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Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5c8ebd57 | 2 | * Copyright (C) 2002,2003 by Andreas Gruenbacher <a.gruenbacher@computer.org> |
1da177e4 | 3 | * |
5c8ebd57 CH |
4 | * Fixes from William Schumacher incorporated on 15 March 2001. |
5 | * (Reported by Charles Bertsch, <CBertsch@microtest.com>). | |
1da177e4 LT |
6 | */ |
7 | ||
8 | /* | |
9 | * This file contains generic functions for manipulating | |
10 | * POSIX 1003.1e draft standard 17 ACLs. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/slab.h> | |
60063497 | 15 | #include <linux/atomic.h> |
1da177e4 LT |
16 | #include <linux/fs.h> |
17 | #include <linux/sched.h> | |
18 | #include <linux/posix_acl.h> | |
5c8ebd57 | 19 | #include <linux/posix_acl_xattr.h> |
630d9c47 | 20 | #include <linux/export.h> |
5c8ebd57 | 21 | #include <linux/user_namespace.h> |
1da177e4 | 22 | |
f61f6da0 | 23 | EXPORT_SYMBOL(posix_acl_init); |
1da177e4 | 24 | EXPORT_SYMBOL(posix_acl_alloc); |
1da177e4 LT |
25 | EXPORT_SYMBOL(posix_acl_valid); |
26 | EXPORT_SYMBOL(posix_acl_equiv_mode); | |
27 | EXPORT_SYMBOL(posix_acl_from_mode); | |
1da177e4 | 28 | |
2982baa2 CH |
29 | struct posix_acl *get_acl(struct inode *inode, int type) |
30 | { | |
31 | struct posix_acl *acl; | |
32 | ||
33 | acl = get_cached_acl(inode, type); | |
34 | if (acl != ACL_NOT_CACHED) | |
35 | return acl; | |
36 | ||
37 | if (!IS_POSIXACL(inode)) | |
38 | return NULL; | |
39 | ||
40 | /* | |
41 | * A filesystem can force a ACL callback by just never filling the | |
42 | * ACL cache. But normally you'd fill the cache either at inode | |
43 | * instantiation time, or on the first ->get_acl call. | |
44 | * | |
45 | * If the filesystem doesn't have a get_acl() function at all, we'll | |
46 | * just create the negative cache entry. | |
47 | */ | |
48 | if (!inode->i_op->get_acl) { | |
49 | set_cached_acl(inode, type, NULL); | |
50 | return NULL; | |
51 | } | |
52 | return inode->i_op->get_acl(inode, type); | |
53 | } | |
54 | EXPORT_SYMBOL(get_acl); | |
55 | ||
f61f6da0 CL |
56 | /* |
57 | * Init a fresh posix_acl | |
58 | */ | |
59 | void | |
60 | posix_acl_init(struct posix_acl *acl, int count) | |
61 | { | |
62 | atomic_set(&acl->a_refcount, 1); | |
63 | acl->a_count = count; | |
64 | } | |
65 | ||
1da177e4 LT |
66 | /* |
67 | * Allocate a new ACL with the specified number of entries. | |
68 | */ | |
69 | struct posix_acl * | |
dd0fc66f | 70 | posix_acl_alloc(int count, gfp_t flags) |
1da177e4 LT |
71 | { |
72 | const size_t size = sizeof(struct posix_acl) + | |
73 | count * sizeof(struct posix_acl_entry); | |
74 | struct posix_acl *acl = kmalloc(size, flags); | |
f61f6da0 CL |
75 | if (acl) |
76 | posix_acl_init(acl, count); | |
1da177e4 LT |
77 | return acl; |
78 | } | |
79 | ||
80 | /* | |
81 | * Clone an ACL. | |
82 | */ | |
edde854e | 83 | static struct posix_acl * |
dd0fc66f | 84 | posix_acl_clone(const struct posix_acl *acl, gfp_t flags) |
1da177e4 LT |
85 | { |
86 | struct posix_acl *clone = NULL; | |
87 | ||
88 | if (acl) { | |
89 | int size = sizeof(struct posix_acl) + acl->a_count * | |
90 | sizeof(struct posix_acl_entry); | |
52978be6 AD |
