]> git.proxmox.com Git - mirror_ubuntu-kernels.git/blame - fs/ntfs3/xattr.c
projects / mirror_ubuntu-kernels.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
fs/ntfs3: Restyle comments to better align with kernel-doc
[mirror_ubuntu-kernels.git] / fs / ntfs3 / xattr.c
CommitLineData
be71b5cb
KK		 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/blkdev.h>
9#include <linux/buffer_head.h>
10#include <linux/fs.h>
11#include <linux/nls.h>
12#include <linux/posix_acl.h>
13#include <linux/posix_acl_xattr.h>
14#include <linux/xattr.h>
15
16#include "debug.h"
17#include "ntfs.h"
18#include "ntfs_fs.h"
19
20// clang-format off
21#define SYSTEM_DOS_ATTRIB "system.dos_attrib"
22#define SYSTEM_NTFS_ATTRIB "system.ntfs_attrib"
23#define SYSTEM_NTFS_SECURITY "system.ntfs_security"
24// clang-format on
25
26static inline size_t unpacked_ea_size(const struct EA_FULL *ea)
27{
28 return ea->size ? le32_to_cpu(ea->size)
fa3cacf5
KA		 29 : ALIGN(struct_size(
30 ea, name,
31 1 + ea->name_len + le16_to_cpu(ea->elength)), 4);
be71b5cb
KK		 32}
33
34static inline size_t packed_ea_size(const struct EA_FULL *ea)
35{
36 return struct_size(ea, name,
37 1 + ea->name_len + le16_to_cpu(ea->elength)) -
38 offsetof(struct EA_FULL, flags);
39}
40
41/*
42 * find_ea
43 *
e8b8e97f 44 * Assume there is at least one xattr in the list.
be71b5cb
KK		 45 */
46static inline bool find_ea(const struct EA_FULL *ea_all, u32 bytes,
47 const char *name, u8 name_len, u32 *off)
48{
49 *off = 0;
50
51 if (!ea_all || !bytes)
52 return false;
53
54 for (;;) {
55 const struct EA_FULL *ea = Add2Ptr(ea_all, *off);
56 u32 next_off = *off + unpacked_ea_size(ea);
57
58 if (next_off > bytes)
59 return false;
60
61 if (ea->name_len == name_len &&
62 !memcmp(ea->name, name, name_len))
63 return true;
64
65 *off = next_off;
66 if (next_off >= bytes)
67 return false;
68 }
69}
70
71/*
e8b8e97f
KA		 72 * ntfs_read_ea - Read all extended attributes.
73 * @ea: New allocated memory.
74 * @info: Pointer into resident data.
be71b5cb
KK		 75 */
76static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
77 size_t add_bytes, const struct EA_INFO **info)
78{
79 int err;
80 struct ATTR_LIST_ENTRY *le = NULL;
81 struct ATTRIB *attr_info, *attr_ea;
82 void *ea_p;
83 u32 size;
84
85 static_assert(le32_to_cpu(ATTR_EA_INFO) < le32_to_cpu(ATTR_EA));
86
87 *ea = NULL;
88 *info = NULL;
89
90 attr_info =
91 ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, NULL);
92 attr_ea =
93 ni_find_attr(ni, attr_info, &le, ATTR_EA, NULL, 0, NULL, NULL);
94
95 if (!attr_ea || !attr_info)
96 return 0;
97
98 *info = resident_data_ex(attr_info, sizeof(struct EA_INFO));
99 if (!*info)
100 return -EINVAL;
101
e8b8e97f 102 /* Check Ea limit. */
be71b5cb
KK		 103 size = le32_to_cpu((*info)->size);
104 if (size > ni->mi.sbi->ea_max_size)
105 return -EFBIG;
106
107 if (attr_size(attr_ea) > ni->mi.sbi->ea_max_size)
108 return -EFBIG;
109
e8b8e97f 110 /* Allocate memory for packed Ea. */
195c52bd 111 ea_p = kmalloc(size + add_bytes, GFP_NOFS);
be71b5cb
KK		 112 if (!ea_p)
113 return -ENOMEM;
114
115 if (attr_ea->non_res) {
116 struct runs_tree run;
117
118 run_init(&run);
119
120 err = attr_load_runs(attr_ea, ni, &run, NULL);
121 if (!err)
122 err = ntfs_read_run_nb(ni->mi.sbi, &run, 0, ea_p, size,
123 NULL);
124 run_close(&run);
125
126 if (err)
127 goto out;
128 } else {
129 void *p = resident_data_ex(attr_ea, size);
130
131 if (!p) {
132 err = -EINVAL;
133 goto out;
134 }
135 memcpy(ea_p, p, size);
136 }
137
138 memset(Add2Ptr(ea_p, size), 0, add_bytes);
139 *ea = ea_p;
140 return 0;
141
142out:
195c52bd 143 kfree(ea_p);
be71b5cb
KK		 144 *ea = NULL;
145 return err;
146}
147
148/*
149 * ntfs_list_ea
150 *
e8b8e97f
KA		 151 * Copy a list of xattrs names into the buffer
152 * provided, or compute the buffer size required.
