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 /* Check all attributes for consistency. */ 145 for (off = 0; off < size; off += ea_size) { 146 const struct EA_FULL *ef = Add2Ptr(ea_p, off); 147 u32 bytes = size - off; 148 149 /* Check if we can use field ea->size. */ 150 if (bytes < sizeof(ef->size)) 151 goto out1; 152 153 if (ef->size) { 154 ea_size = le32_to_cpu(ef->size); 155 if (ea_size > bytes) 156 goto out1; 157 continue; 158 } 159 160 /* Check if we can use fields ef->name_len and ef->elength. */ 161 if (bytes < offsetof(struct EA_FULL, name)) 162 goto out1; 163 164 ea_size = ALIGN(struct_size(ef, name, 165 1 + ef->name_len + 166 le16_to_cpu(ef->elength)), 167 4); 168 if (ea_size > bytes) 169 goto out1; 170 } 171 172 *ea = ea_p; 173 return 0; 174 175 out1: 176 kfree(ea_p); 177 out: 178 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 179 return err; 180 } 181 182 /* 183 * ntfs_list_ea 184 * 185 * Copy a list of xattrs names into the buffer 186 * provided, or compute the buffer size required. 187 * 188 * Return: 189 * * Number of bytes used / required on 190 * * -ERRNO - on failure 191 */ 192 static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer, 193 size_t bytes_per_buffer) 194 { 195 const struct EA_INFO *info; 196 struct EA_FULL *ea_all = NULL; 197 const struct EA_FULL *ea; 198 u32 off, size; 199 int err; 200 int ea_size; 201 size_t ret; 202 203 err = ntfs_read_ea(ni, &ea_all, 0, &info); 204 if (err) 205 return err; 206 207 if (!info || !ea_all) 208 return 0; 209 210 size = le32_to_cpu(info->size); 211 212 /* Enumerate all xattrs. */ 213 for (ret = 0, off = 0; off < size; off += ea_size) { 214 ea = Add2Ptr(ea_all, off); 215 ea_size = unpacked_ea_size(ea); 216 217 if (buffer) { 218 if (ret + ea->name_len + 1 > bytes_per_buffer) { 219 err = -ERANGE; 220 goto out; 221 } 222 223 memcpy(buffer + ret, ea->name, ea->name_len); 224 buffer[ret + ea->name_len] = 0; 225 } 226 227 ret += ea->name_len + 1; 228 } 229 230 out: 231 kfree(ea_all); 232 return err ? err : ret; 233 } 234 235 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len, 236 void *buffer, size_t size, size_t *required) 237 { 238 struct ntfs_inode *ni = ntfs_i(inode); 239 const struct EA_INFO *info; 240 struct EA_FULL *ea_all = NULL; 241 const struct EA_FULL *ea; 242 u32 off, len; 243 int err; 244 245 if (!(ni->ni_flags & NI_FLAG_EA)) 246 return -ENODATA; 247 248 if (!required) 249 ni_lock(ni); 250 251 len = 0; 252 253 if (name_len > 255) { 254 err = -ENAMETOOLONG; 255 goto out; 256 } 257 258 err = ntfs_read_ea(ni, &ea_all, 0, &info); 259 if (err) 260 goto out; 261 262 if (!info) 263 goto out; 264 265 /* Enumerate all xattrs. */ 266 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off, 267 NULL)) { 268 err = -ENODATA; 269 goto out; 270 } 271 ea = Add2Ptr(ea_all, off); 272 273 len = le16_to_cpu(ea->elength); 274 if (!buffer) { 275 err = 0; 276 goto out; 277 } 278 279 if (len > size) { 280 err = -ERANGE; 281 if (required) 282 *required = len; 283 goto out; 284 } 285 286 memcpy(buffer, ea->name + ea->name_len + 1, len); 287 err = 0; 288 289 out: 290 kfree(ea_all); 291 if (!required) 292 ni_unlock(ni); 293 294 return err ? err : len; 295 } 296 297 static noinline int ntfs_set_ea(struct inode *inode, const char *name, 298 size_t name_len, const void *value, 299 size_t val_size, int flags, bool locked) 300 { 301 struct ntfs_inode *ni = ntfs_i(inode); 302 struct ntfs_sb_info *sbi = ni->mi.sbi; 303 int err; 304 struct EA_INFO ea_info; 305 const struct EA_INFO *info; 306 struct EA_FULL *new_ea; 307 struct EA_FULL *ea_all = NULL; 308 size_t add, new_pack; 309 u32 off, size, ea_sz; 310 __le16 size_pack; 311 struct ATTRIB *attr; 312 struct ATTR_LIST_ENTRY *le; 313 struct mft_inode *mi; 314 struct runs_tree ea_run; 315 u64 new_sz; 316 void *p; 317 318 if (!locked) 319 ni_lock(ni); 320 321 run_init(&ea_run); 322 323 if (name_len > 255) { 324 err = -ENAMETOOLONG; 325 goto out; 326 } 327 328 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 329 330 err = ntfs_read_ea(ni, &ea_all, add, &info); 331 if (err) 332 goto out; 333 334 if (!info) { 335 memset(&ea_info, 0, sizeof(ea_info)); 336 size = 0; 337 size_pack = 0; 338 } else { 339 memcpy(&ea_info, info, sizeof(ea_info)); 340 size = le32_to_cpu(ea_info.size); 341 size_pack = ea_info.size_pack; 342 } 343 344 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) { 345 struct EA_FULL *ea; 346 347 if (flags & XATTR_CREATE) { 348 err = -EEXIST; 349 goto out; 350 } 351 352 ea = Add2Ptr(ea_all, off); 353 354 /* 355 * Check simple case when we try to insert xattr with the same value 356 * e.g. ntfs_save_wsl_perm 357 */ 358 if (val_size && le16_to_cpu(ea->elength) == val_size && 359 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 360 /* xattr already contains the required value. */ 361 goto out; 362 } 363 364 /* Remove current xattr. */ 365 if (ea->flags & FILE_NEED_EA) 366 le16_add_cpu(&ea_info.count, -1); 367 368 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 369 370 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 371 372 size -= ea_sz; 373 memset(Add2Ptr(ea_all, size), 0, ea_sz); 374 375 ea_info.size = cpu_to_le32(size); 376 377 if ((flags & XATTR_REPLACE) && !val_size) { 378 /* Remove xattr. */ 379 goto update_ea; 380 } 381 } else { 382 if (flags & XATTR_REPLACE) { 383 err = -ENODATA; 384 goto out; 385 } 386 387 if (!ea_all) { 388 ea_all = kzalloc(add, GFP_NOFS); 389 if (!ea_all) { 390 err = -ENOMEM; 391 goto out; 392 } 393 } 394 } 395 396 /* Append new xattr. */ 397 new_ea = Add2Ptr(ea_all, size); 398 new_ea->size = cpu_to_le32(add); 399 new_ea->flags = 0; 400 new_ea->name_len = name_len; 401 new_ea->elength = cpu_to_le16(val_size); 402 memcpy(new_ea->name, name, name_len); 403 new_ea->name[name_len] = 0; 404 memcpy(new_ea->name + name_len + 1, value, val_size); 405 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 406 ea_info.size_pack = cpu_to_le16(new_pack); 407 /* New size of ATTR_EA. */ 408 size += add; 409 ea_info.size = cpu_to_le32(size); 410 411 /* 412 * 1. Check ea_info.size_pack for overflow. 413 * 2. New attibute size must fit value from $AttrDef 414 */ 415 if (new_pack > 0xffff || size > sbi->ea_max_size) { 416 ntfs_inode_warn( 417 inode, 418 "The size of extended attributes must not exceed 64KiB"); 419 err = -EFBIG; // -EINVAL? 420 goto out; 421 } 422 423 update_ea: 424 425 if (!info) { 426 /* Create xattr. */ 427 if (!size) { 428 err = 0; 429 goto out; 430 } 431 432 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 433 ATTR_EA_INFO, NULL, 0, NULL, NULL, 434 NULL); 435 if (err) 436 goto out; 437 438 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 439 NULL); 440 if (err) 441 goto out; 442 } 443 444 new_sz = size; 445 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 446 false, NULL); 447 if (err) 448 goto out; 449 450 le = NULL; 451 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 452 if (!attr) { 453 err = -EINVAL; 454 goto out; 455 } 456 457 if (!size) { 458 /* Delete xattr, ATTR_EA_INFO */ 459 