91 | clone = kmemdup(acl, size, flags); |
92 | if (clone) | |
1da177e4 | 93 | atomic_set(&clone->a_refcount, 1); |
1da177e4 LT |
94 | } |
95 | return clone; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Check if an acl is valid. Returns 0 if it is, or -E... otherwise. | |
100 | */ | |
101 | int | |
102 | posix_acl_valid(const struct posix_acl *acl) | |
103 | { | |
104 | const struct posix_acl_entry *pa, *pe; | |
105 | int state = ACL_USER_OBJ; | |
2f6f0654 EB |
106 | kuid_t prev_uid = INVALID_UID; |
107 | kgid_t prev_gid = INVALID_GID; | |
1da177e4 LT |
108 | int needs_mask = 0; |
109 | ||
110 | FOREACH_ACL_ENTRY(pa, acl, pe) { | |
111 | if (pa->e_perm & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE)) | |
112 | return -EINVAL; | |
113 | switch (pa->e_tag) { | |
114 | case ACL_USER_OBJ: | |
115 | if (state == ACL_USER_OBJ) { | |
1da177e4 LT |
116 | state = ACL_USER; |
117 | break; | |
118 | } | |
119 | return -EINVAL; | |
120 | ||
121 | case ACL_USER: | |
122 | if (state != ACL_USER) | |
123 | return -EINVAL; | |
2f6f0654 | 124 | if (!uid_valid(pa->e_uid)) |
1da177e4 | 125 | return -EINVAL; |
2f6f0654 EB |
126 | if (uid_valid(prev_uid) && |
127 | uid_lte(pa->e_uid, prev_uid)) | |
128 | return -EINVAL; | |
129 | prev_uid = pa->e_uid; | |
1da177e4 LT |
130 | needs_mask = 1; |
131 | break; | |
132 | ||
133 | case ACL_GROUP_OBJ: | |
134 | if (state == ACL_USER) { | |
1da177e4 LT |
135 | state = ACL_GROUP; |
136 | break; | |
137 | } | |
138 | return -EINVAL; | |
139 | ||
140 | case ACL_GROUP: | |
141 | if (state != ACL_GROUP) | |
142 | return -EINVAL; | |
2f6f0654 EB |
143 | if (!gid_valid(pa->e_gid)) |
144 | return -EINVAL; | |
145 | if (gid_valid(prev_gid) && | |
146 | gid_lte(pa->e_gid, prev_gid)) | |
1da177e4 | 147 | return -EINVAL; |
2f6f0654 | 148 | prev_gid = pa->e_gid; |
1da177e4 LT |
149 | needs_mask = 1; |
150 | break; | |
151 | ||
152 | case ACL_MASK: | |
153 | if (state != ACL_GROUP) | |
154 | return -EINVAL; | |
155 | state = ACL_OTHER; | |
156 | break; | |
157 | ||
158 | case ACL_OTHER: | |
159 | if (state == ACL_OTHER || | |
160 | (state == ACL_GROUP && !needs_mask)) { | |
161 | state = 0; | |
162 | break; | |
163 | } | |
164 | return -EINVAL; | |
165 | ||
166 | default: | |
167 | return -EINVAL; | |
168 | } | |
169 | } | |
170 | if (state == 0) | |
171 | return 0; | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Returns 0 if the acl can be exactly represented in the traditional | |
177 | * file mode permission bits, or else 1. Returns -E... on error. | |
178 | */ | |
179 | int | |
d6952123 | 180 | posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p) |
1da177e4 LT |
181 | { |
182 | const struct posix_acl_entry *pa, *pe; | |
d6952123 | 183 | umode_t mode = 0; |
1da177e4 LT |
184 | int not_equiv = 0; |
185 | ||
186 | FOREACH_ACL_ENTRY(pa, acl, pe) { | |
187 | switch (pa->e_tag) { | |
188 | case ACL_USER_OBJ: | |
189 | mode |= (pa->e_perm & S_IRWXO) << 6; | |
190 | break; | |
191 | case ACL_GROUP_OBJ: | |
192 | mode |= (pa->e_perm & S_IRWXO) << 3; | |
193 | break; | |
194 | case ACL_OTHER: | |
195 | mode |= pa->e_perm & S_IRWXO; | |
196 | break; | |
197 | case ACL_MASK: | |
198 | mode = (mode & ~S_IRWXG) | | |
