Blame view
fs/posix_acl.c
19.9 KB
1da177e4c Linux-2.6.12-rc2 |
1 |
/* |
5c8ebd57b fs: merge xattr_a... |
2 |
* Copyright (C) 2002,2003 by Andreas Gruenbacher <a.gruenbacher@computer.org> |
1da177e4c Linux-2.6.12-rc2 |
3 |
* |
5c8ebd57b fs: merge xattr_a... |
4 5 |
* Fixes from William Schumacher incorporated on 15 March 2001. * (Reported by Charles Bertsch, <CBertsch@microtest.com>). |
1da177e4c Linux-2.6.12-rc2 |
6 7 8 9 10 11 12 13 14 |
*/ /* * This file contains generic functions for manipulating * POSIX 1003.1e draft standard 17 ACLs. */ #include <linux/kernel.h> #include <linux/slab.h> |
60063497a atomic: use <linu... |
15 |
#include <linux/atomic.h> |
1da177e4c Linux-2.6.12-rc2 |
16 17 18 |
#include <linux/fs.h> #include <linux/sched.h> #include <linux/posix_acl.h> |
5c8ebd57b fs: merge xattr_a... |
19 |
#include <linux/posix_acl_xattr.h> |
2aeccbe95 fs: add generic x... |
20 |
#include <linux/xattr.h> |
630d9c472 fs: reduce the us... |
21 |
#include <linux/export.h> |
5c8ebd57b fs: merge xattr_a... |
22 |
#include <linux/user_namespace.h> |
1da177e4c Linux-2.6.12-rc2 |
23 |
|
0afaa1204 posix_acl: uninli... |
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 |
struct posix_acl **acl_by_type(struct inode *inode, int type) { switch (type) { case ACL_TYPE_ACCESS: return &inode->i_acl; case ACL_TYPE_DEFAULT: return &inode->i_default_acl; default: BUG(); } } EXPORT_SYMBOL(acl_by_type); struct posix_acl *get_cached_acl(struct inode *inode, int type) { struct posix_acl **p = acl_by_type(inode, type); struct posix_acl *acl = ACCESS_ONCE(*p); if (acl) { spin_lock(&inode->i_lock); acl = *p; if (acl != ACL_NOT_CACHED) acl = posix_acl_dup(acl); spin_unlock(&inode->i_lock); } return acl; } EXPORT_SYMBOL(get_cached_acl); struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type) { return rcu_dereference(*acl_by_type(inode, type)); } EXPORT_SYMBOL(get_cached_acl_rcu); void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl) { struct posix_acl **p = acl_by_type(inode, type); struct posix_acl *old; spin_lock(&inode->i_lock); old = *p; rcu_assign_pointer(*p, posix_acl_dup(acl)); spin_unlock(&inode->i_lock); if (old != ACL_NOT_CACHED) posix_acl_release(old); } EXPORT_SYMBOL(set_cached_acl); void forget_cached_acl(struct inode *inode, int type) { struct posix_acl **p = acl_by_type(inode, type); struct posix_acl *old; spin_lock(&inode->i_lock); old = *p; *p = ACL_NOT_CACHED; spin_unlock(&inode->i_lock); if (old != ACL_NOT_CACHED) posix_acl_release(old); } EXPORT_SYMBOL(forget_cached_acl); void forget_all_cached_acls(struct inode *inode) { struct posix_acl *old_access, *old_default; spin_lock(&inode->i_lock); old_access = inode->i_acl; old_default = inode->i_default_acl; inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED; spin_unlock(&inode->i_lock); if (old_access != ACL_NOT_CACHED) posix_acl_release(old_access); if (old_default != ACL_NOT_CACHED) posix_acl_release(old_default); } EXPORT_SYMBOL(forget_all_cached_acls); |
1da177e4c Linux-2.6.12-rc2 |
98 |
|
2982baa2a fs: add get_acl h... |
99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 |
struct posix_acl *get_acl(struct inode *inode, int type) { struct posix_acl *acl; acl = get_cached_acl(inode, type); if (acl != ACL_NOT_CACHED) return acl; if (!IS_POSIXACL(inode)) return NULL; /* * A filesystem can force a ACL callback by just never filling the * ACL cache. But normally you'd fill the cache either at inode * instantiation time, or on the first ->get_acl call. * * If the filesystem doesn't have a get_acl() function at all, we'll * just create the negative cache entry. */ if (!inode->i_op->get_acl) { set_cached_acl(inode, type, NULL); return NULL; } return inode->i_op->get_acl(inode, type); } EXPORT_SYMBOL(get_acl); |
