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
unpacked_ea_size(const struct EA_FULL * ea)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
packed_ea_size(const struct EA_FULL * ea)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 */
find_ea(const struct EA_FULL * ea_all,u32 bytes,const char * name,u8 name_len,u32 * off,u32 * ea_sz)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 */
ntfs_read_ea(struct ntfs_inode * ni,struct EA_FULL ** ea,size_t add_bytes,const struct EA_INFO ** info)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 */
ntfs_list_ea(struct ntfs_inode * ni,char * buffer,size_t bytes_per_buffer)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 const struct EA_FULL *ea;
199 u32 off, size;
200 int err;
201 int ea_size;
202 size_t ret;
203
204 err = ntfs_read_ea(ni, &ea_all, 0, &info);
205 if (err)
206 return err;
207
208 if (!info || !ea_all)
209 return 0;
210
211 size = le32_to_cpu(info->size);
212
213 /* Enumerate all xattrs. */
214 ret = 0;
215 for (off = 0; off + sizeof(struct EA_FULL) < size; off += ea_size) {
216 ea = Add2Ptr(ea_all, off);
217 ea_size = unpacked_ea_size(ea);
218
219 if (!ea->name_len)
220 break;
221
222 if (buffer) {
223 /* Check if we can use field ea->name */
224 if (off + ea_size > size)
225 break;
226
227 if (ret + ea->name_len + 1 > bytes_per_buffer) {
228 err = -ERANGE;
229 goto out;
230 }
231
232 memcpy(buffer + ret, ea->name, ea->name_len);
233 buffer[ret + ea->name_len] = 0;
234 }
235
236 ret += ea->name_len + 1;
237 }
238
239 out:
240 kfree(ea_all);
241 return err ? err : ret;
242 }
243
ntfs_get_ea(struct inode * inode,const char * name,size_t name_len,void * buffer,size_t size,size_t * required)244 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
245 void *buffer, size_t size, size_t *required)
246 {
247 struct ntfs_inode *ni = ntfs_i(inode);
248 const struct EA_INFO *info;
249 struct EA_FULL *ea_all = NULL;
250 const struct EA_FULL *ea;
251 u32 off, len;
252 int err;
253
254 if (!(ni->ni_flags & NI_FLAG_EA))
255 return -ENODATA;
256
257 if (!required)
258 ni_lock(ni);
259
260 len = 0;
261
262 if (name_len > 255) {
263 err = -ENAMETOOLONG;
264 goto out;
265 }
266
267 err = ntfs_read_ea(ni, &ea_all, 0, &info);
268 if (err)
269 goto out;
270
271 if (!info)
272 goto out;
273
274 /* Enumerate all xattrs. */
275 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off,
276 NULL)) {
277 err = -ENODATA;
278 goto out;
279 }
280 ea = Add2Ptr(ea_all, off);
281
282 len = le16_to_cpu(ea->elength);
283 if (!buffer) {
284 err = 0;
285 goto out;
286 }
287
288 if (len > size) {
289 err = -ERANGE;
290 if (required)
291 *required = len;
292 goto out;
293 }
294
295 memcpy(buffer, ea->name + ea->name_len + 1, len);
296 err = 0;
297
298 out:
299 kfree(ea_all);
300 if (!required)
301 ni_unlock(ni);
302
303 return err ? err : len;
304 }
305
ntfs_set_ea(struct inode * inode,const char * name,size_t name_len,const void * value,size_t val_size,int flags,bool locked,__le16 * ea_size)306 static noinline int ntfs_set_ea(struct inode *inode, const char *name,
