Commit | Line | Data |
---|---|---|
973c9f4f | 1 | /* Userspace key control operations |
1da177e4 | 2 | * |
3e30148c | 3 | * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/syscalls.h> | |
59e6b9c1 | 17 | #include <linux/key.h> |
1da177e4 LT |
18 | #include <linux/keyctl.h> |
19 | #include <linux/fs.h> | |
c59ede7b | 20 | #include <linux/capability.h> |
0cb409d9 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/err.h> |
38bbca6b | 23 | #include <linux/vmalloc.h> |
70a5bb72 | 24 | #include <linux/security.h> |
a27bb332 | 25 | #include <linux/uio.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include "internal.h" | |
28 | ||
0cb409d9 DA |
29 | static int key_get_type_from_user(char *type, |
30 | const char __user *_type, | |
31 | unsigned len) | |
32 | { | |
33 | int ret; | |
34 | ||
35 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 36 | if (ret < 0) |
4303ef19 | 37 | return ret; |
0cb409d9 DA |
38 | if (ret == 0 || ret >= len) |
39 | return -EINVAL; | |
0cb409d9 DA |
40 | if (type[0] == '.') |
41 | return -EPERM; | |
0cb409d9 | 42 | type[len - 1] = '\0'; |
0cb409d9 DA |
43 | return 0; |
44 | } | |
45 | ||
1da177e4 | 46 | /* |
973c9f4f DH |
47 | * Extract the description of a new key from userspace and either add it as a |
48 | * new key to the specified keyring or update a matching key in that keyring. | |
49 | * | |
cf7f601c DH |
50 | * If the description is NULL or an empty string, the key type is asked to |
51 | * generate one from the payload. | |
52 | * | |
973c9f4f DH |
53 | * The keyring must be writable so that we can attach the key to it. |
54 | * | |
55 | * If successful, the new key's serial number is returned, otherwise an error | |
56 | * code is returned. | |
1da177e4 | 57 | */ |
1e7bfb21 HC |
58 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
59 | const char __user *, _description, | |
60 | const void __user *, _payload, | |
61 | size_t, plen, | |
62 | key_serial_t, ringid) | |
1da177e4 | 63 | { |
664cceb0 | 64 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
65 | char type[32], *description; |
66 | void *payload; | |
0cb409d9 | 67 | long ret; |
38bbca6b | 68 | bool vm; |
1da177e4 LT |
69 | |
70 | ret = -EINVAL; | |
38bbca6b | 71 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
72 | goto error; |
73 | ||
74 | /* draw all the data into kernel space */ | |
0cb409d9 | 75 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
76 | if (ret < 0) |
77 | goto error; | |
1da177e4 | 78 | |
cf7f601c DH |
79 | description = NULL; |
80 | if (_description) { | |
81 | description = strndup_user(_description, PAGE_SIZE); | |
82 | if (IS_ERR(description)) { | |
83 | ret = PTR_ERR(description); | |
84 | goto error; | |
85 | } | |
86 | if (!*description) { | |
87 | kfree(description); | |
88 | description = NULL; | |
89 | } | |
0cb409d9 | 90 | } |
1da177e4 LT |
91 | |
92 | /* pull the payload in if one was supplied */ | |
93 | payload = NULL; | |
94 | ||
38bbca6b | 95 | vm = false; |
1da177e4 LT |
96 | if (_payload) { |
97 | ret = -ENOMEM; | |
4f1c28d2 | 98 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
99 | if (!payload) { |
100 | if (plen <= PAGE_SIZE) | |
101 | goto error2; | |
102 | vm = true; | |
103 | payload = vmalloc(plen); | |
104 | if (!payload) | |
105 | goto error2; | |
106 | } | |
1da177e4 LT |
107 | |
108 | ret = -EFAULT; | |
109 | if (copy_from_user(payload, _payload, plen) != 0) | |
110 | goto error3; | |
111 | } | |
112 | ||
113 | /* find the target keyring (which must be writable) */ | |
5593122e | 114 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
115 | if (IS_ERR(keyring_ref)) { |
116 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
117 | goto error3; |
118 | } | |
119 | ||
120 | /* create or update the requested key and add it to the target | |
121 | * keyring */ | |
664cceb0 | 122 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
123 | payload, plen, KEY_PERM_UNDEF, |
124 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
125 | if (!IS_ERR(key_ref)) { |
126 | ret = key_ref_to_ptr(key_ref)->serial; | |