1da177e4c Linux-2.6.12-rc2 |
125 |
/* |
f61f6da0d NFS: Prevent memo... |
126 127 128 129 130 131 132 133 |
* Init a fresh posix_acl */ void posix_acl_init(struct posix_acl *acl, int count) { atomic_set(&acl->a_refcount, 1); acl->a_count = count; } |
0afaa1204 posix_acl: uninli... |
134 |
EXPORT_SYMBOL(posix_acl_init); |
f61f6da0d NFS: Prevent memo... |
135 136 |
/* |
1da177e4c Linux-2.6.12-rc2 |
137 138 139 |
* Allocate a new ACL with the specified number of entries. */ struct posix_acl * |
dd0fc66fb [PATCH] gfp flags... |
140 |
posix_acl_alloc(int count, gfp_t flags) |
1da177e4c Linux-2.6.12-rc2 |
141 142 143 144 |
{ const size_t size = sizeof(struct posix_acl) + count * sizeof(struct posix_acl_entry); struct posix_acl *acl = kmalloc(size, flags); |
f61f6da0d NFS: Prevent memo... |
145 146 |
if (acl) posix_acl_init(acl, count); |
1da177e4c Linux-2.6.12-rc2 |
147 148 |
return acl; } |
0afaa1204 posix_acl: uninli... |
149 |
EXPORT_SYMBOL(posix_acl_alloc); |
1da177e4c Linux-2.6.12-rc2 |
150 151 152 153 |
/* * Clone an ACL. */ |
edde854e8 bury posix_acl_..... |
154 |
static struct posix_acl * |
dd0fc66fb [PATCH] gfp flags... |
155 |
posix_acl_clone(const struct posix_acl *acl, gfp_t flags) |
1da177e4c Linux-2.6.12-rc2 |
156 157 158 159 160 161 |
{ struct posix_acl *clone = NULL; if (acl) { int size = sizeof(struct posix_acl) + acl->a_count * sizeof(struct posix_acl_entry); |
52978be63 [PATCH] kmemdup: ... |
162 163 |
clone = kmemdup(acl, size, flags); if (clone) |
1da177e4c Linux-2.6.12-rc2 |
164 |
atomic_set(&clone->a_refcount, 1); |
1da177e4c Linux-2.6.12-rc2 |
165 166 167 168 169 170 171 172 173 174 175 176 |
} return clone; } /* * Check if an acl is valid. Returns 0 if it is, or -E... otherwise. */ int posix_acl_valid(const struct posix_acl *acl) { const struct posix_acl_entry *pa, *pe; int state = ACL_USER_OBJ; |
1da177e4c Linux-2.6.12-rc2 |
177 178 179 180 181 182 183 184 |
int needs_mask = 0; FOREACH_ACL_ENTRY(pa, acl, pe) { if (pa->e_perm & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE)) return -EINVAL; switch (pa->e_tag) { case ACL_USER_OBJ: if (state == ACL_USER_OBJ) { |
1da177e4c Linux-2.6.12-rc2 |
185 186 187 188 189 190 191 192 |
state = ACL_USER; break; } return -EINVAL; case ACL_USER: if (state != ACL_USER) return -EINVAL; |
2f6f0654a userns: Convert v... |
193 |
if (!uid_valid(pa->e_uid)) |
1da177e4c Linux-2.6.12-rc2 |
194 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
195 196 197 198 199 |
needs_mask = 1; break; case ACL_GROUP_OBJ: if (state == ACL_USER) { |
1da177e4c Linux-2.6.12-rc2 |
200 201 202 203 204 205 206 207 |
state = ACL_GROUP; break; } return -EINVAL; case ACL_GROUP: if (state != ACL_GROUP) return -EINVAL; |
2f6f0654a userns: Convert v... |
208 209 |
if (!gid_valid(pa->e_gid)) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 |
needs_mask = 1; break; case ACL_MASK: if (state != ACL_GROUP) return -EINVAL; state = ACL_OTHER; break; case ACL_OTHER: if (state == ACL_OTHER || (state == ACL_GROUP && !needs_mask)) { state = 0; break; } return -EINVAL; default: return -EINVAL; } } if (state == 0) return 0; return -EINVAL; } |
0afaa1204 posix_acl: uninli... |
235 |
EXPORT_SYMBOL(posix_acl_valid); |
1da177e4c Linux-2.6.12-rc2 |
236 237 238 239 240 241 |