307 size_t name_len, const void *value,
308 size_t val_size, int flags, bool locked,
309 __le16 *ea_size)
310 {
311 struct ntfs_inode *ni = ntfs_i(inode);
312 struct ntfs_sb_info *sbi = ni->mi.sbi;
313 int err;
314 struct EA_INFO ea_info;
315 const struct EA_INFO *info;
316 struct EA_FULL *new_ea;
317 struct EA_FULL *ea_all = NULL;
318 size_t add, new_pack;
319 u32 off, size, ea_sz;
320 __le16 size_pack;
321 struct ATTRIB *attr;
322 struct ATTR_LIST_ENTRY *le;
323 struct mft_inode *mi;
324 struct runs_tree ea_run;
325 u64 new_sz;
326 void *p;
327
328 if (!locked)
329 ni_lock(ni);
330
331 run_init(&ea_run);
332
333 if (name_len > 255) {
334 err = -ENAMETOOLONG;
335 goto out;
336 }
337
338 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
339
340 err = ntfs_read_ea(ni, &ea_all, add, &info);
341 if (err)
342 goto out;
343
344 if (!info) {
345 memset(&ea_info, 0, sizeof(ea_info));
346 size = 0;
347 size_pack = 0;
348 } else {
349 memcpy(&ea_info, info, sizeof(ea_info));
350 size = le32_to_cpu(ea_info.size);
351 size_pack = ea_info.size_pack;
352 }
353
354 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) {
355 struct EA_FULL *ea;
356
357 if (flags & XATTR_CREATE) {
358 err = -EEXIST;
359 goto out;
360 }
361
362 ea = Add2Ptr(ea_all, off);
363
364 /*
365 * Check simple case when we try to insert xattr with the same value
366 * e.g. ntfs_save_wsl_perm
367 */
368 if (val_size && le16_to_cpu(ea->elength) == val_size &&
369 !memcmp(ea->name + ea->name_len + 1, value, val_size)) {
370 /* xattr already contains the required value. */
371 goto out;
372 }
373
374 /* Remove current xattr. */
375 if (ea->flags & FILE_NEED_EA)
376 le16_add_cpu(&ea_info.count, -1);
377
378 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
379
380 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
381
382 size -= ea_sz;
383 memset(Add2Ptr(ea_all, size), 0, ea_sz);
384
385 ea_info.size = cpu_to_le32(size);
386
387 if ((flags & XATTR_REPLACE) && !val_size) {
388 /* Remove xattr. */
389 goto update_ea;
390 }
391 } else {
392 if (flags & XATTR_REPLACE) {
393 err = -ENODATA;
394 goto out;
395 }
396
397 if (!ea_all) {
398 ea_all = kzalloc(add, GFP_NOFS);
399 if (!ea_all) {
400 err = -ENOMEM;
401 goto out;
402 }
403 }
404 }
405
406 /* Append new xattr. */
407 new_ea = Add2Ptr(ea_all, size);
408 new_ea->size = cpu_to_le32(add);
409 new_ea->flags = 0;
410 new_ea->name_len = name_len;
411 new_ea->elength = cpu_to_le16(val_size);
412 memcpy(new_ea->name, name, name_len);
413 new_ea->name[name_len] = 0;
414 memcpy(new_ea->name + name_len + 1, value, val_size);
415 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
416 ea_info.size_pack = cpu_to_le16(new_pack);
417 /* New size of ATTR_EA. */
418 size += add;
419 ea_info.size = cpu_to_le32(size);
420
421 /*
422 * 1. Check ea_info.size_pack for overflow.
423 * 2. New attribute size must fit value from $AttrDef
424 */
425 if (new_pack > 0xffff || size > sbi->ea_max_size) {
426 ntfs_inode_warn(
427 inode,
428 "The size of extended attributes must not exceed 64KiB");
429 err = -EFBIG; // -EINVAL?
