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 static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns, 629 struct inode *inode, int type, void *buffer, 630 size_t size) 631 { 632 struct posix_acl *acl; 633 int err; 634 635 if (!(inode->i_sb->s_flags & SB_POSIXACL)) { 636 ntfs_inode_warn(inode, "add mount option \"acl\" to use acl"); 637 return -EOPNOTSUPP; 638 } 639 640 acl = ntfs_get_acl(inode, type, false); 641 if (IS_ERR(acl)) 642 return PTR_ERR(acl); 643 644 if (!acl) 645 return -ENODATA; 646 647 err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); 648 posix_acl_release(acl); 649 650 return err; 651 } 652 653 static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns, 654 struct inode *inode, int type, const void *value, 655 size_t size) 656 { 657 struct posix_acl *acl; 658 int err; 659 660 if (!(inode->i_sb->s_flags & SB_POSIXACL)) { 661 ntfs_inode_warn(inode, "add mount option \"acl\" to use acl"); 662 return -EOPNOTSUPP; 663 } 664 665 if (!inode_owner_or_capable(mnt_userns, inode)) 666 return -EPERM; 667 668 if (!value) { 669 acl = NULL; 670 } else { 671 acl = posix_acl_from_xattr(&init_user_ns, value, size); 672 if (IS_ERR(acl)) 673 return PTR_ERR(acl); 674 675 if (acl) { 676 err = posix_acl_valid(&init_user_ns, acl); 677 if (err) 678 goto release_and_out; 679 } 680 } 681 682 err = ntfs_set_acl(mnt_userns, inode, acl, type); 683 684 release_and_out: 685 posix_acl_release(acl); 686 return err; 687 } 688 689 /* 690 * ntfs_init_acl - Initialize the ACLs of a new inode. 691 * 692 * Called from ntfs_create_inode(). 693 */ 694 int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, 695 struct inode *dir) 696 { 697 struct posix_acl *default_acl, *acl; 698 int err; 699 700 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 701 if (err) 702 return err; 703 704 if (default_acl) { 705 err = ntfs_set_acl_ex(mnt_userns, inode, default_acl, 706 ACL_TYPE_DEFAULT, true); 707 posix_acl_release(default_acl); 708 } else { 709 inode->i_default_acl = NULL; 710 } 711 712 if (acl) { 713 if (!err) 714 err = ntfs_set_acl_ex(mnt_userns, inode, acl, 715 ACL_TYPE_ACCESS, true); 716 posix_acl_release(acl); 717 } else { 718 inode->i_acl = NULL; 719 } 720 721 return err; 722 } 723 #endif 724 725 /* 726 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 727 */ 728 int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode) 729 { 730 struct super_block *sb = inode->i_sb; 731 732 if (!(sb->s_flags & SB_POSIXACL)) 733 return 0; 734 735 if (S_ISLNK(inode->i_mode)) 736 return -EOPNOTSUPP; 737 738 return posix_acl_chmod(mnt_userns, inode, inode->i_mode); 739 } 740 741 /* 742 * ntfs_permission - inode_operations::permission 743 */ 744 int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 745 int mask) 746 { 747 if (ntfs_sb(inode->i_sb)->options->noacsrules) { 748 /* "No access rules" mode - Allow all changes. */ 749 return 0; 750 } 751 752 return generic_permission(mnt_userns, inode, mask); 753 } 754 755 /* 756 * ntfs_listxattr - inode_operations::listxattr 757 */ 758 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 759 { 760 struct inode *inode = d_inode(dentry); 761 struct ntfs_inode *ni = ntfs_i(inode); 762 ssize_t ret; 763 764 if (!(ni->ni_flags & NI_FLAG_EA)) { 765 /* no xattr in file */ 766 return 0; 767 } 768 769 ni_lock(ni); 770 771 ret = ntfs_list_ea(ni, buffer, size); 772 773 ni_unlock(ni); 774 775 return ret; 776 } 777 778 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 779 struct inode *inode, const char *name, void *buffer, 780 size_t size) 781 { 782 int err; 783 struct ntfs_inode *ni = ntfs_i(inode); 784 size_t name_len = strlen(name); 785 786 /* Dispatch request. */ 787 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 788 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 789 /* system.dos_attrib */ 790 if (!buffer) { 791 err = sizeof(u8); 792 } else if (size < sizeof(u8)) { 793 err = -ENODATA; 794 } else { 795 err = sizeof(u8); 796 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 797 } 798 goto out; 799 } 800 801 