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(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, 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 = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 448 if (err) 449 goto out; 450 } else { 451 p = resident_data_ex(attr, size); 452 if (!p) { 453 err = -EINVAL; 454 goto out; 455 } 456 memcpy(p, ea_all, size); 457 mi->dirty = true; 458 } 459 460 /* Check if we delete the last xattr. */ 461 if (size) 462 ni->ni_flags |= NI_FLAG_EA; 463 else 464 ni->ni_flags &= ~NI_FLAG_EA; 465 466 if (ea_info.size_pack != size_pack) 467 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 468 mark_inode_dirty(&ni->vfs_inode); 469 470 out: 471 if (!locked) 472 ni_unlock(ni); 473 474 run_close(&ea_run); 475 kfree(ea_all); 476 477 return err; 478 } 479 480 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 481 static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns, 482 struct inode *inode, int type, 483 int locked) 484 { 485 struct ntfs_inode *ni = ntfs_i(inode); 486 const char *name; 487 size_t name_len; 488 struct posix_acl *acl; 489 size_t req; 490 int err; 491 void *buf; 492 493 /* Allocate PATH_MAX bytes. */ 494 buf = __getname(); 495 if (!buf) 496 return ERR_PTR(-ENOMEM); 497 498 /* Possible values of 'type' was already checked above. */ 499 if (type == ACL_TYPE_ACCESS) { 500 name = XATTR_NAME_POSIX_ACL_ACCESS; 501 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 502 } else { 503 name = XATTR_NAME_POSIX_ACL_DEFAULT; 504 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 505 } 506 507 if (!locked) 508 ni_lock(ni); 509 510 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 511 512 if (!locked) 513 ni_unlock(ni); 514 515 /* Translate extended attribute to acl. */ 516 if (err >= 0) { 517 acl = posix_acl_from_xattr(mnt_userns, buf, err); 518 } else if (err == -ENODATA) { 519 acl = NULL; 520 } else { 521 acl = ERR_PTR(err); 522 } 523 524 if (!IS_ERR(acl)) 525 set_cached_acl(inode, type, acl); 526 527 __putname(buf); 528 529 return acl; 530 } 531 532 /* 533 * ntfs_get_acl - inode_operations::get_acl 534 */ 535 struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu) 536 { 537 if (rcu) 538 return ERR_PTR(-ECHILD); 539 540 /* TODO: init_user_ns? */ 541 return ntfs_get_acl_ex(&init_user_ns, inode, type, 0); 542 } 543 544 static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns, 545 struct inode *inode, struct posix_acl *acl, 546 int type, bool init_acl) 547 { 548 const char *name; 549 size_t size, name_len; 550 void *value = NULL; 551 int err = 0; 552 int flags; 553 554 if (S_ISLNK(inode->i_mode)) 555 return -EOPNOTSUPP; 556 557 switch (type) { 558 case ACL_TYPE_ACCESS: 559 /* Do not change i_mode if we are in init_acl */ 560 if (acl && !init_acl) { 561 umode_t mode; 562 563 err = posix_acl_update_mode(mnt_userns, inode, &mode, 564 &acl); 565 if (err) 566 goto out; 567 568 if (inode->i_mode != mode) { 569 inode->i_mode = mode; 570 mark_inode_dirty(inode); 571 } 572 } 573 name = XATTR_NAME_POSIX_ACL_ACCESS; 574 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 575 break; 576 577 case ACL_TYPE_DEFAULT: 578 if (!S_ISDIR(inode->i_mode)) 579 return acl ? -EACCES : 0; 580 name = XATTR_NAME_POSIX_ACL_DEFAULT; 581 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 582 break; 583 584 default: 585 return -EINVAL; 586 } 587 588 if (!acl) { 589 /* Remove xattr if it can be presented via mode. */ 590 size = 0; 591 value = NULL; 592 flags = XATTR_REPLACE; 593 } else { 594 size = posix_acl_xattr_size(acl->a_count); 595 value = kmalloc(size, GFP_NOFS); 596 if (!value) 597 return -ENOMEM; 598 err = posix_acl_to_xattr(mnt_userns, acl, value, size); 599 if (err < 0) 600 goto out; 601 flags = 0; 602 } 603 604 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0); 605 if (err == -ENODATA && !size) 606 err = 0; /* Removing non existed xattr. */ 607 if (!err) 608 set_cached_acl(inode, type, acl); 609 610 out: 611 kfree(value); 612 613 return err; 614 } 615 616 /* 617 * ntfs_set_acl - inode_operations::set_acl 618 */ 619 int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, 620 struct posix_acl *acl, int type) 621 { 622 return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false); 623 } 624 625 static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns, 626 struct inode *inode, int type, void *buffer, 627 size_t size) 628 { 629 struct posix_acl *acl; 630 int err; 631 632 if (!