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 (ea->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 + ea->name_len + 1 > bytes_per_buffer) {
234 err = -ERANGE;
235 goto out;
236 }
237
238 memcpy(buffer + ret, ea->name, ea->name_len);
239 buffer[ret + ea->name_len] = 0;
240 }
241
242 ret += ea->name_len + 1;
243 }
244
245 out:
246 kfree(ea_all);
247 return err ? err : ret;
248 }
249
ntfs_get_ea(struct inode * inode,const char * name,size_t name_len,void * buffer,size_t size,size_t * required)250 static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
251 void *buffer, size_t size, size_t *required)
252 {
253 struct ntfs_inode *ni = ntfs_i(inode);
254 const struct EA_INFO *info;
255 struct EA_FULL *ea_all = NULL;
256 const struct EA_FULL *ea;
257 u32 off, len;
258 int err;
259
260 if (!(ni->ni_flags & NI_FLAG_EA))
261 return -ENODATA;
262
263 if (!required)
264 ni_lock(ni);
265
266 len = 0;
267
268 if (name_len > 255) {
269 err = -ENAMETOOLONG;
270 goto out;
271 }
272
273 err = ntfs_read_ea(ni, &ea_all, 0, &info);
274 if (err)
275 goto out;
276
277 if (!info)
278 goto out;
279
280 /* Enumerate all xattrs. */
281 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off,
282 NULL)) {
283 err = -ENODATA;
284 goto out;
285 }
286 ea = Add2Ptr(ea_all, off);
287
288 len = le16_to_cpu(ea->elength);
289 if (!buffer) {
290 err = 0;
291 goto out;
292 }
293
294 if (len > size) {
295 err = -ERANGE;
296 if (required)
297 *required = len;
298 goto out;
299 }
300
301 memcpy(buffer, ea->name + ea->name_len + 1, len);
302 err = 0;
303
304 out:
305 kfree(ea_all);
306 if (!required)
307 ni_unlock(ni);
308
309 return err ? err : len;
310 }
311
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)312 static noinline int ntfs_set_ea(struct inode *inode, const char *name,
313 size_t name_len, const void *value,
314 size_t val_size, int flags, bool locked,
315 __le16 *ea_size)
316 {
317 struct ntfs_inode *ni = ntfs_i(inode);
318 struct ntfs_sb_info *sbi = ni->mi.sbi;
319 int err;
320 struct EA_INFO ea_info;
321 const struct EA_INFO *info;
322 struct EA_FULL *new_ea;
323 struct EA_FULL *ea_all = NULL;
324 size_t add, new_pack;
325 u32 off, size, ea_sz;
326 __le16 size_pack;
327 struct ATTRIB *attr;
328 struct ATTR_LIST_ENTRY *le;
329 struct mft_inode *mi;
330 struct runs_tree ea_run;
331 u64 new_sz;
332 void *p;
333
334 if (!locked)
335 ni_lock(ni);
336
337 run_init(&ea_run);
338
339 if (name_len > 255) {
340 err = -ENAMETOOLONG;
341 goto out;
342 }
343
344 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
345
346 err = ntfs_read_ea(ni, &ea_all, add, &info);
347 if (err)
348 goto out;
349
350 if (!info) {
351 memset(&ea_info, 0, sizeof(ea_info));
352 size = 0;
353 size_pack = 0;
354 } else {
355 memcpy(&ea_info, info, sizeof(ea_info));
356 size = le32_to_cpu(ea_info.size);
357 size_pack = ea_info.size_pack;
358 }
359
360 if (info && find_ea(ea_all, size, name, name_len, &off, &ea_sz)) {
361 struct EA_FULL *ea;
362
363 if (flags & XATTR_CREATE) {
364 err = -EEXIST;
365 goto out;
366 }
367
368 ea = Add2Ptr(ea_all, off);
369
370 /*
371 * Check simple case when we try to insert xattr with the same value
372 * e.g. ntfs_save_wsl_perm
373 */
374 if (val_size && le16_to_cpu(ea->elength) == val_size &&
375 !memcmp(ea->name + ea->name_len + 1, value, val_size)) {
376 /* xattr already contains the required value. */
377 goto out;
378 }
379
380 /* Remove current xattr. */
381 if (ea->flags & FILE_NEED_EA)
382 le16_add_cpu(&ea_info.count, -1);