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 802 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 803 /* system.ntfs_attrib */ 804 if (!buffer) { 805 err = sizeof(u32); 806 } else if (size < sizeof(u32)) { 807 err = -ENODATA; 808 } else { 809 err = sizeof(u32); 810 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 811 } 812 goto out; 813 } 814 815 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 816 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 817 /* system.ntfs_security*/ 818 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 819 size_t sd_size = 0; 820 821 if (!is_ntfs3(ni->mi.sbi)) { 822 /* We should get nt4 security. */ 823 err = -EINVAL; 824 goto out; 825 } else if (le32_to_cpu(ni->std_security_id) < 826 SECURITY_ID_FIRST) { 827 err = -ENOENT; 828 goto out; 829 } 830 831 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 832 &sd, &sd_size); 833 if (err) 834 goto out; 835 836 if (!is_sd_valid(sd, sd_size)) { 837 ntfs_inode_warn( 838 inode, 839 "looks like you get incorrect security descriptor id=%u", 840 ni->std_security_id); 841 } 842 843 if (!buffer) { 844 err = sd_size; 845 } else if (size < sd_size) { 846 err = -ENODATA; 847 } else { 848 err = sd_size; 849 memcpy(buffer, sd, sd_size); 850 } 851 kfree(sd); 852 goto out; 853 } 854 855 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 856 if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 && 857 !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 858 sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) || 859 (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 && 860 !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 861 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) { 862 /* TODO: init_user_ns? */ 863 err = ntfs_xattr_get_acl( 864 &init_user_ns, inode, 865 name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 866 ? ACL_TYPE_ACCESS 867 : ACL_TYPE_DEFAULT, 868 buffer, size); 869 goto out; 870 } 871 #endif 872 /* Deal with NTFS extended attribute. */ 873 err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL); 874 875 out: 876 return err; 877 } 878 879 /* 880 * ntfs_setxattr - inode_operations::setxattr 881 */ 882 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 883 struct user_namespace *mnt_userns, 884 struct dentry *de, struct inode *inode, 885 const char *name, const void *value, 886 size_t size, int flags) 887 { 888 int err = -EINVAL; 889 struct ntfs_inode *ni = ntfs_i(inode); 890 size_t name_len = strlen(name); 891 enum FILE_ATTRIBUTE new_fa; 892 893 /* Dispatch request. */ 894 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 895 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 896 if (sizeof(u8) != size) 897 goto out; 898 new_fa = cpu_to_le32(*(u8 *)value); 899 goto set_new_fa; 900 } 901 902 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 903 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 904 if (size != sizeof(u32)) 905 goto out; 906 new_fa = cpu_to_le32(*(u32 *)value); 907 908 if (S_ISREG(inode->i_mode)) { 909 /* Process compressed/sparsed in special way. */ 910 ni_lock(ni); 911 err = ni_new_attr_flags(ni, new_fa); 912 ni_unlock(ni); 913 if (err) 914 goto out; 915 } 916 set_new_fa: 917 /* 918 * Thanks Mark Harmstone: 919 * Keep directory bit consistency. 920 */ 921 if (S_ISDIR(inode->i_mode)) 922 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 923 else 924 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 925 926 if (ni->std_fa != new_fa) { 927 ni->std_fa = new_fa; 928 if (new_fa & FILE_ATTRIBUTE_READONLY) 929 inode->i_mode &= ~0222; 930 else 931 inode->i_mode |= 0222; 932 /* Std attribute always in primary record. */ 933 ni->mi.dirty = true; 934 mark_inode_dirty(inode); 935 } 936 err = 0; 937 938 goto out; 939 } 940 941 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 942 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 943 /* system.ntfs_security*/ 944 __le32 security_id; 945 bool inserted; 946 struct ATTR_STD_INFO5 *std; 947 948 if (!is_ntfs3(ni->mi.sbi)) { 949 /* 950 * We should replace ATTR_SECURE. 