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 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
ntfs_get_ea(struct inode * inode,const char * name,size_t name_len,void * buffer,size_t size,size_t * required)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
ntfs_set_ea(struct inode * inode,const char * name,size_t name_len,const void * value,size_t val_size,int flags,bool locked,__le32 * ea_size)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 __le32 *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;
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 */
ntfs_get_acl(struct mnt_idmap * idmap,struct dentry * dentry,int type)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 /* Avoid any operation if inode is bad. */
556 if (unlikely(is_bad_ni(ni)))
557 return ERR_PTR(-EINVAL);
558
559 /* Allocate PATH_MAX bytes. */
560 buf = __getname();
561 if (!buf)
562 return ERR_PTR(-ENOMEM);
563
564 /* Possible values of 'type' was already checked above. */
565 if (type == ACL_TYPE_ACCESS) {
566 name = XATTR_NAME_POSIX_ACL_ACCESS;
567 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
568 } else {
569 name = XATTR_NAME_POSIX_ACL_DEFAULT;
570 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
571 }
572
573 ni_lock(ni);
574
575 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
576
577 ni_unlock(ni);
578
579 /* Translate extended attribute to acl. */
580 if (err >= 0) {
581 acl = posix_acl_from_xattr(&init_user_ns, buf, err);
582 } else if (err == -ENODATA) {
583 acl = NULL;
584 } else {
585 acl = ERR_PTR(err);
586 }
587
588 if (!IS_ERR(acl))
589 set_cached_acl(inode, type, acl);
590
591 __putname(buf);
592
593 return acl;
594 }
595
ntfs_set_acl_ex(struct mnt_idmap * idmap,struct inode * inode,struct posix_acl * acl,int type,bool init_acl)596 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap,
597 struct inode *inode, struct posix_acl *acl,
598 int type, bool init_acl)
599 {
600 const char *name;
601 size_t size, name_len;
602 void *value;
603 int err;
604 int flags;
605 umode_t mode;
606
607 /* Avoid any operation if inode is bad. */
608 if (unlikely(is_bad_ni(ntfs_i(inode))))
609 return -EINVAL;
610
611 if (S_ISLNK(inode->i_mode))
612 return -EOPNOTSUPP;
613
614 mode = inode->i_mode;
615 switch (type) {
616 case ACL_TYPE_ACCESS:
617 /* Do not change i_mode if we are in init_acl */
618 if (acl && !init_acl) {
619 err = posix_acl_update_mode(idmap, inode, &mode, &acl);
620 if (err)
621 return err;
622 }
623 name = XATTR_NAME_POSIX_ACL_ACCESS;
624 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
625 break;
626
627 case ACL_TYPE_DEFAULT:
628 if (!S_ISDIR(inode->i_mode))
629 return acl ? -EACCES : 0;
630 name = XATTR_NAME_POSIX_ACL_DEFAULT;
631 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
632 break;
633
634 default:
635 return -EINVAL;
636 }
637
638 if (!acl) {
639 /* Remove xattr if it can be presented via mode. */
640 size = 0;
641 value = NULL;
642 flags = XATTR_REPLACE;
643 } else {
644 size = posix_acl_xattr_size(acl->a_count);
645 value = kmalloc(size, GFP_NOFS);
646 if (!value)
647 return -ENOMEM;
648 err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
649 if (err < 0)
650 goto out;
651 flags = 0;
652 }
653
654 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL);
655 if (err == -ENODATA && !size)
656 err = 0; /* Removing non existed xattr. */
657 if (!err) {
658 set_cached_acl(inode, type, acl);
659 inode->i_mode = mode;
660 inode_set_ctime_current(inode);
661 mark_inode_dirty(inode);
662 }
663
664 out:
665 kfree(value);
666
667 return err;
668 }
669
670 /*
671 * ntfs_set_acl - inode_operations::set_acl
672 */
ntfs_set_acl(struct mnt_idmap * idmap,struct dentry * dentry,struct posix_acl * acl,int type)673 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
674 struct posix_acl *acl, int type)
675 {
676 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false);
677 }
678
679 /*
680 * ntfs_init_acl - Initialize the ACLs of a new inode.
681 *
682 * Called from ntfs_create_inode().
683 */
ntfs_init_acl(struct mnt_idmap * idmap,struct inode * inode,struct inode * dir)684 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode,
685 struct inode *dir)
686 {
687 struct posix_acl *default_acl, *acl;
688 int err;
689
690 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
691 if (err)
692 return err;
693
694 if (default_acl) {
695 err = ntfs_set_acl_ex(idmap, inode, default_acl,
696 ACL_TYPE_DEFAULT, true);
697 posix_acl_release(default_acl);
698 } else {
699 inode->i_default_acl = NULL;
700 }
701
702 if (acl) {
703 if (!err)
704 err = ntfs_set_acl_ex(idmap, inode, acl,
705 ACL_TYPE_ACCESS, true);
706 posix_acl_release(acl);
707 } else {
708 inode->i_acl = NULL;
709 }
710
711 return err;
712 }
713 #endif
714
715 /*
716 * ntfs_acl_chmod - Helper for ntfs_setattr().