ni_remove_attr_le(ni, attr, mi, le); 460 } else { 461 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 462 if (!p) { 463 err = -EINVAL; 464 goto out; 465 } 466 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 467 mi->dirty = true; 468 } 469 470 le = NULL; 471 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 472 if (!attr) { 473 err = -EINVAL; 474 goto out; 475 } 476 477 if (!size) { 478 /* Delete xattr, ATTR_EA */ 479 ni_remove_attr_le(ni, attr, mi, le); 480 } else if (attr->non_res) { 481 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0, 482 size); 483 if (err) 484 goto out; 485 486 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 487 if (err) 488 goto out; 489 } else { 490 p = resident_data_ex(attr, size); 491 if (!p) { 492 err = -EINVAL; 493 goto out; 494 } 495 memcpy(p, ea_all, size); 496 mi->dirty = true; 497 } 498 499 /* Check if we delete the last xattr. */ 500 if (size) 501 ni->ni_flags |= NI_FLAG_EA; 502 else 503 ni->ni_flags &= ~NI_FLAG_EA; 504 505 if (ea_info.size_pack != size_pack) 506 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 507 mark_inode_dirty(&ni->vfs_inode); 508 509 out: 510 if (!locked) 511 ni_unlock(ni); 512 513 run_close(&ea_run); 514 kfree(ea_all); 515 516 return err; 517 } 518 519 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 520 static struct posix_acl *ntfs_get_acl_ex(struct inode *inode, int type, 521 int locked) 522 { 523 struct ntfs_inode *ni = ntfs_i(inode); 524 const char *name; 525 size_t name_len; 526 struct posix_acl *acl; 527 size_t req; 528 int err; 529 void *buf; 530 531 /* Allocate PATH_MAX bytes. */ 532 buf = __getname(); 533 if (!buf) 534 return ERR_PTR(-ENOMEM); 535 536 /* Possible values of 'type' was already checked above. */ 537 if (type == ACL_TYPE_ACCESS) { 538 name = XATTR_NAME_POSIX_ACL_ACCESS; 539 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 540 } else { 541 name = XATTR_NAME_POSIX_ACL_DEFAULT; 542 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 543 } 544 545 if (!locked) 546 ni_lock(ni); 547 548 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 549 550 if (!locked) 551 ni_unlock(ni); 552 553 /* Translate extended attribute to acl. */ 554 if (err >= 0) { 555 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 556 } else if (err == -ENODATA) { 557 acl = NULL; 558 } else { 559 acl = ERR_PTR(err); 560 } 561 562 if (!IS_ERR(acl)) 563 set_cached_acl(inode, type, acl); 564 565 __putname(buf); 566 567 return acl; 568 } 569 570 /* 571 * ntfs_get_acl - inode_operations::get_acl 572 */ 573 struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu) 574 { 575 if (rcu) 576 return ERR_PTR(-ECHILD); 577 578 return ntfs_get_acl_ex(inode, type, 0); 579 } 580 581 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, 582 struct inode *inode, struct posix_acl *acl, 583 int type, bool init_acl) 584 { 585 const char *name; 586 size_t size, name_len; 587 void *value; 588 int err; 589 int flags; 590 umode_t mode; 591 592 if (S_ISLNK(inode->i_mode)) 593 return -EOPNOTSUPP; 594 595 mode = inode->i_mode; 596 switch (type) { 597 case ACL_TYPE_ACCESS: 598 /* Do not change i_mode if we are in init_acl */ 599 if (acl && !init_acl) { 600 err = posix_acl_update_mode(idmap, inode, &mode, 601 &acl); 602 if (err) 603 return err; 604 } 605 name = XATTR_NAME_POSIX_ACL_ACCESS; 606 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 607 break; 608 609 case ACL_TYPE_DEFAULT: 610 if (!S_ISDIR(inode->i_mode)) 611 return acl ? -EACCES : 0; 612 name = XATTR_NAME_POSIX_ACL_DEFAULT; 