127 | key_ref_put(key_ref); | |
1da177e4 LT |
128 | } |
129 | else { | |
664cceb0 | 130 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
131 | } |
132 | ||
664cceb0 | 133 | key_ref_put(keyring_ref); |
1da177e4 | 134 | error3: |
38bbca6b DH |
135 | if (!vm) |
136 | kfree(payload); | |
137 | else | |
138 | vfree(payload); | |
1da177e4 LT |
139 | error2: |
140 | kfree(description); | |
141 | error: | |
142 | return ret; | |
a8b17ed0 | 143 | } |
1da177e4 | 144 | |
1da177e4 | 145 | /* |
973c9f4f DH |
146 | * Search the process keyrings and keyring trees linked from those for a |
147 | * matching key. Keyrings must have appropriate Search permission to be | |
148 | * searched. | |
149 | * | |
150 | * If a key is found, it will be attached to the destination keyring if there's | |
151 | * one specified and the serial number of the key will be returned. | |
152 | * | |
153 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
154 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
155 | * passed to /sbin/request-key to aid with completing the request. If the | |
156 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 157 | */ |
1e7bfb21 HC |
158 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
159 | const char __user *, _description, | |
160 | const char __user *, _callout_info, | |
161 | key_serial_t, destringid) | |
1da177e4 LT |
162 | { |
163 | struct key_type *ktype; | |
664cceb0 DH |
164 | struct key *key; |
165 | key_ref_t dest_ref; | |
4a38e122 | 166 | size_t callout_len; |
1da177e4 | 167 | char type[32], *description, *callout_info; |
0cb409d9 | 168 | long ret; |
1da177e4 LT |
169 | |
170 | /* pull the type into kernel space */ | |
0cb409d9 | 171 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
172 | if (ret < 0) |
173 | goto error; | |
1260f801 | 174 | |
1da177e4 | 175 | /* pull the description into kernel space */ |
0cb409d9 DA |
176 | description = strndup_user(_description, PAGE_SIZE); |
177 | if (IS_ERR(description)) { | |
178 | ret = PTR_ERR(description); | |
1da177e4 | 179 | goto error; |
0cb409d9 | 180 | } |
1da177e4 LT |
181 | |
182 | /* pull the callout info into kernel space */ | |
183 | callout_info = NULL; | |
4a38e122 | 184 | callout_len = 0; |
1da177e4 | 185 | if (_callout_info) { |
0cb409d9 DA |
186 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
187 | if (IS_ERR(callout_info)) { | |
188 | ret = PTR_ERR(callout_info); | |
1da177e4 | 189 | goto error2; |
0cb409d9 | 190 | } |
4a38e122 | 191 | callout_len = strlen(callout_info); |
1da177e4 LT |
192 | } |
193 | ||
194 | /* get the destination keyring if specified */ | |
664cceb0 | 195 | dest_ref = NULL; |
1da177e4 | 196 | if (destringid) { |
5593122e DH |
197 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
198 | KEY_WRITE); | |
664cceb0 DH |
199 | if (IS_ERR(dest_ref)) { |
200 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
201 | goto error3; |
202 | } | |
203 | } | |
204 | ||
205 | /* find the key type */ | |
206 | ktype = key_type_lookup(type); | |
207 | if (IS_ERR(ktype)) { | |
208 | ret = PTR_ERR(ktype); | |
209 | goto error4; | |
210 | } | |
211 | ||
212 | /* do the search */ | |
4a38e122 DH |
213 | key = request_key_and_link(ktype, description, callout_info, |
214 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 215 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
216 | if (IS_ERR(key)) { |
217 | ret = PTR_ERR(key); | |
218 | goto error5; | |
219 | } | |
220 | ||
4aab1e89 DH |
221 | /* wait for the key to finish being constructed */ |
222 | ret = wait_for_key_construction(key, 1); | |
223 | if (ret < 0) | |
224 | goto error6; | |
225 | ||
1da177e4 LT |
226 | ret = key->serial; |
227 | ||
4aab1e89 | 228 | error6: |
3e30148c | 229 | key_put(key); |
c5b60b5e | 230 | error5: |
1da177e4 | 231 | key_type_put(ktype); |
c5b60b5e | 232 | error4: |
664cceb0 | 233 | key_ref_put(dest_ref); |
c5b60b5e | 234 | error3: |
1da177e4 | 235 | kfree(callout_info); |
c5b60b5e | 236 | error2: |
1da177e4 | 237 | kfree(description); |
c5b60b5e | 238 | error: |
