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_SECURITY "system.ntfs_security" 21 // clang-format on 22 23 static inline size_t unpacked_ea_size(const struct EA_FULL *ea) 24 { 25 return ea->size ? le32_to_cpu(ea->size) 26 : ALIGN(struct_size(ea, name, 27 1 + ea->name_len + 28 le16_to_cpu(ea->elength)), 29 4); 30 } 31 32 static inline size_t packed_ea_size(const struct EA_FULL *ea) 33 { 34 return struct_size(ea, name, 35 1 + ea->name_len + le16_to_cpu(ea->elength)) - 36 offsetof(struct EA_FULL, flags); 37 } 38 39 /* 40 * find_ea 41 * 42 * Assume there is at least one xattr in the list. 43 */ 44 static inline bool find_ea(const struct EA_FULL *ea_all, u32 bytes, 45 const char *name, u8 name_len, u32 *off) 46 { 47 *off = 0; 48 49 if (!ea_all || !bytes) 50 return false; 51 52 for (;;) { 53 const struct EA_FULL *ea = Add2Ptr(ea_all, *off); 54 u32 next_off = *off + unpacked_ea_size(ea); 55 56 if (next_off > bytes) 57 return false; 58 59 if (ea->name_len == name_len && 60 !memcmp(ea->name, name, name_len)) 61 return true; 62 63 *off = next_off; 64 if (next_off >= bytes) 65 return false; 66 } 67 } 68 69 /* 70 * ntfs_read_ea - Read all extended attributes. 71 * @ea: New allocated memory. 72 * @info: Pointer into resident data. 73 */ 74 static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea, 75 size_t add_bytes, const struct EA_INFO **info) 76 { 77 int err; 78 struct ntfs_sb_info *sbi = ni->mi.sbi; 79 struct ATTR_LIST_ENTRY *le = NULL; 80 struct ATTRIB *attr_info, *attr_ea; 81 void *ea_p; 82 u32 size; 83 84 static_assert(le32_to_cpu(ATTR_EA_INFO) < le32_to_cpu(ATTR_EA)); 85 86 *ea = NULL; 87 *info = NULL; 88 89 attr_info = 90 ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, NULL); 91 attr_ea = 92 ni_find_attr(ni, attr_info, &le, ATTR_EA, NULL, 0, NULL, NULL); 93 94 if (!attr_ea || !attr_info) 95 return 0; 96 97 *info = resident_data_ex(attr_info, sizeof(struct EA_INFO)); 98 if (!*info) 99 return -EINVAL; 100 101 /* Check Ea limit. */ 102 size = le32_to_cpu((*info)->size); 103 if (size > sbi->ea_max_size) 104 return -EFBIG; 105 106 if (attr_size(attr_ea) > sbi->ea_max_size) 107 return -EFBIG; 108 109 /* Allocate memory for packed Ea. */ 110 ea_p = kmalloc(size + add_bytes, GFP_NOFS); 111 if (!ea_p) 112 return -ENOMEM; 113 114 if (!size) { 115 ; 116 } else if (attr_ea->non_res) { 117 struct runs_tree run; 118 119 run_init(&run); 120 121 err = attr_load_runs(attr_ea, ni, &run, NULL); 122 if (!err) 123 err = ntfs_read_run_nb(sbi, &run, 0, ea_p, size, NULL); 124 run_close(&run); 125 126 if (err) 127 goto out; 128 } else { 129 void *p = resident_data_ex(attr_ea, size); 130 131 if (!p) { 132 err = -EINVAL; 133 goto out; 134 } 135 memcpy(ea_p, p, size); 136 } 137 138 memset(Add2Ptr(ea_p, size), 0, add_bytes); 139 *ea = ea_p; 140 return 0; 141 142 out: 143 kfree(ea_p); 144 *ea = NULL; 145 return err; 146 } 147 148 /* 149 * ntfs_list_ea 150 * 151 * Copy a list of xattrs names into the buffer 152 * provided, or compute the buffer size required. 153 * 154 * Return: 155 * * Number of bytes used / required on 156 * * -ERRNO - on failure 157 */ 158 static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer, 159 size_t bytes_per_buffer) 160 { 161 const struct EA_INFO *info; 162 struct EA_FULL *ea_all = NULL; 163 const struct EA_FULL *ea; 164 u32 off, size; 165 int err; 166 size_t ret; 167 168 err = ntfs_read_ea(ni, &ea_all, 0, &info); 169 if (err) 170 return err; 171 172 if (!info || !ea_all) 173 return 0; 174 175 size = le32_to_cpu(info->size); 176 177 /* Enumerate all xattrs. */ 178 for (ret = 0, off = 0; off < size; off += unpacked_ea_size(ea)) { 179 ea = Add2Ptr(ea_all, off); 180 181 if (buffer) { 182 if (ret + ea->name_len + 1 > bytes_per_buffer) { 183 err = -ERANGE; 184 goto out; 185 } 186 187 memcpy(buffer + ret, ea->name, ea->name_len); 188 buffer[ret + ea->name_len] = 0; 189 } 190 191 ret += ea->name_len + 1; 192 } 193 194 out: 195 kfree(ea_all); 196 return err ? err : ret; 197 } 198 199 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len, 200 void *buffer, size_t size, size_t *required) 201 { 202 struct ntfs_inode *ni = ntfs_i(inode); 203 const struct EA_INFO *info; 204 struct EA_FULL *ea_all = NULL; 205 const struct EA_FULL *ea; 206 u32 off, len; 207 int err; 208 209 if (!