(inode->i_sb->s_flags & SB_POSIXACL)) { 633 ntfs_inode_warn(inode, "add mount option \"acl\" to use acl"); 634 return -EOPNOTSUPP; 635 } 636 637 acl = ntfs_get_acl(inode, type, false); 638 if (IS_ERR(acl)) 639 return PTR_ERR(acl); 640 641 if (!acl) 642 return -ENODATA; 643 644 err = posix_acl_to_xattr(mnt_userns, acl, buffer, size); 645 posix_acl_release(acl); 646 647 return err; 648 } 649 650 static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns, 651 struct inode *inode, int type, const void *value, 652 size_t size) 653 { 654 struct posix_acl *acl; 655 int err; 656 657 if (!(inode->i_sb->s_flags & SB_POSIXACL)) { 658 ntfs_inode_warn(inode, "add mount option \"acl\" to use acl"); 659 return -EOPNOTSUPP; 660 } 661 662 if (!inode_owner_or_capable(mnt_userns, inode)) 663 return -EPERM; 664 665 if (!value) { 666 acl = NULL; 667 } else { 668 acl = posix_acl_from_xattr(mnt_userns, value, size); 669 if (IS_ERR(acl)) 670 return PTR_ERR(acl); 671 672 if (acl) { 673 err = posix_acl_valid(mnt_userns, acl); 674 if (err) 675 goto release_and_out; 676 } 677 } 678 679 err = ntfs_set_acl(mnt_userns, inode, acl, type); 680 681 release_and_out: 682 posix_acl_release(acl); 683 return err; 684 } 685 686 /* 687 * ntfs_init_acl - Initialize the ACLs of a new inode. 688 * 689 * Called from ntfs_create_inode(). 690 */ 691 int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, 692 struct inode *dir) 693 { 694 struct posix_acl *default_acl, *acl; 695 int err; 696 697 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 698 if (err) 699 return err; 700 701 if (default_acl) { 702 err = ntfs_set_acl_ex(mnt_userns, inode, default_acl, 703 ACL_TYPE_DEFAULT, true); 704 posix_acl_release(default_acl); 705 } else { 706 inode->i_default_acl = NULL; 707 } 708 709 if (!acl) 710 inode->i_acl = NULL; 711 else { 712 if (!err) 713 err = ntfs_set_acl_ex(mnt_userns, inode, acl, 714 ACL_TYPE_ACCESS, true); 715 posix_acl_release(acl); 716 } 717 718 return err; 719 } 720 #endif 721 722 /* 723 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 724 */ 725 int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode) 726 { 727 struct super_block *sb = inode->i_sb; 728 729 if (!(sb->s_flags & SB_POSIXACL)) 730 return 0; 731 732 if (S_ISLNK(inode->i_mode)) 733 return -EOPNOTSUPP; 734 735 return posix_acl_chmod(mnt_userns, inode, inode->i_mode); 736 } 737 738 /* 739 * ntfs_permission - inode_operations::permission 740 */ 741 int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 742 int mask) 743 { 744 if (ntfs_sb(inode->i_sb)->options->noacsrules) { 745 /* "No access rules" mode - Allow all changes. */ 746 return 0; 747 } 748 749 return generic_permission(mnt_userns, inode, mask); 750 } 751 752 /* 753 * ntfs_listxattr - inode_operations::listxattr 754 */ 755 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 756 { 757 struct inode *inode = d_inode(dentry); 758 struct ntfs_inode *ni = ntfs_i(inode); 759 ssize_t ret; 760 761 if (!(ni->ni_flags & NI_FLAG_EA)) { 762 /* no xattr in file */ 763 return 0; 764 } 765 766 ni_lock(ni); 767 768 ret = ntfs_list_ea(ni, buffer, size); 769 770 ni_unlock(ni); 771 772 return ret; 773 } 774 775 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 776 struct inode *inode, const char *name, void *buffer, 777 size_t size) 778 { 779 int err; 780 struct ntfs_inode *ni = ntfs_i(inode); 781 size_t name_len = strlen(name); 782 783 /* Dispatch request. */ 784 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 785 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 786 /* system.dos_attrib */ 787 if (!buffer) { 788 err = sizeof(u8); 789 } else if (size < sizeof(u8)) { 790 err = -ENODATA; 791 } else { 792 err = sizeof(u8); 793 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 794 } 795 goto out; 796 } 797 798 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 799 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 800 /* system.ntfs_attrib */ 801 if (!buffer) { 802 err = sizeof(u32); 803 } else if (size < sizeof(u32)) { 804 err = -ENODATA; 805 } else { 806 err = sizeof(u32); 807 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 808 } 809 goto out; 810 } 811 812 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 813 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 814 /* system.ntfs_security*/ 815 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 816 size_t sd_size = 0; 817 818 if (!is_ntfs3(ni->mi.sbi)) { 819 /* We should get nt4 security. */ 820 err = -EINVAL; 821 goto out; 822 } else if (le32_to_cpu(ni->std_security_id) < 823 SECURITY_ID_FIRST) { 824 err = -ENOENT; 825 goto out; 826 } 827 828 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 829 &sd, &sd_size); 830 if (err) 831 goto out; 832 833 if (!is_sd_valid(sd, sd_size)) { 834 ntfs_inode_warn( 835 inode, 836 "looks like you get incorrect security descriptor id=%u", 837 ni->std_security_id); 838 } 839 840 if (!buffer) { 841 err = sd_size; 842 } else if (size < sd_size) { 843 err = -ENODATA; 844 } else { 845 err = sd_size; 846 memcpy(buffer, sd, sd_size); 847 } 848 kfree(sd); 849 goto out; 850 } 851 852 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 853 if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 && 854 !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 855 sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) || 856 (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 && 857 !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 858 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) { 859 /* TODO: init_user_ns? */ 860 err = ntfs_xattr_get_acl( 861 &init_user_ns, inode, 862 name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 863 ? ACL_TYPE_ACCESS 864 : ACL_TYPE_DEFAULT, 865 buffer, size); 866 goto out; 867 } 868 #endif 869 /* Deal with NTFS extended attribute. */ 870 err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL); 871 872 out: 873 return err; 874 } 875 876 /* 877 * ntfs_setxattr - inode_operations::setxattr 878 */ 879 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 880 struct user_namespace *mnt_userns, 881 struct dentry *de, struct inode *inode, 882 const char *name, const void *value, 883 size_t size, int flags) 884 { 885 int err = -EINVAL; 886 struct ntfs_inode *ni = ntfs_i(inode); 887 size_t name_len = strlen(name); 888 enum FILE_ATTRIBUTE new_fa; 889 890 /* Dispatch request. */ 891 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 && 892 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) { 893 if (sizeof(u8) != size) 894 goto out; 895 new_fa = cpu_to_le32(*(u8 *)value); 896 goto set_new_fa; 897 } 898 899 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 && 900 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) { 901 if (size != sizeof(u32)) 902 goto out; 903 new_fa = cpu_to_le32(*(u32 *)value); 904 905 if (S_ISREG(inode->i_mode)) { 906 /* Process compressed/sparsed in special way. */ 907 ni_lock(ni); 908 err = ni_new_attr_flags(ni, new_fa); 909 ni_unlock(ni); 910 if (err) 911 goto out; 912 } 913 set_new_fa: 914 /* 915 * Thanks Mark Harmstone: 916 * Keep directory bit consistency. 917 */ 918 if (S_ISDIR(inode->i_mode)) 919 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 920 else 921 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 922 923 if (ni->std_fa != new_fa) { 924 ni->std_fa = new_fa; 925 if (new_fa & FILE_ATTRIBUTE_READONLY) 926 inode->i_mode &= ~0222; 927 else 928 inode->i_mode |= 0222; 929 /* Std attribute always in primary record. */ 930 ni->mi.dirty = true; 931 mark_inode_dirty(inode); 932 } 933 err = 0; 934 935 goto out; 936 } 937 938 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 && 939 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) { 940 /* system.ntfs_security*/ 941 __le32 security_id; 942 bool inserted; 943 struct ATTR_STD_INFO5 *std; 944 945 if (!is_ntfs3(ni->mi.sbi)) { 946 /* 947 * We should replace ATTR_SECURE. 