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 /* EA info persists, but xattr is empty. Looks like EA problem. */ 116 } else if (attr_ea->non_res) { 117 struct runs_tree run; 118 119 run_init(&run); 120 121 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &run, 0, size); 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, bool locked) 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 if (!locked) 282 ni_lock(ni); 283 284 run_init(&ea_run); 285 286 if (name_len > 255) { 287 err = -ENAMETOOLONG; 288 goto out; 289 } 290 291 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 292 293 err = ntfs_read_ea(ni, &ea_all, add, &info); 294 if (err) 295 goto out; 296 297 if (!info) { 298 memset(&ea_info, 0, sizeof(ea_info)); 299 size = 0; 300 size_pack = 0; 301 } else { 302 memcpy(&ea_info, info, sizeof(ea_info)); 303 size = le32_to_cpu(ea_info.size); 304 size_pack = ea_info.size_pack; 305 } 306 307 if (info && find_ea(ea_all, size, name, name_len, &off)) { 308 struct EA_FULL *ea; 309 size_t ea_sz; 310 311 if (flags & XATTR_CREATE) { 312 err = -EEXIST; 313 goto out; 314 } 315 316 ea = Add2Ptr(ea_all, off); 317 318 /* 319 * Check simple case when we try to insert xattr with the same value 320 * e.g. ntfs_save_wsl_perm 321 */ 322 if (val_size && le16_to_cpu(ea->elength) == val_size && 323 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 324 /* xattr already contains the required value. */ 325 goto out; 326 } 327 328 /* Remove current xattr. */ 329 if (ea->flags & FILE_NEED_EA) 330 le16_add_cpu(&ea_info.count, -1); 331 332 ea_sz = unpacked_ea_size(ea); 333 334 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 335 336 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 337 338 size -= ea_sz; 339 memset(Add2Ptr(ea_all, size), 0, ea_sz); 340 341 ea_info.size = cpu_to_le32(size); 342 343 if ((flags & XATTR_REPLACE) && !val_size) { 344 /* Remove xattr. */ 345 goto update_ea; 346 } 347 } else { 348 if (flags & XATTR_REPLACE) { 349 err = -ENODATA; 350 goto out; 351 } 352 353 if (!ea_all) { 354 ea_all = kzalloc(add, GFP_NOFS); 355 if (!ea_all) { 356 err = -ENOMEM; 357 goto out; 358 } 359 } 360 } 361 362 /* Append new xattr. */ 363 new_ea = Add2Ptr(ea_all, size); 364 new_ea->size = cpu_to_le32(add); 365 new_ea->flags = 0; 366 new_ea->name_len = name_len; 367 new_ea->elength = cpu_to_le16(val_size); 368 memcpy(new_ea->name, name, name_len); 369 new_ea->name[name_len] = 0; 370 memcpy(new_ea->name + name_len + 1, value, val_size); 371 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 372 ea_info.size_pack = cpu_to_le16(new_pack); 373 /* New size of ATTR_EA. */ 374 size += add; 375 ea_info.size = cpu_to_le32(size); 376 377 /* 378 * 1. Check ea_info.size_pack for overflow. 379 * 2. New attibute size must fit value from $AttrDef 380 */ 381 if (new_pack > 0xffff || size > sbi->ea_max_size) { 382 ntfs_inode_warn( 383 inode, 384 "The size of extended attributes must not exceed 64KiB"); 385 err = -EFBIG; // -EINVAL? 386 goto out; 387 } 388 389 update_ea: 390 391 if (!info) { 392 /* Create xattr. */ 393 if (!size) { 394 err = 0; 395 goto out; 396 } 397 398 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 399 ATTR_EA_INFO, NULL, 0, NULL, NULL, 400 NULL); 401 if (err) 402 goto out; 403 404 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 405 NULL); 406 if (err) 407 goto out; 408 } 409 410 new_sz = size; 411 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 412 false, NULL); 413 if (err) 414 goto out; 415 416 le = NULL; 417 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 