid/gid/mode from xattr 1017 * it is called from ntfs_iget5->ntfs_read_mft 1018 */ 1019 void ntfs_get_wsl_perm(struct inode *inode) 1020 { 1021 size_t sz; 1022 __le32 value[3]; 1023 1024 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 1025 sizeof(value[0]), &sz) == sizeof(value[0]) && 1026 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 1027 sizeof(value[1]), &sz) == sizeof(value[1]) && 1028 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 1029 sizeof(value[2]), &sz) == sizeof(value[2])) { 1030 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1031 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1032 inode->i_mode = le32_to_cpu(value[2]); 1033 1034 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1035 &value[0], sizeof(value), 1036 &sz) == sizeof(value[0])) { 1037 inode->i_rdev = le32_to_cpu(value[0]); 1038 } 1039 } 1040 } 1041 1042 static bool ntfs_xattr_user_list(struct dentry *dentry) 1043 { 1044 return true; 1045 } 1046 1047 // clang-format off 1048 static const struct xattr_handler ntfs_other_xattr_handler = { 1049 .prefix = "", 1050 .get = ntfs_getxattr, 1051 .set = ntfs_setxattr, 1052 .list = ntfs_xattr_user_list, 1053 }; 1054 1055 const struct xattr_handler * const ntfs_xattr_handlers[] = { 1056 &ntfs_other_xattr_handler, 1057 NULL, 1058 }; 1059 // clang-format on 1060