430 goto out;
431 }
432
433 update_ea:
434
435 if (!info) {
436 /* Create xattr. */
437 if (!size) {
438 err = 0;
439 goto out;
440 }
441
442 err = ni_insert_resident(ni, sizeof(struct EA_INFO),
443 ATTR_EA_INFO, NULL, 0, NULL, NULL,
444 NULL);
445 if (err)
446 goto out;
447
448 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL,
449 NULL);
450 if (err)
451 goto out;
452 }
453
454 new_sz = size;
455 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
456 false, NULL);
457 if (err)
458 goto out;
459
460 le = NULL;
461 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
462 if (!attr) {
463 err = -EINVAL;
464 goto out;
465 }
466
467 if (!size) {
468 /* Delete xattr, ATTR_EA_INFO */
469 ni_remove_attr_le(ni, attr, mi, le);
470 } else {
471 p = resident_data_ex(attr, sizeof(struct EA_INFO));
472 if (!p) {
473 err = -EINVAL;
474 goto out;
475 }
476 memcpy(p, &ea_info, sizeof(struct EA_INFO));
477 mi->dirty = true;
478 }
479
480 le = NULL;
481 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
482 if (!attr) {
483 err = -EINVAL;
484 goto out;
485 }
486
487 if (!size) {
488 /* Delete xattr, ATTR_EA */
489 ni_remove_attr_le(ni, attr, mi, le);
490 } else if (attr->non_res) {
491 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0,
492 size);
493 if (err)
494 goto out;
495
496 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0);
497 if (err)
498 goto out;
499 } else {
500 p = resident_data_ex(attr, size);
501 if (!p) {
502 err = -EINVAL;
503 goto out;
504 }
505 memcpy(p, ea_all, size);
506 mi->dirty = true;
507 }
508
509 /* Check if we delete the last xattr. */
510 if (size)
511 ni->ni_flags |= NI_FLAG_EA;
512 else
513 ni->ni_flags &= ~NI_FLAG_EA;
514
515 if (ea_info.size_pack != size_pack)
516 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
517 if (ea_size)
518 *ea_size = ea_info.size_pack;
519 mark_inode_dirty(&ni->vfs_inode);
520
521 out:
522 if (!locked)
523 ni_unlock(ni);
524
525 run_close(&ea_run);
526 kfree(ea_all);
527
528 return err;
529 }
530
531 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
532
533 /*
534 * ntfs_get_acl - inode_operations::get_acl
535 */
ntfs_get_acl(struct mnt_idmap * idmap,struct dentry * dentry,int type)536 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
537 int type)
538 {
539 struct inode *inode = d_inode(dentry);
540 struct ntfs_inode *ni = ntfs_i(inode);
541 const char *name;
542 size_t name_len;
543 struct posix_acl *acl;
544 size_t req;
545 int err;
546 void *buf;
547
548 /* Allocate PATH_MAX bytes. */
549 buf = __getname();
550 if (!buf)
551 return ERR_PTR(-ENOMEM);
552
553 /* Possible values of 'type' was already checked above. */
554 if (type == ACL_TYPE_ACCESS) {
555 name = XATTR_NAME_POSIX_ACL_ACCESS;
556 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
557 } else {
558 name = XATTR_NAME_POSIX_ACL_DEFAULT;
559 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
560 }
561
562 ni_lock(ni);
563
564 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
565
566 ni_unlock(ni);
567
568 /* Translate extended attribute to acl. */
569 if (err >= 0) {
570 acl = posix_acl_from_xattr(&init_user_ns, buf, err);
571 } else if (err == -ENODATA) {
572 acl = NULL;
573 } else {
574 acl = ERR_PTR(err);
575 }
576
577 if (!IS_ERR(acl))
578 set_cached_acl(inode, type, acl);
579
580 __putname(buf);
581
582 return acl;
583 }
584
ntfs_set_acl_ex(struct mnt_idmap * idmap,struct inode * inode,struct posix_acl * acl,int type,bool init_acl)585 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap,
586 struct inode *inode, struct posix_acl *acl,
587 int type, bool init_acl)
588 {
589 const char *name;
590 size_t size, name_len;
591 void *value;
592 int err;
593 int flags;
594 umode_t mode;
595
596 if (S_ISLNK(inode->i_mode))
597 return -EOPNOTSUPP;
598
599 mode = inode->i_mode;
600 switch (type) {
