fs/ntfs3/xattr.c

   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         err = -EINVAL;
 145         /* Check all attributes for consistency. */
 146         for (off = 0; off < size; off += ea_size) {
 147                 const struct EA_FULL *ef = Add2Ptr(ea_p, off);
 148                 u32 bytes = size - off;
 149
 150                 /* Check if we can use field ea->size. */
 151                 if (bytes < sizeof(ef->size))
 152                         goto out1;
 153
 154                 if (ef->size) {
 155                         ea_size = le32_to_cpu(ef->size);
 156                         if (ea_size > bytes)
 157                                 goto out1;
 158                         continue;
 159                 }
 160
 161                 /* Check if we can use fields ef->name_len and ef->elength. */
 162                 if (bytes < offsetof(struct EA_FULL, name))
 163                         goto out1;
 164
 165                 ea_size = ALIGN(struct_size(ef, name,
 166                                             1 + ef->name_len +
 167                                                     le16_to_cpu(ef->elength)),
 168                                 4);
 169                 if (ea_size > bytes)
 170                         goto out1;
 171         }
 172
 173         *ea = ea_p;
 174         return 0;
 175
 176 out1:
 177         kfree(ea_p);
 178 out:
 179         ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
 180         return err;
 181 }
 182
 183 /*
 184  * ntfs_list_ea
 185  *
 186  * Copy a list of xattrs names into the buffer
 187  * provided, or compute the buffer size required.
 188  *
 189  * Return:
 190  * * Number of bytes used / required on
 191  * * -ERRNO - on failure
 192  */
 193 static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
 194                             size_t bytes_per_buffer)
 195 {
 196         const struct EA_INFO *info;
 197         struct EA_FULL *ea_all = NULL;
 198         u32 off, size;
 199         int err;
 200         size_t ret;
 201
 202         err = ntfs_read_ea(ni, &ea_all, 0, &info);
 203         if (err)
 204                 return err;
 205
 206         if (!info || !ea_all)
 207                 return 0;
 208
 209         size = le32_to_cpu(info->size);
 210
 211         /* Enumerate all xattrs. */
 212         ret = 0;
 213         off = 0;
 214         while (off + sizeof(struct EA_FULL) < size) {
 215                 const struct EA_FULL *ea = Add2Ptr(ea_all, off);
 216                 int ea_size = unpacked_ea_size(ea);
 217                 u8 name_len = ea->name_len;
 218
 219                 if (!name_len)
 220                         break;
 221
 222                 if (name_len > ea_size) {
 223                         ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_ERROR);
 224                         err = -EINVAL; /* corrupted fs. */
 225                         break;
 226                 }
 227
 228                 if (buffer) {
 229                         /* Check if we can use field ea->name */
 230                         if (off + ea_size > size)
 231                                 break;
 232
 233                         if (ret + name_len + 1 > bytes_per_buffer) {
 234                                 err = -ERANGE;
 235                                 goto out;
 236                         }
 237
 238                         memcpy(buffer + ret, ea->name, name_len);
 239                         buffer[ret + name_len] = 0;
 240                 }
 241
 242                 ret += name_len + 1;
 243                 off += ea_size;
 244         }
 245
 246 out:
 247         kfree(ea_all);
 248         return err ? err : ret;
 249 }
 250
 251 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
 252                        void *buffer, size_t size, size_t *required)
 253 {
 254         struct ntfs_inode *ni = ntfs_i(inode);
 255         const struct EA_INFO *info;
 256         struct EA_FULL *ea_all = NULL;
 257         const struct EA_FULL *ea;
 258         u32 off, len;
 259         int err;
 260
 261         if (!(ni->ni_flags & NI_FLAG_EA))
 262                 return -ENODATA;
 263
 264         if (!required)
 265                 ni_lock(ni);
 266
 267         len = 0;
 268
 269         if (name_len > 255) {
 270                 err = -ENAMETOOLONG;
 271                 goto out;
 272         }
 273
 274         err = ntfs_read_ea(ni, &ea_all, 0, &info);
 275         if (err)
 276                 goto out;
 277
 278         if (!info)
