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 const struct EA_FULL *ea; 199 u32 off, size; 200 int err; 201 int ea_size; 202 size_t ret; 203 204 err = ntfs_read_ea(ni, &ea_all, 0, &info); 205 if (err) 206 return err; 207 208 if (!info || !ea_all) 209 return 0; 210 211 size = le32_to_cpu(info->size); 212 213 /* Enumerate all xattrs. */ 214 ret = 0; 215 for (off = 0; off + sizeof(struct EA_FULL) < size; off += ea_size) { 216 ea = Add2Ptr(ea_all, off); 217 ea_size = unpacked_ea_size(ea); 218 219 if (!ea->name_len) 220 break; 221 222 if (ea->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 + ea->name_len + 1 > bytes_per_buffer) { 234 err = -ERANGE; 235 goto out; 236 } 237 238 memcpy(buffer + ret, ea->name, ea->name_len); 239 buffer[ret + ea->name_len] = 0; 240 } 241 242 ret += ea->name_len + 1; 243 } 244 245 out: 246 kfree(ea_all); 247 return err ? err : ret; 248 } 249 250 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len, 251 void *buffer, size_t size, size_t *required) 252 { 253 struct ntfs_inode *ni = ntfs_i(inode); 254 const struct EA_INFO *info; 255 struct EA_FULL *ea_all = NULL; 256 const struct EA_FULL *ea; 257 u32 off, len; 258 int err; 259 260 if (!(ni->ni_flags & NI_FLAG_EA)) 261 return -ENODATA; 262 263 if (!required) 264 ni_lock(ni); 265 266 len = 0; 267 268 if (name_len > 255) { 269 err = -ENAMETOOLONG; 270 goto out; 271 } 272 273 err = ntfs_read_ea(ni, &ea_all, 0, &info); 274 if (err) 275 goto out; 276 277 if (!info) 278 goto out; 279 280 /* Enumerate all xattrs. */ 281 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off, 282 NULL)) { 283 err = -ENODATA; 284 goto out; 285 } 286 ea = Add2Ptr(ea_all, off); 287 288 len = le16_to_cpu(ea->elength); 289 if (!buffer) { 290 err = 0; 291 goto out; 292 } 293 294 if (len > size) { 295 err = -ERANGE; 296 if (required) 297 *required = len; 298 goto out; 299 } 300 301 memcpy(buffer, ea->name + ea->name_len + 1, len); 302 err = 0; 303 304 out: 305 kfree(ea_all); 306 if (!required) 307 ni_unlock(ni); 308 309 return err ? err : len; 310 } 311 312 static noinline int ntfs_set_ea(struct inode *inode, const char *name, 313 size_t name_len, const void *value, 314 size_t val_size, int flags, bool locked, 315 __le16 *ea_size) 316 { 317 struct ntfs_inode *ni = ntfs_i(inode); 318 struct ntfs_sb_info *sbi = ni->mi.sbi; 319 int err; 320 struct EA_INFO ea_info; 321 const struct EA_INFO *info; 322 struct EA_FULL *new_ea; 323 struct EA_FULL *ea_all = NULL; 324 size_t add, new_pack; 325 u32 off, size, ea_sz; 326 __le16 size_pack; 327 struct ATTRIB *attr; 328 struct ATTR_LIST_ENTRY *le; 329 struct mft_inode *mi; 330 struct runs_tree ea_run; 331 u64 new_sz; 332 void *p; 333 334 if (!locked) 335 ni_lock(ni); 336 337 run_init(&ea_run); 338 339 if (name_len > 255) { 340 err = -ENAMETOOLONG; 341 goto out; 342 } 343 344 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 345 346 err = ntfs_read_ea(ni, &ea_all, add, &info); 347 if (err) 348 goto out; 349 350 if (!info) { 351 memset(&ea_info, 0, sizeof(ea_info)); 352 size = 0; 353 size_pack = 0; 354 } else { 355 memcpy(&ea_info, info, sizeof(ea_info)); 356 size = le32_to_cpu(ea_info.size); 357 size_pack = ea_info.size_pack; 358 } 359 360 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) { 361 struct EA_FULL *ea; 362 363 if (flags & XATTR_CREATE) { 364 err = -EEXIST; 365 goto out; 366 } 367 368 ea = Add2Ptr(ea_all, off); 369 370 /* 371 * Check simple case when we try to insert xattr with the same value 372 * e.g. ntfs_save_wsl_perm 373 */ 374 if (val_size && le16_to_cpu(ea->elength) == val_size && 375 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 376 /* xattr already contains the required value. */ 377 goto out; 378 } 379 380 /* Remove current xattr. */ 381 if (ea->flags & FILE_NEED_EA) 382 le16_add_cpu(&ea_info.count, -1); 383 384 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 385 386 