/* * Returns 0 if the acl can be exactly represented in the traditional * file mode permission bits, or else 1. Returns -E... on error. */ int |
d6952123b switch posix_acl_... |
242 |
posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p) |
1da177e4c Linux-2.6.12-rc2 |
243 244 |
{ const struct posix_acl_entry *pa, *pe; |
d6952123b switch posix_acl_... |
245 |
umode_t mode = 0; |
1da177e4c Linux-2.6.12-rc2 |
246 |
int not_equiv = 0; |
50c6e282b posix_acl: handle... |
247 248 249 250 251 |
/* * A null ACL can always be presented as mode bits. */ if (!acl) return 0; |
1da177e4c Linux-2.6.12-rc2 |
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 |
FOREACH_ACL_ENTRY(pa, acl, pe) { switch (pa->e_tag) { case ACL_USER_OBJ: mode |= (pa->e_perm & S_IRWXO) << 6; break; case ACL_GROUP_OBJ: mode |= (pa->e_perm & S_IRWXO) << 3; break; case ACL_OTHER: mode |= pa->e_perm & S_IRWXO; break; case ACL_MASK: mode = (mode & ~S_IRWXG) | ((pa->e_perm & S_IRWXO) << 3); not_equiv = 1; break; case ACL_USER: case ACL_GROUP: not_equiv = 1; break; default: return -EINVAL; } } if (mode_p) *mode_p = (*mode_p & ~S_IRWXUGO) | mode; return not_equiv; } |
0afaa1204 posix_acl: uninli... |
280 |
EXPORT_SYMBOL(posix_acl_equiv_mode); |
1da177e4c Linux-2.6.12-rc2 |
281 282 283 284 285 |
/* * Create an ACL representing the file mode permission bits of an inode. */ struct posix_acl * |
3a5fba19b switch posix_acl_... |
286 |
posix_acl_from_mode(umode_t mode, gfp_t flags) |
1da177e4c Linux-2.6.12-rc2 |
287 288 289 290 291 292 |
{ struct posix_acl *acl = posix_acl_alloc(3, flags); if (!acl) return ERR_PTR(-ENOMEM); acl->a_entries[0].e_tag = ACL_USER_OBJ; |
1da177e4c Linux-2.6.12-rc2 |
293 294 295 |
acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6; acl->a_entries[1].e_tag = ACL_GROUP_OBJ; |
1da177e4c Linux-2.6.12-rc2 |
296 297 298 |
acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3; acl->a_entries[2].e_tag = ACL_OTHER; |
1da177e4c Linux-2.6.12-rc2 |
299 300 301 |
acl->a_entries[2].e_perm = (mode & S_IRWXO); return acl; } |
0afaa1204 posix_acl: uninli... |
302 |
EXPORT_SYMBOL(posix_acl_from_mode); |
1da177e4c Linux-2.6.12-rc2 |
303 304 305 306 307 308 309 310 311 312 |
/* * Return 0 if current is granted want access to the inode * by the acl. Returns -E... otherwise. */ int posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want) { const struct posix_acl_entry *pa, *pe, *mask_obj; int found = 0; |
d124b60a8 vfs: pass all mas... |
313 |
want &= MAY_READ | MAY_WRITE | MAY_EXEC | MAY_NOT_BLOCK; |
1da177e4c Linux-2.6.12-rc2 |
314 315 316 317 |
FOREACH_ACL_ENTRY(pa, acl, pe) { switch(pa->e_tag) { case ACL_USER_OBJ: /* (May have been checked already) */ |
2f6f0654a userns: Convert v... |
318 |
if (uid_eq(inode->i_uid, current_fsuid())) |
1da177e4c Linux-2.6.12-rc2 |
319 320 321 |
goto check_perm; break; case ACL_USER: |
2f6f0654a userns: Convert v... |
322 |
if (uid_eq(pa->e_uid, current_fsuid())) |
1da177e4c Linux-2.6.12-rc2 |
323 324 325 326 327 328 329 330 331 332 |
goto mask; break; case ACL_GROUP_OBJ: if (in_group_p(inode->i_gid)) { found = 1; if ((pa->e_perm & want) == want) goto mask; } break; case ACL_GROUP: |
2f6f0654a userns: Convert v... |
333 |
if (in_group_p(pa->e_gid)) { |
1da177e4c Linux-2.6.12-rc2 |
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 |
