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 __le16 *ea_size) 301 { 302 struct ntfs_inode *ni = ntfs_i(inode); 303 struct ntfs_sb_info *sbi = ni->mi.sbi; 304 int err; 305 struct EA_INFO ea_info; 306 const struct EA_INFO *info; 307 struct EA_FULL *new_ea; 308 struct EA_FULL *ea_all = NULL; 309 size_t add, new_pack; 310 u32 off, size, ea_sz; 311 __le16 size_pack; 312 struct ATTRIB *attr; 313 struct ATTR_LIST_ENTRY *le; 314 struct mft_inode *mi; 315 struct runs_tree ea_run; 316 u64 new_sz; 317 void *p; 318 319 if (!locked) 320 ni_lock(ni); 321 322 run_init(&ea_run); 323 324 if (name_len > 255) { 325 err = -ENAMETOOLONG; 326 goto out; 327 } 328 329 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4); 330 331 err = ntfs_read_ea(ni, &ea_all, add, &info); 332 if (err) 333 goto out; 334 335 if (!info) { 336 memset(&ea_info, 0, sizeof(ea_info)); 337 size = 0; 338 size_pack = 0; 339 } else { 340 memcpy(&ea_info, info, sizeof(ea_info)); 341 size = le32_to_cpu(ea_info.size); 342 size_pack = ea_info.size_pack; 343 } 344 345 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) { 346 struct EA_FULL *ea; 347 348 if (flags & XATTR_CREATE) { 349 err = -EEXIST; 350 goto out; 351 } 352 353 ea = Add2Ptr(ea_all, off); 354 355 /* 356 * Check simple case when we try to insert xattr with the same value 357 * e.g. ntfs_save_wsl_perm 358 */ 359 if (val_size && le16_to_cpu(ea->elength) == val_size && 360 !memcmp(ea->name + ea->name_len + 1, value, val_size)) { 361 /* xattr already contains the required value. */ 362 goto out; 363 } 364 365 /* Remove current xattr. */ 366 if (ea->flags & FILE_NEED_EA) 367 le16_add_cpu(&ea_info.count, -1); 368 369 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea)); 370 371 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz); 372 373 size -= ea_sz; 374 memset(Add2Ptr(ea_all, size), 0, ea_sz); 375 376 ea_info.size = cpu_to_le32(size); 377 378 if ((flags & XATTR_REPLACE) && !val_size) { 379 /* Remove xattr. */ 380 goto update_ea; 381 } 382 } else { 383 if (flags & XATTR_REPLACE) { 384 err = -ENODATA; 385 goto out; 386 } 387 388 if (!ea_all) { 389 ea_all = kzalloc(add, GFP_NOFS); 390 if (!ea_all) { 391 err = -ENOMEM; 392 goto out; 393 } 394 } 395 } 396 397 /* Append new xattr. */ 398 new_ea = Add2Ptr(ea_all, size); 399 new_ea->size = cpu_to_le32(add); 400 new_ea->flags = 0; 401 new_ea->name_len = name_len; 402 new_ea->elength = cpu_to_le16(val_size); 403 memcpy(new_ea->name, name, name_len); 404 new_ea->name[name_len] = 0; 405 memcpy(new_ea->name + name_len + 1, value, val_size); 406 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea); 407 ea_info.size_pack = cpu_to_le16(new_pack); 408 /* New size of ATTR_EA. */ 409 size += add; 410 ea_info.size = cpu_to_le32(size); 411 412 /* 413 * 1. Check ea_info.size_pack for overflow. 414 * 2. New attribute size must fit value from $AttrDef 415 */ 416 if (new_pack > 0xffff || size > sbi->ea_max_size) { 417 ntfs_inode_warn( 418 inode, 419 "The size of extended attributes must not exceed 64KiB"); 420 err = -EFBIG; // -EINVAL? 