418 if (!attr) { 419 err = -EINVAL; 420 goto out; 421 } 422 423 if (!size) { 424 /* Delete xattr, ATTR_EA_INFO */ 425 ni_remove_attr_le(ni, attr, mi, le); 426 } else { 427 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 428 if (!p) { 429 err = -EINVAL; 430 goto out; 431 } 432 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 433 mi->dirty = true; 434 } 435 436 le = NULL; 437 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 438 if (!attr) { 439 err = -EINVAL; 440 goto out; 441 } 442 443 if (!size) { 444 /* Delete xattr, ATTR_EA */ 445 ni_remove_attr_le(ni, attr, mi, le); 446 } else if (attr->non_res) { 447 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0, 448 size); 449 if (err) 450 goto out; 451 452 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 453 if (err) 454 goto out; 455 } else { 456 p = resident_data_ex(attr, size); 457 if (!p) { 458 err = -EINVAL; 459 goto out; 460 } 461 memcpy(p, ea_all, size); 462 mi->dirty = true; 463 } 464 465 /* Check if we delete the last xattr. */ 466 if (size) 467 ni->ni_flags |= NI_FLAG_EA; 468 else 469 ni->ni_flags &= ~NI_FLAG_EA; 470 471 if (ea_info.size_pack != size_pack) 472 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 473 mark_inode_dirty(&ni->vfs_inode); 474 475 out: 476 if (!locked) 477 ni_unlock(ni); 478 479 run_close(&ea_run); 480 kfree(ea_all); 481 482 return err; 483 } 484 485 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 486 static struct posix_acl *ntfs_get_acl_ex(struct inode *inode, int type, 487 int locked) 488 { 489 struct ntfs_inode *ni = ntfs_i(inode); 490 const char *name; 491 size_t name_len; 492 struct posix_acl *acl; 493 size_t req; 494 int err; 495 void *buf; 496 497 /* Allocate PATH_MAX bytes. */ 498 buf = __getname(); 499 if (!buf) 500 return ERR_PTR(-ENOMEM); 501 502 /* Possible values of 'type' was already checked above. */ 503 if (type == ACL_TYPE_ACCESS) { 504 name = XATTR_NAME_POSIX_ACL_ACCESS; 505 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 506 } else { 507 name = XATTR_NAME_POSIX_ACL_DEFAULT; 508 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 509 } 510 511 if (!locked) 512 ni_lock(ni); 513 514 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 515 516 if (!locked) 517 ni_unlock(ni); 518 519 /* Translate extended attribute to acl. */ 520 if (err >= 0) { 521 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 522 } else if (err == -ENODATA) { 523 acl = NULL; 524 } else { 525 acl = ERR_PTR(err); 526 } 527 528 if (!IS_ERR(acl)) 529 set_cached_acl(inode, type, acl); 530 531 __putname(buf); 532 533 return acl; 534 } 535 536 /* 537 * ntfs_get_acl - inode_operations::get_acl 538 */ 539 struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu) 540 { 541 if (rcu) 542 return ERR_PTR(-ECHILD); 543 544 return ntfs_get_acl_ex(inode, type, 0); 545 } 546 547 static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns, 548 struct inode *inode, struct posix_acl *acl, 549 int type, bool init_acl) 550 { 551 const char *name; 552 size_t size, name_len; 553 void *value; 554 int err; 555 int flags; 556 umode_t mode; 557 558 if (S_ISLNK(inode->i_mode)) 559 return -EOPNOTSUPP; 560 561 mode = inode->i_mode; 562 switch (type) { 563 case ACL_TYPE_ACCESS: 564 /* Do not change i_mode if we are in init_acl */ 565 if (acl && !init_acl) { 566 err = posix_acl_update_mode(mnt_userns, inode, &mode, 567 &acl); 568 if (err) 569 return err; 570 } 571 name = XATTR_NAME_POSIX_ACL_ACCESS; 572 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 573 break; 574 575 case ACL_TYPE_DEFAULT: 576 if (!S_ISDIR(inode->i_mode)) 577 return acl ? -EACCES : 0; 578 name = XATTR_NAME_POSIX_ACL_DEFAULT; 579 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 580 break; 581 582 default: 583 return -EINVAL; 584 } 585 586 if (!acl) { 587 /* Remove xattr if it can be presented via mode. */ 588 size = 0; 589 value = NULL; 590 flags = XATTR_REPLACE; 591 } else { 592 size = posix_acl_xattr_size(acl->a_count); 593 value = kmalloc(size, GFP_NOFS); 594 if (!value) 595 return -ENOMEM; 596 err = posix_acl_to_xattr(&init_user_ns, acl, value, size); 597 if (err < 0) 598 goto out; 599 flags = 0; 600 } 601 602 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0); 603 if (err == -ENODATA && !size) 604 err = 0; /* Removing non existed xattr. */ 605 if (!err) { 606 set_cached_acl(inode, type, acl); 607 if (inode->i_mode != mode) { 608 inode->i_mode = mode; 609 mark_inode_dirty(inode); 610 } 611 } 612 613 out: 614 kfree(value); 615 616 return err; 617 } 618 619 /* 620 * ntfs_set_acl - inode_operations::set_acl 621 */ 622 int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, 623 struct posix_acl *acl, int type) 624 { 625 return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false); 626 } 627 628 /* 629 * ntfs_init_acl - Initialize the ACLs of a new inode. 630 * 631 * Called from ntfs_create_inode(). 632 */ 633 int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, 634 struct inode *dir) 635 { 636 struct posix_acl *default_acl, *acl; 637 int err; 638 639 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 640 if (err) 641 return err; 642 643 if (default_acl) { 644 err = ntfs_set_acl_ex(mnt_userns, inode, default_acl, 645 ACL_TYPE_DEFAULT, true); 646 posix_acl_release(default_acl); 647 } else { 648 inode->i_default_acl = NULL; 649 } 650 651 if (acl) { 652 if (!err) 653 err = ntfs_set_acl_ex(mnt_userns, inode, acl, 654 ACL_TYPE_ACCESS, true); 655 posix_acl_release(acl); 656 } else { 657 inode->i_acl = NULL; 658 } 659 660 return err; 661 } 662 #endif 663 664 /* 665 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 666 */ 667 int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode) 668 { 669 struct super_block *sb = inode->i_sb; 670 671 if (!(sb->s_flags & SB_POSIXACL)) 672 return 0; 673 674 if (S_ISLNK(inode->i_mode)) 675 return -EOPNOTSUPP; 676 677 return posix_acl_chmod(mnt_userns, inode, inode->i_mode); 678 } 679 680 /* 681 * ntfs_permission - inode_operations::permission 682 */ 683 int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 684 int mask) 685 { 686 if (ntfs_sb(inode->i_sb)->options->noacsrules) { 687 /* "No access rules" mode - Allow all changes. */ 688 return 0; 689 } 690 691 return generic_permission(mnt_userns, inode, mask); 692 } 693 694 /* 695 * ntfs_listxattr - inode_operations::listxattr 696 */ 697 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 698 { 699 struct inode *inode = d_inode(dentry); 700 struct ntfs_inode *ni = ntfs_i(inode); 701 ssize_t ret; 702 703 if (!(ni->ni_flags & NI_FLAG_EA)) { 704 /* no xattr in file */ 705 return 0; 706 } 707 708 ni_lock(ni); 709 710 ret = ntfs_list_ea(ni, buffer, size); 711 712 ni_unlock(ni); 713 714 return ret; 715 } 716 717 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 718 struct inode *inode, const char *name, void *buffer, 719 size_t size) 720 { 721 int err; 722 struct ntfs_inode *ni = ntfs_i(inode); 723 size_t name_len = strlen(name); 724 725 /* Dispatch request. */ 726 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 727 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 728 /* system.dos_attrib */ 729 