199 | ((pa->e_perm & S_IRWXO) << 3); | |
200 | not_equiv = 1; | |
201 | break; | |
202 | case ACL_USER: | |
203 | case ACL_GROUP: | |
204 | not_equiv = 1; | |
205 | break; | |
206 | default: | |
207 | return -EINVAL; | |
208 | } | |
209 | } | |
210 | if (mode_p) | |
211 | *mode_p = (*mode_p & ~S_IRWXUGO) | mode; | |
212 | return not_equiv; | |
213 | } | |
214 | ||
215 | /* | |
216 | * Create an ACL representing the file mode permission bits of an inode. | |
217 | */ | |
218 | struct posix_acl * | |
3a5fba19 | 219 | posix_acl_from_mode(umode_t mode, gfp_t flags) |
1da177e4 LT |
220 | { |
221 | struct posix_acl *acl = posix_acl_alloc(3, flags); | |
222 | if (!acl) | |
223 | return ERR_PTR(-ENOMEM); | |
224 | ||
225 | acl->a_entries[0].e_tag = ACL_USER_OBJ; | |
1da177e4 LT |
226 | acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6; |
227 | ||
228 | acl->a_entries[1].e_tag = ACL_GROUP_OBJ; | |
1da177e4 LT |
229 | acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3; |
230 | ||
231 | acl->a_entries[2].e_tag = ACL_OTHER; | |
1da177e4 LT |
232 | acl->a_entries[2].e_perm = (mode & S_IRWXO); |
233 | return acl; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Return 0 if current is granted want access to the inode | |
238 | * by the acl. Returns -E... otherwise. | |
239 | */ | |
240 | int | |
241 | posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want) | |
242 | { | |
243 | const struct posix_acl_entry *pa, *pe, *mask_obj; | |
244 | int found = 0; | |
245 | ||
d124b60a AG |
246 | want &= MAY_READ | MAY_WRITE | MAY_EXEC | MAY_NOT_BLOCK; |
247 | ||
1da177e4 LT |
248 | FOREACH_ACL_ENTRY(pa, acl, pe) { |
249 | switch(pa->e_tag) { | |
250 | case ACL_USER_OBJ: | |
251 | /* (May have been checked already) */ | |
2f6f0654 | 252 | if (uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
253 | goto check_perm; |
254 | break; | |
255 | case ACL_USER: | |
2f6f0654 | 256 | if (uid_eq(pa->e_uid, current_fsuid())) |
1da177e4 LT |
257 | goto mask; |
258 | break; | |
259 | case ACL_GROUP_OBJ: | |
260 | if (in_group_p(inode->i_gid)) { | |
261 | found = 1; | |
262 | if ((pa->e_perm & want) == want) | |
263 | goto mask; | |
264 | } | |
265 | break; | |
266 | case ACL_GROUP: | |
2f6f0654 | 267 | if (in_group_p(pa->e_gid)) { |
1da177e4 LT |
268 | found = 1; |
269 | if ((pa->e_perm & want) == want) | |
270 | goto mask; | |
271 | } | |
272 | break; | |
273 | case ACL_MASK: | |
274 | break; | |
275 | case ACL_OTHER: | |
276 | if (found) | |
277 | return -EACCES; | |
278 | else | |
279 | goto check_perm; | |
280 | default: | |
281 | return -EIO; | |
282 | } | |
283 | } | |
284 | return -EIO; | |
285 | ||
286 | mask: | |
287 | for (mask_obj = pa+1; mask_obj != pe; mask_obj++) { | |
288 | if (mask_obj->e_tag == ACL_MASK) { | |
289 | if ((pa->e_perm & mask_obj->e_perm & want) == want) | |
290 | return 0; | |
291 | return -EACCES; | |
292 | } | |
293 | } | |
294 | ||
295 | check_perm: | |
296 | if ((pa->e_perm & want) == want) | |
297 | return 0; | |
298 | return -EACCES; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Modify acl when creating a new inode. The caller must ensure the acl is | |
303 | * only referenced once. | |