(ni->ni_flags & NI_FLAG_EA)) 210 return -ENODATA; 211 212 if (!required) 213 ni_lock(ni); 214 215 len = 0; 216 217 if (name_len > 255) { 218 err = -ENAMETOOLONG; 219 goto out; 220 } 221 222 err = ntfs_read_ea(ni, &ea_all, 0, &info); 223 if (err) 224 goto out; 225 226 if (!info) 227 goto out; 228 229 /* Enumerate all xattrs. */ 230 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off)) { 231 err = -ENODATA; 232 goto out; 233 } 234 ea = Add2Ptr(ea_all, off); 235 236 len = le16_to_cpu(ea->elength); 237 if (!buffer) { 238 err = 0; 239 goto out; 240 } 241 242 if (len > size) { 243 err = -ERANGE; 244 if (required) 245 *required = len; 246 goto out; 247 } 248 249 memcpy(buffer, ea->name + ea->name_len + 1, len); 250 err = 0; 251 252 out: 253 kfree(ea_all); 254 if (!required) 255 ni_unlock(ni); 256 257 return err ? err : len; 258 } 259 260 static noinline int ntfs_set_ea(struct inode *inode, const char *name, 261 size_t name_len, const void *value, 262 size_t val_size, int flags) 263 { 264 struct ntfs_inode *ni = ntfs_i(inode); 265 struct ntfs_sb_info *sbi = ni->mi.sbi; 266 int err; 267 struct EA_INFO ea_info; 268 const struct EA_INFO *info; 269 struct EA_FULL *new_ea; 270 struct EA_FULL *ea_all = NULL; 271 size_t add, new_pack; 272 u32 off, size; 273 __le16 size_pack; 274 struct ATTRIB *attr; 275 struct ATTR_LIST_ENTRY *le; 276 struct mft_inode *mi; 277 struct runs_tree ea_run; 278 u64 new_sz; 279 void *p; 280 281 ni_lock(ni); 282 283 run_init(&ea_run); 284 285 if (name_len > 255) { 286 err = -ENAMETOOLONG; 287 goto out; 288 } 289 290 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 291 292 err = ntfs_read_ea(ni, &ea_all, add, &info); 293 if (err) 294 goto out; 295 296 if (!info) { 297 memset(&ea_info, 0, sizeof(ea_info)); 298 size = 0; 299 size_pack = 0; 300 } else { 301 memcpy(&ea_info, info, sizeof(ea_info)); 302 size = le32_to_cpu(ea_info.size); 303 size_pack = ea_info.size_pack; 304 } 305 306 if (info && find_ea(ea_all, size, name, name_len, &off)) { 307 struct EA_FULL *ea; 308 size_t ea_sz; 309 310 if (flags & XATTR_CREATE) { 311 err = -EEXIST; 312 goto out; 313 } 314 315 ea = Add2Ptr(ea_all, off); 316 317 /* 318 * Check simple case when we try to insert xattr with the same value 319 * e.g. ntfs_save_wsl_perm 320 */ 321 if (val_size && le16_to_cpu(ea->elength) == val_size && 322 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 323 /* xattr already contains the required value. */ 324 goto out; 325 } 326 327 /* Remove current xattr. */ 328 if (ea->flags & FILE_NEED_EA) 329 le16_add_cpu(&ea_info.count, -1); 330 331 ea_sz = unpacked_ea_size(ea); 332 333 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 334 335 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 336 337 size -= ea_sz; 338 memset(Add2Ptr(ea_all, size), 0, ea_sz); 339 340 ea_info.size = cpu_to_le32(size); 341 342 if ((flags & XATTR_REPLACE) && !val_size) { 343 /* Remove xattr. */ 344 goto update_ea; 345 } 346 } else { 347 if (flags & XATTR_REPLACE) { 348 err = -ENODATA; 349 goto out; 350 } 351 352 if (!ea_all) { 353 ea_all = kzalloc(add, GFP_NOFS); 354 if (!ea_all) { 355 err = -ENOMEM; 356 goto out; 357 } 358 } 359 } 360 361 /* Append new xattr. */ 362 new_ea = Add2Ptr(ea_all, size); 363 new_ea->size = cpu_to_le32(add); 364 new_ea->flags = 0; 365 new_ea->name_len = name_len; 366 new_ea->elength = cpu_to_le16(val_size); 367 memcpy(new_ea->name, name, name_len); 368 new_ea->name[name_len] = 0; 369 memcpy(new_ea->name + name_len + 1, value, val_size); 370 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 371 ea_info.size_pack = cpu_to_le16(new_pack); 372 /* New size of ATTR_EA. */ 373 size += add; 374 ea_info.size = cpu_to_le32(size); 375 376 /* 377 * 1. Check ea_info.size_pack for overflow. 