 279                 goto out;
 280
 281         /* Enumerate all xattrs. */
 282         if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off,
 283                      NULL)) {
 284                 err = -ENODATA;
 285                 goto out;
 286         }
 287         ea = Add2Ptr(ea_all, off);
 288
 289         len = le16_to_cpu(ea->elength);
 290         if (!buffer) {
 291                 err = 0;
 292                 goto out;
 293         }
 294
 295         if (len > size) {
 296                 err = -ERANGE;
 297                 if (required)
 298                         *required = len;
 299                 goto out;
 300         }
 301
 302         memcpy(buffer, ea->name + ea->name_len + 1, len);
 303         err = 0;
 304
 305 out:
 306         kfree(ea_all);
 307         if (!required)
 308                 ni_unlock(ni);
 309
 310         return err ? err : len;
 311 }
 312
 313 static noinline int ntfs_set_ea(struct inode *inode, const char *name,
 314                                 size_t name_len, const void *value,
 315                                 size_t val_size, int flags, bool locked,
 316                                 __le16 *ea_size)
 317 {
 318         struct ntfs_inode *ni = ntfs_i(inode);
 319         struct ntfs_sb_info *sbi = ni->mi.sbi;
 320         int err;
 321         struct EA_INFO ea_info;
 322         const struct EA_INFO *info;
 323         struct EA_FULL *new_ea;
 324         struct EA_FULL *ea_all = NULL;
 325         size_t add, new_pack;
 326         u32 off, size, ea_sz;
 327         __le16 size_pack;
 328         struct ATTRIB *attr;
 329         struct ATTR_LIST_ENTRY *le;
 330         struct mft_inode *mi;
 331         struct runs_tree ea_run;
 332         u64 new_sz;
 333         void *p;
 334
 335         if (!locked)
 336                 ni_lock(ni);
 337
 338         run_init(&ea_run);
 339
 340         if (name_len > 255) {
 341                 err = -ENAMETOOLONG;
 342                 goto out;
 343         }
 344
 345         add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
 346
 347         err = ntfs_read_ea(ni, &ea_all, add, &info);
 348         if (err)
 349                 goto out;
 350
 351         if (!info) {
 352                 memset(&ea_info, 0, sizeof(ea_info));
 353                 size = 0;
 354                 size_pack = 0;
 355         } else {
 356                 memcpy(&ea_info, info, sizeof(ea_info));
 357                 size = le32_to_cpu(ea_info.size);
 358                 size_pack = ea_info.size_pack;
 359         }
 360
 361         if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) {
 362                 struct EA_FULL *ea;
 363
 364                 if (flags & XATTR_CREATE) {
 365                         err = -EEXIST;
 366                         goto out;
 367                 }
 368
 369                 ea = Add2Ptr(ea_all, off);
 370
 371                 /*
 372                  * Check simple case when we try to insert xattr with the same value
 373                  * e.g. ntfs_save_wsl_perm
 374                  */
 375                 if (val_size && le16_to_cpu(ea->elength) == val_size &&
 376                     !memcmp(ea->name + ea->name_len + 1, value, val_size)) {
 377                         /* xattr already contains the required value. */
 378                         goto out;
 379                 }
 380
 381                 /* Remove current xattr. */
 382                 if (ea->flags & FILE_NEED_EA)
 383                         le16_add_cpu(&ea_info.count, -1);
 384
 385                 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
 386
 387                 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
 388
 389                 size -= ea_sz;
 390                 memset(Add2Ptr(ea_all, size), 0, ea_sz);
 391
 392                 ea_info.size = cpu_to_le32(size);
 393
 394                 if ((flags & XATTR_REPLACE) && !val_size) {
 395                         /* Remove xattr. */
 396                         goto update_ea;
 397                 }
 398         } else {
 399                 if (flags & XATTR_REPLACE) {
 400                         err = -ENODATA;
 401                         goto out;
 402                 }
 403
 404                 if (!ea_all) {
 405                         ea_all = kzalloc(add, GFP_NOFS);
 406                         if (!ea_all) {
 407                                 err = -ENOMEM;
 408                                 goto out;
 409                         }
 410                 }
 411         }