601 case ACL_TYPE_ACCESS:
602 /* Do not change i_mode if we are in init_acl */
603 if (acl && !init_acl) {
604 err = posix_acl_update_mode(idmap, inode, &mode, &acl);
605 if (err)
606 return err;
607 }
608 name = XATTR_NAME_POSIX_ACL_ACCESS;
609 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
610 break;
611
612 case ACL_TYPE_DEFAULT:
613 if (!S_ISDIR(inode->i_mode))
614 return acl ? -EACCES : 0;
615 name = XATTR_NAME_POSIX_ACL_DEFAULT;
616 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
617 break;
618
619 default:
620 return -EINVAL;
621 }
622
623 if (!acl) {
624 /* Remove xattr if it can be presented via mode. */
625 size = 0;
626 value = NULL;
627 flags = XATTR_REPLACE;
628 } else {
629 size = posix_acl_xattr_size(acl->a_count);
630 value = kmalloc(size, GFP_NOFS);
631 if (!value)
632 return -ENOMEM;
633 err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
634 if (err < 0)
635 goto out;
636 flags = 0;
637 }
638
639 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL);
640 if (err == -ENODATA && !size)
641 err = 0; /* Removing non existed xattr. */
642 if (!err) {
643 set_cached_acl(inode, type, acl);
644 inode->i_mode = mode;
645 inode_set_ctime_current(inode);
646 mark_inode_dirty(inode);
647 }
648
649 out:
650 kfree(value);
651
652 return err;
653 }
654
655 /*
656 * ntfs_set_acl - inode_operations::set_acl
657 */
ntfs_set_acl(struct mnt_idmap * idmap,struct dentry * dentry,struct posix_acl * acl,int type)658 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
659 struct posix_acl *acl, int type)
660 {
661 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false);
662 }
663
664 /*
665 * ntfs_init_acl - Initialize the ACLs of a new inode.
666 *
667 * Called from ntfs_create_inode().
668 */
ntfs_init_acl(struct mnt_idmap * idmap,struct inode * inode,struct inode * dir)669 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode,
670 struct inode *dir)
671 {
672 struct posix_acl *default_acl, *acl;
673 int err;
674
675 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
676 if (err)
677 return err;
678
679 if (default_acl) {
680 err = ntfs_set_acl_ex(idmap, inode, default_acl,
681 ACL_TYPE_DEFAULT, true);
682 posix_acl_release(default_acl);
683 } else {
684 inode->i_default_acl = NULL;
685 }
686
687 if (acl) {
688 if (!err)
689 err = ntfs_set_acl_ex(idmap, inode, acl,
690 ACL_TYPE_ACCESS, true);
691 posix_acl_release(acl);
692 } else {
693 inode->i_acl = NULL;
694 }
695
696 return err;
697 }
698 #endif
699
700 /*
701 * ntfs_acl_chmod - Helper for ntfs3_setattr().
702 */
ntfs_acl_chmod(struct mnt_idmap * idmap,struct dentry * dentry)703 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry)
704 {
705 struct inode *inode = d_inode(dentry);
706 struct super_block *sb = inode->i_sb;
707
708 if (!(sb->s_flags & SB_POSIXACL))
709 return 0;
710
711 if (S_ISLNK(inode->i_mode))
712 return -EOPNOTSUPP;
713
714 return posix_acl_chmod(idmap, dentry, inode->i_mode);
715 }
716
717 /*
718 * ntfs_listxattr - inode_operations::listxattr
719 */
ntfs_listxattr(struct dentry * dentry,char * buffer,size_t size)720 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
721 {
722 struct inode *inode = d_inode(dentry);
723 struct ntfs_inode *ni = ntfs_i(inode);
724 ssize_t ret;
725
726 if (!(ni->ni_flags & NI_FLAG_EA)) {
727 /* no xattr in file */
728 return 0;
729 }
730
731 ni_lock(ni);
732
733 ret = ntfs_list_ea(ni, buffer, size);
734
735 ni_unlock(ni);
736
737 return ret;
738 }
739
ntfs_getxattr(const struct xattr_handler * handler,struct dentry * de,struct inode * inode,const char * name,void * buffer,size_t size)740 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
741 struct inode *inode, const char *name, void *buffer,
742 size_t size)
743 {
744 int err;
745 struct ntfs_inode *ni = ntfs_i(inode);
746
747 /* Dispatch request. */