1da177e4 | 239 | return ret; |
a8b17ed0 | 240 | } |
1da177e4 | 241 | |
1da177e4 | 242 | /* |
973c9f4f DH |
243 | * Get the ID of the specified process keyring. |
244 | * | |
245 | * The requested keyring must have search permission to be found. | |
246 | * | |
247 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
248 | */ |
249 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
250 | { | |
664cceb0 | 251 | key_ref_t key_ref; |
5593122e | 252 | unsigned long lflags; |
1da177e4 LT |
253 | long ret; |
254 | ||
5593122e DH |
255 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
256 | key_ref = lookup_user_key(id, lflags, KEY_SEARCH); | |
664cceb0 DH |
257 | if (IS_ERR(key_ref)) { |
258 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
259 | goto error; |
260 | } | |
261 | ||
664cceb0 DH |
262 | ret = key_ref_to_ptr(key_ref)->serial; |
263 | key_ref_put(key_ref); | |
c5b60b5e | 264 | error: |
1da177e4 | 265 | return ret; |
973c9f4f | 266 | } |
1da177e4 | 267 | |
1da177e4 | 268 | /* |
973c9f4f DH |
269 | * Join a (named) session keyring. |
270 | * | |
271 | * Create and join an anonymous session keyring or join a named session | |
272 | * keyring, creating it if necessary. A named session keyring must have Search | |
273 | * permission for it to be joined. Session keyrings without this permit will | |
274 | * be skipped over. | |
275 | * | |
276 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
277 | */ |
278 | long keyctl_join_session_keyring(const char __user *_name) | |
279 | { | |
280 | char *name; | |
0cb409d9 | 281 | long ret; |
1da177e4 LT |
282 | |
283 | /* fetch the name from userspace */ | |
284 | name = NULL; | |
285 | if (_name) { | |
0cb409d9 DA |
286 | name = strndup_user(_name, PAGE_SIZE); |
287 | if (IS_ERR(name)) { | |
288 | ret = PTR_ERR(name); | |
1da177e4 | 289 | goto error; |
0cb409d9 | 290 | } |
1da177e4 LT |
291 | } |
292 | ||
293 | /* join the session */ | |
294 | ret = join_session_keyring(name); | |
0d54ee1c | 295 | kfree(name); |
1da177e4 | 296 | |
c5b60b5e | 297 | error: |
1da177e4 | 298 | return ret; |
a8b17ed0 | 299 | } |
1da177e4 | 300 | |
1da177e4 | 301 | /* |
973c9f4f DH |
302 | * Update a key's data payload from the given data. |
303 | * | |
304 | * The key must grant the caller Write permission and the key type must support | |
305 | * updating for this to work. A negative key can be positively instantiated | |
306 | * with this call. | |
307 | * | |
308 | * If successful, 0 will be returned. If the key type does not support | |
309 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
310 | */ |
311 | long keyctl_update_key(key_serial_t id, | |
312 | const void __user *_payload, | |
313 | size_t plen) | |
314 | { | |
664cceb0 | 315 | key_ref_t key_ref; |
1da177e4 LT |
316 | void *payload; |
317 | long ret; | |
318 | ||
319 | ret = -EINVAL; | |
320 | if (plen > PAGE_SIZE) | |
321 | goto error; | |
322 | ||
323 | /* pull the payload in if one was supplied */ | |
324 | payload = NULL; | |
325 | if (_payload) { | |
326 | ret = -ENOMEM; | |
327 | payload = kmalloc(plen, GFP_KERNEL); | |
328 | if (!payload) | |
329 | goto error; | |
330 | ||
331 | ret = -EFAULT; | |
332 | if (copy_from_user(payload, _payload, plen) != 0) | |
333 | goto error2; | |
334 | } | |
335 | ||
336 | /* find the target key (which must be writable) */ | |
5593122e | 337 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
338 | if (IS_ERR(key_ref)) { |
339 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
340 | goto error2; |
341 | } | |
342 | ||
343 | /* update the key */ | |
664cceb0 | 344 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 345 | |
664cceb0 | 346 | key_ref_put(key_ref); |
c5b60b5e | 347 | error2: |
1da177e4 | 348 | kfree(payload); |
c5b60b5e | 349 | error: |
1da177e4 | 350 | return ret; |
a8b17ed0 | 351 | } |
1da177e4 | 352 | |
1da177e4 | 353 | /* |
973c9f4f DH |
354 | * Revoke a key. |
355 | * | |
356 | * The key must be grant the caller Write or Setattr permission for this to | |
357 | * work. The key type should give up its quota claim when revoked. The key | |