 412
 413         /* Append new xattr. */
 414         new_ea = Add2Ptr(ea_all, size);
 415         new_ea->size = cpu_to_le32(add);
 416         new_ea->flags = 0;
 417         new_ea->name_len = name_len;
 418         new_ea->elength = cpu_to_le16(val_size);
 419         memcpy(new_ea->name, name, name_len);
 420         new_ea->name[name_len] = 0;
 421         memcpy(new_ea->name + name_len + 1, value, val_size);
 422         new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
 423         ea_info.size_pack = cpu_to_le16(new_pack);
 424         /* New size of ATTR_EA. */
 425         size += add;
 426         ea_info.size = cpu_to_le32(size);
 427
 428         /*
 429          * 1. Check ea_info.size_pack for overflow.
 430          * 2. New attribute size must fit value from $AttrDef
 431          */
 432         if (new_pack > 0xffff || size > sbi->ea_max_size) {
 433                 ntfs_inode_warn(
 434                         inode,
 435                         "The size of extended attributes must not exceed 64KiB");
 436                 err = -EFBIG; // -EINVAL?
 437                 goto out;
 438         }
 439
 440 update_ea:
 441
 442         if (!info) {
 443                 /* Create xattr. */
 444                 if (!size) {
 445                         err = 0;
 446                         goto out;
 447                 }
 448
 449                 err = ni_insert_resident(ni, sizeof(struct EA_INFO),
 450                                          ATTR_EA_INFO, NULL, 0, NULL, NULL,
 451                                          NULL);
 452                 if (err)
 453                         goto out;
 454
 455                 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL,
 456                                          NULL);
 457                 if (err)
 458                         goto out;
 459         }
 460
 461         new_sz = size;
 462         err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
 463                             false, NULL);
 464         if (err)
 465                 goto out;
 466
 467         le = NULL;
 468         attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
 469         if (!attr) {
 470                 err = -EINVAL;
 471                 goto out;
 472         }
 473
 474         if (!size) {
 475                 /* Delete xattr, ATTR_EA_INFO */
 476                 ni_remove_attr_le(ni, attr, mi, le);
 477         } else {
 478                 p = resident_data_ex(attr, sizeof(struct EA_INFO));
 479                 if (!p) {
 480                         err = -EINVAL;
 481                         goto out;
 482                 }
 483                 memcpy(p, &ea_info, sizeof(struct EA_INFO));
 484                 mi->dirty = true;
 485         }
 486
 487         le = NULL;
 488         attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
 489         if (!attr) {
 490                 err = -EINVAL;
 491                 goto out;
 492         }
 493
 494         if (!size) {
 495                 /* Delete xattr, ATTR_EA */
 496                 ni_remove_attr_le(ni, attr, mi, le);
 497         } else if (attr->non_res) {
 498                 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0,
 499                                            size);
 500                 if (err)
 501                         goto out;
 502
 503                 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0);
 504                 if (err)
 505                         goto out;
 506         } else {
 507                 p = resident_data_ex(attr, size);
 508                 if (!p) {
 509                         err = -EINVAL;
 510                         goto out;
 511                 }
 512                 memcpy(p, ea_all, size);
 513                 mi->dirty = true;
 514         }
 515
 516         /* Check if we delete the last xattr. */
 517         if (size)
 518                 ni->ni_flags |= NI_FLAG_EA;
 519         else
 520                 ni->ni_flags &= ~NI_FLAG_EA;
 521
 522         if (ea_info.size_pack != size_pack)
 523                 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
 524         if (ea_size)
 525                 *ea_size = ea_info.size_pack;
 526         mark_inode_dirty(&ni->vfs_inode);
 527
 528 out:
 529         if (!locked)
 530                 ni_unlock(ni);
 531
 532         run_close(&ea_run);
 533         kfree(ea_all);
 534
 535         return err;
 536 }
 537
 538 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
 539
 540 /*
