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 (buffer) { 223 /* Check if we can use field ea->name */ 224 if (off + ea_size > size) 225 break; 226 227 if (ret + ea->name_len + 1 > bytes_per_buffer) { 228 err = -ERANGE; 229 goto out; 230 } 231 232 memcpy(buffer + ret, ea->name, ea->name_len); 233 buffer[ret + ea->name_len] = 0; 234 } 235 236 ret += ea->name_len + 1; 237 } 238 239 out: 240 kfree(ea_all); 241 return err ? err : ret; 242 } 243 244 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len, 245 void *buffer, size_t size, size_t *required) 246 { 247 struct ntfs_inode *ni = ntfs_i(inode); 248 const struct EA_INFO *info; 249 struct EA_FULL *ea_all = NULL; 250 const struct EA_FULL *ea; 251 u32 off, len; 252 int err; 253 254 if (!(ni->ni_flags & NI_FLAG_EA)) 255 return -ENODATA; 256 257 if (!required) 258 ni_lock(ni); 259 260 len = 0; 261 262 if (name_len > 255) { 263 err = -ENAMETOOLONG; 264 goto out; 265 } 266 267 err = ntfs_read_ea(ni, &ea_all, 0, &info); 268 if (err) 269 goto out; 270 271 if (!info) 272 goto out; 273 274 /* Enumerate all xattrs. */ 275 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off, 276 NULL)) { 277 err = -ENODATA; 278 goto out; 279 } 280 ea = Add2Ptr(ea_all, off); 281 282 len = le16_to_cpu(ea->elength); 283 if (!buffer) { 284 err = 0; 285 goto out; 286 } 287 288 if (len > size) { 289 err = -ERANGE; 290 if (required) 291 *required = len; 292 goto out; 293 } 294 295 memcpy(buffer, ea->name + ea->name_len + 1, len); 296 err = 0; 297 298 out: 299 kfree(ea_all); 300 if (!required) 301 ni_unlock(ni); 302 303 return err ? err : len; 304 } 305 306 static noinline int ntfs_set_ea(struct inode *inode, const char *name, 307 size_t name_len, const void *value, 308 size_t val_size, int flags, bool locked, 309 __le16 *ea_size) 310 { 311 struct ntfs_inode *ni = ntfs_i(inode); 312 struct ntfs_sb_info *sbi = ni->mi.sbi; 313 int err; 314 struct EA_INFO ea_info; 315 const struct EA_INFO *info; 316 struct EA_FULL *new_ea; 317 struct EA_FULL *ea_all = NULL; 318 size_t add, new_pack; 319 u32 off, size, ea_sz; 320 __le16 size_pack; 321 struct ATTRIB *attr; 322 struct ATTR_LIST_ENTRY *le; 323 struct mft_inode *mi; 324 struct runs_tree ea_run; 325 u64 new_sz; 326 void *p; 327 328 if (!locked) 329 ni_lock(ni); 330 331 run_init(&ea_run); 332 333 if (name_len > 255) { 334 err = -ENAMETOOLONG; 335 goto out; 336 } 337 338 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 339 340 err = ntfs_read_ea(ni, &ea_all, add, &info); 341 if (err) 342 goto out; 343 344 if (!info) { 345 memset(&ea_info, 0, sizeof(ea_info)); 346 size = 0; 347 size_pack = 0; 348 } else { 349 memcpy(&ea_info, info, sizeof(ea_info)); 350 size = le32_to_cpu(ea_info.size); 351 size_pack = ea_info.size_pack; 352 } 353 354 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) { 355 struct EA_FULL *ea; 356 357 if (flags & XATTR_CREATE) { 358 err = -EEXIST; 359 goto out; 360 } 361 362 ea = Add2Ptr(ea_all, off); 363 364 /* 365 * Check simple case when we try to insert xattr with the same value 366 * e.g. ntfs_save_wsl_perm 367 */ 368 if (val_size && le16_to_cpu(ea->elength) == val_size && 369 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 370 /* xattr already contains the required value. */ 371 goto out; 372 } 373 374 /* Remove current xattr. */ 375 if (ea->flags & FILE_NEED_EA) 376 le16_add_cpu(&ea_info.count, -1); 377 378 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 379 380 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 381 382 size -= ea_sz; 383 memset(Add2Ptr(ea_all, size), 0, ea_sz); 384 385 ea_info.size = cpu_to_le32(size); 386 387 if ((flags & XATTR_REPLACE) && !val_size) { 388 /* Remove xattr. */ 389 goto update_ea; 390 } 391 } else { 392 if (flags & XATTR_REPLACE) { 393 err = -ENODATA; 394 goto out; 