358 | * and any links to the key will be automatically garbage collected after a | |
359 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
360 | * | |
361 | * If successful, 0 is returned. | |
1da177e4 LT |
362 | */ |
363 | long keyctl_revoke_key(key_serial_t id) | |
364 | { | |
664cceb0 | 365 | key_ref_t key_ref; |
1da177e4 LT |
366 | long ret; |
367 | ||
5593122e | 368 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
369 | if (IS_ERR(key_ref)) { |
370 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
371 | if (ret != -EACCES) |
372 | goto error; | |
373 | key_ref = lookup_user_key(id, 0, KEY_SETATTR); | |
374 | if (IS_ERR(key_ref)) { | |
375 | ret = PTR_ERR(key_ref); | |
376 | goto error; | |
377 | } | |
1da177e4 LT |
378 | } |
379 | ||
664cceb0 | 380 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
381 | ret = 0; |
382 | ||
664cceb0 | 383 | key_ref_put(key_ref); |
c5b60b5e | 384 | error: |
1260f801 | 385 | return ret; |
a8b17ed0 | 386 | } |
1da177e4 | 387 | |
fd75815f DH |
388 | /* |
389 | * Invalidate a key. | |
390 | * | |
391 | * The key must be grant the caller Invalidate permission for this to work. | |
392 | * The key and any links to the key will be automatically garbage collected | |
393 | * immediately. | |
394 | * | |
395 | * If successful, 0 is returned. | |
396 | */ | |
397 | long keyctl_invalidate_key(key_serial_t id) | |
398 | { | |
399 | key_ref_t key_ref; | |
400 | long ret; | |
401 | ||
402 | kenter("%d", id); | |
403 | ||
404 | key_ref = lookup_user_key(id, 0, KEY_SEARCH); | |
405 | if (IS_ERR(key_ref)) { | |
406 | ret = PTR_ERR(key_ref); | |
407 | goto error; | |
408 | } | |
409 | ||
410 | key_invalidate(key_ref_to_ptr(key_ref)); | |
411 | ret = 0; | |
412 | ||
413 | key_ref_put(key_ref); | |
414 | error: | |
415 | kleave(" = %ld", ret); | |
416 | return ret; | |
417 | } | |
418 | ||
1da177e4 | 419 | /* |
973c9f4f DH |
420 | * Clear the specified keyring, creating an empty process keyring if one of the |
421 | * special keyring IDs is used. | |
422 | * | |
423 | * The keyring must grant the caller Write permission for this to work. If | |
424 | * successful, 0 will be returned. | |
1da177e4 LT |
425 | */ |
426 | long keyctl_keyring_clear(key_serial_t ringid) | |
427 | { | |
664cceb0 | 428 | key_ref_t keyring_ref; |
1da177e4 LT |
429 | long ret; |
430 | ||
5593122e | 431 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
432 | if (IS_ERR(keyring_ref)) { |
433 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
434 | |
435 | /* Root is permitted to invalidate certain special keyrings */ | |
436 | if (capable(CAP_SYS_ADMIN)) { | |
437 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
438 | if (IS_ERR(keyring_ref)) | |
439 | goto error; | |
440 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
441 | &key_ref_to_ptr(keyring_ref)->flags)) | |
442 | goto clear; | |
443 | goto error_put; | |
444 | } | |
445 | ||
1da177e4 LT |
446 | goto error; |
447 | } | |
448 | ||
700920eb | 449 | clear: |
664cceb0 | 450 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 451 | error_put: |
664cceb0 | 452 | key_ref_put(keyring_ref); |
c5b60b5e | 453 | error: |
1da177e4 | 454 | return ret; |
a8b17ed0 | 455 | } |
1da177e4 | 456 | |
1da177e4 | 457 | /* |
973c9f4f DH |
458 | * Create a link from a keyring to a key if there's no matching key in the |
459 | * keyring, otherwise replace the link to the matching key with a link to the | |
460 | * new key. | |
461 | * | |
462 | * The key must grant the caller Link permission and the the keyring must grant | |
463 | * the caller Write permission. Furthermore, if an additional link is created, | |
464 | * the keyring's quota will be extended. | |
465 | * | |
466 | * If successful, 0 will be returned. | |
1da177e4 LT |
467 | */ |
468 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
469 | { | |
664cceb0 | 470 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
471 | long ret; |
472 | ||
5593122e | 473 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