be71b5cb 153 *
e8b8e97f
KA		 154 * Return:
155 * * Number of bytes used / required on
156 * * -ERRNO - on failure
be71b5cb
KK		 157 */
158static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
159 size_t bytes_per_buffer)
160{
161 const struct EA_INFO *info;
162 struct EA_FULL *ea_all = NULL;
163 const struct EA_FULL *ea;
164 u32 off, size;
165 int err;
166 size_t ret;
167
168 err = ntfs_read_ea(ni, &ea_all, 0, &info);
169 if (err)
170 return err;
171
172 if (!info || !ea_all)
173 return 0;
174
175 size = le32_to_cpu(info->size);
176
e8b8e97f 177 /* Enumerate all xattrs. */
be71b5cb
KK		 178 for (ret = 0, off = 0; off < size; off += unpacked_ea_size(ea)) {
179 ea = Add2Ptr(ea_all, off);
180
181 if (buffer) {
182 if (ret + ea->name_len + 1 > bytes_per_buffer) {
183 err = -ERANGE;
184 goto out;
185 }
186
187 memcpy(buffer + ret, ea->name, ea->name_len);
188 buffer[ret + ea->name_len] = 0;
189 }
190
191 ret += ea->name_len + 1;
192 }
193
194out:
195c52bd 195 kfree(ea_all);
be71b5cb
KK		 196 return err ? err : ret;
197}
198
199static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
200 void *buffer, size_t size, size_t *required)
201{
202 struct ntfs_inode *ni = ntfs_i(inode);
203 const struct EA_INFO *info;
204 struct EA_FULL *ea_all = NULL;
205 const struct EA_FULL *ea;
206 u32 off, len;
207 int err;
208
209 if (!(ni->ni_flags & NI_FLAG_EA))
210 return -ENODATA;
211
212 if (!required)
213 ni_lock(ni);
214
215 len = 0;
216
217 if (name_len > 255) {
218 err = -ENAMETOOLONG;
219 goto out;
220 }
221
222 err = ntfs_read_ea(ni, &ea_all, 0, &info);
223 if (err)
224 goto out;
225
226 if (!info)
227 goto out;
228
e8b8e97f 229 /* Enumerate all xattrs. */
be71b5cb
KK		 230 if (!find_ea(ea_all, le32_to_cpu(info->size), name, name_len, &off)) {
231 err = -ENODATA;
232 goto out;
233 }
234 ea = Add2Ptr(ea_all, off);
235
236 len = le16_to_cpu(ea->elength);
237 if (!buffer) {
238 err = 0;
239 goto out;
240 }
241
242 if (len > size) {
243 err = -ERANGE;
244 if (required)
245 *required = len;
246 goto out;
247 }
248
249 memcpy(buffer, ea->name + ea->name_len + 1, len);
250 err = 0;
251
252out:
195c52bd 253 kfree(ea_all);
be71b5cb
KK		 254 if (!required)
255 ni_unlock(ni);
256
257 return err ? err : len;
258}
259
260static noinline int ntfs_set_ea(struct inode *inode, const char *name,
261 size_t name_len, const void *value,
262 size_t val_size, int flags, int locked)
263{
264 struct ntfs_inode *ni = ntfs_i(inode);
265 struct ntfs_sb_info *sbi = ni->mi.sbi;
266 int err;
267 struct EA_INFO ea_info;
268 const struct EA_INFO *info;
269 struct EA_FULL *new_ea;
270 struct EA_FULL *ea_all = NULL;
271 size_t add, new_pack;
272 u32 off, size;
273 __le16 size_pack;
274 struct ATTRIB *attr;
275 struct ATTR_LIST_ENTRY *le;