395 } 396 397 if (!ea_all) { 398 ea_all = kzalloc(add, GFP_NOFS); 399 if (!ea_all) { 400 err = -ENOMEM; 401 goto out; 402 } 403 } 404 } 405 406 /* Append new xattr. */ 407 new_ea = Add2Ptr(ea_all, size); 408 new_ea->size = cpu_to_le32(add); 409 new_ea->flags = 0; 410 new_ea->name_len = name_len; 411 new_ea->elength = cpu_to_le16(val_size); 412 memcpy(new_ea->name, name, name_len); 413 new_ea->name[name_len] = 0; 414 memcpy(new_ea->name + name_len + 1, value, val_size); 415 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 416 ea_info.size_pack = cpu_to_le16(new_pack); 417 /* New size of ATTR_EA. */ 418 size += add; 419 ea_info.size = cpu_to_le32(size); 420 421 /* 422 * 1. Check ea_info.size_pack for overflow. 423 * 2. New attribute size must fit value from $AttrDef 424 */ 425 if (new_pack > 0xffff || size > sbi->ea_max_size) { 426 ntfs_inode_warn( 427 inode, 428 "The size of extended attributes must not exceed 64KiB"); 429 err = -EFBIG; // -EINVAL? 430 goto out; 431 } 432 433 update_ea: 434 435 if (!info) { 436 /* Create xattr. */ 437 if (!size) { 438 err = 0; 439 goto out; 440 } 441 442 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 443 ATTR_EA_INFO, NULL, 0, NULL, NULL, 444 NULL); 445 if (err) 446 goto out; 447 448 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 449 NULL); 450 if (err) 451 goto out; 452 } 453 454 new_sz = size; 455 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 456 false, NULL); 457 if (err) 458 goto out; 459 460 le = NULL; 461 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 462 if (!attr) { 463 err = -EINVAL; 464 goto out; 465 } 466 467 if (!size) { 468 /* Delete xattr, ATTR_EA_INFO */ 469 ni_remove_attr_le(ni, attr, mi, le); 470 } else { 471 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 472 if (!p) { 473 err = -EINVAL; 474 goto out; 475 } 476 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 477 mi->dirty = true; 478 } 479 480 le = NULL; 481 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 482 if (!attr) { 483 err = -EINVAL; 484 goto out; 485 } 486 487 if (!size) { 488 /* Delete xattr, ATTR_EA */ 489 ni_remove_attr_le(ni, attr, mi, le); 490 } else if (attr->non_res) { 491 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0, 492 size); 493 if (err) 494 goto out; 495 496 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 497 if (err) 498 goto out; 499 } else { 500 p = resident_data_ex(attr, size); 501 if (!p) { 502 err = -EINVAL; 503 goto out; 504 } 505 memcpy(p, ea_all, size); 506 mi->dirty = true; 507 } 508 509 /* Check if we delete the last xattr. */ 510 if (size) 511 ni->ni_flags |= NI_FLAG_EA; 512 else 513 ni->ni_flags &= ~NI_FLAG_EA; 514 515 if (ea_info.size_pack != size_pack) 516 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 517 if (ea_size) 518 *ea_size = ea_info.size_pack; 519 mark_inode_dirty(&ni->vfs_inode); 520 521 out: 522 if (!locked) 523 ni_unlock(ni); 524 525 run_close(&ea_run); 526 kfree(ea_all); 527 528 return err; 529 } 530 531 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 532 533 /* 534 * ntfs_get_acl - inode_operations::get_acl 535 */ 536 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, 537 int type) 538 { 539 struct inode *inode = d_inode(dentry); 540 struct ntfs_inode *ni = ntfs_i(inode); 541 const char *name; 542 size_t name_len; 543 struct posix_acl *acl; 544 size_t req; 545 int err; 546 void *buf; 547 548 /* Allocate PATH_MAX bytes. */ 549 buf = __getname(); 550 if (!buf) 551 return ERR_PTR(-ENOMEM); 552 553 /* Possible values of 'type' was already checked above. */ 554 if (type == ACL_TYPE_ACCESS) { 555 name = XATTR_NAME_POSIX_ACL_ACCESS; 556 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 557 } else { 558 name = XATTR_NAME_POSIX_ACL_DEFAULT; 559 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 