383
384 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
385
386 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
387
388 size -= ea_sz;
389 memset(Add2Ptr(ea_all, size), 0, ea_sz);
390
391 ea_info.size = cpu_to_le32(size);
392
393 if ((flags & XATTR_REPLACE) && !val_size) {
394 /* Remove xattr. */
395 goto update_ea;
396 }
397 } else {
398 if (flags & XATTR_REPLACE) {
399 err = -ENODATA;
400 goto out;
401 }
402
403 if (!ea_all) {
404 ea_all = kzalloc(add, GFP_NOFS);
405 if (!ea_all) {
406 err = -ENOMEM;
407 goto out;
408 }
409 }
410 }
411
412 /* Append new xattr. */
413 new_ea = Add2Ptr(ea_all, size);
414 new_ea->size = cpu_to_le32(add);
415 new_ea->flags = 0;
416 new_ea->name_len = name_len;
417 new_ea->elength = cpu_to_le16(val_size);
418 memcpy(new_ea->name, name, name_len);
419 new_ea->name[name_len] = 0;
420 memcpy(new_ea->name + name_len + 1, value, val_size);
421 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
422 ea_info.size_pack = cpu_to_le16(new_pack);
423 /* New size of ATTR_EA. */
424 size += add;
425 ea_info.size = cpu_to_le32(size);
426
427 /*
428 * 1. Check ea_info.size_pack for overflow.
429 * 2. New attribute size must fit value from $AttrDef
430 */
431 if (new_pack > 0xffff || size > sbi->ea_max_size) {
432 ntfs_inode_warn(
433 inode,
434 "The size of extended attributes must not exceed 64KiB");
435 err = -EFBIG; // -EINVAL?
436 goto out;
437 }
438
439 update_ea:
440
441 if (!info) {
442 /* Create xattr. */
443 if (!size) {
444 err = 0;
445 goto out;
446 }
447
448 err = ni_insert_resident(ni, sizeof(struct EA_INFO),
449 ATTR_EA_INFO, NULL, 0, NULL, NULL,
450 NULL);
451 if (err)
452 goto out;
453
454 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL,
455 NULL);
456 if (err)
457 goto out;
458 }
459
460 new_sz = size;
461 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
462 false, NULL);
463 if (err)
464 goto out;
465
466 le = NULL;
467 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
468 if (!attr) {
469 err = -EINVAL;
470 goto out;
471 }
472
473 if (!size) {
474 /* Delete xattr, ATTR_EA_INFO */
475 ni_remove_attr_le(ni, attr, mi, le);
476 } else {
477 p = resident_data_ex(attr, sizeof(struct EA_INFO));
478 if (!p) {
479 err = -EINVAL;
480 goto out;
481 }
482 memcpy(p, &ea_info, sizeof(struct EA_INFO));
483 mi->dirty = true;
484 }
485
486 le = NULL;
487 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
488 if (!attr) {
489 err = -EINVAL;
490 goto out;
491 }
492
493 if (!size) {
494 /* Delete xattr, ATTR_EA */
495 ni_remove_attr_le(ni, attr, mi, le);
496 } else if (attr->non_res) {
497 err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0,
498 size);
499 if (err)
500 goto out;
501
502 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0);
503 if (err)
504 goto out;
505 } else {
506 p = resident_data_ex(attr, size);
507 if (!p) {
508 err = -EINVAL;
509 goto out;
510 }
511 memcpy(p, ea_all, size);
512 mi->dirty = true;
513 }
514
515 /* Check if we delete the last xattr. */
516 if (size)
517 ni->ni_flags |= NI_FLAG_EA;
518 else
519 ni->ni_flags &= ~NI_FLAG_EA;
520
521 if (ea_info.size_pack != size_pack)
522 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
523 if (ea_size)
524 *ea_size = ea_info.size_pack;
525 mark_inode_dirty(&ni->vfs_inode);
526
527 out:
528 if (!locked)
529 ni_unlock(ni);
530
531 run_close(&ea_run);
532 kfree(ea_all);
533
534 return err;
535 }
536
537 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
538
539 /*