found = 1; if ((pa->e_perm & want) == want) goto mask; } break; case ACL_MASK: break; case ACL_OTHER: if (found) return -EACCES; else goto check_perm; default: return -EIO; } } return -EIO; mask: for (mask_obj = pa+1; mask_obj != pe; mask_obj++) { if (mask_obj->e_tag == ACL_MASK) { if ((pa->e_perm & mask_obj->e_perm & want) == want) return 0; return -EACCES; } } check_perm: if ((pa->e_perm & want) == want) return 0; return -EACCES; } /* * Modify acl when creating a new inode. The caller must ensure the acl is * only referenced once. * * mode_p initially must contain the mode parameter to the open() / creat() * system calls. All permissions that are not granted by the acl are removed. * The permissions in the acl are changed to reflect the mode_p parameter. */ |
d3fb61207 switch posix_acl_... |
375 |
static int posix_acl_create_masq(struct posix_acl *acl, umode_t *mode_p) |
1da177e4c Linux-2.6.12-rc2 |
376 377 378 |
{ struct posix_acl_entry *pa, *pe; struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; |
d3fb61207 switch posix_acl_... |
379 |
umode_t mode = *mode_p; |
1da177e4c Linux-2.6.12-rc2 |
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 |
int not_equiv = 0; /* assert(atomic_read(acl->a_refcount) == 1); */ FOREACH_ACL_ENTRY(pa, acl, pe) { switch(pa->e_tag) { case ACL_USER_OBJ: pa->e_perm &= (mode >> 6) | ~S_IRWXO; mode &= (pa->e_perm << 6) | ~S_IRWXU; break; case ACL_USER: case ACL_GROUP: not_equiv = 1; break; case ACL_GROUP_OBJ: group_obj = pa; break; case ACL_OTHER: pa->e_perm &= mode | ~S_IRWXO; mode &= pa->e_perm | ~S_IRWXO; break; case ACL_MASK: mask_obj = pa; not_equiv = 1; break; default: return -EIO; } } if (mask_obj) { mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO; mode &= (mask_obj->e_perm << 3) | ~S_IRWXG; } else { if (!group_obj) return -EIO; group_obj->e_perm &= (mode >> 3) | ~S_IRWXO; mode &= (group_obj->e_perm << 3) | ~S_IRWXG; } *mode_p = (*mode_p & ~S_IRWXUGO) | mode; return not_equiv; } /* * Modify the ACL for the chmod syscall. */ |
5bf3258fd fs: make posix_ac... |
432 |
static int __posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode) |
1da177e4c Linux-2.6.12-rc2 |
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 |
{ struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; struct posix_acl_entry *pa, *pe; /* assert(atomic_read(acl->a_refcount) == 1); */ FOREACH_ACL_ENTRY(pa, acl, pe) { switch(pa->e_tag) { case ACL_USER_OBJ: pa->e_perm = (mode & S_IRWXU) >> 6; break; case ACL_USER: case ACL_GROUP: break; case ACL_GROUP_OBJ: group_obj = pa; break; case ACL_MASK: mask_obj = pa; break; case ACL_OTHER: pa->e_perm = (mode & S_IRWXO); break; default: return -EIO; } } if (mask_obj) { mask_obj->e_perm = (mode & S_IRWXG) >> 3; } else { if (!group_obj) return -EIO; group_obj->e_perm = (mode & S_IRWXG) >> 3; } return 0; } |
bc26ab5f6 kill boilerplate ... |
476 477 |
int |
37bc15392 fs: make posix_ac... |
478 |
__posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p) |
826cae2f2 kill boilerplates... |
479 480 481 482 483 484 485 486 487 488 489 490 491 492 |
{ struct posix_acl *clone = posix_acl_clone(*acl, gfp); int err = -ENOMEM; if (clone) { err = posix_acl_create_masq(clone, mode_p); if (err < 0) { posix_acl_release(clone); clone = NULL; } } posix_acl_release(*acl); *acl = clone; return err; } |
37bc15392 fs: make posix_ac... |
493 |
EXPORT_SYMBOL(__posix_acl_create); |
826cae2f2 kill boilerplates... |
494 495 |
int |
5bf3258fd fs: make posix_ac... |
496 |
__posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode) |
bc26ab5f6 kill boilerplate ... |
497 498 499 500 |
{ struct posix_acl *clone = posix_acl_clone(*acl, gfp); int err = -ENOMEM; if (clone) { |
5bf3258fd fs: make posix_ac... |
501 |
err = __posix_acl_chmod_masq(clone, mode); |
bc26ab5f6 kill boilerplate ... |