 541  * ntfs_get_acl - inode_operations::get_acl
 542  */
 543 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 544                                int type)
 545 {
 546         struct inode *inode = d_inode(dentry);
 547         struct ntfs_inode *ni = ntfs_i(inode);
 548         const char *name;
 549         size_t name_len;
 550         struct posix_acl *acl;
 551         size_t req;
 552         int err;
 553         void *buf;
 554
 555         /* Allocate PATH_MAX bytes. */
 556         buf = __getname();
 557         if (!buf)
 558                 return ERR_PTR(-ENOMEM);
 559
 560         /* Possible values of 'type' was already checked above. */
 561         if (type == ACL_TYPE_ACCESS) {
 562                 name = XATTR_NAME_POSIX_ACL_ACCESS;
 563                 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
 564         } else {
 565                 name = XATTR_NAME_POSIX_ACL_DEFAULT;
 566                 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
 567         }
 568
 569         ni_lock(ni);
 570
 571         err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
 572
 573         ni_unlock(ni);
 574
 575         /* Translate extended attribute to acl. */
 576         if (err >= 0) {
 577                 acl = posix_acl_from_xattr(&init_user_ns, buf, err);
 578         } else if (err == -ENODATA) {
 579                 acl = NULL;
 580         } else {
 581                 acl = ERR_PTR(err);
 582         }
 583
 584         if (!IS_ERR(acl))
 585                 set_cached_acl(inode, type, acl);
 586
 587         __putname(buf);
 588
 589         return acl;
 590 }
 591
 592 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap,
 593                                     struct inode *inode, struct posix_acl *acl,
 594                                     int type, bool init_acl)
 595 {
 596         const char *name;
 597         size_t size, name_len;
 598         void *value;
 599         int err;
 600         int flags;
 601         umode_t mode;
 602
 603         if (S_ISLNK(inode->i_mode))
 604                 return -EOPNOTSUPP;
 605
 606         mode = inode->i_mode;
 607         switch (type) {
 608         case ACL_TYPE_ACCESS:
 609                 /* Do not change i_mode if we are in init_acl */
 610                 if (acl && !init_acl) {
 611                         err = posix_acl_update_mode(idmap, inode, &mode, &acl);
 612                         if (err)
 613                                 return err;
 614                 }
 615                 name = XATTR_NAME_POSIX_ACL_ACCESS;
 616                 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
 617                 break;
 618
 619         case ACL_TYPE_DEFAULT:
 620                 if (!S_ISDIR(inode->i_mode))
 621                         return acl ? -EACCES : 0;
 622                 name = XATTR_NAME_POSIX_ACL_DEFAULT;
 623                 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
 624                 break;
 625
 626         default:
 627                 return -EINVAL;
 628         }
 629
 630         if (!acl) {
 631                 /* Remove xattr if it can be presented via mode. */
 632                 size = 0;
 633                 value = NULL;
 634                 flags = XATTR_REPLACE;
 635         } else {
 636                 size = posix_acl_xattr_size(acl->a_count);
 637                 value = kmalloc(size, GFP_NOFS);
 638                 if (!value)
 639                         return -ENOMEM;
 640                 err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
 641                 if (err < 0)
 642                         goto out;
 643                 flags = 0;
 644         }
 645
 646         err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL);
 647         if (err == -ENODATA && !size)
 648                 err = 0; /* Removing non existed xattr. */
 649         if (!err) {
 650                 set_cached_acl(inode, type, acl);
 651                 inode->i_mode = mode;
 652                 inode_set_ctime_current(inode);
 653                 mark_inode_dirty(inode);
 654         }
 655
 656 out:
 657         kfree(value);
 658
 659         return err;
 660 }
 661
 662 /*
 663  * ntfs_set_acl - inode_operations::set_acl
 664  */
 665 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 666                  struct posix_acl *acl, int type)
 667 {
 668         return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false);
 669 }
 670
 671 /*
 672  * ntfs_init_acl - Initialize the ACLs of a new inode.