613 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 614 break; 615 616 default: 617 return -EINVAL; 618 } 619 620 if (!acl) { 621 /* Remove xattr if it can be presented via mode. */ 622 size = 0; 623 value = NULL; 624 flags = XATTR_REPLACE; 625 } else { 626 size = posix_acl_xattr_size(acl->a_count); 627 value = kmalloc(size, GFP_NOFS); 628 if (!value) 629 return -ENOMEM; 630 err = posix_acl_to_xattr(&init_user_ns, acl, value, size); 631 if (err < 0) 632 goto out; 633 flags = 0; 634 } 635 636 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0); 637 if (err == -ENODATA && !size) 638 err = 0; /* Removing non existed xattr. */ 639 if (!err) { 640 set_cached_acl(inode, type, acl); 641 inode->i_mode = mode; 642 inode->i_ctime = current_time(inode); 643 mark_inode_dirty(inode); 644 } 645 646 out: 647 kfree(value); 648 649 return err; 650 } 651 652 /* 653 * ntfs_set_acl - inode_operations::set_acl 654 */ 655 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 656 struct posix_acl *acl, int type) 657 { 658 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); 659 } 660 661 /* 662 * ntfs_init_acl - Initialize the ACLs of a new inode. 663 * 664 * Called from ntfs_create_inode(). 665 */ 666 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, 667 struct inode *dir) 668 { 669 struct posix_acl *default_acl, *acl; 670 int err; 671 672 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 673 if (err) 674 return err; 675 676 if (default_acl) { 677 err = ntfs_set_acl_ex(idmap, inode, default_acl, 678 ACL_TYPE_DEFAULT, true); 679 posix_acl_release(default_acl); 680 } else { 681 inode->i_default_acl = NULL; 682 } 683 684 if (acl) { 685 if (!err) 686 err = ntfs_set_acl_ex(idmap, inode, acl, 687 ACL_TYPE_ACCESS, true); 688 posix_acl_release(acl); 689 } else { 690 inode->i_acl = NULL; 691 } 692 693 return err; 694 } 695 #endif 696 697 /* 698 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 699 */ 700 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry) 701 { 702 struct inode *inode = d_inode(dentry); 703 struct super_block *sb = inode->i_sb; 704 705 if (!(sb->s_flags & SB_POSIXACL)) 706 return 0; 707 708 if (S_ISLNK(inode->i_mode)) 709 return -EOPNOTSUPP; 710 711 return posix_acl_chmod(idmap, dentry, inode->i_mode); 712 } 713 714 /* 715 * ntfs_permission - inode_operations::permission 716 */ 717 int ntfs_permission(struct mnt_idmap *idmap, struct inode *inode, 718 int mask) 719 { 720 if (ntfs_sb(inode->i_sb)->options->noacsrules) { 721 /* "No access rules" mode - Allow all changes. */ 722 return 0; 723 } 724 725 return generic_permission(idmap, inode, mask); 726 } 727 728 /* 729 * ntfs_listxattr - inode_operations::listxattr 730 */ 731 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 732 { 733 struct inode *inode = d_inode(dentry); 734 struct ntfs_inode *ni = ntfs_i(inode); 735 ssize_t ret; 736 737 if (!(ni->ni_flags & NI_FLAG_EA)) { 738 /* no xattr in file */ 739 return 0; 740 } 741 742 ni_lock(ni); 743 744 ret = ntfs_list_ea(ni, buffer, size); 745 746 ni_unlock(ni); 747 748 return ret; 749 } 750 751 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 752 struct inode *inode, const char *name, void *buffer, 753 size_t size) 754 { 755 int err; 756 struct ntfs_inode *ni = ntfs_i(inode); 757 758 /* Dispatch request. */ 759 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 760 /* system.dos_attrib */ 761 if (!buffer) { 762 err = sizeof(u8); 763 } else if (size < sizeof(u8)) { 764 err = -ENODATA; 765 } else { 766 err = sizeof(u8); 