276 struct mft_inode *mi;
277 struct runs_tree ea_run;
278 u64 new_sz;
279 void *p;
280
281 if (!locked)
282 ni_lock(ni);
283
284 run_init(&ea_run);
285
286 if (name_len > 255) {
287 err = -ENAMETOOLONG;
288 goto out;
289 }
290
fa3cacf5 291 add = ALIGN(struct_size(ea_all, name, 1 + name_len + val_size), 4);
be71b5cb
KK		 292
293 err = ntfs_read_ea(ni, &ea_all, add, &info);
294 if (err)
295 goto out;
296
297 if (!info) {
298 memset(&ea_info, 0, sizeof(ea_info));
299 size = 0;
300 size_pack = 0;
301 } else {
302 memcpy(&ea_info, info, sizeof(ea_info));
303 size = le32_to_cpu(ea_info.size);
304 size_pack = ea_info.size_pack;
305 }
306
307 if (info && find_ea(ea_all, size, name, name_len, &off)) {
308 struct EA_FULL *ea;
309 size_t ea_sz;
310
311 if (flags & XATTR_CREATE) {
312 err = -EEXIST;
313 goto out;
314 }
315
316 ea = Add2Ptr(ea_all, off);
317
318 /*
319 * Check simple case when we try to insert xattr with the same value
320 * e.g. ntfs_save_wsl_perm
321 */
322 if (val_size && le16_to_cpu(ea->elength) == val_size &&
323 !memcmp(ea->name + ea->name_len + 1, value, val_size)) {
e8b8e97f 324 /* xattr already contains the required value. */
be71b5cb
KK		 325 goto out;
326 }
327
e8b8e97f 328 /* Remove current xattr. */
be71b5cb
KK		 329 if (ea->flags & FILE_NEED_EA)
330 le16_add_cpu(&ea_info.count, -1);
331
332 ea_sz = unpacked_ea_size(ea);
333
334 le16_add_cpu(&ea_info.size_pack, 0 - packed_ea_size(ea));
335
336 memmove(ea, Add2Ptr(ea, ea_sz), size - off - ea_sz);
337
338 size -= ea_sz;
339 memset(Add2Ptr(ea_all, size), 0, ea_sz);
340
341 ea_info.size = cpu_to_le32(size);
342
343 if ((flags & XATTR_REPLACE) && !val_size) {
e8b8e97f 344 /* Remove xattr. */
be71b5cb
KK		 345 goto update_ea;
346 }
347 } else {
348 if (flags & XATTR_REPLACE) {
349 err = -ENODATA;
350 goto out;
351 }
352
353 if (!ea_all) {
195c52bd 354 ea_all = kzalloc(add, GFP_NOFS);
be71b5cb
KK		 355 if (!ea_all) {
356 err = -ENOMEM;
357 goto out;
358 }
359 }
360 }
361
e8b8e97f 362 /* Append new xattr. */
be71b5cb
KK		 363 new_ea = Add2Ptr(ea_all, size);
364 new_ea->size = cpu_to_le32(add);
365 new_ea->flags = 0;
366 new_ea->name_len = name_len;
367 new_ea->elength = cpu_to_le16(val_size);
368 memcpy(new_ea->name, name, name_len);
369 new_ea->name[name_len] = 0;
370 memcpy(new_ea->name + name_len + 1, value, val_size);
371 new_pack = le16_to_cpu(ea_info.size_pack) + packed_ea_size(new_ea);
372
e8b8e97f 373 /* Should fit into 16 bits. */
be71b5cb
KK		 374 if (new_pack > 0xffff) {
375 err = -EFBIG; // -EINVAL?
376 goto out;
377 }
378 ea_info.size_pack = cpu_to_le16(new_pack);
379
e8b8e97f 380 /* New size of ATTR_EA. */
be71b5cb
KK		 381 size += add;
382 if (size > sbi->ea_max_size) {
383 err = -EFBIG; // -EINVAL?