540 * ntfs_get_acl - inode_operations::get_acl
541 */
ntfs_get_acl(struct mnt_idmap * idmap,struct dentry * dentry,int type)542 struct posix_acl *ntfs_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
543 int type)
544 {
545 struct inode *inode = d_inode(dentry);
546 struct ntfs_inode *ni = ntfs_i(inode);
547 const char *name;
548 size_t name_len;
549 struct posix_acl *acl;
550 size_t req;
551 int err;
552 void *buf;
553
554 /* Allocate PATH_MAX bytes. */
555 buf = __getname();
556 if (!buf)
557 return ERR_PTR(-ENOMEM);
558
559 /* Possible values of 'type' was already checked above. */
560 if (type == ACL_TYPE_ACCESS) {
561 name = XATTR_NAME_POSIX_ACL_ACCESS;
562 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
563 } else {
564 name = XATTR_NAME_POSIX_ACL_DEFAULT;
565 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
566 }
567
568 ni_lock(ni);
569
570 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
571
572 ni_unlock(ni);
573
574 /* Translate extended attribute to acl. */
575 if (err >= 0) {
576 acl = posix_acl_from_xattr(&init_user_ns, buf, err);
577 } else if (err == -ENODATA) {
578 acl = NULL;
579 } else {
580 acl = ERR_PTR(err);
581 }
582
583 if (!IS_ERR(acl))
584 set_cached_acl(inode, type, acl);
585
586 __putname(buf);
587
588 return acl;
589 }
590
ntfs_set_acl_ex(struct mnt_idmap * idmap,struct inode * inode,struct posix_acl * acl,int type,bool init_acl)591 static noinline int ntfs_set_acl_ex(struct mnt_idmap *idmap,
592 struct inode *inode, struct posix_acl *acl,
593 int type, bool init_acl)
594 {
595 const char *name;
596 size_t size, name_len;
597 void *value;
598 int err;
599 int flags;
600 umode_t mode;
601
602 if (S_ISLNK(inode->i_mode))
603 return -EOPNOTSUPP;
604
605 mode = inode->i_mode;
606 switch (type) {
607 case ACL_TYPE_ACCESS:
608 /* Do not change i_mode if we are in init_acl */
609 if (acl && !init_acl) {
610 err = posix_acl_update_mode(idmap, inode, &mode, &acl);
611 if (err)
612 return err;
613 }
614 name = XATTR_NAME_POSIX_ACL_ACCESS;
615 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
616 break;
617
618 case ACL_TYPE_DEFAULT:
619 if (!S_ISDIR(inode->i_mode))
620 return acl ? -EACCES : 0;
621 name = XATTR_NAME_POSIX_ACL_DEFAULT;
622 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
623 break;
624
625 default:
626 return -EINVAL;
627 }
628
629 if (!acl) {
630 /* Remove xattr if it can be presented via mode. */
631 size = 0;
632 value = NULL;
633 flags = XATTR_REPLACE;
634 } else {
635 size = posix_acl_xattr_size(acl->a_count);
636 value = kmalloc(size, GFP_NOFS);
637 if (!value)
638 return -ENOMEM;
639 err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
640 if (err < 0)
641 goto out;
642 flags = 0;
643 }
644
645 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0, NULL);
646 if (err == -ENODATA && !size)
647 err = 0; /* Removing non existed xattr. */
648 if (!err) {
649 set_cached_acl(inode, type, acl);
650 inode->i_mode = mode;
651 inode_set_ctime_current(inode);
652 mark_inode_dirty(inode);
653 }
654
655 out:
656 kfree(value);
657
658 return err;
659 }
660
661 /*
662 * ntfs_set_acl - inode_operations::set_acl
663 */
ntfs_set_acl(struct mnt_idmap * idmap,struct dentry * dentry,struct posix_acl * acl,int type)664 int ntfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
665 struct posix_acl *acl, int type)
666 {
667 return ntfs_set_acl_ex(idmap, d_inode(dentry), acl, type, false);
668 }
669
670 /*
671 * ntfs_init_acl - Initialize the ACLs of a new inode.