 673  *
 674  * Called from ntfs_create_inode().
 675  */
 676 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode,
 677                   struct inode *dir)
 678 {
 679         struct posix_acl *default_acl, *acl;
 680         int err;
 681
 682         err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
 683         if (err)
 684                 return err;
 685
 686         if (default_acl) {
 687                 err = ntfs_set_acl_ex(idmap, inode, default_acl,
 688                                       ACL_TYPE_DEFAULT, true);
 689                 posix_acl_release(default_acl);
 690         } else {
 691                 inode->i_default_acl = NULL;
 692         }
 693
 694         if (acl) {
 695                 if (!err)
 696                         err = ntfs_set_acl_ex(idmap, inode, acl,
 697                                               ACL_TYPE_ACCESS, true);
 698                 posix_acl_release(acl);
 699         } else {
 700                 inode->i_acl = NULL;
 701         }
 702
 703         return err;
 704 }
 705 #endif
 706
 707 /*
 708  * ntfs_acl_chmod - Helper for ntfs_setattr().
 709  */
 710 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry)
 711 {
 712         struct inode *inode = d_inode(dentry);
 713         struct super_block *sb = inode->i_sb;
 714
 715         if (!(sb->s_flags & SB_POSIXACL))
 716                 return 0;
 717
 718         if (S_ISLNK(inode->i_mode))
 719                 return -EOPNOTSUPP;
 720
 721         return posix_acl_chmod(idmap, dentry, inode->i_mode);
 722 }
 723
 724 /*
 725  * ntfs_listxattr - inode_operations::listxattr
 726  */
 727 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 728 {
 729         struct inode *inode = d_inode(dentry);
 730         struct ntfs_inode *ni = ntfs_i(inode);
 731         ssize_t ret;
 732
 733         if (!(ni->ni_flags & NI_FLAG_EA)) {
 734                 /* no xattr in file */
 735                 return 0;
 736         }
 737
 738         ni_lock(ni);
 739
 740         ret = ntfs_list_ea(ni, buffer, size);
 741
 742         ni_unlock(ni);
 743
 744         return ret;
 745 }
 746
 747 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
 748                          struct inode *inode, const char *name, void *buffer,
 749                          size_t size)
 750 {
 751         int err;
 752         struct ntfs_inode *ni = ntfs_i(inode);
 753
 754         if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
 755                 return -EIO;
 756
 757         /* Dispatch request. */
 758         if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
 759                 /* system.dos_attrib */
 760                 if (!buffer) {
 761                         err = sizeof(u8);
 762                 } else if (size < sizeof(u8)) {
 763                         err = -ENODATA;
 764                 } else {
 765                         err = sizeof(u8);
 766                         *(u8 *)buffer = le32_to_cpu(ni->std_fa);
 767                 }
 768                 goto out;
 769         }
 770
 771         if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
 772             !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
 773                 /* system.ntfs_attrib */
 774                 if (!buffer) {
 775                         err = sizeof(u32);
 776                 } else if (size < sizeof(u32)) {
 777                         err = -ENODATA;
 778                 } else {
 779                         err = sizeof(u32);
 780                         *(u32 *)buffer = le32_to_cpu(ni->std_fa);
 781                         if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
 782                                 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer);
 783                 }
 784                 goto out;
 785         }
 786
 787         if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
 788                 /* system.ntfs_security*/
 789                 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
 790                 size_t sd_size = 0;
 791
 792                 if (!is_ntfs3(ni->mi.sbi)) {
 793                         /* We should get nt4 security. */
 794                         err = -EINVAL;
 795                         goto out;
 796                 } else if (le32_to_cpu(ni->std_security_id) <
 797                            SECURITY_ID_FIRST) {