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 387 388 size -= ea_sz; 389 memset(Add2Ptr(ea_all, size), 0, ea_sz); 390 391 ea_info.size = cpu_to_le32(size); 392 393 if ((flags & XATTR_REPLACE) && !val_size) { 394 /* Remove xattr. */ 395 goto update_ea; 396 } 397 } else { 398 if (flags & XATTR_REPLACE) { 399 err = -ENODATA; 400 goto out; 401 } 402 403 if (!ea_all) { 404 ea_all = kzalloc(add, GFP_NOFS); 405 if (!ea_all) { 406 err = -ENOMEM; 407 goto out; 408 } 409 } 410 } 411 412 /* Append new xattr. */ 413 new_ea = Add2Ptr(ea_all, size); 414 new_ea->size = cpu_to_le32(add); 415 new_ea->flags = 0; 416 new_ea->name_len = name_len; 417 new_ea->elength = cpu_to_le16(val_size); 418 memcpy(new_ea->name, name, name_len); 419 new_ea->name[name_len] = 0; 420 memcpy(new_ea->name + name_len + 1, value, val_size); 421 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 422 ea_info.size_pack = cpu_to_le16(new_pack); 423 /* New size of ATTR_EA. */ 424 size += add; 425 ea_info.size = cpu_to_le32(size); 426 427 /* 428 * 1. Check ea_info.size_pack for overflow. 429 * 2. New attribute size must fit value from $AttrDef 430 */ 431 if (new_pack > 0xffff || size > sbi->ea_max_size) { 432 ntfs_inode_warn( 433 inode, 434 "The size of extended attributes must not exceed 64KiB"); 435 err = -EFBIG; // -EINVAL? 436 goto out; 437 } 438 439 update_ea: 440 441 if (!info) { 442 /* Create xattr. */ 443 if (!size) { 444 err = 0; 445 goto out; 446 } 447 448 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 449 ATTR_EA_INFO, NULL, 0, NULL, NULL, 450 NULL); 451 if (err) 452 goto out; 453 454 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 455 NULL); 456 if (err) 457 goto out; 458 } 459 460 new_sz = size; 461 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 462 false, NULL); 463 if (err) 464 goto out; 465 466 le = NULL; 467 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 468 if (!attr) { 469 err = -EINVAL; 470 goto out; 471 } 472 473 if (!size) { 474 /* Delete xattr, ATTR_EA_INFO */ 475 ni_remove_attr_le(ni, attr, mi, le); 476 } else { 477 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 478 if (!p) { 479 err = -EINVAL; 480 goto out; 481 } 482 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 483 mi->dirty = true; 484 } 485 486 le = NULL; 487 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 488 if (!attr) { 489 err = -EINVAL; 490 goto out; 491 } 492 493 if (!size) { 494 /* Delete xattr, ATTR_EA */ 495 ni_remove_attr_le(ni, attr, mi, le); 496 } else if (attr->non_res) { 497 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0, 498 size); 499 if (err) 500 goto out; 501 502 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 503 if (err) 504 goto out; 505 } else { 506 p = resident_data_ex(attr, size); 507 if (!p) { 508 err = -EINVAL; 509 goto out; 510 } 511 memcpy(p, ea_all, size); 512 mi->dirty = true; 513 } 514 515 /* Check if we delete the last xattr. */ 516 if (size) 517 ni->ni_flags |= NI_FLAG_EA; 518 else 519 ni->ni_flags &= ~NI_FLAG_EA; 520 521 if (ea_info.size_pack != size_pack) 522 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 523 if (ea_size) 524 *ea_size = ea_info.size_pack; 525 mark_inode_dirty(&ni->vfs_inode); 526 527 out: 528 if (!locked) 529 ni_unlock(ni); 530 531 run_close(&ea_run); 532 kfree(ea_all); 533 534 return err; 535 } 536 537 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 538 539 /* 540 * ntfs_get_acl - inode_operations::get_acl 541 */ 542 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, 543 int type) 544 { 545 struct inode *inode = d_inode(dentry); 546 struct ntfs_inode *ni = ntfs_i(inode); 547 const char *name; 548 size_t name_len; 549 struct posix_acl *acl; 550 size_t req; 551 int err; 552 void *buf; 553 554 /* Allocate PATH_MAX bytes. */ 555 buf = __getname(); 556 if (!buf) 557 return ERR_PTR(-ENOMEM); 558 559 /* Possible values of 'type' was already checked above. */ 