378 * 2. New attibute size must fit value from $AttrDef 379 */ 380 if (new_pack > 0xffff || size > sbi->ea_max_size) { 381 ntfs_inode_warn( 382 inode, 383 "The size of extended attributes must not exceed 64KiB"); 384 err = -EFBIG; // -EINVAL? 385 goto out; 386 } 387 388 update_ea: 389 390 if (!info) { 391 /* Create xattr. */ 392 if (!size) { 393 err = 0; 394 goto out; 395 } 396 397 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 398 ATTR_EA_INFO, NULL, 0, NULL, NULL, 399 NULL); 400 if (err) 401 goto out; 402 403 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 404 NULL); 405 if (err) 406 goto out; 407 } 408 409 new_sz = size; 410 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 411 false, NULL); 412 if (err) 413 goto out; 414 415 le = NULL; 416 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 417 if (!attr) { 418 err = -EINVAL; 419 goto out; 420 } 421 422 if (!size) { 423 /* Delete xattr, ATTR_EA_INFO */ 424 ni_remove_attr_le(ni, attr, mi, le); 425 } else { 426 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 427 if (!p) { 428 err = -EINVAL; 429 goto out; 430 } 431 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 432 mi->dirty = true; 433 } 434 435 le = NULL; 436 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 437 if (!attr) { 438 err = -EINVAL; 439 goto out; 440 } 441 442 if (!size) { 443 /* Delete xattr, ATTR_EA */ 444 ni_remove_attr_le(ni, attr, mi, le); 445 } else if (attr->non_res) { 446 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 447 if (err) 448 goto out; 449 } else { 450 p = resident_data_ex(attr, size); 451 if (!p) { 452 err = -EINVAL; 453 goto out; 454 } 455 memcpy(p, ea_all, size); 456 mi->dirty = true; 457 } 458 459 /* Check if we delete the last xattr. */ 460 if (size) 461 ni->ni_flags |= NI_FLAG_EA; 462 else 463 ni->ni_flags &= ~NI_FLAG_EA; 464 465 if (ea_info.size_pack != size_pack) 466 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 467 mark_inode_dirty(&ni->vfs_inode); 468 469 out: 470 ni_unlock(ni); 471 472 run_close(&ea_run); 473 kfree(ea_all); 474 475 return err; 476 } 477 478 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 479 static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns, 480 struct inode *inode, int type, 481 int locked) 482 { 483 struct ntfs_inode *ni = ntfs_i(inode); 484 const char *name; 485 size_t name_len; 486 struct posix_acl *acl; 487 size_t req; 488 int err; 489 void *buf; 490 491 /* Allocate PATH_MAX bytes. */ 492 buf = __getname(); 493 if (!buf) 494 return ERR_PTR(-ENOMEM); 495 496 /* Possible values of 'type' was already checked above. */ 497 if (type == ACL_TYPE_ACCESS) { 498 name = XATTR_NAME_POSIX_ACL_ACCESS; 499 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 500 } else { 501 name = XATTR_NAME_POSIX_ACL_DEFAULT; 502 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 503 } 504 505 if (!locked) 506 ni_lock(ni); 507 508 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 509 510 if (!locked) 511 ni_unlock(ni); 512 513 /* Translate extended attribute to acl. */ 514 if (err >= 0) { 515 acl = posix_acl_from_xattr(mnt_userns, buf, err); 516 } else if (err == -ENODATA) { 517 acl = NULL; 518 } else { 519 acl = ERR_PTR(err); 520 } 521 522 if (!IS_ERR(acl)) 523 set_cached_acl(inode, type, acl); 524 525 __putname(buf); 