717 */
ntfs_acl_chmod(struct mnt_idmap * idmap,struct dentry * dentry)718 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry)
719 {
720 struct inode *inode = d_inode(dentry);
721 struct super_block *sb = inode->i_sb;
722
723 if (!(sb->s_flags & SB_POSIXACL))
724 return 0;
725
726 if (S_ISLNK(inode->i_mode))
727 return -EOPNOTSUPP;
728
729 return posix_acl_chmod(idmap, dentry, inode->i_mode);
730 }
731
732 /*
733 * ntfs_listxattr - inode_operations::listxattr
734 */
ntfs_listxattr(struct dentry * dentry,char * buffer,size_t size)735 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
736 {
737 struct inode *inode = d_inode(dentry);
738 struct ntfs_inode *ni = ntfs_i(inode);
739 ssize_t ret;
740
741 /* Avoid any operation if inode is bad. */
742 if (unlikely(is_bad_ni(ni)))
743 return -EINVAL;
744
745 if (!(ni->ni_flags & NI_FLAG_EA)) {
746 /* no xattr in file */
747 return 0;
748 }
749
750 ni_lock(ni);
751
752 ret = ntfs_list_ea(ni, buffer, size);
753
754 ni_unlock(ni);
755
756 return ret;
757 }
758
ntfs_getxattr(const struct xattr_handler * handler,struct dentry * de,struct inode * inode,const char * name,void * buffer,size_t size)759 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
760 struct inode *inode, const char *name, void *buffer,
761 size_t size)
762 {
763 int err;
764 struct ntfs_inode *ni = ntfs_i(inode);
765
766 /* Avoid any operation if inode is bad. */
767 if (unlikely(is_bad_ni(ni)))
768 return -EINVAL;
769
770 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
771 return -EIO;
772
773 /* Dispatch request. */
774 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
775 /* system.dos_attrib */
776 if (!buffer) {
777 err = sizeof(u8);
778 } else if (size < sizeof(u8)) {
779 err = -ENODATA;
780 } else {
781 err = sizeof(u8);
782 *(u8 *)buffer = le32_to_cpu(ni->std_fa);
783 }
784 goto out;
785 }
786
787 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
788 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
789 /* system.ntfs_attrib */
790 if (!buffer) {
791 err = sizeof(u32);
792 } else if (size < sizeof(u32)) {
793 err = -ENODATA;
794 } else {
795 err = sizeof(u32);
796 *(u32 *)buffer = le32_to_cpu(ni->std_fa);
797 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
798 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer);
799 }
800 goto out;
801 }
802
803 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
804 /* system.ntfs_security*/
805 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
806 size_t sd_size = 0;
807
808 if (!is_ntfs3(ni->mi.sbi)) {
809 /* We should get nt4 security. */
810 err = -EINVAL;
811 goto out;
812 } else if (le32_to_cpu(ni->std_security_id) <
813 SECURITY_ID_FIRST) {
814 err = -ENOENT;
815 goto out;
816 }
817
818 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
819 &sd, &sd_size);
820 if (err)
821 goto out;
822
823 if (!is_sd_valid(sd, sd_size)) {
824 ntfs_inode_warn(
825 inode,
826 "looks like you get incorrect security descriptor id=%u",
827 ni->std_security_id);
828 }
829
830 if (!buffer) {
831 err = sd_size;
832 } else if (size < sd_size) {
833 err = -ENODATA;
834 } else {
835 err = sd_size;
836 memcpy(buffer, sd, sd_size);
837 }
838 kfree(sd);
839 goto out;
840 }
841
842 /* Deal with NTFS extended attribute. */
843 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL);
844
845 out:
846 return err;
847 }
848
849 /*
850 * ntfs_setxattr - inode_operations::setxattr
851 */
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)852 static noinline int ntfs_setxattr(const struct xattr_handler *handler,
853 struct mnt_idmap *idmap, struct dentry *de,
854 struct inode *inode, const char *name,
855 const void *value, size_t size, int flags)
856 {
857 int err = -EINVAL;
858 struct ntfs_inode *ni = ntfs_i(inode);
859 enum FILE_ATTRIBUTE new_fa;
860
861 /* Dispatch request. */
862 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
863 if (sizeof(u8) != size)
864 goto out;
865 new_fa = cpu_to_le32(*(u8 *)value);
866 goto set_new_fa;
867 }
868
869 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
870 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
871 if (size != sizeof(u32))
872 goto out;
873 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
874 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value));
875 else
876 new_fa = cpu_to_le32(*(u32 *)value);
877
878 if (S_ISREG(inode->i_mode)) {
879 /* Process compressed/sparsed in special way. */
880 ni_lock(ni);
881 err = ni_new_attr_flags(ni, new_fa);
882 ni_unlock(ni);
883 if (err)
884 goto out;
885 }
886 set_new_fa:
887 /*
888 * Thanks Mark Harmstone:
889 * Keep directory bit consistency.