560 if (type == ACL_TYPE_ACCESS) { 561 name = XATTR_NAME_POSIX_ACL_ACCESS; 562 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 563 } else { 564 name = XATTR_NAME_POSIX_ACL_DEFAULT; 565 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 566 } 567 568 ni_lock(ni); 569 570 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 571 572 ni_unlock(ni); 573 574 /* Translate extended attribute to acl. */ 575 if (err >= 0) { 576 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 577 } else if (err == -ENODATA) { 578 acl = NULL; 579 } else { 580 acl = ERR_PTR(err); 581 } 582 583 if (!IS_ERR(acl)) 584 set_cached_acl(inode, type, acl); 585 586 __putname(buf); 587 588 return acl; 589 } 590 591 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, 592 struct inode *inode, struct posix_acl *acl, 593 int type, bool init_acl) 594 { 595 const char *name; 596 size_t size, name_len; 597 void *value; 598 int err; 599 int flags; 600 umode_t mode; 601 602 if (S_ISLNK(inode->i_mode)) 603 return -EOPNOTSUPP; 604 605 mode = inode->i_mode; 606 switch (type) { 607 case ACL_TYPE_ACCESS: 608 /* Do not change i_mode if we are in init_acl */ 609 if (acl && !init_acl) { 610 err = posix_acl_update_mode(idmap, inode, &mode, &acl); 611 if (err) 612 return err; 613 } 614 name = XATTR_NAME_POSIX_ACL_ACCESS; 615 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 616 break; 617 618 case ACL_TYPE_DEFAULT: 619 if (!S_ISDIR(inode->i_mode)) 620 return acl ? -EACCES : 0; 621 name = XATTR_NAME_POSIX_ACL_DEFAULT; 622 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 623 break; 624 625 default: 626 return -EINVAL; 627 } 628 629 if (!acl) { 630 /* Remove xattr if it can be presented via mode. */ 631 size = 0; 632 value = NULL; 633 flags = XATTR_REPLACE; 634 } else { 635 size = posix_acl_xattr_size(acl->a_count); 636 value = kmalloc(size, GFP_NOFS); 637 if (!value) 638 return -ENOMEM; 639 err = posix_acl_to_xattr(&init_user_ns, acl, value, size); 640 if (err < 0) 641 goto out; 642 flags = 0; 643 } 644 645 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL); 646 if (err == -ENODATA && !size) 647 err = 0; /* Removing non existed xattr. */ 648 if (!err) { 649 set_cached_acl(inode, type, acl); 650 inode->i_mode = mode; 651 inode_set_ctime_current(inode); 652 mark_inode_dirty(inode); 653 } 654 655 out: 656 kfree(value); 657 658 return err; 659 } 660 661 /* 662 * ntfs_set_acl - inode_operations::set_acl 663 */ 664 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 665 struct posix_acl *acl, int type) 666 { 667 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); 668 } 669 670 /* 671 * ntfs_init_acl - Initialize the ACLs of a new inode. 672 * 673 * Called from ntfs_create_inode(). 674 */ 675 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, 676 struct inode *dir) 677 { 678 struct posix_acl *default_acl, *acl; 679 int err; 680 681 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 682 if (err) 683 return err; 684 685 if (default_acl) { 686 err = ntfs_set_acl_ex(idmap, inode, default_acl, 687 ACL_TYPE_DEFAULT, true); 688 posix_acl_release(default_acl); 689 } else { 690 inode->i_default_acl = NULL; 691 } 692 693 if (acl) { 694 if (!err) 695 err = ntfs_set_acl_ex(idmap, inode, acl, 696 ACL_TYPE_ACCESS, true); 697 posix_acl_release(acl); 698 } else { 699 inode->i_acl = NULL; 700 } 701 702 return err; 703 } 704 #endif 705 706 /* 707 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 708 */ 709 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry) 710 { 711 struct inode *inode = d_inode(dentry); 712 struct super_block *sb = inode->i_sb; 713 714 if (!(sb->s_flags & SB_POSIXACL)) 715 return 0; 716 717 if (S_ISLNK(inode->i_mode)) 718 return -EOPNOTSUPP; 719 720 return posix_acl_chmod(idmap, dentry, inode->i_mode); 721 } 722 723 /* 724 * ntfs_listxattr - inode_operations::listxattr 725 */ 726 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 727 { 728 struct inode *inode = d_inode(dentry); 729 struct ntfs_inode *ni = ntfs_i(inode); 730 ssize_t ret; 731 732 if (!