560 } 561 562 ni_lock(ni); 563 564 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 565 566 ni_unlock(ni); 567 568 /* Translate extended attribute to acl. */ 569 if (err >= 0) { 570 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 571 } else if (err == -ENODATA) { 572 acl = NULL; 573 } else { 574 acl = ERR_PTR(err); 575 } 576 577 if (!IS_ERR(acl)) 578 set_cached_acl(inode, type, acl); 579 580 __putname(buf); 581 582 return acl; 583 } 584 585 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, 586 struct inode *inode, struct posix_acl *acl, 587 int type, bool init_acl) 588 { 589 const char *name; 590 size_t size, name_len; 591 void *value; 592 int err; 593 int flags; 594 umode_t mode; 595 596 if (S_ISLNK(inode->i_mode)) 597 return -EOPNOTSUPP; 598 599 mode = inode->i_mode; 600 switch (type) { 601 case ACL_TYPE_ACCESS: 602 /* Do not change i_mode if we are in init_acl */ 603 if (acl && !init_acl) { 604 err = posix_acl_update_mode(idmap, inode, &mode, &acl); 605 if (err) 606 return err; 607 } 608 name = XATTR_NAME_POSIX_ACL_ACCESS; 609 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 610 break; 611 612 case ACL_TYPE_DEFAULT: 613 if (!S_ISDIR(inode->i_mode)) 614 return acl ? -EACCES : 0; 615 name = XATTR_NAME_POSIX_ACL_DEFAULT; 616 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 617 break; 618 619 default: 620 return -EINVAL; 621 } 622 623 if (!acl) { 624 /* Remove xattr if it can be presented via mode. */ 625 size = 0; 626 value = NULL; 627 flags = XATTR_REPLACE; 628 } else { 629 size = posix_acl_xattr_size(acl->a_count); 630 value = kmalloc(size, GFP_NOFS); 631 if (!value) 632 return -ENOMEM; 633 err = posix_acl_to_xattr(&init_user_ns, acl, value, size); 634 if (err < 0) 635 goto out; 636 flags = 0; 637 } 638 639 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL); 640 if (err == -ENODATA && !size) 641 err = 0; /* Removing non existed xattr. */ 642 if (!err) { 643 set_cached_acl(inode, type, acl); 644 inode->i_mode = mode; 645 inode_set_ctime_current(inode); 646 mark_inode_dirty(inode); 647 } 648 649 out: 650 kfree(value); 651 652 return err; 653 } 654 655 /* 656 * ntfs_set_acl - inode_operations::set_acl 657 */ 658 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 659 struct posix_acl *acl, int type) 660 { 661 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); 662 } 663 664 /* 665 * ntfs_init_acl - Initialize the ACLs of a new inode. 666 * 667 * Called from ntfs_create_inode(). 668 */ 669 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, 670 struct inode *dir) 671 { 672 struct posix_acl *default_acl, *acl; 673 int err; 674 675 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 676 if (err) 677 return err; 678 679 if (default_acl) { 680 err = ntfs_set_acl_ex(idmap, inode, default_acl, 681 ACL_TYPE_DEFAULT, true); 682 posix_acl_release(default_acl); 683 } else { 684 inode->i_default_acl = NULL; 685 } 686 687 if (acl) { 688 if (!err) 689 err = ntfs_set_acl_ex(idmap, inode, acl, 690 ACL_TYPE_ACCESS, true); 691 posix_acl_release(acl); 692 } else { 693 inode->i_acl = NULL; 694 } 695 696 return err; 697 } 698 #endif 699 700 /* 701 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 702 */ 703 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry) 704 { 705 struct inode *inode = d_inode(dentry); 706 struct super_block *sb = inode->i_sb; 707 708 if (!(sb->s_flags & SB_POSIXACL)) 709 return 0; 710 711 if (S_ISLNK(inode->i_mode)) 712 return -EOPNOTSUPP; 713 714 return posix_acl_chmod(idmap, dentry, inode->i_mode); 715 } 716 717 /* 718 * ntfs_listxattr - inode_operations::listxattr 719 */ 720 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 721 { 722 struct inode *inode = d_inode(dentry); 723 struct ntfs_inode *ni = ntfs_i(inode); 724 ssize_t ret; 725 726 if (!