474 | if (IS_ERR(keyring_ref)) { |
475 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
476 | goto error; |
477 | } | |
478 | ||
5593122e | 479 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK); |
664cceb0 DH |
480 | if (IS_ERR(key_ref)) { |
481 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
482 | goto error2; |
483 | } | |
484 | ||
664cceb0 | 485 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 486 | |
664cceb0 | 487 | key_ref_put(key_ref); |
c5b60b5e | 488 | error2: |
664cceb0 | 489 | key_ref_put(keyring_ref); |
c5b60b5e | 490 | error: |
1da177e4 | 491 | return ret; |
a8b17ed0 | 492 | } |
1da177e4 | 493 | |
1da177e4 | 494 | /* |
973c9f4f DH |
495 | * Unlink a key from a keyring. |
496 | * | |
497 | * The keyring must grant the caller Write permission for this to work; the key | |
498 | * itself need not grant the caller anything. If the last link to a key is | |
499 | * removed then that key will be scheduled for destruction. | |
500 | * | |
501 | * If successful, 0 will be returned. | |
1da177e4 LT |
502 | */ |
503 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
504 | { | |
664cceb0 | 505 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
506 | long ret; |
507 | ||
5593122e | 508 | keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE); |
664cceb0 DH |
509 | if (IS_ERR(keyring_ref)) { |
510 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
511 | goto error; |
512 | } | |
513 | ||
5593122e | 514 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
515 | if (IS_ERR(key_ref)) { |
516 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
517 | goto error2; |
518 | } | |
519 | ||
664cceb0 | 520 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 521 | |
664cceb0 | 522 | key_ref_put(key_ref); |
c5b60b5e | 523 | error2: |
664cceb0 | 524 | key_ref_put(keyring_ref); |
c5b60b5e | 525 | error: |
1da177e4 | 526 | return ret; |
a8b17ed0 | 527 | } |
1da177e4 | 528 | |
1da177e4 | 529 | /* |
973c9f4f DH |
530 | * Return a description of a key to userspace. |
531 | * | |
532 | * The key must grant the caller View permission for this to work. | |
533 | * | |
534 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
535 | * in the following way: | |
536 | * | |
1da177e4 | 537 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
538 | * |
539 | * If successful, we return the amount of description available, irrespective | |
540 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
541 | */ |
542 | long keyctl_describe_key(key_serial_t keyid, | |
543 | char __user *buffer, | |
544 | size_t buflen) | |
545 | { | |
3e30148c | 546 | struct key *key, *instkey; |
664cceb0 | 547 | key_ref_t key_ref; |
1da177e4 LT |
548 | char *tmpbuf; |
549 | long ret; | |
550 | ||
5593122e | 551 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
664cceb0 | 552 | if (IS_ERR(key_ref)) { |
3e30148c DH |
553 | /* viewing a key under construction is permitted if we have the |
554 | * authorisation token handy */ | |
664cceb0 | 555 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
556 | instkey = key_get_instantiation_authkey(keyid); |
557 | if (!IS_ERR(instkey)) { | |
558 | key_put(instkey); | |
8bbf4976 | 559 | key_ref = lookup_user_key(keyid, |
5593122e DH |
560 | KEY_LOOKUP_PARTIAL, |
561 | 0); | |
664cceb0 | 562 | if (!IS_ERR(key_ref)) |
3e30148c DH |
563 | goto okay; |
564 | } | |
565 | } | |
566 | ||
664cceb0 | 567 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
568 | goto error; |
569 | } | |
570 | ||
3e30148c | 571 | okay: |
1da177e4 LT |
572 | /* calculate how much description we're going to return */ |
573 | ret = -ENOMEM; | |
574 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
575 | if (!tmpbuf) | |
576 | goto error2; | |
577 | ||
664cceb0 DH |
578 | key = key_ref_to_ptr(key_ref); |
579 | ||
1da177e4 | 580 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
664cceb0 | 581 | "%s;%d;%d;%08x;%s", |
94fd8405 | 582 | key->type->name, |
9a56c2db EB |
583 | from_kuid_munged(current_user_ns(), key->uid), |
584 | from_kgid_munged(current_user_ns(), key->gid), | |