 798                         err = -ENOENT;
 799                         goto out;
 800                 }
 801
 802                 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
 803                                               &sd, &sd_size);
 804                 if (err)
 805                         goto out;
 806
 807                 if (!is_sd_valid(sd, sd_size)) {
 808                         ntfs_inode_warn(
 809                                 inode,
 810                                 "looks like you get incorrect security descriptor id=%u",
 811                                 ni->std_security_id);
 812                 }
 813
 814                 if (!buffer) {
 815                         err = sd_size;
 816                 } else if (size < sd_size) {
 817                         err = -ENODATA;
 818                 } else {
 819                         err = sd_size;
 820                         memcpy(buffer, sd, sd_size);
 821                 }
 822                 kfree(sd);
 823                 goto out;
 824         }
 825
 826         /* Deal with NTFS extended attribute. */
 827         err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL);
 828
 829 out:
 830         return err;
 831 }
 832
 833 /*
 834  * ntfs_setxattr - inode_operations::setxattr
 835  */
 836 static noinline int ntfs_setxattr(const struct xattr_handler *handler,
 837                                   struct mnt_idmap *idmap, struct dentry *de,
 838                                   struct inode *inode, const char *name,
 839                                   const void *value, size_t size, int flags)
 840 {
 841         int err = -EINVAL;
 842         struct ntfs_inode *ni = ntfs_i(inode);
 843         enum FILE_ATTRIBUTE new_fa;
 844
 845         /* Dispatch request. */
 846         if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
 847                 if (sizeof(u8) != size)
 848                         goto out;
 849                 new_fa = cpu_to_le32(*(u8 *)value);
 850                 goto set_new_fa;
 851         }
 852
 853         if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
 854             !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
 855                 if (size != sizeof(u32))
 856                         goto out;
 857                 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
 858                         new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value));
 859                 else
 860                         new_fa = cpu_to_le32(*(u32 *)value);
 861
 862                 if (S_ISREG(inode->i_mode)) {
 863                         /* Process compressed/sparsed in special way. */
 864                         ni_lock(ni);
 865                         err = ni_new_attr_flags(ni, new_fa);
 866                         ni_unlock(ni);
 867                         if (err)
 868                                 goto out;
 869                 }
 870 set_new_fa:
 871                 /*
 872                  * Thanks Mark Harmstone:
 873                  * Keep directory bit consistency.
 874                  */
 875                 if (S_ISDIR(inode->i_mode))
 876                         new_fa |= FILE_ATTRIBUTE_DIRECTORY;
 877                 else
 878                         new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
 879
 880                 if (ni->std_fa != new_fa) {
 881                         ni->std_fa = new_fa;
 882                         if (new_fa & FILE_ATTRIBUTE_READONLY)
 883                                 inode->i_mode &= ~0222;
 884                         else
 885                                 inode->i_mode |= 0222;
 886                         /* Std attribute always in primary record. */
 887                         ni->mi.dirty = true;
 888                         mark_inode_dirty(inode);
 889                 }
 890                 err = 0;
 891
 892                 goto out;
 893         }
 894
 895         if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
 896                 /* system.ntfs_security*/
 897                 __le32 security_id;
 898                 bool inserted;
 899                 struct ATTR_STD_INFO5 *std;
 900
 901                 if (!is_ntfs3(ni->mi.sbi)) {
 902                         /*
 903                          * We should replace ATTR_SECURE.
 904                          * Skip this way cause it is nt4 feature.