951 * Skip this way cause it is nt4 feature. 952 */ 953 err = -EINVAL; 954 goto out; 955 } 956 957 if (!is_sd_valid(value, size)) { 958 err = -EINVAL; 959 ntfs_inode_warn( 960 inode, 961 "you try to set invalid security descriptor"); 962 goto out; 963 } 964 965 err = ntfs_insert_security(ni->mi.sbi, value, size, 966 &security_id, &inserted); 967 if (err) 968 goto out; 969 970 ni_lock(ni); 971 std = ni_std5(ni); 972 if (!std) { 973 err = -EINVAL; 974 } else if (std->security_id != security_id) { 975 std->security_id = ni->std_security_id = security_id; 976 /* Std attribute always in primary record. */ 977 ni->mi.dirty = true; 978 mark_inode_dirty(&ni->vfs_inode); 979 } 980 ni_unlock(ni); 981 goto out; 982 } 983 984 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 985 if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 && 986 !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 987 sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) || 988 (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 && 989 !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 990 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) { 991 err = ntfs_xattr_set_acl( 992 mnt_userns, inode, 993 name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 994 ? ACL_TYPE_ACCESS 995 : ACL_TYPE_DEFAULT, 996 value, size); 997 goto out; 998 } 999 #endif 1000 /* Deal with NTFS extended attribute. */ 1001 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0); 1002 1003 out: 1004 inode->i_ctime = current_time(inode); 1005 mark_inode_dirty(inode); 1006 1007 return err; 1008 } 1009 1010 /* 1011 * ntfs_save_wsl_perm 1012 * 1013 * save uid/gid/mode in xattr 1014 */ 1015 int ntfs_save_wsl_perm(struct inode *inode) 1016 { 1017 int err; 1018 __le32 value; 1019 struct ntfs_inode *ni = ntfs_i(inode); 1020 1021 ni_lock(ni); 1022 value = cpu_to_le32(i_uid_read(inode)); 1023 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 1024 sizeof(value), 0, true); /* true == already locked. */ 1025 if (err) 1026 goto out; 1027 1028 value = cpu_to_le32(i_gid_read(inode)); 1029 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 1030 sizeof(value), 0, true); 1031 if (err) 1032 goto out; 1033 1034 value = cpu_to_le32(inode->i_mode); 1035 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 1036 sizeof(value), 0, true); 1037 if (err) 1038 goto out; 1039 1040 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1041 value = cpu_to_le32(inode->i_rdev); 1042 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 1043 sizeof(value), 0, true); 1044 if (err) 1045 goto out; 1046 } 1047 1048 out: 1049 ni_unlock(ni); 1050 /* In case of error should we delete all WSL xattr? */ 1051 return err; 1052 } 1053 1054 /* 1055 * ntfs_get_wsl_perm 1056 * 1057 * get uid/gid/mode from xattr 1058 * it is called from ntfs_iget5->ntfs_read_mft 1059 */ 1060 void ntfs_get_wsl_perm(struct inode *inode) 1061 { 1062 size_t sz; 1063 __le32 value[3]; 1064 1065 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 1066 sizeof(value[0]), &sz) == sizeof(value[0]) && 1067 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 1068 sizeof(value[1]), &sz) == sizeof(value[1]) && 1069 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 1070 sizeof(value[2]), &sz) == sizeof(value[2])) { 1071 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1072 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1073 inode->i_mode = le32_to_cpu(value[2]); 1074 1075 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1076 &value[0], sizeof(value), 1077 &sz) == sizeof(value[0])) { 1078 inode->i_rdev = le32_to_cpu(value[0]); 1079 } 1080 } 1081 } 1082 1083 static bool ntfs_xattr_user_list(struct dentry *dentry) 1084 { 1085 return true; 1086 } 1087 1088 // clang-format off 1089 static const struct xattr_handler ntfs_xattr_handler = { 1090 .prefix = "", 1091 .get = ntfs_getxattr, 1092 .set = ntfs_setxattr, 1093 .list = ntfs_xattr_user_list, 1094 }; 1095 1096 const struct xattr_handler *ntfs_xattr_handlers[] = { 1097 &ntfs_xattr_handler, 1098 NULL, 1099 }; 1100 // clang-format on 1101