(ni->ni_flags & NI_FLAG_EA)) { 727 /* no xattr in file */ 728 return 0; 729 } 730 731 ni_lock(ni); 732 733 ret = ntfs_list_ea(ni, buffer, size); 734 735 ni_unlock(ni); 736 737 return ret; 738 } 739 740 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 741 struct inode *inode, const char *name, void *buffer, 742 size_t size) 743 { 744 int err; 745 struct ntfs_inode *ni = ntfs_i(inode); 746 747 /* Dispatch request. */ 748 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 749 /* system.dos_attrib */ 750 if (!buffer) { 751 err = sizeof(u8); 752 } else if (size < sizeof(u8)) { 753 err = -ENODATA; 754 } else { 755 err = sizeof(u8); 756 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 757 } 758 goto out; 759 } 760 761 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 762 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 763 /* system.ntfs_attrib */ 764 if (!buffer) { 765 err = sizeof(u32); 766 } else if (size < sizeof(u32)) { 767 err = -ENODATA; 768 } else { 769 err = sizeof(u32); 770 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 771 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 772 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer); 773 } 774 goto out; 775 } 776 777 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 778 /* system.ntfs_security*/ 779 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 780 size_t sd_size = 0; 781 782 if (!is_ntfs3(ni->mi.sbi)) { 783 /* We should get nt4 security. */ 784 err = -EINVAL; 785 goto out; 786 } else if (le32_to_cpu(ni->std_security_id) < 787 SECURITY_ID_FIRST) { 788 err = -ENOENT; 789 goto out; 790 } 791 792 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 793 &sd, &sd_size); 794 if (err) 795 goto out; 796 797 if (!is_sd_valid(sd, sd_size)) { 798 ntfs_inode_warn( 799 inode, 800 "looks like you get incorrect security descriptor id=%u", 801 ni->std_security_id); 802 } 803 804 if (!buffer) { 805 err = sd_size; 806 } else if (size < sd_size) { 807 err = -ENODATA; 808 } else { 809 err = sd_size; 810 memcpy(buffer, sd, sd_size); 811 } 812 kfree(sd); 813 goto out; 814 } 815 816 /* Deal with NTFS extended attribute. */ 817 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL); 818 819 out: 820 return err; 821 } 822 823 /* 824 * ntfs_setxattr - inode_operations::setxattr 825 */ 826 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 827 struct mnt_idmap *idmap, struct dentry *de, 828 struct inode *inode, const char *name, 829 const void *value, size_t size, int flags) 830 { 831 int err = -EINVAL; 832 struct ntfs_inode *ni = ntfs_i(inode); 833 enum FILE_ATTRIBUTE new_fa; 834 835 /* Dispatch request. */ 836 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 837 if (sizeof(u8) != size) 838 goto out; 839 new_fa = cpu_to_le32(*(u8 *)value); 840 goto set_new_fa; 841 } 842 843 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 844 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 845 if (size != sizeof(u32)) 846 goto out; 847 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 848 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value)); 849 else 850 new_fa = cpu_to_le32(*(u32 *)value); 851 852 if (S_ISREG(inode->i_mode)) { 853 /* Process compressed/sparsed in special way. */ 854 ni_lock(ni); 855 err = ni_new_attr_flags(ni, new_fa); 856 ni_unlock(ni); 857 if (err) 858 goto out; 859 } 860 set_new_fa: 861 /* 862 * Thanks Mark Harmstone: 863 * Keep directory bit consistency. 