304 | * | |
305 | * mode_p initially must contain the mode parameter to the open() / creat() | |
306 | * system calls. All permissions that are not granted by the acl are removed. | |
307 | * The permissions in the acl are changed to reflect the mode_p parameter. | |
308 | */ | |
d3fb6120 | 309 | static int posix_acl_create_masq(struct posix_acl *acl, umode_t *mode_p) |
1da177e4 LT |
310 | { |
311 | struct posix_acl_entry *pa, *pe; | |
312 | struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; | |
d3fb6120 | 313 | umode_t mode = *mode_p; |
1da177e4 LT |
314 | int not_equiv = 0; |
315 | ||
316 | /* assert(atomic_read(acl->a_refcount) == 1); */ | |
317 | ||
318 | FOREACH_ACL_ENTRY(pa, acl, pe) { | |
319 | switch(pa->e_tag) { | |
320 | case ACL_USER_OBJ: | |
321 | pa->e_perm &= (mode >> 6) | ~S_IRWXO; | |
322 | mode &= (pa->e_perm << 6) | ~S_IRWXU; | |
323 | break; | |
324 | ||
325 | case ACL_USER: | |
326 | case ACL_GROUP: | |
327 | not_equiv = 1; | |
328 | break; | |
329 | ||
330 | case ACL_GROUP_OBJ: | |
331 | group_obj = pa; | |
332 | break; | |
333 | ||
334 | case ACL_OTHER: | |
335 | pa->e_perm &= mode | ~S_IRWXO; | |
336 | mode &= pa->e_perm | ~S_IRWXO; | |
337 | break; | |
338 | ||
339 | case ACL_MASK: | |
340 | mask_obj = pa; | |
341 | not_equiv = 1; | |
342 | break; | |
343 | ||
344 | default: | |
345 | return -EIO; | |
346 | } | |
347 | } | |
348 | ||
349 | if (mask_obj) { | |
350 | mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO; | |
351 | mode &= (mask_obj->e_perm << 3) | ~S_IRWXG; | |
352 | } else { | |
353 | if (!group_obj) | |
354 | return -EIO; | |
355 | group_obj->e_perm &= (mode >> 3) | ~S_IRWXO; | |
356 | mode &= (group_obj->e_perm << 3) | ~S_IRWXG; | |
357 | } | |
358 | ||
359 | *mode_p = (*mode_p & ~S_IRWXUGO) | mode; | |
360 | return not_equiv; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Modify the ACL for the chmod syscall. | |
365 | */ | |
86bc704d | 366 | static int posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode) |
1da177e4 LT |
367 | { |
368 | struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; | |
369 | struct posix_acl_entry *pa, *pe; | |
370 | ||
371 | /* assert(atomic_read(acl->a_refcount) == 1); */ | |
372 | ||
373 | FOREACH_ACL_ENTRY(pa, acl, pe) { | |
374 | switch(pa->e_tag) { | |
375 | case ACL_USER_OBJ: | |
376 | pa->e_perm = (mode & S_IRWXU) >> 6; | |
377 | break; | |
378 | ||
379 | case ACL_USER: | |
380 | case ACL_GROUP: | |
381 | break; | |
382 | ||
383 | case ACL_GROUP_OBJ: | |
384 | group_obj = pa; | |
385 | break; | |
386 | ||
387 | case ACL_MASK: | |
388 | mask_obj = pa; | |
389 | break; | |
390 | ||
391 | case ACL_OTHER: | |
392 | pa->e_perm = (mode & S_IRWXO); | |
393 | break; | |
394 | ||
395 | default: | |
396 | return -EIO; | |
397 | } | |
398 | } | |
399 | ||
400 | if (mask_obj) { | |
401 | mask_obj->e_perm = (mode & S_IRWXG) >> 3; | |
402 | } else { | |
403 | if (!group_obj) | |
404 | return -EIO; | |
405 | group_obj->e_perm = (mode & S_IRWXG) >> 3; | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
bc26ab5f | 410 | |
826cae2f | 411 | int |
d3fb6120 | 412 | posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p) |
826cae2f AV |
413 | { |