672 *
673 * Called from ntfs_create_inode().
674 */
ntfs_init_acl(struct mnt_idmap * idmap,struct inode * inode,struct inode * dir)675 int ntfs_init_acl(struct mnt_idmap *idmap, struct inode *inode,
676 struct inode *dir)
677 {
678 struct posix_acl *default_acl, *acl;
679 int err;
680
681 err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
682 if (err)
683 return err;
684
685 if (default_acl) {
686 err = ntfs_set_acl_ex(idmap, inode, default_acl,
687 ACL_TYPE_DEFAULT, true);
688 posix_acl_release(default_acl);
689 } else {
690 inode->i_default_acl = NULL;
691 }
692
693 if (acl) {
694 if (!err)
695 err = ntfs_set_acl_ex(idmap, inode, acl,
696 ACL_TYPE_ACCESS, true);
697 posix_acl_release(acl);
698 } else {
699 inode->i_acl = NULL;
700 }
701
702 return err;
703 }
704 #endif
705
706 /*
707 * ntfs_acl_chmod - Helper for ntfs3_setattr().
708 */
ntfs_acl_chmod(struct mnt_idmap * idmap,struct dentry * dentry)709 int ntfs_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry)
710 {
711 struct inode *inode = d_inode(dentry);
712 struct super_block *sb = inode->i_sb;
713
714 if (!(sb->s_flags & SB_POSIXACL))
715 return 0;
716
717 if (S_ISLNK(inode->i_mode))
718 return -EOPNOTSUPP;
719
720 return posix_acl_chmod(idmap, dentry, inode->i_mode);
721 }
722
723 /*
724 * ntfs_listxattr - inode_operations::listxattr
725 */
ntfs_listxattr(struct dentry * dentry,char * buffer,size_t size)726 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
727 {
728 struct inode *inode = d_inode(dentry);
729 struct ntfs_inode *ni = ntfs_i(inode);
730 ssize_t ret;
731
732 if (!(ni->ni_flags & NI_FLAG_EA)) {
733 /* no xattr in file */
734 return 0;
735 }
736
737 ni_lock(ni);
738
739 ret = ntfs_list_ea(ni, buffer, size);
740
741 ni_unlock(ni);
742
743 return ret;
744 }
745
ntfs_getxattr(const struct xattr_handler * handler,struct dentry * de,struct inode * inode,const char * name,void * buffer,size_t size)746 static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
747 struct inode *inode, const char *name, void *buffer,
748 size_t size)
749 {
750 int err;
751 struct ntfs_inode *ni = ntfs_i(inode);
752
753 if (unlikely(ntfs3_forced_shutdown(inode->i_sb)))
754 return -EIO;
755
756 /* Dispatch request. */
757 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
758 /* system.dos_attrib */
759 if (!buffer) {
760 err = sizeof(u8);
761 } else if (size < sizeof(u8)) {
762 err = -ENODATA;
763 } else {
764 err = sizeof(u8);
765 *(u8 *)buffer = le32_to_cpu(ni->std_fa);
766 }
767 goto out;
768 }
769
770 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
771 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
772 /* system.ntfs_attrib */
773 if (!buffer) {
774 err = sizeof(u32);
775 } else if (size < sizeof(u32)) {
776 err = -ENODATA;
777 } else {
778 err = sizeof(u32);
779 *(u32 *)buffer = le32_to_cpu(ni->std_fa);
780 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
781 *(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer);
782 }
783 goto out;
784 }
785