948 * Skip this way cause it is nt4 feature. 949 */ 950 err = -EINVAL; 951 goto out; 952 } 953 954 if (!is_sd_valid(value, size)) { 955 err = -EINVAL; 956 ntfs_inode_warn( 957 inode, 958 "you try to set invalid security descriptor"); 959 goto out; 960 } 961 962 err = ntfs_insert_security(ni->mi.sbi, value, size, 963 &security_id, &inserted); 964 if (err) 965 goto out; 966 967 ni_lock(ni); 968 std = ni_std5(ni); 969 if (!std) { 970 err = -EINVAL; 971 } else if (std->security_id != security_id) { 972 std->security_id = ni->std_security_id = security_id; 973 /* Std attribute always in primary record. */ 974 ni->mi.dirty = true; 975 mark_inode_dirty(&ni->vfs_inode); 976 } 977 ni_unlock(ni); 978 goto out; 979 } 980 981 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 982 if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 && 983 !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 984 sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) || 985 (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 && 986 !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 987 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) { 988 err = ntfs_xattr_set_acl( 989 mnt_userns, inode, 990 name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 991 ? ACL_TYPE_ACCESS 992 : ACL_TYPE_DEFAULT, 993 value, size); 994 goto out; 995 } 996 #endif 997 /* Deal with NTFS extended attribute. */ 998 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0); 999 1000 out: 1001 inode->i_ctime = current_time(inode); 1002 mark_inode_dirty(inode); 1003 1004 return err; 1005 } 1006 1007 /* 1008 * ntfs_save_wsl_perm 1009 * 1010 * save uid/gid/mode in xattr 1011 */ 1012 int ntfs_save_wsl_perm(struct inode *inode) 1013 { 1014 int err; 1015 __le32 value; 1016 struct ntfs_inode *ni = ntfs_i(inode); 1017 1018 ni_lock(ni); 1019 value = cpu_to_le32(i_uid_read(inode)); 1020 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 1021 sizeof(value), 0, true); /* true == already locked. */ 1022 if (err) 1023 goto out; 1024 1025 value = cpu_to_le32(i_gid_read(inode)); 1026 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 1027 sizeof(value), 0, true); 1028 if (err) 1029 goto out; 1030 1031 value = cpu_to_le32(inode->i_mode); 1032 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 1033 sizeof(value), 0, true); 1034 if (err) 1035 goto out; 1036 1037 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 1038 value = cpu_to_le32(inode->i_rdev); 1039 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 1040 sizeof(value), 0, true); 1041 if (err) 1042 goto out; 1043 } 1044 1045 out: 1046 ni_unlock(ni); 1047 /* In case of error should we delete all WSL xattr? */ 1048 return err; 1049 } 1050 1051 /* 1052 * ntfs_get_wsl_perm 1053 * 1054 * get uid/gid/mode from xattr 1055 * it is called from ntfs_iget5->ntfs_read_mft 1056 */ 1057 void ntfs_get_wsl_perm(struct inode *inode) 1058 { 1059 size_t sz; 1060 __le32 value[3]; 1061 1062 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 1063 sizeof(value[0]), &sz) == sizeof(value[0]) && 1064 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 1065 sizeof(value[1]), &sz) == sizeof(value[1]) && 1066 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 1067 sizeof(value[2]), &sz) == sizeof(value[2])) { 1068 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 1069 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 1070 inode->i_mode = le32_to_cpu(value[2]); 1071 1072 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 1073 &value[0], sizeof(value), 1074 &sz) == sizeof(value[0])) { 1075 inode->i_rdev = le32_to_cpu(value[0]); 1076 } 1077 } 1078 } 1079 1080 static bool ntfs_xattr_user_list(struct dentry *dentry) 1081 { 1082 return true; 1083 } 1084 1085 // clang-format off 1086 static const struct xattr_handler ntfs_xattr_handler = { 1087 .prefix = "", 1088 .get = ntfs_getxattr, 1089 .set = ntfs_setxattr, 1090 .list = ntfs_xattr_user_list, 1091 }; 1092 1093 const struct xattr_handler *ntfs_xattr_handlers[] = { 1094 &ntfs_xattr_handler, 1095 NULL, 1096 }; 1097 // clang-format on 1098