421 goto out; 422 } 423 424 update_ea: 425 426 if (!info) { 427 /* Create xattr. */ 428 if (!size) { 429 err = 0; 430 goto out; 431 } 432 433 err = ni_insert_resident(ni, sizeof(struct EA_INFO), 434 ATTR_EA_INFO, NULL, 0, NULL, NULL, 435 NULL); 436 if (err) 437 goto out; 438 439 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL, 440 NULL); 441 if (err) 442 goto out; 443 } 444 445 new_sz = size; 446 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz, 447 false, NULL); 448 if (err) 449 goto out; 450 451 le = NULL; 452 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi); 453 if (!attr) { 454 err = -EINVAL; 455 goto out; 456 } 457 458 if (!size) { 459 /* Delete xattr, ATTR_EA_INFO */ 460 ni_remove_attr_le(ni, attr, mi, le); 461 } else { 462 p = resident_data_ex(attr, sizeof(struct EA_INFO)); 463 if (!p) { 464 err = -EINVAL; 465 goto out; 466 } 467 memcpy(p, &ea_info, sizeof(struct EA_INFO)); 468 mi->dirty = true; 469 } 470 471 le = NULL; 472 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi); 473 if (!attr) { 474 err = -EINVAL; 475 goto out; 476 } 477 478 if (!size) { 479 /* Delete xattr, ATTR_EA */ 480 ni_remove_attr_le(ni, attr, mi, le); 481 } else if (attr->non_res) { 482 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0, 483 size); 484 if (err) 485 goto out; 486 487 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0); 488 if (err) 489 goto out; 490 } else { 491 p = resident_data_ex(attr, size); 492 if (!p) { 493 err = -EINVAL; 494 goto out; 495 } 496 memcpy(p, ea_all, size); 497 mi->dirty = true; 498 } 499 500 /* Check if we delete the last xattr. */ 501 if (size) 502 ni->ni_flags |= NI_FLAG_EA; 503 else 504 ni->ni_flags &= ~NI_FLAG_EA; 505 506 if (ea_info.size_pack != size_pack) 507 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 508 if (ea_size) 509 *ea_size = ea_info.size_pack; 510 mark_inode_dirty(&ni->vfs_inode); 511 512 out: 513 if (!locked) 514 ni_unlock(ni); 515 516 run_close(&ea_run); 517 kfree(ea_all); 518 519 return err; 520 } 521 522 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 523 524 /* 525 * ntfs_get_acl - inode_operations::get_acl 526 */ 527 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, 528 struct dentry *dentry, int type) 529 { 530 struct inode *inode = d_inode(dentry); 531 struct ntfs_inode *ni = ntfs_i(inode); 532 const char *name; 533 size_t name_len; 534 struct posix_acl *acl; 535 size_t req; 536 int err; 537 void *buf; 538 539 /* Allocate PATH_MAX bytes. */ 540 buf = __getname(); 541 if (!buf) 542 return ERR_PTR(-ENOMEM); 543 544 /* Possible values of 'type' was already checked above. */ 545 if (type == ACL_TYPE_ACCESS) { 546 name = XATTR_NAME_POSIX_ACL_ACCESS; 547 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 548 } else { 549 name = XATTR_NAME_POSIX_ACL_DEFAULT; 550 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 551 } 552 553 ni_lock(ni); 554 555 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req); 556 557 ni_unlock(ni); 558 559 /* Translate extended attribute to acl. */ 560 if (err >= 0) { 561 acl = posix_acl_from_xattr(&init_user_ns, buf, err); 562 } else if (err == -ENODATA) { 563 acl = NULL; 564 } else { 565 acl = ERR_PTR(err); 566 } 567 568 if (!IS_ERR(acl)) 569 set_cached_acl(inode, type, acl); 570 571 __putname(buf); 572 573 return acl; 574 } 575 576 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap, 577 struct inode *inode, struct posix_acl *acl, 578 int type, bool init_acl) 579 { 580 const char *name; 581 size_t size, name_len; 582 void *value; 583 int err; 584 int flags; 585 umode_t mode; 586 587 if (S_ISLNK(inode->i_mode)) 588 return -EOPNOTSUPP; 589 590 mode = inode->i_mode; 591 switch (type) { 592 case ACL_TYPE_ACCESS: 593 /* Do not change i_mode if we are in init_acl */ 594 if (acl && !init_acl) { 595 err = posix_acl_update_mode(idmap, inode, &mode, 596 &acl); 597 if (err) 