786 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
787 /* system.ntfs_security*/
788 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
789 size_t sd_size = 0;
790
791 if (!is_ntfs3(ni->mi.sbi)) {
792 /* We should get nt4 security. */
793 err = -EINVAL;
794 goto out;
795 } else if (le32_to_cpu(ni->std_security_id) <
796 SECURITY_ID_FIRST) {
797 err = -ENOENT;
798 goto out;
799 }
800
801 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
802 &sd, &sd_size);
803 if (err)
804 goto out;
805
806 if (!is_sd_valid(sd, sd_size)) {
807 ntfs_inode_warn(
808 inode,
809 "looks like you get incorrect security descriptor id=%u",
810 ni->std_security_id);
811 }
812
813 if (!buffer) {
814 err = sd_size;
815 } else if (size < sd_size) {
816 err = -ENODATA;
817 } else {
818 err = sd_size;
819 memcpy(buffer, sd, sd_size);
820 }
821 kfree(sd);
822 goto out;
823 }
824
825 /* Deal with NTFS extended attribute. */
826 err = ntfs_get_ea(inode, name, strlen(name), buffer, size, NULL);
827
828 out:
829 return err;
830 }
831
832 /*
833 * ntfs_setxattr - inode_operations::setxattr
834 */
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)835 static noinline int ntfs_setxattr(const struct xattr_handler *handler,
836 struct mnt_idmap *idmap, struct dentry *de,
837 struct inode *inode, const char *name,
838 const void *value, size_t size, int flags)
839 {
840 int err = -EINVAL;
841 struct ntfs_inode *ni = ntfs_i(inode);
842 enum FILE_ATTRIBUTE new_fa;
843
844 /* Dispatch request. */
845 if (!strcmp(name, SYSTEM_DOS_ATTRIB)) {
846 if (sizeof(u8) != size)
847 goto out;
848 new_fa = cpu_to_le32(*(u8 *)value);
849 goto set_new_fa;
850 }
851
852 if (!strcmp(name, SYSTEM_NTFS_ATTRIB) ||
853 !strcmp(name, SYSTEM_NTFS_ATTRIB_BE)) {
854 if (size != sizeof(u32))
855 goto out;
856 if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
857 new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value));
858 else
859 new_fa = cpu_to_le32(*(u32 *)value);
860
861 if (S_ISREG(inode->i_mode)) {
862 /* Process compressed/sparsed in special way. */
863 ni_lock(ni);
864 err = ni_new_attr_flags(ni, new_fa);
865 ni_unlock(ni);
866 if (err)
867 goto out;
868 }
869 set_new_fa:
870 /*
871 * Thanks Mark Harmstone:
872 * Keep directory bit consistency.
873 */
874 if (S_ISDIR(inode->i_mode))
875 new_fa |= FILE_ATTRIBUTE_DIRECTORY;
876 else
877 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
878
879 if (ni->std_fa != new_fa) {
880 ni->std_fa = new_fa;
881 if (new_fa & FILE_ATTRIBUTE_READONLY)
882 inode->i_mode &= ~0222;
883 else
884 inode->i_mode |= 0222;
885 /* Std attribute always in primary record. */
886 ni->mi.dirty = true;
887 mark_inode_dirty(inode);
888 }
889 err = 0;
890
891 goto out;
892 }
893
894 if (!strcmp(name, SYSTEM_NTFS_SECURITY)) {
895 /* system.ntfs_security*/
896 __le32 security_id;
897 bool inserted;
898 struct ATTR_STD_INFO5 *std;
899
900 if (!is_ntfs3(ni->mi.sbi)) {
901 /*
902 * We should replace ATTR_SECURE.
903 * Skip this way cause it is nt4 feature.