748 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
749 /* system.dos_attrib */
750 if (!buffer) {
751 err = sizeof(u8);
752 } else if (size < sizeof(u8)) {
753 err = -ENODATA;
754 } else {
755 err = sizeof(u8);
756 *(u8 *)buffer = le32_to_cpu(ni->std_fa);
757 }
758 goto out;
759 }
760
761 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
762 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
763 /* system.ntfs_attrib */
764 if (!buffer) {
765 err = sizeof(u32);
766 } else if (size < sizeof(u32)) {
767 err = -ENODATA;
768 } else {
769 err = sizeof(u32);
770 *(u32 *)buffer = le32_to_cpu(ni->std_fa);
771 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
772 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer);
773 }
774 goto out;
775 }
776
777 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
778 /* system.ntfs_security*/
779 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
780 size_t sd_size = 0;
781
782 if (!is_ntfs3(ni->mi.sbi)) {
783 /* We should get nt4 security. */
784 err = -EINVAL;
785 goto out;
786 } else if (le32_to_cpu(ni->std_security_id) <
787 SECURITY_ID_FIRST) {
788 err = -ENOENT;
789 goto out;
790 }
791
792 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
793 &sd, &sd_size);
794 if (err)
795 goto out;
796
797 if (!is_sd_valid(sd, sd_size)) {
798 ntfs_inode_warn(
799 inode,
800 "looks like you get incorrect security descriptor id=%u",
801 ni->std_security_id);
802 }
803
804 if (!buffer) {
805 err = sd_size;
806 } else if (size < sd_size) {
807 err = -ENODATA;
808 } else {
809 err = sd_size;
810 memcpy(buffer, sd, sd_size);
811 }
812 kfree(sd);
813 goto out;
814 }
815
816 /* Deal with NTFS extended attribute. */
817 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL);
818
819 out:
820 return err;
821 }
822
823 /*
824 * ntfs_setxattr - inode_operations::setxattr
825 */
ntfs_setxattr(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * de,struct inode * inode,const char * name,const void * value,size_t size,int flags)826 static noinline int ntfs_setxattr(const struct xattr_handler *handler,
827 struct mnt_idmap *idmap, struct dentry *de,
828 struct inode *inode, const char *name,
829 const void *value, size_t size, int flags)
830 {
831 int err = -EINVAL;
832 struct ntfs_inode *ni = ntfs_i(inode);
833 enum FILE_ATTRIBUTE new_fa;
834
835 /* Dispatch request. */
836 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
837 if (sizeof(u8) != size)
838 goto out;
839 new_fa = cpu_to_le32(*(u8 *)value);
840 goto set_new_fa;
841 }
842
843 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
844 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
845 if (size != sizeof(u32))
846 goto out;
847 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
848 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value));
849 else
850 new_fa = cpu_to_le32(*(u32 *)value);
851
852 if (S_ISREG(inode->i_mode)) {
853 /* Process compressed/sparsed in special way. */
854 ni_lock(ni);
855 err = ni_new_attr_flags(ni, new_fa);
856 ni_unlock(ni);
857 if (err)
858 goto out;
859 }
860 set_new_fa:
861 /*
862 * Thanks Mark Harmstone:
863 * Keep directory bit consistency.
864 */
865 if (S_ISDIR(inode->i_mode))
866 new_fa |= FILE_ATTRIBUTE_DIRECTORY;
867 else
868 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
869
870 if (ni->std_fa != new_fa) {
871 ni->std_fa = new_fa;
872 if (new_fa & FILE_ATTRIBUTE_READONLY)
873 inode->i_mode &= ~0222;
874 else
875 inode->i_mode |= 0222;
876 /* Std attribute always in primary record. */
877 ni->mi.dirty = true;
878 mark_inode_dirty(inode);
879 }
880 err = 0;
881
882 goto out;
883 }
884
885 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
886 /* system.ntfs_security*/
887 __le32 security_id;
888 bool inserted;
889 struct ATTR_STD_INFO5 *std;
890
891 if (!is_ntfs3(ni->mi.sbi)) {
892 /*
893 * We should replace ATTR_SECURE.