(ni->ni_flags & NI_FLAG_EA)) { 733 /* no xattr in file */ 734 return 0; 735 } 736 737 ni_lock(ni); 738 739 ret = ntfs_list_ea(ni, buffer, size); 740 741 ni_unlock(ni); 742 743 return ret; 744 } 745 746 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 747 struct inode *inode, const char *name, void *buffer, 748 size_t size) 749 { 750 int err; 751 struct ntfs_inode *ni = ntfs_i(inode); 752 753 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 754 return -EIO; 755 756 /* Dispatch request. */ 757 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 758 /* system.dos_attrib */ 759 if (!buffer) { 760 err = sizeof(u8); 761 } else if (size < sizeof(u8)) { 762 err = -ENODATA; 763 } else { 764 err = sizeof(u8); 765 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 766 } 767 goto out; 768 } 769 770 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 771 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 772 /* system.ntfs_attrib */ 773 if (!buffer) { 774 err = sizeof(u32); 775 } else if (size < sizeof(u32)) { 776 err = -ENODATA; 777 } else { 778 err = sizeof(u32); 779 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 780 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 781 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer); 782 } 783 goto out; 784 } 785 786 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 787 /* system.ntfs_security*/ 788 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 789 size_t sd_size = 0; 790 791 if (!is_ntfs3(ni->mi.sbi)) { 792 /* We should get nt4 security. */ 793 err = -EINVAL; 794 goto out; 795 } else if (le32_to_cpu(ni->std_security_id) < 796 SECURITY_ID_FIRST) { 797 err = -ENOENT; 798 goto out; 799 } 800 801 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 802 &sd, &sd_size); 803 if (err) 804 goto out; 805 806 if (!is_sd_valid(sd, sd_size)) { 807 ntfs_inode_warn( 808 inode, 809 "looks like you get incorrect security descriptor id=%u", 810 ni->std_security_id); 811 } 812 813 if (!buffer) { 814 err = sd_size; 815 } else if (size < sd_size) { 816 err = -ENODATA; 817 } else { 818 err = sd_size; 819 memcpy(buffer, sd, sd_size); 820 } 821 kfree(sd); 822 goto out; 823 } 824 825 /* Deal with NTFS extended attribute. */ 826 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL); 827 828 out: 829 return err; 830 } 831 832 /* 833 * ntfs_setxattr - inode_operations::setxattr 834 */ 835 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 836 struct mnt_idmap *idmap, struct dentry *de, 837 struct inode *inode, const char *name, 838 const void *value, size_t size, int flags) 839 { 840 int err = -EINVAL; 841 struct ntfs_inode *ni = ntfs_i(inode); 842 enum FILE_ATTRIBUTE new_fa; 843 844 /* Dispatch request. */ 845 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 846 if (sizeof(u8) != size) 847 goto out; 848 new_fa = cpu_to_le32(*(u8 *)value); 849 goto set_new_fa; 850 } 851 852 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 853 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 854 if (size != sizeof(u32)) 855 goto out; 856 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 857 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value)); 858 else 859 new_fa = cpu_to_le32(*(u32 *)value); 860 861 if (S_ISREG(inode->i_mode)) { 862 /* Process compressed/sparsed in special way. */ 863 ni_lock(ni); 864 err = ni_new_attr_flags(ni, new_fa); 865 ni_unlock(ni); 866 if (err) 867 goto out; 868 } 869 set_new_fa: 870 /* 871 * Thanks Mark Harmstone: 872 * Keep directory bit consistency. 