904 */
905 err = -EINVAL;
906 goto out;
907 }
908
909 if (!is_sd_valid(value, size)) {
910 err = -EINVAL;
911 ntfs_inode_warn(
912 inode,
913 "you try to set invalid security descriptor");
914 goto out;
915 }
916
917 err = ntfs_insert_security(ni->mi.sbi, value, size,
918 &security_id, &inserted);
919 if (err)
920 goto out;
921
922 ni_lock(ni);
923 std = ni_std5(ni);
924 if (!std) {
925 err = -EINVAL;
926 } else if (std->security_id != security_id) {
927 std->security_id = ni->std_security_id = security_id;
928 /* Std attribute always in primary record. */
929 ni->mi.dirty = true;
930 mark_inode_dirty(&ni->vfs_inode);
931 }
932 ni_unlock(ni);
933 goto out;
934 }
935
936 /* Deal with NTFS extended attribute. */
937 err = ntfs_set_ea(inode, name, strlen(name), value, size, flags, 0,
938 NULL);
939
940 out:
941 inode_set_ctime_current(inode);
942 mark_inode_dirty(inode);
943
944 return err;
945 }
946
947 /*
948 * ntfs_save_wsl_perm
949 *
950 * save uid/gid/mode in xattr
951 */
ntfs_save_wsl_perm(struct inode * inode,__le16 * ea_size)952 int ntfs_save_wsl_perm(struct inode *inode, __le16 *ea_size)
953 {
954 int err;
955 __le32 value;
956 struct ntfs_inode *ni = ntfs_i(inode);
957
958 ni_lock(ni);
959 value = cpu_to_le32(i_uid_read(inode));
960 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
961 sizeof(value), 0, true, ea_size);
962 if (err)
963 goto out;
964
965 value = cpu_to_le32(i_gid_read(inode));
966 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
967 sizeof(value), 0, true, ea_size);
968 if (err)
969 goto out;
970
971 value = cpu_to_le32(inode->i_mode);
972 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
973 sizeof(value), 0, true, ea_size);
974 if (err)
975 goto out;
976
977 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
978 value = cpu_to_le32(inode->i_rdev);
979 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
980 sizeof(value), 0, true, ea_size);
981 if (err)
982 goto out;
983 }
984
985 out:
986 ni_unlock(ni);
987 /* In case of error should we delete all WSL xattr? */
988 return err;
989 }
990
991 /*
992 * ntfs_get_wsl_perm
993 *
994 * get uid/gid/mode from xattr
995 * it is called from ntfs_iget5->ntfs_read_mft
996 */
ntfs_get_wsl_perm(struct inode * inode)997 void ntfs_get_wsl_perm(struct inode *inode)
998 {
999 size_t sz;
1000 __le32 value[3];
1001
1002 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
1003 sizeof(value[0]), &sz) == sizeof(value[0]) &&
1004 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
1005 sizeof(value[1]), &sz) == sizeof(value[1]) &&
1006 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
1007 sizeof(value[2]), &sz) == sizeof(value[2])) {
1008 i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
1009 i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
1010 inode->i_mode = le32_to_cpu(value[2]);
1011
1012 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
1013 &value[0], sizeof(value),
1014 &sz) == sizeof(value[0])) {
1015 inode->i_rdev = le32_to_cpu(value[0]);
1016 }
1017 }
1018 }
1019
ntfs_xattr_user_list(struct dentry * dentry)1020 static bool ntfs_xattr_user_list(struct dentry *dentry)
1021 {
1022 return true;
1023 }
1024
1025 // clang-format off
1026 static const struct xattr_handler ntfs_other_xattr_handler = {
1027 .prefix = "",
1028 .get = ntfs_getxattr,
1029 .set = ntfs_setxattr,
1030 .list = ntfs_xattr_user_list,
1031 };
1032
1033 const struct xattr_handler *ntfs_xattr_handlers[] = {
1034 &ntfs_other_xattr_handler,
1035 NULL,
1036 };
1037 // clang-format on
1038