414 | struct posix_acl *clone = posix_acl_clone(*acl, gfp); | |
415 | int err = -ENOMEM; | |
416 | if (clone) { | |
417 | err = posix_acl_create_masq(clone, mode_p); | |
418 | if (err < 0) { | |
419 | posix_acl_release(clone); | |
420 | clone = NULL; | |
421 | } | |
422 | } | |
423 | posix_acl_release(*acl); | |
424 | *acl = clone; | |
425 | return err; | |
426 | } | |
427 | EXPORT_SYMBOL(posix_acl_create); | |
428 | ||
bc26ab5f | 429 | int |
86bc704d | 430 | posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode) |
bc26ab5f AV |
431 | { |
432 | struct posix_acl *clone = posix_acl_clone(*acl, gfp); | |
433 | int err = -ENOMEM; | |
434 | if (clone) { | |
435 | err = posix_acl_chmod_masq(clone, mode); | |
436 | if (err) { | |
437 | posix_acl_release(clone); | |
438 | clone = NULL; | |
439 | } | |
440 | } | |
441 | posix_acl_release(*acl); | |
442 | *acl = clone; | |
443 | return err; | |
444 | } | |
445 | EXPORT_SYMBOL(posix_acl_chmod); | |
5c8ebd57 CH |
446 | |
447 | /* | |
448 | * Fix up the uids and gids in posix acl extended attributes in place. | |
449 | */ | |
450 | static void posix_acl_fix_xattr_userns( | |
451 | struct user_namespace *to, struct user_namespace *from, | |
452 | void *value, size_t size) | |
453 | { | |
454 | posix_acl_xattr_header *header = (posix_acl_xattr_header *)value; | |
455 | posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end; | |
456 | int count; | |
457 | kuid_t uid; | |
458 | kgid_t gid; | |
459 | ||
460 | if (!value) | |
461 | return; | |
462 | if (size < sizeof(posix_acl_xattr_header)) | |
463 | return; | |
464 | if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) | |
465 | return; | |
466 | ||
467 | count = posix_acl_xattr_count(size); | |
468 | if (count < 0) | |
469 | return; | |
470 | if (count == 0) | |
471 | return; | |
472 | ||
473 | for (end = entry + count; entry != end; entry++) { | |
474 | switch(le16_to_cpu(entry->e_tag)) { | |
475 | case ACL_USER: | |
476 | uid = make_kuid(from, le32_to_cpu(entry->e_id)); | |
477 | entry->e_id = cpu_to_le32(from_kuid(to, uid)); | |
478 | break; | |
479 | case ACL_GROUP: | |
480 | gid = make_kgid(from, le32_to_cpu(entry->e_id)); | |
481 | entry->e_id = cpu_to_le32(from_kgid(to, gid)); | |
482 | break; | |
483 | default: | |
484 | break; | |
485 | } | |
486 | } | |
487 | } | |
488 | ||
489 | void posix_acl_fix_xattr_from_user(void *value, size_t size) | |
490 | { | |
491 | struct user_namespace *user_ns = current_user_ns(); | |
492 | if (user_ns == &init_user_ns) | |
493 | return; | |
494 | posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size); | |
495 | } | |
496 | ||
497 | void posix_acl_fix_xattr_to_user(void *value, size_t size) | |
498 | { | |
499 | struct user_namespace *user_ns = current_user_ns(); | |
500 | if (user_ns == &init_user_ns) | |
501 | return; | |
502 | posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size); | |
503 | } | |
504 | ||
505 | /* | |
506 | * Convert from extended attribute to in-memory representation. | |
507 | */ | |
508 | struct posix_acl * | |
509 | posix_acl_from_xattr(struct user_namespace *user_ns, | |
510 | const void *value, size_t size) | |
511 | { | |