384 goto out;
385 }
386 ea_info.size = cpu_to_le32(size);
387
388update_ea:
389
390 if (!info) {
e8b8e97f 391 /* Create xattr. */
be71b5cb
KK		 392 if (!size) {
393 err = 0;
394 goto out;
395 }
396
397 err = ni_insert_resident(ni, sizeof(struct EA_INFO),
398 ATTR_EA_INFO, NULL, 0, NULL, NULL);
399 if (err)
400 goto out;
401
402 err = ni_insert_resident(ni, 0, ATTR_EA, NULL, 0, NULL, NULL);
403 if (err)
404 goto out;
405 }
406
407 new_sz = size;
408 err = attr_set_size(ni, ATTR_EA, NULL, 0, &ea_run, new_sz, &new_sz,
409 false, NULL);
410 if (err)
411 goto out;
412
413 le = NULL;
414 attr = ni_find_attr(ni, NULL, &le, ATTR_EA_INFO, NULL, 0, NULL, &mi);
415 if (!attr) {
416 err = -EINVAL;
417 goto out;
418 }
419
420 if (!size) {
e8b8e97f 421 /* Delete xattr, ATTR_EA_INFO */
be71b5cb
KK		 422 err = ni_remove_attr_le(ni, attr, le);
423 if (err)
424 goto out;
425 } else {
426 p = resident_data_ex(attr, sizeof(struct EA_INFO));
427 if (!p) {
428 err = -EINVAL;
429 goto out;
430 }
431 memcpy(p, &ea_info, sizeof(struct EA_INFO));
432 mi->dirty = true;
433 }
434
435 le = NULL;
436 attr = ni_find_attr(ni, NULL, &le, ATTR_EA, NULL, 0, NULL, &mi);
437 if (!attr) {
438 err = -EINVAL;
439 goto out;
440 }
441
442 if (!size) {
e8b8e97f 443 /* Delete xattr, ATTR_EA */
be71b5cb
KK		 444 err = ni_remove_attr_le(ni, attr, le);
445 if (err)
446 goto out;
447 } else if (attr->non_res) {
448 err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size);
449 if (err)
450 goto out;
451 } else {
452 p = resident_data_ex(attr, size);
453 if (!p) {
454 err = -EINVAL;
455 goto out;
456 }
457 memcpy(p, ea_all, size);
458 mi->dirty = true;
459 }
460
e8b8e97f 461 /* Check if we delete the last xattr. */
be71b5cb
KK		 462 if (size)
463 ni->ni_flags |= NI_FLAG_EA;
464 else
465 ni->ni_flags &= ~NI_FLAG_EA;
466
467 if (ea_info.size_pack != size_pack)
468 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
469 mark_inode_dirty(&ni->vfs_inode);
470
471out:
472 if (!locked)
473 ni_unlock(ni);
474
475 run_close(&ea_run);
195c52bd 476 kfree(ea_all);
be71b5cb
KK		 477
478 return err;
479}
480
481#ifdef CONFIG_NTFS3_FS_POSIX_ACL
482static inline void ntfs_posix_acl_release(struct posix_acl *acl)
483{
484 if (acl && refcount_dec_and_test(&acl->a_refcount))
485 kfree(acl);
486}
487
488static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns,
489 struct inode *inode, int type,
490 int locked)
491{
492 struct ntfs_inode *ni = ntfs_i(inode);
493 const char *name;
494 size_t name_len;
495 struct posix_acl *acl;
496 size_t req;
497 int err;
498 void *buf;
499
e8b8e97f 500 /* Allocate PATH_MAX bytes. */
be71b5cb
KK		 501 buf = __getname();
502 if (!buf)
503 return ERR_PTR(-ENOMEM);
504
e8b8e97f 505 /* Possible values of 'type' was already checked above. */
be71b5cb
KK		 506 if (type == ACL_TYPE_ACCESS) {
507 name = XATTR_NAME_POSIX_ACL_ACCESS;
508 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
509 } else {
510 name = XATTR_NAME_POSIX_ACL_DEFAULT;
511 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
512 }
513
514 if (!locked)
515 ni_lock(ni);
516
517 err = ntfs_get_ea(inode, name, name_len, buf, PATH_MAX, &req);
518
519 if (!locked)
520 ni_unlock(ni);
521
e8b8e97f 522 /* Translate extended attribute to acl. */
2926e429 523 if (err >= 0) {
be71b5cb
KK		 524 acl = posix_acl_from_xattr(mnt_userns, buf, err);
525 if (!IS_ERR(acl))
526 set_cached_acl(inode, type, acl);
527 } else {
528 acl = err == -ENODATA ? NULL : ERR_PTR(err);
529 }
530
531 __putname(buf);
532
533 return acl;
534}
535
536/*
e8b8e97f 537 * ntfs_get_acl - inode_operations::get_acl
be71b5cb
KK		 538 */
539struct posix_acl *ntfs_get_acl(struct inode *inode, int type)
540{
541 /* TODO: init_user_ns? */
542 return ntfs_get_acl_ex(&init_user_ns, inode, type, 0);
543}
544
545static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
546 struct inode *inode, struct posix_acl *acl,
547 int type, int locked)
548{
549 const char *name;
550 size_t size, name_len;
551 void *value = NULL;
552 int err = 0;
553
554 if (S_ISLNK(inode->i_mode))
555 return -EOPNOTSUPP;
556
557 switch (type) {
558 case ACL_TYPE_ACCESS:
559 if (acl) {
560 umode_t mode = inode->i_mode;
561
562 err = posix_acl_equiv_mode(acl, &mode);
563 if (err < 0)
564 return err;
565
566 if (inode->i_mode != mode) {
567 inode->i_mode = mode;
568 mark_inode_dirty(inode);
569 }
570
571 if (!err) {
572 /*
e8b8e97f
KA		 573 * ACL can be exactly represented in the
574 * traditional file mode permission bits.