526 527 return acl; 528 } 529 530 /* 531 * ntfs_get_acl - inode_operations::get_acl 532 */ 533 struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu) 534 { 535 if (rcu) 536 return ERR_PTR(-ECHILD); 537 538 /* TODO: init_user_ns? */ 539 return ntfs_get_acl_ex(&init_user_ns, inode, type, 0); 540 } 541 542 static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns, 543 struct inode *inode, struct posix_acl *acl, 544 int type) 545 { 546 const char *name; 547 size_t size, name_len; 548 void *value = NULL; 549 int err = 0; 550 int flags; 551 552 if (S_ISLNK(inode->i_mode)) 553 return -EOPNOTSUPP; 554 555 switch (type) { 556 case ACL_TYPE_ACCESS: 557 if (acl) { 558 umode_t mode = inode->i_mode; 559 560 err = posix_acl_update_mode(mnt_userns, inode, &mode, 561 &acl); 562 if (err) 563 goto out; 564 565 if (inode->i_mode != mode) { 566 inode->i_mode = mode; 567 mark_inode_dirty(inode); 568 } 569 } 570 name = XATTR_NAME_POSIX_ACL_ACCESS; 571 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 572 break; 573 574 case ACL_TYPE_DEFAULT: 575 if (!S_ISDIR(inode->i_mode)) 576 return acl ? -EACCES : 0; 577 name = XATTR_NAME_POSIX_ACL_DEFAULT; 578 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 579 break; 580 581 default: 582 return -EINVAL; 583 } 584 585 if (!acl) { 586 /* Remove xattr if it can be presented via mode. */ 587 size = 0; 588 value = NULL; 589 flags = XATTR_REPLACE; 590 } else { 591 size = posix_acl_xattr_size(acl->a_count); 592 value = kmalloc(size, GFP_NOFS); 593 if (!value) 594 return -ENOMEM; 595 err = posix_acl_to_xattr(mnt_userns, acl, value, size); 596 if (err < 0) 597 goto out; 598 flags = 0; 599 } 600 601 err = ntfs_set_ea(inode, name, name_len, value, size, flags); 602 if (err == -ENODATA && !size) 603 err = 0; /* Removing non existed xattr. */ 604 if (!err) 605 set_cached_acl(inode, type, acl); 606 607 out: 608 kfree(value); 609 610 return err; 611 } 612 613 /* 614 * ntfs_set_acl - inode_operations::set_acl 615 */ 616 int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, 617 struct posix_acl *acl, int type) 618 { 619 return ntfs_set_acl_ex(mnt_userns, inode, acl, type); 620 } 621 622 /* 623 * ntfs_init_acl - Initialize the ACLs of a new inode. 624 * 625 * Called from ntfs_create_inode(). 626 */ 627 int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, 628 struct inode *dir) 629 { 630 struct posix_acl *default_acl, *acl; 631 int err; 632 633 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 634 if (err) 635 return err; 636 637 if (default_acl) { 638 err = ntfs_set_acl_ex(mnt_userns, inode, default_acl, 639 ACL_TYPE_DEFAULT); 640 posix_acl_release(default_acl); 641 } else { 642 inode->i_default_acl = NULL; 643 } 644 645 if (!acl) 646 inode->i_acl = NULL; 647 else { 648 if (!err) 649 err = ntfs_set_acl_ex(mnt_userns, inode, acl, 650 ACL_TYPE_ACCESS); 651 posix_acl_release(acl); 652 } 653 654 return err; 655 } 656 #endif 657 658 /* 659 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 660 */ 661 int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode) 662 { 663 struct super_block *sb = inode->i_sb; 664 665 if (!(sb->s_flags & SB_POSIXACL)) 666 return 0; 667 668 if (S_ISLNK(inode->i_mode)) 669 return -EOPNOTSUPP; 670 671 return posix_acl_chmod(mnt_userns, inode, inode->i_mode); 672 } 673 674 /* 675 * ntfs_permission - inode_operations::permission 676 */ 677 int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 678 int mask) 679 { 680 if (ntfs_sb(inode->i_sb)->options->noacsrules) { 681 /* "No access rules" mode - Allow all changes. */ 682 return 0; 683 } 684 685 return generic_permission(mnt_userns, inode, mask); 686 } 687 688 /* 689 * ntfs_listxattr - inode_operations::listxattr 690 */ 691 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 692 { 693 struct inode *inode = d_inode(dentry); 694 struct ntfs_inode *ni = ntfs_i(inode); 695 ssize_t ret; 696 697 if (!