890 */
891 if (S_ISDIR(inode->i_mode))
892 new_fa |= FILE_ATTRIBUTE_DIRECTORY;
893 else
894 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
895
896 if (ni->std_fa != new_fa) {
897 ni->std_fa = new_fa;
898 if (new_fa & FILE_ATTRIBUTE_READONLY)
899 inode->i_mode &= ~0222;
900 else
901 inode->i_mode |= 0222;
902 /* Std attribute always in primary record. */
903 ni->mi.dirty = true;
904 mark_inode_dirty(inode);
905 }
906 err = 0;
907
908 goto out;
909 }
910
911 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
912 /* system.ntfs_security*/
913 __le32 security_id;
914 bool inserted;
915 struct ATTR_STD_INFO5 *std;
916
917 if (!is_ntfs3(ni->mi.sbi)) {
918 /*
919 * We should replace ATTR_SECURE.
920 * Skip this way cause it is nt4 feature.
921 */
922 err = -EINVAL;
923 goto out;
924 }
925
926 if (!is_sd_valid(value, size)) {
927 err = -EINVAL;
928 ntfs_inode_warn(
929 inode,
930 "you try to set invalid security descriptor");
931 goto out;
932 }
933
934 err = ntfs_insert_security(ni->mi.sbi, value, size,
935 &security_id, &inserted);
936 if (err)
937 goto out;
938
939 ni_lock(ni);
940 std = ni_std5(ni);
941 if (!std) {
942 err = -EINVAL;
943 } else if (std->security_id != security_id) {
944 std->security_id = ni->std_security_id = security_id;
945 /* Std attribute always in primary record. */
946 ni->mi.dirty = true;
947 mark_inode_dirty(&ni->vfs_inode);
948 }
949 ni_unlock(ni);
950 goto out;
951 }
952
953 /* Deal with NTFS extended attribute. */
954 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0,
955 NULL);
956
957 out:
958 inode_set_ctime_current(inode);
959 mark_inode_dirty(inode);
960
961 return err;
962 }
963
964 /*
965 * ntfs_save_wsl_perm
966 *
967 * save uid/gid/mode in xattr
968 */
ntfs_save_wsl_perm(struct inode * inode,__le32 * ea_size)969 int ntfs_save_wsl_perm(struct inode *inode, __le32 *ea_size)
970 {
971 int err;
972 __le32 value;
973 struct ntfs_inode *ni = ntfs_i(inode);
974
975 ni_lock(ni);
976 value = cpu_to_le32(i_uid_read(inode));
977 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
978 sizeof(value), 0, true, ea_size);
979 if (err)
980 goto out;
981
982 value = cpu_to_le32(i_gid_read(inode));
983 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
984 sizeof(value), 0, true, ea_size);
985 if (err)
986 goto out;
987
988 value = cpu_to_le32(inode->i_mode);
989 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
990 sizeof(value), 0, true, ea_size);
991 if (err)
992 goto out;
993
994 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
995 value = cpu_to_le32(inode->i_rdev);
996 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
997 sizeof(value), 0, true, ea_size);
998 if (err)
999 goto out;
1000 }
1001
1002 out:
1003 ni_unlock(ni);
1004 /* In case of error should we delete all WSL xattr? */
1005 return err;
1006 }
1007
1008 /*
1009 * ntfs_get_wsl_perm
1010 *
1011 * get uid/gid/mode from xattr
1012 * it is called from ntfs_iget5->ntfs_read_mft
1013 */
ntfs_get_wsl_perm(struct inode * inode)1014 void ntfs_get_wsl_perm(struct inode *inode)
1015 {
1016 size_t sz;
1017 __le32 value[3];
1018
1019 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
1020 sizeof(value[0]), &sz) == sizeof(value[0]) &&
1021 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
1022 sizeof(value[1]), &sz) == sizeof(value[1]) &&
1023 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
1024 sizeof(value[2]), &sz) == sizeof(value[2])) {
1025 i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
1026 i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
1027 inode->i_mode = le32_to_cpu(value[2]);
1028
1029 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
1030 &value[0], sizeof(value),
1031 &sz) == sizeof(value[0])) {
1032 inode->i_rdev = le32_to_cpu(value[0]);
1033 }
1034 }
1035 }
1036
ntfs_xattr_user_list(struct dentry * dentry)1037 static bool ntfs_xattr_user_list(struct dentry *dentry)
1038 {
1039 return true;
1040 }
1041
1042 // clang-format off
1043 static const struct xattr_handler ntfs_other_xattr_handler = {
1044 .prefix = "",
1045 .get = ntfs_getxattr,
1046 .set = ntfs_setxattr,
1047 .list = ntfs_xattr_user_list,
1048 };
1049
1050 const struct xattr_handler * const ntfs_xattr_handlers[] = {
1051 &ntfs_other_xattr_handler,
1052 NULL,
1053 };
1054 // clang-format on
1055