be71b5cb
KK		 575 */
576 acl = NULL;
577 }
578 }
579 name = XATTR_NAME_POSIX_ACL_ACCESS;
580 name_len = sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1;
581 break;
582
583 case ACL_TYPE_DEFAULT:
584 if (!S_ISDIR(inode->i_mode))
585 return acl ? -EACCES : 0;
586 name = XATTR_NAME_POSIX_ACL_DEFAULT;
587 name_len = sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1;
588 break;
589
590 default:
591 return -EINVAL;
592 }
593
594 if (!acl) {
595 size = 0;
596 value = NULL;
597 } else {
598 size = posix_acl_xattr_size(acl->a_count);
195c52bd 599 value = kmalloc(size, GFP_NOFS);
be71b5cb
KK		 600 if (!value)
601 return -ENOMEM;
602
603 err = posix_acl_to_xattr(mnt_userns, acl, value, size);
604 if (err < 0)
605 goto out;
606 }
607
608 err = ntfs_set_ea(inode, name, name_len, value, size,
609 acl ? 0 : XATTR_REPLACE, locked);
610 if (!err)
611 set_cached_acl(inode, type, acl);
612
613out:
195c52bd 614 kfree(value);
be71b5cb
KK		 615
616 return err;
617}
618
619/*
e8b8e97f 620 * ntfs_set_acl - inode_operations::set_acl
be71b5cb
KK		 621 */
622int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
623 struct posix_acl *acl, int type)
624{
625 return ntfs_set_acl_ex(mnt_userns, inode, acl, type, 0);
626}
627
628static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
629 struct inode *inode, int type, void *buffer,
630 size_t size)
631{
632 struct posix_acl *acl;
633 int err;
634
635 if (!(inode->i_sb->s_flags & SB_POSIXACL))
636 return -EOPNOTSUPP;
637
638 acl = ntfs_get_acl(inode, type);
639 if (IS_ERR(acl))
640 return PTR_ERR(acl);
641
642 if (!acl)
643 return -ENODATA;
644
645 err = posix_acl_to_xattr(mnt_userns, acl, buffer, size);
646 ntfs_posix_acl_release(acl);
647
648 return err;
649}
650
651static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
652 struct inode *inode, int type, const void *value,
653 size_t size)
654{
655 struct posix_acl *acl;
656 int err;
657
658 if (!(inode->i_sb->s_flags & SB_POSIXACL))
659 return -EOPNOTSUPP;
660
661 if (!inode_owner_or_capable(mnt_userns, inode))
662 return -EPERM;
663
664 if (!value) {
665 acl = NULL;
666 } else {
667 acl = posix_acl_from_xattr(mnt_userns, value, size);
668 if (IS_ERR(acl))
669 return PTR_ERR(acl);
670
671 if (acl) {
672 err = posix_acl_valid(mnt_userns, acl);
673 if (err)
674 goto release_and_out;
675 }
676 }
677
678 err = ntfs_set_acl(mnt_userns, inode, acl, type);
679
680release_and_out:
681 ntfs_posix_acl_release(acl);
682 return err;
683}
684
685/*
e8b8e97f
KA		 686 * ntfs_init_acl - Initialize the ACLs of a new inode.