(ni->ni_flags & NI_FLAG_EA)) { 698 /* no xattr in file */ 699 return 0; 700 } 701 702 ni_lock(ni); 703 704 ret = ntfs_list_ea(ni, buffer, size); 705 706 ni_unlock(ni); 707 708 return ret; 709 } 710 711 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 712 struct inode *inode, const char *name, void *buffer, 713 size_t size) 714 { 715 int err; 716 struct ntfs_inode *ni = ntfs_i(inode); 717 size_t name_len = strlen(name); 718 719 /* Dispatch request. */ 720 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 721 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 722 /* system.dos_attrib */ 723 if (!buffer) { 724 err = sizeof(u8); 725 } else if (size < sizeof(u8)) { 726 err = -ENODATA; 727 } else { 728 err = sizeof(u8); 729 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 730 } 731 goto out; 732 } 733 734 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 735 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 736 /* system.ntfs_attrib */ 737 if (!buffer) { 738 err = sizeof(u32); 739 } else if (size < sizeof(u32)) { 740 err = -ENODATA; 741 } else { 742 err = sizeof(u32); 743 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 744 } 745 goto out; 746 } 747 748 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 749 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 750 /* system.ntfs_security*/ 751 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 752 size_t sd_size = 0; 753 754 if (!is_ntfs3(ni->mi.sbi)) { 755 /* We should get nt4 security. */ 756 err = -EINVAL; 757 goto out; 758 } else if (le32_to_cpu(ni->std_security_id) < 759 SECURITY_ID_FIRST) { 760 err = -ENOENT; 761 goto out; 762 } 763 764 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 765 &sd, &sd_size); 766 if (err) 767 goto out; 768 769 if (!is_sd_valid(sd, sd_size)) { 770 ntfs_inode_warn( 771 inode, 772 "looks like you get incorrect security descriptor id=%u", 773 ni->std_security_id); 774 } 775 776 if (!buffer) { 777 err = sd_size; 778 } else if (size < sd_size) { 779 err = -ENODATA; 780 } else { 781 err = sd_size; 782 memcpy(buffer, sd, sd_size); 783 } 784 kfree(sd); 785 goto out; 786 } 787 788 /* Deal with NTFS extended attribute. */ 789 err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL); 790 791 out: 792 return err; 793 } 794 795 /* 796 * ntfs_setxattr - inode_operations::setxattr 797 */ 798 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 799 struct user_namespace *mnt_userns, 800 struct dentry *de, struct inode *inode, 801 const char *name, const void *value, 802 size_t size, int flags) 803 { 804 int err = -EINVAL; 805 struct ntfs_inode *ni = ntfs_i(inode); 806 size_t name_len = strlen(name); 807 enum FILE_ATTRIBUTE new_fa; 808 809 /* Dispatch request. */ 810 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 811 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 812 if (sizeof(u8) != size) 813 goto out; 814 new_fa = cpu_to_le32(*(u8 *)value); 815 goto set_new_fa; 816 } 817 818 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 819 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 820 if (size != sizeof(u32)) 821 goto out; 822 new_fa = cpu_to_le32(*(u32 *)value); 823 824 if (S_ISREG(inode->i_mode)) { 825 /* Process compressed/sparsed in special way. */ 826 ni_lock(ni); 827 err = ni_new_attr_flags(ni, new_fa); 828 ni_unlock(ni); 829 if (err) 830 goto out; 831 } 832 set_new_fa: 833 /* 834 * Thanks Mark Harmstone: 835 * Keep directory bit consistency. 