if (!buffer) { 730 err = sizeof(u8); 731 } else if (size < sizeof(u8)) { 732 err = -ENODATA; 733 } else { 734 err = sizeof(u8); 735 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 736 } 737 goto out; 738 } 739 740 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 741 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 742 /* system.ntfs_attrib */ 743 if (!buffer) { 744 err = sizeof(u32); 745 } else if (size < sizeof(u32)) { 746 err = -ENODATA; 747 } else { 748 err = sizeof(u32); 749 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 750 } 751 goto out; 752 } 753 754 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 755 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 756 /* system.ntfs_security*/ 757 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 758 size_t sd_size = 0; 759 760 if (!is_ntfs3(ni->mi.sbi)) { 761 /* We should get nt4 security. */ 762 err = -EINVAL; 763 goto out; 764 } else if (le32_to_cpu(ni->std_security_id) < 765 SECURITY_ID_FIRST) { 766 err = -ENOENT; 767 goto out; 768 } 769 770 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 771 &sd, &sd_size); 772 if (err) 773 goto out; 774 775 if (!is_sd_valid(sd, sd_size)) { 776 ntfs_inode_warn( 777 inode, 778 "looks like you get incorrect security descriptor id=%u", 779 ni->std_security_id); 780 } 781 782 if (!buffer) { 783 err = sd_size; 784 } else if (size < sd_size) { 785 err = -ENODATA; 786 } else { 787 err = sd_size; 788 memcpy(buffer, sd, sd_size); 789 } 790 kfree(sd); 791 goto out; 792 } 793 794 /* Deal with NTFS extended attribute. */ 795 err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL); 796 797 out: 798 return err; 799 } 800 801 /* 802 * ntfs_setxattr - inode_operations::setxattr 803 */ 804 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 805 struct user_namespace *mnt_userns, 806 struct dentry *de, struct inode *inode, 807 const char *name, const void *value, 808 size_t size, int flags) 809 { 810 int err = -EINVAL; 811 struct ntfs_inode *ni = ntfs_i(inode); 812 size_t name_len = strlen(name); 813 enum FILE_ATTRIBUTE new_fa; 814 815 /* Dispatch request. */ 816 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 817 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 818 if (sizeof(u8) != size) 819 goto out; 820 new_fa = cpu_to_le32(*(u8 *)value); 821 goto set_new_fa; 822 } 823 824 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 825 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 826 if (size != sizeof(u32)) 827 goto out; 828 new_fa = cpu_to_le32(*(u32 *)value); 829 830 if (S_ISREG(inode->i_mode)) { 831 /* Process compressed/sparsed in special way. */ 832 ni_lock(ni); 833 err = ni_new_attr_flags(ni, new_fa); 834 ni_unlock(ni); 835 if (err) 836 goto out; 837 } 838 set_new_fa: 839 /* 840 * Thanks Mark Harmstone: 841 * Keep directory bit consistency. 842 */ 843 if (S_ISDIR(inode->i_mode)) 844 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 845 else 846 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 847 848 if (ni->std_fa != new_fa) { 849 ni->std_fa = new_fa; 850 if (new_fa & FILE_ATTRIBUTE_READONLY) 851 inode->i_mode &= ~0222; 852 else 853 inode->i_mode |= 0222; 854 /* Std attribute always in primary record. */ 855 ni->mi.dirty = true; 856 mark_inode_dirty(inode); 857 } 858 err = 0; 859 860 goto out; 861 } 862 863 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 864 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 865 /* system.ntfs_security*/ 866 __le32 security_id; 867 bool inserted; 868 struct ATTR_STD_INFO5 *std; 869 870 if (!is_ntfs3(ni->mi.sbi)) { 871 /* 872 * We should replace ATTR_SECURE. 