873 */ 874 if (S_ISDIR(inode->i_mode)) 875 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 876 else 877 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 878 879 if (ni->std_fa != new_fa) { 880 ni->std_fa = new_fa; 881 if (new_fa & FILE_ATTRIBUTE_READONLY) 882 inode->i_mode &= ~0222; 883 else 884 inode->i_mode |= 0222; 885 /* Std attribute always in primary record. */ 886 ni->mi.dirty = true; 887 mark_inode_dirty(inode); 888 } 889 err = 0; 890 891 goto out; 892 } 893 894 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 895 /* system.ntfs_security*/ 896 __le32 security_id; 897 bool inserted; 898 struct ATTR_STD_INFO5 *std; 899 900 if (!is_ntfs3(ni->mi.sbi)) { 901 /* 902 * We should replace ATTR_SECURE. 903 * Skip this way cause it is nt4 feature. 904 */ 905 err = -EINVAL; 906 goto out; 907 } 908 909 if (!is_sd_valid(value, size)) { 910 err = -EINVAL; 911 ntfs_inode_warn( 912 inode, 913 "you try to set invalid security descriptor"); 914 goto out; 915 } 916 917 err = ntfs_insert_security(ni->mi.sbi, value, size, 918 &security_id, &inserted); 919 if (err) 920 goto out; 921 922 ni_lock(ni); 923 std = ni_std5(ni); 924 if (!std) { 925 err = -EINVAL; 926 } else if (std->security_id != security_id) { 927 std->security_id = ni->std_security_id = security_id; 928 /* Std attribute always in primary record. */ 929 ni->mi.dirty = true; 930 mark_inode_dirty(&ni->vfs_inode); 931 } 932 ni_unlock(ni); 933 goto out; 934 } 935 936 /* Deal with NTFS extended attribute. */ 937 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0, 938 NULL); 939 940 out: 941 inode_set_ctime_current(inode); 942 mark_inode_dirty(inode); 943 944 return err; 945 } 946 947 /* 948 * ntfs_save_wsl_perm 949 * 950 * save uid/gid/mode in xattr 951 */ 952 int ntfs_save_wsl_perm(struct inode *inode, __le16 *ea_size) 953 { 954 int err; 955 __le32 value; 956 struct ntfs_inode *ni = ntfs_i(inode); 957 958 ni_lock(ni); 959 value = cpu_to_le32(i_uid_read(inode)); 960 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 961 sizeof(value), 0, true, ea_size); 962 if (err) 963 goto out; 964 965 value = cpu_to_le32(i_gid_read(inode)); 966 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 967 sizeof(value), 0, true, ea_size); 968 if (err) 969 goto out; 970 971 value = cpu_to_le32(inode->i_mode); 972 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 973 sizeof(value), 0, true, ea_size); 974 if (err) 975 goto out; 976 977 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 978 value = cpu_to_le32(inode->i_rdev); 979 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 980 sizeof(value), 0, true, ea_size); 981 if (err) 982 goto out; 983 } 984 985 out: 986 ni_unlock(ni); 987 /* In case of error should we delete all WSL xattr? */ 988 return err; 989 } 990 991 /* 992 * ntfs_get_wsl_perm 993 * 994 * get uid/gid/mode from xattr 995 * it is called from ntfs_iget5->ntfs_read_mft 996 */ 997 void ntfs_get_wsl_perm(struct inode *inode) 998 { 999 size_t sz; 1000 __le32 value[3]; 1001 1002 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 1003 sizeof(value[0]), &sz) == sizeof(value[0]) && 1004 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 1005 sizeof(value[1]), &sz) == sizeof(value[1]) && 1006 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 1007 sizeof(value[2]), &sz) == sizeof(value[2])) { 1008 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1009 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1010 inode->i_mode = le32_to_cpu(value[2]); 1011 1012 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1013 &value[0], sizeof(value), 1014 &sz) == sizeof(value[0])) { 1015 inode->i_rdev = le32_to_cpu(value[0]); 1016 } 1017 } 1018 } 1019 1020 static bool ntfs_xattr_user_list(struct dentry *dentry) 1021 { 1022 return true; 1023 } 1024 1025 // clang-format off 1026 static const struct xattr_handler ntfs_other_xattr_handler = { 1027 .prefix = "", 1028 .get = ntfs_getxattr, 1029 .set = ntfs_setxattr, 1030 .list = ntfs_xattr_user_list, 1031 }; 1032 1033 const struct xattr_handler *ntfs_xattr_handlers[] = { 1034 &ntfs_other_xattr_handler, 1035 NULL, 1036 }; 1037 // clang-format on 1038