767 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 768 } 769 goto out; 770 } 771 772 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 773 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 774 /* system.ntfs_attrib */ 775 if (!buffer) { 776 err = sizeof(u32); 777 } else if (size < sizeof(u32)) { 778 err = -ENODATA; 779 } else { 780 err = sizeof(u32); 781 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 782 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 783 *(u32 *)buffer = cpu_to_be32(*(u32 *)buffer); 784 } 785 goto out; 786 } 787 788 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 789 /* system.ntfs_security*/ 790 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 791 size_t sd_size = 0; 792 793 if (!is_ntfs3(ni->mi.sbi)) { 794 /* We should get nt4 security. */ 795 err = -EINVAL; 796 goto out; 797 } else if (le32_to_cpu(ni->std_security_id) < 798 SECURITY_ID_FIRST) { 799 err = -ENOENT; 800 goto out; 801 } 802 803 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 804 &sd, &sd_size); 805 if (err) 806 goto out; 807 808 if (!is_sd_valid(sd, sd_size)) { 809 ntfs_inode_warn( 810 inode, 811 "looks like you get incorrect security descriptor id=%u", 812 ni->std_security_id); 813 } 814 815 if (!buffer) { 816 err = sd_size; 817 } else if (size < sd_size) { 818 err = -ENODATA; 819 } else { 820 err = sd_size; 821 memcpy(buffer, sd, sd_size); 822 } 823 kfree(sd); 824 goto out; 825 } 826 827 /* Deal with NTFS extended attribute. */ 828 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL); 829 830 out: 831 return err; 832 } 833 834 /* 835 * ntfs_setxattr - inode_operations::setxattr 836 */ 837 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 838 struct mnt_idmap *idmap, 839 struct dentry *de, struct inode *inode, 840 const char *name, const void *value, 841 size_t size, int flags) 842 { 843 int err = -EINVAL; 844 struct ntfs_inode *ni = ntfs_i(inode); 845 enum FILE_ATTRIBUTE new_fa; 846 847 /* Dispatch request. */ 848 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 849 if (sizeof(u8) != size) 850 goto out; 851 new_fa = cpu_to_le32(*(u8 *)value); 852 goto set_new_fa; 853 } 854 855 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 856 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 857 if (size != sizeof(u32)) 858 goto out; 859 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 860 new_fa = cpu_to_le32(be32_to_cpu(*(u32 *)value)); 861 else 862 new_fa = cpu_to_le32(*(u32 *)value); 863 864 if (S_ISREG(inode->i_mode)) { 865 /* Process compressed/sparsed in special way. */ 866 ni_lock(ni); 867 err = ni_new_attr_flags(ni, new_fa); 868 ni_unlock(ni); 869 if (err) 870 goto out; 871 } 872 set_new_fa: 873 /* 874 * Thanks Mark Harmstone: 875 * Keep directory bit consistency. 876 */ 877 if (S_ISDIR(inode->i_mode)) 878 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 879 else 880 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 881 882 if (ni->std_fa != new_fa) { 883 ni->std_fa = new_fa; 884 if (new_fa & FILE_ATTRIBUTE_READONLY) 885 inode->i_mode &= ~0222; 886 else 887 inode->i_mode |= 0222; 888 /* Std attribute always in primary record. */ 889 ni->mi.dirty = true; 890 mark_inode_dirty(inode); 891 } 892 err = 0; 893 894 goto out; 895 } 896 897 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 898 /* system.ntfs_security*/ 899 __le32 security_id; 900 bool inserted; 901 struct ATTR_STD_INFO5 *std; 902 903 if (!is_ntfs3(ni->mi.sbi)) { 904 /* 905 * We should replace ATTR_SECURE. 