873 * Skip this way cause it is nt4 feature. 874 */ 875 err = -EINVAL; 876 goto out; 877 } 878 879 if (!is_sd_valid(value, size)) { 880 err = -EINVAL; 881 ntfs_inode_warn( 882 inode, 883 "you try to set invalid security descriptor"); 884 goto out; 885 } 886 887 err = ntfs_insert_security(ni->mi.sbi, value, size, 888 &security_id, &inserted); 889 if (err) 890 goto out; 891 892 ni_lock(ni); 893 std = ni_std5(ni); 894 if (!std) { 895 err = -EINVAL; 896 } else if (std->security_id != security_id) { 897 std->security_id = ni->std_security_id = security_id; 898 /* Std attribute always in primary record. */ 899 ni->mi.dirty = true; 900 mark_inode_dirty(&ni->vfs_inode); 901 } 902 ni_unlock(ni); 903 goto out; 904 } 905 906 /* Deal with NTFS extended attribute. */ 907 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0); 908 909 out: 910 inode->i_ctime = current_time(inode); 911 mark_inode_dirty(inode); 912 913 return err; 914 } 915 916 /* 917 * ntfs_save_wsl_perm 918 * 919 * save uid/gid/mode in xattr 920 */ 921 int ntfs_save_wsl_perm(struct inode *inode) 922 { 923 int err; 924 __le32 value; 925 struct ntfs_inode *ni = ntfs_i(inode); 926 927 ni_lock(ni); 928 value = cpu_to_le32(i_uid_read(inode)); 929 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 930 sizeof(value), 0, true); /* true == already locked. */ 931 if (err) 932 goto out; 933 934 value = cpu_to_le32(i_gid_read(inode)); 935 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 936 sizeof(value), 0, true); 937 if (err) 938 goto out; 939 940 value = cpu_to_le32(inode->i_mode); 941 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 942 sizeof(value), 0, true); 943 if (err) 944 goto out; 945 946 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 947 value = cpu_to_le32(inode->i_rdev); 948 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 949 sizeof(value), 0, true); 950 if (err) 951 goto out; 952 } 953 954 out: 955 ni_unlock(ni); 956 /* In case of error should we delete all WSL xattr? */ 957 return err; 958 } 959 960 /* 961 * ntfs_get_wsl_perm 962 * 963 * get uid/gid/mode from xattr 964 * it is called from ntfs_iget5->ntfs_read_mft 965 */ 966 void ntfs_get_wsl_perm(struct inode *inode) 967 { 968 size_t sz; 969 __le32 value[3]; 970 971 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 972 sizeof(value[0]), &sz) == sizeof(value[0]) && 973 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 974 sizeof(value[1]), &sz) == sizeof(value[1]) && 975 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 976 sizeof(value[2]), &sz) == sizeof(value[2])) { 977 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 978 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 979 inode->i_mode = le32_to_cpu(value[2]); 980 981 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 982 &value[0], sizeof(value), 983 &sz) == sizeof(value[0])) { 984 inode->i_rdev = le32_to_cpu(value[0]); 985 } 986 } 987 } 988 989 static bool ntfs_xattr_user_list(struct dentry *dentry) 990 { 991 return true; 992 } 993 994 // clang-format off 995 static const struct xattr_handler ntfs_other_xattr_handler = { 996 .prefix = "", 997 .get = ntfs_getxattr, 998 .set = ntfs_setxattr, 999 .list = ntfs_xattr_user_list, 1000 }; 1001 1002 const struct xattr_handler *ntfs_xattr_handlers[] = { 1003 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1004 &posix_acl_access_xattr_handler, 1005 &posix_acl_default_xattr_handler, 1006 #endif 1007 &ntfs_other_xattr_handler, 1008 NULL, 1009 }; 1010 // clang-format on 1011