687 *
688 * Called from ntfs_create_inode().
be71b5cb
KK		 689 */
690int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
691 struct inode *dir)
692{
693 struct posix_acl *default_acl, *acl;
694 int err;
695
696 /*
e8b8e97f 697 * TODO: Refactoring lock.
be71b5cb
KK		 698 * ni_lock(dir) ... -> posix_acl_create(dir,...) -> ntfs_get_acl -> ni_lock(dir)
699 */
700 inode->i_default_acl = NULL;
701
702 default_acl = ntfs_get_acl_ex(mnt_userns, dir, ACL_TYPE_DEFAULT, 1);
703
704 if (!default_acl || default_acl == ERR_PTR(-EOPNOTSUPP)) {
705 inode->i_mode &= ~current_umask();
706 err = 0;
707 goto out;
708 }
709
710 if (IS_ERR(default_acl)) {
711 err = PTR_ERR(default_acl);
712 goto out;
713 }
714
715 acl = default_acl;
716 err = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
717 if (err < 0)
718 goto out1;
719 if (!err) {
720 posix_acl_release(acl);
721 acl = NULL;
722 }
723
724 if (!S_ISDIR(inode->i_mode)) {
725 posix_acl_release(default_acl);
726 default_acl = NULL;
727 }
728
729 if (default_acl)
730 err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
731 ACL_TYPE_DEFAULT, 1);
732
733 if (!acl)
734 inode->i_acl = NULL;
735 else if (!err)
736 err = ntfs_set_acl_ex(mnt_userns, inode, acl, ACL_TYPE_ACCESS,
737 1);
738
739 posix_acl_release(acl);
740out1:
741 posix_acl_release(default_acl);
742
743out:
744 return err;
745}
746#endif
747
748/*
e8b8e97f 749 * ntfs_acl_chmod - Helper for ntfs3_setattr().
be71b5cb
KK		 750 */
751int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode)
752{
753 struct super_block *sb = inode->i_sb;
754
755 if (!(sb->s_flags & SB_POSIXACL))
756 return 0;
757
758 if (S_ISLNK(inode->i_mode))
759 return -EOPNOTSUPP;
760
761 return posix_acl_chmod(mnt_userns, inode, inode->i_mode);
762}
763
764/*
e8b8e97f 765 * ntfs_permission - inode_operations::permission
be71b5cb
KK		 766 */
767int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
768 int mask)
769{
770 if (ntfs_sb(inode->i_sb)->options.no_acs_rules) {
e8b8e97f 771 /* "No access rules" mode - Allow all changes. */
be71b5cb
KK		 772 return 0;
773 }
774
775 return generic_permission(mnt_userns, inode, mask);
776}
777
778/*
e8b8e97f 779 * ntfs_listxattr - inode_operations::listxattr
be71b5cb
KK		 780 */
781ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
782{
783 struct inode *inode = d_inode(dentry);
784 struct ntfs_inode *ni = ntfs_i(inode);
785 ssize_t ret;
786
787 if (!(ni->ni_flags & NI_FLAG_EA)) {
788 /* no xattr in file */
789 return 0;
790 }
791
792 ni_lock(ni);
793
794 ret = ntfs_list_ea(ni, buffer, size);
795
796 ni_unlock(ni);
797
798 return ret;
799}
800
801static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
802 struct inode *inode, const char *name, void *buffer,
803 size_t size)
804{
805 int err;
806 struct ntfs_inode *ni = ntfs_i(inode);
807 size_t name_len = strlen(name);
808
e8b8e97f 809 /* Dispatch request. */
be71b5cb
KK		 810 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
811 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
812 /* system.dos_attrib */
813 if (!buffer) {
814 err = sizeof(u8);
815 } else if (size < sizeof(u8)) {
816 err = -ENODATA;
817 } else {
818 err = sizeof(u8);
819 *(u8 *)buffer = le32_to_cpu(ni->std_fa);
820 }
821 goto out;
822 }
823
824 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
825 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
826 /* system.ntfs_attrib */
827 if (!buffer) {
828 err = sizeof(u32);
829 } else if (size < sizeof(u32)) {
830 err = -ENODATA;
831 } else {
832 err = sizeof(u32);
833 *(u32 *)buffer = le32_to_cpu(ni->std_fa);
834 }
835 goto out;
836 }
837
838 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
839 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
840 /* system.ntfs_security*/