906 * Skip this way cause it is nt4 feature. 907 */ 908 err = -EINVAL; 909 goto out; 910 } 911 912 if (!is_sd_valid(value, size)) { 913 err = -EINVAL; 914 ntfs_inode_warn( 915 inode, 916 "you try to set invalid security descriptor"); 917 goto out; 918 } 919 920 err = ntfs_insert_security(ni->mi.sbi, value, size, 921 &security_id, &inserted); 922 if (err) 923 goto out; 924 925 ni_lock(ni); 926 std = ni_std5(ni); 927 if (!std) { 928 err = -EINVAL; 929 } else if (std->security_id != security_id) { 930 std->security_id = ni->std_security_id = security_id; 931 /* Std attribute always in primary record. */ 932 ni->mi.dirty = true; 933 mark_inode_dirty(&ni->vfs_inode); 934 } 935 ni_unlock(ni); 936 goto out; 937 } 938 939 /* Deal with NTFS extended attribute. */ 940 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0); 941 942 out: 943 inode->i_ctime = current_time(inode); 944 mark_inode_dirty(inode); 945 946 return err; 947 } 948 949 /* 950 * ntfs_save_wsl_perm 951 * 952 * save uid/gid/mode in xattr 953 */ 954 int ntfs_save_wsl_perm(struct inode *inode) 955 { 956 int err; 957 __le32 value; 958 struct ntfs_inode *ni = ntfs_i(inode); 959 960 ni_lock(ni); 961 value = cpu_to_le32(i_uid_read(inode)); 962 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 963 sizeof(value), 0, true); /* true == already locked. */ 964 if (err) 965 goto out; 966 967 value = cpu_to_le32(i_gid_read(inode)); 968 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 969 sizeof(value), 0, true); 970 if (err) 971 goto out; 972 973 value = cpu_to_le32(inode->i_mode); 974 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 975 sizeof(value), 0, true); 976 if (err) 977 goto out; 978 979 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 980 value = cpu_to_le32(inode->i_rdev); 981 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 982 sizeof(value), 0, true); 983 if (err) 984 goto out; 985 } 986 987 out: 988 ni_unlock(ni); 989 /* In case of error should we delete all WSL xattr? */ 990 return err; 991 } 992 993 /* 994 * ntfs_get_wsl_perm 995 * 996 * get uid/gid/mode from xattr 997 * it is called from ntfs_iget5->ntfs_read_mft 998 */ 999 void ntfs_get_wsl_perm(struct inode *inode) 1000 { 1001 size_t sz; 1002 __le32 value[3]; 1003 1004 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 1005 sizeof(value[0]), &sz) == sizeof(value[0]) && 1006 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 1007 sizeof(value[1]), &sz) == sizeof(value[1]) && 1008 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 1009 sizeof(value[2]), &sz) == sizeof(value[2])) { 1010 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1011 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1012 inode->i_mode = le32_to_cpu(value[2]); 1013 1014 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1015 &value[0], sizeof(value), 1016 &sz) == sizeof(value[0])) { 1017 inode->i_rdev = le32_to_cpu(value[0]); 1018 } 1019 } 1020 } 1021 1022 static bool ntfs_xattr_user_list(struct dentry *dentry) 1023 { 1024 return true; 1025 } 1026 1027 // clang-format off 1028 static const struct xattr_handler ntfs_other_xattr_handler = { 1029 .prefix = "", 1030 .get = ntfs_getxattr, 1031 .set = ntfs_setxattr, 1032 .list = ntfs_xattr_user_list, 1033 }; 1034 1035 const struct xattr_handler *ntfs_xattr_handlers[] = { 1036 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1037 &posix_acl_access_xattr_handler, 1038 &posix_acl_default_xattr_handler, 1039 #endif 1040 &ntfs_other_xattr_handler, 1041 NULL, 1042 }; 1043 // clang-format on 1044