598 return err; 599 } 600 name = XATTR_NAME_POSIX_ACL_ACCESS; 601 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1; 602 break; 603 604 case ACL_TYPE_DEFAULT: 605 if (!S_ISDIR(inode->i_mode)) 606 return acl ? -EACCES : 0; 607 name = XATTR_NAME_POSIX_ACL_DEFAULT; 608 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1; 609 break; 610 611 default: 612 return -EINVAL; 613 } 614 615 if (!acl) { 616 /* Remove xattr if it can be presented via mode. */ 617 size = 0; 618 value = NULL; 619 flags = XATTR_REPLACE; 620 } else { 621 size = posix_acl_xattr_size(acl->a_count); 622 value = kmalloc(size, GFP_NOFS); 623 if (!value) 624 return -ENOMEM; 625 err = posix_acl_to_xattr(&init_user_ns, acl, value, size); 626 if (err < 0) 627 goto out; 628 flags = 0; 629 } 630 631 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL); 632 if (err == -ENODATA && !size) 633 err = 0; /* Removing non existed xattr. */ 634 if (!err) { 635 set_cached_acl(inode, type, acl); 636 inode->i_mode = mode; 637 inode->i_ctime = current_time(inode); 638 mark_inode_dirty(inode); 639 } 640 641 out: 642 kfree(value); 643 644 return err; 645 } 646 647 /* 648 * ntfs_set_acl - inode_operations::set_acl 649 */ 650 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 651 struct posix_acl *acl, int type) 652 { 653 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false); 654 } 655 656 /* 657 * ntfs_init_acl - Initialize the ACLs of a new inode. 658 * 659 * Called from ntfs_create_inode(). 660 */ 661 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode, 662 struct inode *dir) 663 { 664 struct posix_acl *default_acl, *acl; 665 int err; 666 667 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 668 if (err) 669 return err; 670 671 if (default_acl) { 672 err = ntfs_set_acl_ex(idmap, inode, default_acl, 673 ACL_TYPE_DEFAULT, true); 674 posix_acl_release(default_acl); 675 } else { 676 inode->i_default_acl = NULL; 677 } 678 679 if (acl) { 680 if (!err) 681 err = ntfs_set_acl_ex(idmap, inode, acl, 682 ACL_TYPE_ACCESS, true); 683 posix_acl_release(acl); 684 } else { 685 inode->i_acl = NULL; 686 } 687 688 return err; 689 } 690 #endif 691 692 /* 693 * ntfs_acl_chmod - Helper for ntfs3_setattr(). 694 */ 695 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry) 696 { 697 struct inode *inode = d_inode(dentry); 698 struct super_block *sb = inode->i_sb; 699 700 if (!(sb->s_flags & SB_POSIXACL)) 701 return 0; 702 703 if (S_ISLNK(inode->i_mode)) 704 return -EOPNOTSUPP; 705 706 return posix_acl_chmod(idmap, dentry, inode->i_mode); 707 } 708 709 /* 710 * ntfs_listxattr - inode_operations::listxattr 711 */ 712 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 713 { 714 struct inode *inode = d_inode(dentry); 715 struct ntfs_inode *ni = ntfs_i(inode); 716 ssize_t ret; 717 718 if (!(ni->ni_flags & NI_FLAG_EA)) { 719 /* no xattr in file */ 720 return 0; 721 } 722 723 ni_lock(ni); 724 725 ret = ntfs_list_ea(ni, buffer, size); 726 727 ni_unlock(ni); 728 729 return ret; 730 } 731 732 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de, 733 struct inode *inode, const char *name, void *buffer, 734 size_t size) 735 { 736 int err; 737 struct ntfs_inode *ni = ntfs_i(inode); 738 739 /* Dispatch request. */ 740 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 741 /* system.dos_attrib */ 742 if (!buffer) { 743 err = sizeof(u8); 744 } else if (size < sizeof(u8)) { 745 err = -ENODATA; 746 } else { 747 err = sizeof(u8); 748 *(u8 *)buffer = le32_to_cpu(ni->std_fa); 749 } 750 goto out; 751 } 752 753 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 754 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 755 /* system.ntfs_attrib */ 756 if (!buffer) { 757 err = sizeof(u32); 758 } else if (size < sizeof(u32)) { 759 err = -ENODATA; 760 } else { 761 err = sizeof(u32); 762 *(u32 *)buffer = le32_to_cpu(ni->std_fa); 763 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 764 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer); 765 } 766 goto out; 767 } 768 769 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 770 /* system.ntfs_security*/ 771 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL; 772 size_t sd_size = 0; 773 774 if (!is_ntfs3(ni->mi.sbi)) { 775 /* We should get nt4 security. */ 776 err = -EINVAL; 777 goto out; 778 } else if (le32_to_cpu(ni->std_security_id) < 779 SECURITY_ID_FIRST) { 780 err = -ENOENT; 781 goto out; 782 } 783 784 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id, 785 &sd, &sd_size); 786 if (err) 787 goto out; 788 789 if (!is_sd_valid(sd, sd_size)) { 790 ntfs_inode_warn( 791 inode, 792 "looks like you get incorrect security descriptor id=%u", 793 ni->std_security_id); 794 } 795 796 if (!buffer) { 797 err = sd_size; 798 } else if (size < sd_size) { 799 err = -ENODATA; 800 } else { 801 err = sd_size; 802 memcpy(buffer, sd, sd_size); 803 } 804 kfree(sd); 805 goto out; 806 } 807 808 /* Deal with NTFS extended attribute. */ 809 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL); 810 811 out: 812 return err; 813 } 814 815 /* 816 * ntfs_setxattr - inode_operations::setxattr 817 */ 818 static noinline int ntfs_setxattr(const struct xattr_handler *handler, 819 struct mnt_idmap *idmap, 820 struct dentry *de, struct inode *inode, 821 const char *name, const void *value, 822 size_t size, int flags) 823 { 824 int err = -EINVAL; 825 struct ntfs_inode *ni = ntfs_i(inode); 826 enum FILE_ATTRIBUTE new_fa; 827 828 /* Dispatch request. */ 829 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) { 830 if (sizeof(u8) != size) 831 goto out; 832 new_fa = cpu_to_le32(*(u8 *)value); 833 goto set_new_fa; 834 } 835 836 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) || 837 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) { 838 if (size != sizeof(u32)) 839 goto out; 840 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) 841 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value)); 842 else 843 new_fa = cpu_to_le32(*(u32 *)value); 844 845 if (S_ISREG(inode->i_mode)) { 846 /* Process compressed/sparsed in special way. */ 847 ni_lock(ni); 848 err = ni_new_attr_flags(ni, new_fa); 849 ni_unlock(ni); 850 if (err) 851 goto out; 852 } 853 set_new_fa: 854 /* 855 * Thanks Mark Harmstone: 856 * Keep directory bit consistency. 857 */ 858 if (S_ISDIR(inode->i_mode)) 859 new_fa |= FILE_ATTRIBUTE_DIRECTORY; 860 else 861 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 862 863 if (ni->std_fa != new_fa) { 864 ni->std_fa = new_fa; 865 if (new_fa & FILE_ATTRIBUTE_READONLY) 866 inode->i_mode &= ~0222; 867 else 868 inode->i_mode |= 0222; 869 /* Std attribute always in primary record. */ 870 ni->mi.dirty = true; 871 mark_inode_dirty(inode); 872 } 873 err = 0; 874 875 goto out; 876 } 877 878 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) { 879 /* system.ntfs_security*/ 880 __le32 security_id; 881 bool inserted; 882 struct ATTR_STD_INFO5 *std; 883 884 if (!is_ntfs3(ni->mi.sbi)) { 885 /* 886 * We should replace ATTR_SECURE. 