502 503 504 505 506 507 508 509 510 |
if (err) { posix_acl_release(clone); clone = NULL; } } posix_acl_release(*acl); *acl = clone; return err; } |
5bf3258fd fs: make posix_ac... |
511 512 513 |
EXPORT_SYMBOL(__posix_acl_chmod); int |
37bc15392 fs: make posix_ac... |
514 |
posix_acl_chmod(struct inode *inode, umode_t mode) |
5bf3258fd fs: make posix_ac... |
515 516 517 518 519 520 521 522 523 524 |
{ struct posix_acl *acl; int ret = 0; if (!IS_POSIXACL(inode)) return 0; if (!inode->i_op->set_acl) return -EOPNOTSUPP; acl = get_acl(inode, ACL_TYPE_ACCESS); |
789b663ae fs: get_acl() mus... |
525 526 527 |
if (IS_ERR_OR_NULL(acl)) { if (acl == ERR_PTR(-EOPNOTSUPP)) return 0; |
5bf3258fd fs: make posix_ac... |
528 |
return PTR_ERR(acl); |
789b663ae fs: get_acl() mus... |
529 |
} |
5bf3258fd fs: make posix_ac... |
530 |
|
37bc15392 fs: make posix_ac... |
531 |
ret = __posix_acl_chmod(&acl, GFP_KERNEL, mode); |
5bf3258fd fs: make posix_ac... |
532 533 534 535 536 537 |
if (ret) return ret; ret = inode->i_op->set_acl(inode, acl, ACL_TYPE_ACCESS); posix_acl_release(acl); return ret; } |
bc26ab5f6 kill boilerplate ... |
538 |
EXPORT_SYMBOL(posix_acl_chmod); |
5c8ebd57b fs: merge xattr_a... |
539 |
|
37bc15392 fs: make posix_ac... |
540 541 542 543 544 545 546 547 548 549 550 |
int posix_acl_create(struct inode *dir, umode_t *mode, struct posix_acl **default_acl, struct posix_acl **acl) { struct posix_acl *p; int ret; if (S_ISLNK(*mode) || !IS_POSIXACL(dir)) goto no_acl; p = get_acl(dir, ACL_TYPE_DEFAULT); |
789b663ae fs: get_acl() mus... |
551 552 553 |
if (IS_ERR(p)) { if (p == ERR_PTR(-EOPNOTSUPP)) goto apply_umask; |
37bc15392 fs: make posix_ac... |
554 |
return PTR_ERR(p); |
37bc15392 fs: make posix_ac... |
555 |
} |
789b663ae fs: get_acl() mus... |
556 557 |
if (!p) goto apply_umask; |
37bc15392 fs: make posix_ac... |
558 559 |
*acl = posix_acl_clone(p, GFP_NOFS); if (!*acl) |
fed0b588b posix_acl: fix re... |
560 |
goto no_mem; |
37bc15392 fs: make posix_ac... |
561 562 |
ret = posix_acl_create_masq(*acl, mode); |
fed0b588b posix_acl: fix re... |
563 564 |
if (ret < 0) goto no_mem_clone; |
37bc15392 fs: make posix_ac... |
565 566 567 568 569 570 571 572 573 574 575 576 577 |
if (ret == 0) { posix_acl_release(*acl); *acl = NULL; } if (!S_ISDIR(*mode)) { posix_acl_release(p); *default_acl = NULL; } else { *default_acl = p; } return 0; |
789b663ae fs: get_acl() mus... |
578 579 |
apply_umask: *mode &= ~current_umask(); |
37bc15392 fs: make posix_ac... |
580 581 582 583 |
no_acl: *default_acl = NULL; *acl = NULL; return 0; |
fed0b588b posix_acl: fix re... |
584 585 586 587 588 589 |
no_mem_clone: posix_acl_release(*acl); no_mem: posix_acl_release(p); return -ENOMEM; |
37bc15392 fs: make posix_ac... |
590 591 |
} EXPORT_SYMBOL_GPL(posix_acl_create); |
5c8ebd57b fs: merge xattr_a... |
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 |
/* * Fix up the uids and gids in posix acl extended attributes in place. */ static void posix_acl_fix_xattr_userns( struct user_namespace *to, struct user_namespace *from, void *value, size_t size) { posix_acl_xattr_header *header = (posix_acl_xattr_header *)value; posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end; int count; kuid_t uid; kgid_t gid; if (!value) return; if (size < sizeof(posix_acl_xattr_header)) return; if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) return; count = posix_acl_xattr_count(size); if (count < 0) return; if (count == 0) return; for (end = entry + count; entry != end; entry++) { switch(le16_to_cpu(entry->e_tag)) { case ACL_USER: uid = make_kuid(from, le32_to_cpu(entry->e_id)); entry->e_id = cpu_to_le32(from_kuid(to, uid)); break; case ACL_GROUP: gid = make_kgid(from, le32_to_cpu(entry->e_id)); entry->e_id = cpu_to_le32(from_kgid(to, gid)); break; default: break; } } } void posix_acl_fix_xattr_from_user(void *value, size_t size) { struct user_namespace *user_ns = current_user_ns(); if (user_ns == &init_user_ns) return; posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size); } void posix_acl_fix_xattr_to_user(void *value, size_t size) { struct user_namespace *user_ns = current_user_ns(); if (user_ns == &init_user_ns) return; posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size); } /* * Convert from extended attribute to in-memory representation. */ struct posix_acl * posix_acl_from_xattr(struct user_namespace *user_ns, const void *value, size_t size) { posix_acl_xattr_header *header = (posix_acl_xattr_header *)value; posix_acl_xattr_entry *entry = (posix_acl_xattr_entry *)(header+1), *end; int count; struct posix_acl *acl; struct posix_acl_entry *acl_e; if (!value) return NULL; if (size < sizeof(posix_acl_xattr_header)) return ERR_PTR(-EINVAL); if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) return ERR_PTR(-EOPNOTSUPP); count = posix_acl_xattr_count(size); if (count < 0) return ERR_PTR(-EINVAL); if (count == 0) return NULL; acl = posix_acl_alloc(count, GFP_NOFS); if (!acl) return ERR_PTR(-ENOMEM); acl_e = acl->a_entries; for (end = entry + count; entry != end; acl_e++, entry++) { acl_e->e_tag = le16_to_cpu(entry->e_tag); acl_e->e_perm = le16_to_cpu(entry->e_perm); switch(acl_e->e_tag) { case ACL_USER_OBJ: case ACL_GROUP_OBJ: case ACL_MASK: case ACL_OTHER: break; case ACL_USER: acl_e->e_uid = make_kuid(user_ns, le32_to_cpu(entry->e_id)); if (!uid_valid(acl_e->e_uid)) goto fail; break; case ACL_GROUP: acl_e->e_gid = make_kgid(user_ns, le32_to_cpu(entry->e_id)); if (!gid_valid(acl_e->e_gid)) goto fail; break; default: goto fail; } } return acl; fail: posix_acl_release(acl); return ERR_PTR(-EINVAL); } EXPORT_SYMBOL (posix_acl_from_xattr); /* * Convert from in-memory to extended attribute representation. */ int posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl, void *buffer, size_t size) { posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer; |
47ba97344 fs: NULL derefere... |
727 |
posix_acl_xattr_entry *ext_entry; |
5c8ebd57b fs: merge xattr_a... |
728 729 730 731 732 733 734 |
int real_size, n; real_size = posix_acl_xattr_size(acl->a_count); if (!buffer) return real_size; if (real_size > size) return -ERANGE; |
47ba97344 fs: NULL derefere... |
735 736 |
ext_entry = ext_acl->a_entries; |
5c8ebd57b fs: merge xattr_a... |
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 |
ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION); for (n=0; n < acl->a_count; n++, ext_entry++) { const struct posix_acl_entry *acl_e = &acl->a_entries[n]; ext_entry->e_tag = cpu_to_le16(acl_e->e_tag); ext_entry->e_perm = cpu_to_le16(acl_e->e_perm); switch(acl_e->e_tag) { case ACL_USER: ext_entry->e_id = cpu_to_le32(from_kuid(user_ns, acl_e->e_uid)); break; case ACL_GROUP: ext_entry->e_id = cpu_to_le32(from_kgid(user_ns, acl_e->e_gid)); break; default: ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); break; } } return real_size; } EXPORT_SYMBOL (posix_acl_to_xattr); |
2aeccbe95 fs: add generic x... |
760 761 762 763 764 765 766 |
static int posix_acl_xattr_get(struct dentry *dentry, const char *name, void *value, size_t size, int type) { struct posix_acl *acl; int error; |