841 struct SECURITY_DESCRIPTOR_RELATIVE *sd = NULL;
842 size_t sd_size = 0;
843
844 if (!is_ntfs3(ni->mi.sbi)) {
e8b8e97f 845 /* We should get nt4 security. */
be71b5cb
KK		 846 err = -EINVAL;
847 goto out;
848 } else if (le32_to_cpu(ni->std_security_id) <
849 SECURITY_ID_FIRST) {
850 err = -ENOENT;
851 goto out;
852 }
853
854 err = ntfs_get_security_by_id(ni->mi.sbi, ni->std_security_id,
855 &sd, &sd_size);
856 if (err)
857 goto out;
858
859 if (!is_sd_valid(sd, sd_size)) {
860 ntfs_inode_warn(
861 inode,
862 "looks like you get incorrect security descriptor id=%u",
863 ni->std_security_id);
864 }
865
866 if (!buffer) {
867 err = sd_size;
868 } else if (size < sd_size) {
869 err = -ENODATA;
870 } else {
871 err = sd_size;
872 memcpy(buffer, sd, sd_size);
873 }
195c52bd 874 kfree(sd);
be71b5cb
KK		 875 goto out;
876 }
877
878#ifdef CONFIG_NTFS3_FS_POSIX_ACL
879 if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
880 !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
881 sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
882 (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
883 !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
884 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
885 /* TODO: init_user_ns? */
886 err = ntfs_xattr_get_acl(
887 &init_user_ns, inode,
888 name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
889 ? ACL_TYPE_ACCESS
890 : ACL_TYPE_DEFAULT,
891 buffer, size);
892 goto out;
893 }
894#endif
e8b8e97f 895 /* Deal with NTFS extended attribute. */
be71b5cb
KK		 896 err = ntfs_get_ea(inode, name, name_len, buffer, size, NULL);
897
898out:
899 return err;
900}
901
902/*
e8b8e97f 903 * ntfs_setxattr - inode_operations::setxattr
be71b5cb
KK		 904 */
905static noinline int ntfs_setxattr(const struct xattr_handler *handler,
906 struct user_namespace *mnt_userns,
907 struct dentry *de, struct inode *inode,
908 const char *name, const void *value,
909 size_t size, int flags)
910{
911 int err = -EINVAL;
912 struct ntfs_inode *ni = ntfs_i(inode);
913 size_t name_len = strlen(name);
914 enum FILE_ATTRIBUTE new_fa;
915
e8b8e97f 916 /* Dispatch request. */
be71b5cb
KK		 917 if (name_len == sizeof(SYSTEM_DOS_ATTRIB) - 1 &&
918 !memcmp(name, SYSTEM_DOS_ATTRIB, sizeof(SYSTEM_DOS_ATTRIB))) {
919 if (sizeof(u8) != size)
920 goto out;
921 new_fa = cpu_to_le32(*(u8 *)value);
922 goto set_new_fa;
923 }
924
925 if (name_len == sizeof(SYSTEM_NTFS_ATTRIB) - 1 &&
926 !memcmp(name, SYSTEM_NTFS_ATTRIB, sizeof(SYSTEM_NTFS_ATTRIB))) {
927 if (size != sizeof(u32))
928 goto out;
929 new_fa = cpu_to_le32(*(u32 *)value);
930
931 if (S_ISREG(inode->i_mode)) {
e8b8e97f 932 /* Process compressed/sparsed in special way. */
be71b5cb
KK		 933 ni_lock(ni);
934 err = ni_new_attr_flags(ni, new_fa);
935 ni_unlock(ni);
936 if (err)
937 goto out;
938 }
939set_new_fa:
940 /*
941 * Thanks Mark Harmstone:
e8b8e97f 942 * Keep directory bit consistency.
be71b5cb
KK		 943 */
944 if (S_ISDIR(inode->i_mode))
945 new_fa |= FILE_ATTRIBUTE_DIRECTORY;
946 else
947 new_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
948
949 if (ni->std_fa != new_fa) {
950 ni->std_fa = new_fa;
951 if (new_fa & FILE_ATTRIBUTE_READONLY)
952 inode->i_mode &= ~0222;
953 else
954 inode->i_mode |= 0222;
e8b8e97f 955 /* Std attribute always in primary record. */
be71b5cb
KK		 956 ni->mi.dirty = true;
957 mark_inode_dirty(inode);
958 }
959 err = 0;
960
961 goto out;
962 }
963
964 if (name_len == sizeof(SYSTEM_NTFS_SECURITY) - 1 &&
965 !memcmp(name, SYSTEM_NTFS_SECURITY, sizeof(SYSTEM_NTFS_SECURITY))) {
966 /* system.ntfs_security*/
967 __le32 security_id;
968 bool inserted;
969 struct ATTR_STD_INFO5 *std;
970
971 if (!is_ntfs3(ni->mi.sbi)) {
972 /*
e8b8e97f
KA		 973 * We should replace ATTR_SECURE.