864 */ 865 if (S_ISDIR(inode->i_mode)) 866 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 867 else 868 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 869 870 if (ni->std_fa != new_fa) { 871 ni->std_fa = new_fa; 872 if (new_fa & FILE_ATTRIBUTE_READONLY) 873 inode->i_mode &= ~0222; 874 else 875 inode->i_mode |= 0222; 876 /* Std attribute always in primary record. */ 877 ni->mi.dirty = true; 878 mark_inode_dirty(inode); 879 } 880 err = 0; 881 882 goto out; 883 } 884 885 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 886 /* system.ntfs_security*/ 887 __le32 security_id; 888 bool inserted; 889 struct ATTR_STD_INFO5 *std; 890 891 if (!is_ntfs3(ni->mi.sbi)) { 892 /* 893 * We should replace ATTR_SECURE. 894 * Skip this way cause it is nt4 feature. 895 */ 896 err = -EINVAL; 897 goto out; 898 } 899 900 if (!is_sd_valid(value, size)) { 901 err = -EINVAL; 902 ntfs_inode_warn( 903 inode, 904 "you try to set invalid security descriptor"); 905 goto out; 906 } 907 908 err = ntfs_insert_security(ni->mi.sbi, value, size, 909 &security_id, &inserted); 910 if (err) 911 goto out; 912 913 ni_lock(ni); 914 std = ni_std5(ni); 915 if (!std) { 916 err = -EINVAL; 917 } else if (std->security_id != security_id) { 918 std->security_id = ni->std_security_id = security_id; 919 /* Std attribute always in primary record. */ 920 ni->mi.dirty = true; 921 mark_inode_dirty(&ni->vfs_inode); 922 } 923 ni_unlock(ni); 924 goto out; 925 } 926 927 /* Deal with NTFS extended attribute. */ 928 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0, 929 NULL); 930 931 out: 932 inode_set_ctime_current(inode); 933 mark_inode_dirty(inode); 934 935 return err; 936 } 937 938 /* 939 * ntfs_save_wsl_perm 940 * 941 * save uid/gid/mode in xattr 942 */ 943 int ntfs_save_wsl_perm(struct inode *inode, __le16 *ea_size) 944 { 945 int err; 946 __le32 value; 947 struct ntfs_inode *ni = ntfs_i(inode); 948 949 ni_lock(ni); 950 value = cpu_to_le32(i_uid_read(inode)); 951 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 952 sizeof(value), 0, true, ea_size); 953 if (err) 954 goto out; 955 956 value = cpu_to_le32(i_gid_read(inode)); 957 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 958 sizeof(value), 0, true, ea_size); 959 if (err) 960 goto out; 961 962 value = cpu_to_le32(inode->i_mode); 963 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 964 sizeof(value), 0, true, ea_size); 965 if (err) 966 goto out; 967 968 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 969 value = cpu_to_le32(inode->i_rdev); 970 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 971 sizeof(value), 0, true, ea_size); 972 if (err) 973 goto out; 974 } 975 976 out: 977 ni_unlock(ni); 978 /* In case of error should we delete all WSL xattr? */ 979 return err; 980 } 981 982 /* 983 * ntfs_get_wsl_perm 984 * 985 * get uid/gid/mode from xattr 986 * it is called from ntfs_iget5->ntfs_read_mft 987 */ 988 void ntfs_get_wsl_perm(struct inode *inode) 989 { 990 size_t sz; 991 __le32 value[3]; 992 993 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 994 sizeof(value[0]), &sz) == sizeof(value[0]) && 995 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 996 sizeof(value[1]), &sz) == sizeof(value[1]) && 997 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 998 sizeof(value[2]), &sz) == sizeof(value[2])) { 999 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1000 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1001 inode->i_mode = le32_to_cpu(value[2]); 1002 1003 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1004 &value[0], sizeof(value), 1005 &sz) == sizeof(value[0])) { 1006 inode->i_rdev = le32_to_cpu(value[0]); 1007 } 1008 } 1009 } 1010 1011 static bool ntfs_xattr_user_list(struct dentry *dentry) 1012 { 1013 return true; 1014 } 1015 1016 // clang-format off 1017 static const struct xattr_handler ntfs_other_xattr_handler = { 1018 .prefix = "", 1019 .get = ntfs_getxattr, 1020 .set = ntfs_setxattr, 1021 .list = ntfs_xattr_user_list, 1022 }; 1023 1024 const struct xattr_handler *ntfs_xattr_handlers[] = { 1025 &ntfs_other_xattr_handler, 1026 NULL, 1027 }; 1028 // clang-format on 1029