894 * Skip this way cause it is nt4 feature.
895 */
896 err = -EINVAL;
897 goto out;
898 }
899
900 if (!is_sd_valid(value, size)) {
901 err = -EINVAL;
902 ntfs_inode_warn(
903 inode,
904 "you try to set invalid security descriptor");
905 goto out;
906 }
907
908 err = ntfs_insert_security(ni->mi.sbi, value, size,
909 &security_id, &inserted);
910 if (err)
911 goto out;
912
913 ni_lock(ni);
914 std = ni_std5(ni);
915 if (!std) {
916 err = -EINVAL;
917 } else if (std->security_id != security_id) {
918 std->security_id = ni->std_security_id = security_id;
919 /* Std attribute always in primary record. */
920 ni->mi.dirty = true;
921 mark_inode_dirty(&ni->vfs_inode);
922 }
923 ni_unlock(ni);
924 goto out;
925 }
926
927 /* Deal with NTFS extended attribute. */
928 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0,
929 NULL);
930
931 out:
932 inode_set_ctime_current(inode);
933 mark_inode_dirty(inode);
934
935 return err;
936 }
937
938 /*
939 * ntfs_save_wsl_perm
940 *
941 * save uid/gid/mode in xattr
942 */
ntfs_save_wsl_perm(struct inode * inode,__le16 * ea_size)943 int ntfs_save_wsl_perm(struct inode *inode, __le16 *ea_size)
944 {
945 int err;
946 __le32 value;
947 struct ntfs_inode *ni = ntfs_i(inode);
948
949 ni_lock(ni);
950 value = cpu_to_le32(i_uid_read(inode));
951 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
952 sizeof(value), 0, true, ea_size);
953 if (err)
954 goto out;
955
956 value = cpu_to_le32(i_gid_read(inode));
957 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
958 sizeof(value), 0, true, ea_size);
959 if (err)
960 goto out;
961
962 value = cpu_to_le32(inode->i_mode);
963 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
964 sizeof(value), 0, true, ea_size);
965 if (err)
966 goto out;
967
968 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
969 value = cpu_to_le32(inode->i_rdev);
970 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
971 sizeof(value), 0, true, ea_size);
972 if (err)
973 goto out;
974 }
975
976 out:
977 ni_unlock(ni);
978 /* In case of error should we delete all WSL xattr? */
979 return err;
980 }
981
982 /*
983 * ntfs_get_wsl_perm
984 *
985 * get uid/gid/mode from xattr
986 * it is called from ntfs_iget5->ntfs_read_mft
987 */
ntfs_get_wsl_perm(struct inode * inode)988 void ntfs_get_wsl_perm(struct inode *inode)
989 {
990 size_t sz;
991 __le32 value[3];
992
993 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
994 sizeof(value[0]), &sz) == sizeof(value[0]) &&
995 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
996 sizeof(value[1]), &sz) == sizeof(value[1]) &&
997 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
998 sizeof(value[2]), &sz) == sizeof(value[2])) {
999 i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
1000 i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
1001 inode->i_mode = le32_to_cpu(value[2]);
1002
1003 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
1004 &value[0], sizeof(value),
1005 &sz) == sizeof(value[0])) {
1006 inode->i_rdev = le32_to_cpu(value[0]);
1007 }
1008 }
1009 }
1010
ntfs_xattr_user_list(struct dentry * dentry)1011 static bool ntfs_xattr_user_list(struct dentry *dentry)
1012 {
1013 return true;
1014 }
1015
1016 // clang-format off
1017 static const struct xattr_handler ntfs_other_xattr_handler = {
1018 .prefix = "",
1019 .get = ntfs_getxattr,
1020 .set = ntfs_setxattr,
1021 .list = ntfs_xattr_user_list,
1022 };
1023
1024 const struct xattr_handler *ntfs_xattr_handlers[] = {
1025 &ntfs_other_xattr_handler,
1026 NULL,
1027 };
1028 // clang-format on
1029