974 * Skip this way cause it is nt4 feature.
be71b5cb
KK		 975 */
976 err = -EINVAL;
977 goto out;
978 }
979
980 if (!is_sd_valid(value, size)) {
981 err = -EINVAL;
982 ntfs_inode_warn(
983 inode,
984 "you try to set invalid security descriptor");
985 goto out;
986 }
987
988 err = ntfs_insert_security(ni->mi.sbi, value, size,
989 &security_id, &inserted);
990 if (err)
991 goto out;
992
993 ni_lock(ni);
994 std = ni_std5(ni);
995 if (!std) {
996 err = -EINVAL;
997 } else if (std->security_id != security_id) {
998 std->security_id = ni->std_security_id = security_id;
e8b8e97f 999 /* Std attribute always in primary record. */
be71b5cb
KK		 1000 ni->mi.dirty = true;
1001 mark_inode_dirty(&ni->vfs_inode);
1002 }
1003 ni_unlock(ni);
1004 goto out;
1005 }
1006
1007#ifdef CONFIG_NTFS3_FS_POSIX_ACL
1008 if ((name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1 &&
1009 !memcmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1010 sizeof(XATTR_NAME_POSIX_ACL_ACCESS))) ||
1011 (name_len == sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1 &&
1012 !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1013 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
1014 err = ntfs_xattr_set_acl(
1015 mnt_userns, inode,
1016 name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
1017 ? ACL_TYPE_ACCESS
1018 : ACL_TYPE_DEFAULT,
1019 value, size);
1020 goto out;
1021 }
1022#endif
e8b8e97f 1023 /* Deal with NTFS extended attribute. */
be71b5cb
KK		 1024 err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
1025
1026out:
1027 return err;
1028}
1029
1030/*
1031 * ntfs_save_wsl_perm
1032 *
1033 * save uid/gid/mode in xattr
1034 */
1035int ntfs_save_wsl_perm(struct inode *inode)
1036{
1037 int err;
1038 __le32 value;
1039
1040 value = cpu_to_le32(i_uid_read(inode));
1041 err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
1042 sizeof(value), 0, 0);
1043 if (err)
1044 goto out;
1045
1046 value = cpu_to_le32(i_gid_read(inode));
1047 err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
1048 sizeof(value), 0, 0);
1049 if (err)
1050 goto out;
1051
1052 value = cpu_to_le32(inode->i_mode);
1053 err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
1054 sizeof(value), 0, 0);
1055 if (err)
1056 goto out;
1057
1058 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1059 value = cpu_to_le32(inode->i_rdev);
1060 err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
1061 sizeof(value), 0, 0);
1062 if (err)
1063 goto out;
1064 }
1065
1066out:
1067 /* In case of error should we delete all WSL xattr? */
1068 return err;
1069}
1070
1071/*
1072 * ntfs_get_wsl_perm
1073 *
1074 * get uid/gid/mode from xattr
1075 * it is called from ntfs_iget5->ntfs_read_mft
1076 */
1077void ntfs_get_wsl_perm(struct inode *inode)
1078{
1079 size_t sz;
1080 __le32 value[3];
1081
1082 if (ntfs_get_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value[0],
1083 sizeof(value[0]), &sz) == sizeof(value[0]) &&
1084 ntfs_get_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value[1],
1085 sizeof(value[1]), &sz) == sizeof(value[1]) &&
1086 ntfs_get_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value[2],
1087 sizeof(value[2]), &sz) == sizeof(value[2])) {
1088 i_uid_write(inode, (uid_t)le32_to_cpu(value[0]));
1089 i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
1090 inode->i_mode = le32_to_cpu(value[2]);
1091
1092 if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
1093 &value[0], sizeof(value),
1094 &sz) == sizeof(value[0])) {
1095 inode->i_rdev = le32_to_cpu(value[0]);
1096 }
1097 }
1098}
1099
1100static bool ntfs_xattr_user_list(struct dentry *dentry)
1101{
1102 return true;
1103}
1104
1105// clang-format off
1106static const struct xattr_handler ntfs_xattr_handler = {
1107 .prefix = "",
1108 .get = ntfs_getxattr,
1109 .set = ntfs_setxattr,
1110 .list = ntfs_xattr_user_list,
1111};
1112
1113const struct xattr_handler *ntfs_xattr_handlers[] = {
1114 &ntfs_xattr_handler,
1115 NULL,
1116};
1117// clang-format on
Ubuntu combined Linux kernel mirror