94fd8405 DH |
585 | key->perm, |
586 | key->description ?: ""); | |
1da177e4 LT |
587 | |
588 | /* include a NUL char at the end of the data */ | |
589 | if (ret > PAGE_SIZE - 1) | |
590 | ret = PAGE_SIZE - 1; | |
591 | tmpbuf[ret] = 0; | |
592 | ret++; | |
593 | ||
594 | /* consider returning the data */ | |
595 | if (buffer && buflen > 0) { | |
596 | if (buflen > ret) | |
597 | buflen = ret; | |
598 | ||
599 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) | |
600 | ret = -EFAULT; | |
601 | } | |
602 | ||
603 | kfree(tmpbuf); | |
c5b60b5e | 604 | error2: |
664cceb0 | 605 | key_ref_put(key_ref); |
c5b60b5e | 606 | error: |
1da177e4 | 607 | return ret; |
a8b17ed0 | 608 | } |
1da177e4 | 609 | |
1da177e4 | 610 | /* |
973c9f4f DH |
611 | * Search the specified keyring and any keyrings it links to for a matching |
612 | * key. Only keyrings that grant the caller Search permission will be searched | |
613 | * (this includes the starting keyring). Only keys with Search permission can | |
614 | * be found. | |
615 | * | |
616 | * If successful, the found key will be linked to the destination keyring if | |
617 | * supplied and the key has Link permission, and the found key ID will be | |
618 | * returned. | |
1da177e4 LT |
619 | */ |
620 | long keyctl_keyring_search(key_serial_t ringid, | |
621 | const char __user *_type, | |
622 | const char __user *_description, | |
623 | key_serial_t destringid) | |
624 | { | |
625 | struct key_type *ktype; | |
664cceb0 | 626 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 627 | char type[32], *description; |
0cb409d9 | 628 | long ret; |
1da177e4 LT |
629 | |
630 | /* pull the type and description into kernel space */ | |
0cb409d9 | 631 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
632 | if (ret < 0) |
633 | goto error; | |
1da177e4 | 634 | |
0cb409d9 DA |
635 | description = strndup_user(_description, PAGE_SIZE); |
636 | if (IS_ERR(description)) { | |
637 | ret = PTR_ERR(description); | |
1da177e4 | 638 | goto error; |
0cb409d9 | 639 | } |
1da177e4 LT |
640 | |
641 | /* get the keyring at which to begin the search */ | |
5593122e | 642 | keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH); |
664cceb0 DH |
643 | if (IS_ERR(keyring_ref)) { |
644 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
645 | goto error2; |
646 | } | |
647 | ||
648 | /* get the destination keyring if specified */ | |
664cceb0 | 649 | dest_ref = NULL; |
1da177e4 | 650 | if (destringid) { |
5593122e DH |
651 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
652 | KEY_WRITE); | |
664cceb0 DH |
653 | if (IS_ERR(dest_ref)) { |
654 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
655 | goto error3; |
656 | } | |
657 | } | |
658 | ||
659 | /* find the key type */ | |
660 | ktype = key_type_lookup(type); | |
661 | if (IS_ERR(ktype)) { | |
662 | ret = PTR_ERR(ktype); | |
663 | goto error4; | |
664 | } | |
665 | ||
666 | /* do the search */ | |
664cceb0 DH |
667 | key_ref = keyring_search(keyring_ref, ktype, description); |
668 | if (IS_ERR(key_ref)) { | |
669 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
670 | |
671 | /* treat lack or presence of a negative key the same */ | |
672 | if (ret == -EAGAIN) | |
673 | ret = -ENOKEY; | |
674 | goto error5; | |
675 | } | |
676 | ||
677 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 678 | if (dest_ref) { |
29db9190 DH |
679 | ret = key_permission(key_ref, KEY_LINK); |
680 | if (ret < 0) | |
1da177e4 LT |
681 | goto error6; |
682 | ||
664cceb0 | 683 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
684 | if (ret < 0) |
685 | goto error6; | |
686 | } | |
687 | ||
664cceb0 | 688 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 689 | |
c5b60b5e | 690 | error6: |
664cceb0 | 691 | key_ref_put(key_ref); |
c5b60b5e | 692 | error5: |
1da177e4 | 693 | key_type_put(ktype); |
c5b60b5e | 694 | error4: |
664cceb0 | 695 | key_ref_put(dest_ref); |
c5b60b5e | 696 | error3: |
664cceb0 | 697 | key_ref_put(keyring_ref); |
c5b60b5e | 698 | error2: |
1da177e4 | 699 | kfree(description); |