836 */ 837 if (S_ISDIR(inode->i_mode)) 838 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 839 else 840 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 841 842 if (ni->std_fa != new_fa) { 843 ni->std_fa = new_fa; 844 if (new_fa & FILE_ATTRIBUTE_READONLY) 845 inode->i_mode &= ~0222; 846 else 847 inode->i_mode |= 0222; 848 /* Std attribute always in primary record. */ 849 ni->mi.dirty = true; 850 mark_inode_dirty(inode); 851 } 852 err = 0; 853 854 goto out; 855 } 856 857 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 858 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 859 /* system.ntfs_security*/ 860 __le32 security_id; 861 bool inserted; 862 struct ATTR_STD_INFO5 *std; 863 864 if (!is_ntfs3(ni->mi.sbi)) { 865 /* 866 * We should replace ATTR_SECURE. 867 * Skip this way cause it is nt4 feature. 868 */ 869 err = -EINVAL; 870 goto out; 871 } 872 873 if (!is_sd_valid(value, size)) { 874 err = -EINVAL; 875 ntfs_inode_warn( 876 inode, 877 "you try to set invalid security descriptor"); 878 goto out; 879 } 880 881 err = ntfs_insert_security(ni->mi.sbi, value, size, 882 &security_id, &inserted); 883 if (err) 884 goto out; 885 886 ni_lock(ni); 887 std = ni_std5(ni); 888 if (!std) { 889 err = -EINVAL; 890 } else if (std->security_id != security_id) { 891 std->security_id = ni->std_security_id = security_id; 892 /* Std attribute always in primary record. */ 893 ni->mi.dirty = true; 894 mark_inode_dirty(&ni->vfs_inode); 895 } 896 ni_unlock(ni); 897 goto out; 898 } 899 900 /* Deal with NTFS extended attribute. */ 901 err = ntfs_set_ea(inode, name, name_len, value, size, flags); 902 903 out: 904 return err; 905 } 906 907 /* 908 * ntfs_save_wsl_perm 909 * 910 * save uid/gid/mode in xattr 911 */ 912 int ntfs_save_wsl_perm(struct inode *inode) 913 { 914 int err; 915 __le32 value; 916 917 /* TODO: refactor this, so we don't lock 4 times in ntfs_set_ea */ 918 value = cpu_to_le32(i_uid_read(inode)); 919 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 920 sizeof(value), 0); 921 if (err) 922 goto out; 923 924 value = cpu_to_le32(i_gid_read(inode)); 925 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 926 sizeof(value), 0); 927 if (err) 928 goto out; 929 930 value = cpu_to_le32(inode->i_mode); 931 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 932 sizeof(value), 0); 933 if (err) 934 goto out; 935 936 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 937 value = cpu_to_le32(inode->i_rdev); 938 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 939 sizeof(value), 0); 940 if (err) 941 goto out; 942 } 943 944 out: 945 /* In case of error should we delete all WSL xattr? */ 946 return err; 947 } 948 949 /* 950 * ntfs_get_wsl_perm 951 * 952 * get uid/gid/mode from xattr 953 * it is called from ntfs_iget5->ntfs_read_mft 954 */ 955 void ntfs_get_wsl_perm(struct inode *inode) 956 { 957 size_t sz; 958 __le32 value[3]; 959 960 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 961 sizeof(value[0]), &sz) == sizeof(value[0]) && 962 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 963 sizeof(value[1]), &sz) == sizeof(value[1]) && 964 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 965 sizeof(value[2]), &sz) == sizeof(value[2])) { 966 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 967 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 968 inode->i_mode = le32_to_cpu(value[2]); 969 970 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 971 &value[0], sizeof(value), 972 &sz) == sizeof(value[0])) { 973 inode->i_rdev = le32_to_cpu(value[0]); 974 } 975 } 976 } 977 978 static bool ntfs_xattr_user_list(struct dentry *dentry) 979 { 980 return true; 981 } 982 983 // clang-format off 984 static const struct xattr_handler ntfs_xattr_handler = { 985 .prefix = "", 986 .get = ntfs_getxattr, 987 .set = ntfs_setxattr, 988 .list = ntfs_xattr_user_list, 989 }; 990 991 const struct xattr_handler *ntfs_xattr_handlers[] = { 992 &ntfs_xattr_handler, 993 NULL, 994 }; 995 // clang-format on 996