 905                          */
 906                         err = -EINVAL;
 907                         goto out;
 908                 }
 909
 910                 if (!is_sd_valid(value, size)) {
 911                         err = -EINVAL;
 912                         ntfs_inode_warn(
 913                                 inode,
 914                                 "you try to set invalid security descriptor");
 915                         goto out;
 916                 }
 917
 918                 err = ntfs_insert_security(ni->mi.sbi, value, size,
 919                                            &security_id, &inserted);
 920                 if (err)
 921                         goto out;
 922
 923                 ni_lock(ni);
 924                 std = ni_std5(ni);
 925                 if (!std) {
 926                         err = -EINVAL;
 927                 } else if (std->security_id != security_id) {
 928                         std->security_id = ni->std_security_id = security_id;
 929                         /* Std attribute always in primary record. */
 930                         ni->mi.dirty = true;
 931                         mark_inode_dirty(&ni->vfs_inode);
 932                 }
 933                 ni_unlock(ni);
 934                 goto out;
 935         }
 936
 937         /* Deal with NTFS extended attribute. */
 938         err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0,
 939                           NULL);
 940
 941 out:
 942         inode_set_ctime_current(inode);
 943         mark_inode_dirty(inode);
 944
 945         return err;
 946 }
 947
 948 /*
 949  * ntfs_save_wsl_perm
 950  *
 951  * save uid/gid/mode in xattr
 952  */
 953 int ntfs_save_wsl_perm(struct inode *inode, __le16 *ea_size)
 954 {
 955         int err;
 956         __le32 value;
 957         struct ntfs_inode *ni = ntfs_i(inode);
 958
 959         ni_lock(ni);
 960         value = cpu_to_le32(i_uid_read(inode));
 961         err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
 962                           sizeof(value), 0, true, ea_size);
 963         if (err)
 964                 goto out;
 965
 966         value = cpu_to_le32(i_gid_read(inode));
 967         err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
 968                           sizeof(value), 0, true, ea_size);
 969         if (err)
 970                 goto out;
 971
 972         value = cpu_to_le32(inode->i_mode);
 973         err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
 974                           sizeof(value), 0, true, ea_size);
 975         if (err)
 976                 goto out;
 977
 978         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 979                 value = cpu_to_le32(inode->i_rdev);
 980                 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
 981                                   sizeof(value), 0, true, ea_size);
 982                 if (err)
 983                         goto out;
 984         }
 985
 986 out:
 987         ni_unlock(ni);
 988         /* In case of error should we delete all WSL xattr? */
 989         return err;
 990 }
 991
 992 /*
 993  * ntfs_get_wsl_perm
 994  *
 995  * get uid/gid/mode from xattr
 996  * it is called from ntfs_iget5->ntfs_read_mft
 997  */
 998 void ntfs_get_wsl_perm(struct inode *inode)
 999 {
1000         size_t sz;
1001         __le32 value[3];
1002
1003         if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
1004                         sizeof(value[0]), &sz) == sizeof(value[0]) &&
1005             ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
1006                         sizeof(value[1]), &sz) == sizeof(value[1]) &&
1007             ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
1008                         sizeof(value[2]), &sz) == sizeof(value[2])) {
1009                 i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
1010                 i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
1011                 inode->i_mode = le32_to_cpu(value[2]);
1012
1013                 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
1014                                 &value[0], sizeof(value),
1015                                 &sz) == sizeof(value[0])) {
1016                         inode->i_rdev = le32_to_cpu(value[0]);
1017                 }
1018         }
1019 }
1020
1021 static bool ntfs_xattr_user_list(struct dentry *dentry)
1022 {
1023         return true;
1024 }
1025
1026 // clang-format off
1027 static const struct xattr_handler ntfs_other_xattr_handler = {
1028         .prefix = "",
1029         .get    = ntfs_getxattr,
1030         .set    = ntfs_setxattr,
1031         .list   = ntfs_xattr_user_list,
1032 };
1033
1034 const struct xattr_handler * const ntfs_xattr_handlers[] = {
1035         &ntfs_other_xattr_handler,
1036         NULL,
1037 };
1038 // clang-format on