c5b60b5e | 700 | error: |
1da177e4 | 701 | return ret; |
a8b17ed0 | 702 | } |
1da177e4 | 703 | |
1da177e4 | 704 | /* |
973c9f4f DH |
705 | * Read a key's payload. |
706 | * | |
707 | * The key must either grant the caller Read permission, or it must grant the | |
708 | * caller Search permission when searched for from the process keyrings. | |
709 | * | |
710 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
711 | * is provided, and return the amount of data that is available in the key, | |
712 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
713 | */ |
714 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
715 | { | |
664cceb0 DH |
716 | struct key *key; |
717 | key_ref_t key_ref; | |
1da177e4 LT |
718 | long ret; |
719 | ||
720 | /* find the key first */ | |
5593122e | 721 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
722 | if (IS_ERR(key_ref)) { |
723 | ret = -ENOKEY; | |
724 | goto error; | |
1da177e4 LT |
725 | } |
726 | ||
664cceb0 DH |
727 | key = key_ref_to_ptr(key_ref); |
728 | ||
729 | /* see if we can read it directly */ | |
29db9190 DH |
730 | ret = key_permission(key_ref, KEY_READ); |
731 | if (ret == 0) | |
664cceb0 | 732 | goto can_read_key; |
29db9190 DH |
733 | if (ret != -EACCES) |
734 | goto error; | |
664cceb0 DH |
735 | |
736 | /* we can't; see if it's searchable from this process's keyrings | |
737 | * - we automatically take account of the fact that it may be | |
738 | * dangling off an instantiation key | |
739 | */ | |
740 | if (!is_key_possessed(key_ref)) { | |
741 | ret = -EACCES; | |
742 | goto error2; | |
743 | } | |
1da177e4 LT |
744 | |
745 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 746 | can_read_key: |
1da177e4 LT |
747 | ret = key_validate(key); |
748 | if (ret == 0) { | |
749 | ret = -EOPNOTSUPP; | |
750 | if (key->type->read) { | |
751 | /* read the data with the semaphore held (since we | |
752 | * might sleep) */ | |
753 | down_read(&key->sem); | |
754 | ret = key->type->read(key, buffer, buflen); | |
755 | up_read(&key->sem); | |
756 | } | |
757 | } | |
758 | ||
c5b60b5e | 759 | error2: |
1da177e4 | 760 | key_put(key); |
c5b60b5e | 761 | error: |
1da177e4 | 762 | return ret; |
a8b17ed0 | 763 | } |
1da177e4 | 764 | |
1da177e4 | 765 | /* |
973c9f4f DH |
766 | * Change the ownership of a key |
767 | * | |
768 | * The key must grant the caller Setattr permission for this to work, though | |
769 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
770 | * for the GID to be changed to a group the caller is not a member of, the | |
771 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
772 | * attribute is not changed. | |
773 | * | |
774 | * If the UID is to be changed, the new user must have sufficient quota to | |
775 | * accept the key. The quota deduction will be removed from the old user to | |
776 | * the new user should the attribute be changed. | |
777 | * | |
778 | * If successful, 0 will be returned. | |
1da177e4 | 779 | */ |
9a56c2db | 780 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 781 | { |
5801649d | 782 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 783 | struct key *key; |
664cceb0 | 784 | key_ref_t key_ref; |
1da177e4 | 785 | long ret; |
9a56c2db EB |
786 | kuid_t uid; |
787 | kgid_t gid; | |
788 | ||
789 | uid = make_kuid(current_user_ns(), user); | |
790 | gid = make_kgid(current_user_ns(), group); | |
791 | ret = -EINVAL; | |
792 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
793 | goto error; | |
794 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
795 | goto error; | |
1da177e4 LT |
796 | |
797 | ret = 0; | |
9a56c2db | 798 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
799 | goto error; |
800 | ||
5593122e DH |
801 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
802 | KEY_SETATTR); | |
664cceb0 DH |
803 | if (IS_ERR(key_ref)) { |
804 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
805 | goto error; |
806 | } | |
807 | ||
664cceb0 DH |
808 | key = key_ref_to_ptr(key_ref); |
809 | ||
1da177e4 LT |