887 * Skip this way cause it is nt4 feature. 888 */ 889 err = -EINVAL; 890 goto out; 891 } 892 893 if (!is_sd_valid(value, size)) { 894 err = -EINVAL; 895 ntfs_inode_warn( 896 inode, 897 "you try to set invalid security descriptor"); 898 goto out; 899 } 900 901 err = ntfs_insert_security(ni->mi.sbi, value, size, 902 &security_id, &inserted); 903 if (err) 904 goto out; 905 906 ni_lock(ni); 907 std = ni_std5(ni); 908 if (!std) { 909 err = -EINVAL; 910 } else if (std->security_id != security_id) { 911 std->security_id = ni->std_security_id = security_id; 912 /* Std attribute always in primary record. */ 913 ni->mi.dirty = true; 914 mark_inode_dirty(&ni->vfs_inode); 915 } 916 ni_unlock(ni); 917 goto out; 918 } 919 920 /* Deal with NTFS extended attribute. */ 921 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0, 922 NULL); 923 924 out: 925 inode->i_ctime = current_time(inode); 926 mark_inode_dirty(inode); 927 928 return err; 929 } 930 931 /* 932 * ntfs_save_wsl_perm 933 * 934 * save uid/gid/mode in xattr 935 */ 936 int ntfs_save_wsl_perm(struct inode *inode, __le16 *ea_size) 937 { 938 int err; 939 __le32 value; 940 struct ntfs_inode *ni = ntfs_i(inode); 941 942 ni_lock(ni); 943 value = cpu_to_le32(i_uid_read(inode)); 944 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value, 945 sizeof(value), 0, true, ea_size); 946 if (err) 947 goto out; 948 949 value = cpu_to_le32(i_gid_read(inode)); 950 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value, 951 sizeof(value), 0, true, ea_size); 952 if (err) 953 goto out; 954 955 value = cpu_to_le32(inode->i_mode); 956 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value, 957 sizeof(value), 0, true, ea_size); 958 if (err) 959 goto out; 960 961 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { 962 value = cpu_to_le32(inode->i_rdev); 963 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value, 964 sizeof(value), 0, true, ea_size); 965 if (err) 966 goto out; 967 } 968 969 out: 970 ni_unlock(ni); 971 /* In case of error should we delete all WSL xattr? */ 972 return err; 973 } 974 975 /* 976 * ntfs_get_wsl_perm 977 * 978 * get uid/gid/mode from xattr 979 * it is called from ntfs_iget5->ntfs_read_mft 980 */ 981 void ntfs_get_wsl_perm(struct inode *inode) 982 { 983 size_t sz; 984 __le32 value[3]; 985 986 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0], 987 sizeof(value[0]), &sz) == sizeof(value[0]) && 988 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1], 989 sizeof(value[1]), &sz) == sizeof(value[1]) && 990 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2], 991 sizeof(value[2]), &sz) == sizeof(value[2])) { 992 i_uid_write(inode, (uid_t)le32_to_cpu(value[0])); 993 i_gid_write(inode, (gid_t)le32_to_cpu(value[1])); 994 inode->i_mode = le32_to_cpu(value[2]); 995 996 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1, 997 &value[0], sizeof(value), 998 &sz) == sizeof(value[0])) { 999 inode->i_rdev = le32_to_cpu(value[0]); 1000 } 1001 } 1002 } 1003 1004 static bool ntfs_xattr_user_list(struct dentry *dentry) 1005 { 1006 return true; 1007 } 1008 1009 // clang-format off 1010 static const struct xattr_handler ntfs_other_xattr_handler = { 1011 .prefix = "", 1012 .get = ntfs_getxattr, 1013 .set = ntfs_setxattr, 1014 .list = ntfs_xattr_user_list, 1015 }; 1016 1017 const struct xattr_handler *ntfs_xattr_handlers[] = { 1018 &ntfs_other_xattr_handler, 1019 NULL, 1020 }; 1021 // clang-format on 1022