bb668734c VFS: assorted d_b... |
767 |
if (!IS_POSIXACL(d_backing_inode(dentry))) |
2aeccbe95 fs: add generic x... |
768 |
return -EOPNOTSUPP; |
e36cb0b89 VFS: (Scripted) C... |
769 |
if (d_is_symlink(dentry)) |
2aeccbe95 fs: add generic x... |
770 |
return -EOPNOTSUPP; |
bb668734c VFS: assorted d_b... |
771 |
acl = get_acl(d_backing_inode(dentry), type); |
2aeccbe95 fs: add generic x... |
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 |
if (IS_ERR(acl)) return PTR_ERR(acl); if (acl == NULL) return -ENODATA; error = posix_acl_to_xattr(&init_user_ns, acl, value, size); posix_acl_release(acl); return error; } static int posix_acl_xattr_set(struct dentry *dentry, const char *name, const void *value, size_t size, int flags, int type) { |
bb668734c VFS: assorted d_b... |
787 |
struct inode *inode = d_backing_inode(dentry); |
2aeccbe95 fs: add generic x... |
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 |
struct posix_acl *acl = NULL; int ret; if (!IS_POSIXACL(inode)) return -EOPNOTSUPP; if (!inode->i_op->set_acl) return -EOPNOTSUPP; if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) return value ? -EACCES : 0; if (!inode_owner_or_capable(inode)) return -EPERM; if (value) { acl = posix_acl_from_xattr(&init_user_ns, value, size); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { ret = posix_acl_valid(acl); if (ret) goto out; } } ret = inode->i_op->set_acl(inode, acl, type); out: posix_acl_release(acl); return ret; } static size_t posix_acl_xattr_list(struct dentry *dentry, char *list, size_t list_size, const char *name, size_t name_len, int type) { const char *xname; size_t size; |
bb668734c VFS: assorted d_b... |
825 |
if (!IS_POSIXACL(d_backing_inode(dentry))) |
2aeccbe95 fs: add generic x... |
826 |
return -EOPNOTSUPP; |
e36cb0b89 VFS: (Scripted) C... |
827 |
if (d_is_symlink(dentry)) |
2aeccbe95 fs: add generic x... |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 |
return -EOPNOTSUPP; if (type == ACL_TYPE_ACCESS) xname = POSIX_ACL_XATTR_ACCESS; else xname = POSIX_ACL_XATTR_DEFAULT; size = strlen(xname) + 1; if (list && size <= list_size) memcpy(list, xname, size); return size; } const struct xattr_handler posix_acl_access_xattr_handler = { .prefix = POSIX_ACL_XATTR_ACCESS, .flags = ACL_TYPE_ACCESS, .list = posix_acl_xattr_list, .get = posix_acl_xattr_get, .set = posix_acl_xattr_set, }; EXPORT_SYMBOL_GPL(posix_acl_access_xattr_handler); const struct xattr_handler posix_acl_default_xattr_handler = { .prefix = POSIX_ACL_XATTR_DEFAULT, .flags = ACL_TYPE_DEFAULT, .list = posix_acl_xattr_list, .get = posix_acl_xattr_get, .set = posix_acl_xattr_set, }; EXPORT_SYMBOL_GPL(posix_acl_default_xattr_handler); |
feda821e7 fs: remove generi... |
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 |
int simple_set_acl(struct inode *inode, struct posix_acl *acl, int type) { int error; if (type == ACL_TYPE_ACCESS) { error = posix_acl_equiv_mode(acl, &inode->i_mode); if (error < 0) return 0; if (error == 0) acl = NULL; } inode->i_ctime = CURRENT_TIME; set_cached_acl(inode, type, acl); return 0; } int simple_acl_create(struct inode *dir, struct inode *inode) { struct posix_acl *default_acl, *acl; int error; error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); if (error) return error; set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl); set_cached_acl(inode, ACL_TYPE_ACCESS, acl); if (default_acl) posix_acl_release(default_acl); if (acl) posix_acl_release(acl); return 0; } |