512 | posix_acl_xattr_header *header = (posix_acl_xattr_header *)value; | |
513 | posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end; | |
514 | int count; | |
515 | struct posix_acl *acl; | |
516 | struct posix_acl_entry *acl_e; | |
517 | ||
518 | if (!value) | |
519 | return NULL; | |
520 | if (size < sizeof(posix_acl_xattr_header)) | |
521 | return ERR_PTR(-EINVAL); | |
522 | if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) | |
523 | return ERR_PTR(-EOPNOTSUPP); | |
524 | ||
525 | count = posix_acl_xattr_count(size); | |
526 | if (count < 0) | |
527 | return ERR_PTR(-EINVAL); | |
528 | if (count == 0) | |
529 | return NULL; | |
530 | ||
531 | acl = posix_acl_alloc(count, GFP_NOFS); | |
532 | if (!acl) | |
533 | return ERR_PTR(-ENOMEM); | |
534 | acl_e = acl->a_entries; | |
535 | ||
536 | for (end = entry + count; entry != end; acl_e++, entry++) { | |
537 | acl_e->e_tag = le16_to_cpu(entry->e_tag); | |
538 | acl_e->e_perm = le16_to_cpu(entry->e_perm); | |
539 | ||
540 | switch(acl_e->e_tag) { | |
541 | case ACL_USER_OBJ: | |
542 | case ACL_GROUP_OBJ: | |
543 | case ACL_MASK: | |
544 | case ACL_OTHER: | |
545 | break; | |
546 | ||
547 | case ACL_USER: | |
548 | acl_e->e_uid = | |
549 | make_kuid(user_ns, | |
550 | le32_to_cpu(entry->e_id)); | |
551 | if (!uid_valid(acl_e->e_uid)) | |
552 | goto fail; | |
553 | break; | |
554 | case ACL_GROUP: | |
555 | acl_e->e_gid = | |
556 | make_kgid(user_ns, | |
557 | le32_to_cpu(entry->e_id)); | |
558 | if (!gid_valid(acl_e->e_gid)) | |
559 | goto fail; | |
560 | break; | |
561 | ||
562 | default: | |
563 | goto fail; | |
564 | } | |
565 | } | |
566 | return acl; | |
567 | ||
568 | fail: | |
569 | posix_acl_release(acl); | |
570 | return ERR_PTR(-EINVAL); | |
571 | } | |
572 | EXPORT_SYMBOL (posix_acl_from_xattr); | |
573 | ||
574 | /* | |
575 | * Convert from in-memory to extended attribute representation. | |
576 | */ | |
577 | int | |
578 | posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl, | |
579 | void *buffer, size_t size) | |
580 | { | |
581 | posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer; | |
582 | posix_acl_xattr_entry *ext_entry = ext_acl->a_entries; | |
583 | int real_size, n; | |
584 | ||
585 | real_size = posix_acl_xattr_size(acl->a_count); | |
586 | if (!buffer) | |
587 | return real_size; | |
588 | if (real_size > size) | |
589 | return -ERANGE; | |
590 | ||
591 | ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION); | |
592 | ||
593 | for (n=0; n < acl->a_count; n++, ext_entry++) { | |
594 | const struct posix_acl_entry *acl_e = &acl->a_entries[n]; | |
595 | ext_entry->e_tag = cpu_to_le16(acl_e->e_tag); | |
596 | ext_entry->e_perm = cpu_to_le16(acl_e->e_perm); | |
597 | switch(acl_e->e_tag) { | |
598 | case ACL_USER: | |
599 | ext_entry->e_id = | |
600 | cpu_to_le32(from_kuid(user_ns, acl_e->e_uid)); | |
601 | break; | |
602 | case ACL_GROUP: | |
603 | ext_entry->e_id = | |
604 | cpu_to_le32(from_kgid(user_ns, acl_e->e_gid)); | |
605 | break; | |
606 | default: | |
607 | ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); | |
608 | break; | |
609 | } | |
610 | } | |
611 | return real_size; | |
612 | } | |
613 | EXPORT_SYMBOL (posix_acl_to_xattr); |