810 | /* make the changes with the locks held to prevent chown/chown races */ |
811 | ret = -EACCES; | |
812 | down_write(&key->sem); | |
1da177e4 LT |
813 | |
814 | if (!capable(CAP_SYS_ADMIN)) { | |
815 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 816 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 817 | goto error_put; |
1da177e4 LT |
818 | |
819 | /* only the sysadmin can set the key's GID to a group other | |
820 | * than one of those that the current process subscribes to */ | |
9a56c2db | 821 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 822 | goto error_put; |
1da177e4 LT |
823 | } |
824 | ||
5801649d | 825 | /* change the UID */ |
9a56c2db | 826 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 827 | ret = -ENOMEM; |
9a56c2db | 828 | newowner = key_user_lookup(uid); |
5801649d FT |
829 | if (!newowner) |
830 | goto error_put; | |
831 | ||
832 | /* transfer the quota burden to the new user */ | |
833 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 834 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 835 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 836 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
837 | key_quota_root_maxbytes : key_quota_maxbytes; |
838 | ||
5801649d | 839 | spin_lock(&newowner->lock); |
0b77f5bf DH |
840 | if (newowner->qnkeys + 1 >= maxkeys || |
841 | newowner->qnbytes + key->quotalen >= maxbytes || | |
842 | newowner->qnbytes + key->quotalen < | |
843 | newowner->qnbytes) | |
5801649d FT |
844 | goto quota_overrun; |
845 | ||
846 | newowner->qnkeys++; | |
847 | newowner->qnbytes += key->quotalen; | |
848 | spin_unlock(&newowner->lock); | |
849 | ||
850 | spin_lock(&key->user->lock); | |
851 | key->user->qnkeys--; | |
852 | key->user->qnbytes -= key->quotalen; | |
853 | spin_unlock(&key->user->lock); | |
854 | } | |
855 | ||
856 | atomic_dec(&key->user->nkeys); | |
857 | atomic_inc(&newowner->nkeys); | |
858 | ||
859 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
860 | atomic_dec(&key->user->nikeys); | |
861 | atomic_inc(&newowner->nikeys); | |
862 | } | |
863 | ||
864 | zapowner = key->user; | |
865 | key->user = newowner; | |
866 | key->uid = uid; | |
1da177e4 LT |
867 | } |
868 | ||
869 | /* change the GID */ | |
9a56c2db | 870 | if (group != (gid_t) -1) |
1da177e4 LT |
871 | key->gid = gid; |
872 | ||
873 | ret = 0; | |
874 | ||
5801649d | 875 | error_put: |
1da177e4 LT |
876 | up_write(&key->sem); |
877 | key_put(key); | |
5801649d FT |
878 | if (zapowner) |
879 | key_user_put(zapowner); | |
880 | error: | |
1da177e4 LT |
881 | return ret; |
882 | ||
5801649d FT |
883 | quota_overrun: |
884 | spin_unlock(&newowner->lock); | |
885 | zapowner = newowner; | |
886 | ret = -EDQUOT; | |
887 | goto error_put; | |
a8b17ed0 | 888 | } |
5801649d | 889 | |
1da177e4 | 890 | /* |
973c9f4f DH |
891 | * Change the permission mask on a key. |
892 | * | |
893 | * The key must grant the caller Setattr permission for this to work, though | |
894 | * the key need not be fully instantiated yet. If the caller does not have | |
895 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
896 | */ |
897 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
898 | { | |
899 | struct key *key; | |
664cceb0 | 900 | key_ref_t key_ref; |
1da177e4 LT |
901 | long ret; |
902 | ||
903 | ret = -EINVAL; | |
664cceb0 | 904 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
905 | goto error; |
906 | ||
5593122e DH |
907 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
908 | KEY_SETATTR); | |
664cceb0 DH |
909 | if (IS_ERR(key_ref)) { |
910 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
911 | goto error; |
912 | } | |
913 | ||
664cceb0 DH |
914 | key = key_ref_to_ptr(key_ref); |
915 | ||
76d8aeab | 916 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
917 | ret = -EACCES; |
918 | down_write(&key->sem); | |
1da177e4 | 919 | |
76d8aeab | 920 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 921 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
922 | key->perm = perm; |
923 | ret = 0; | |
924 | } | |
1da177e4 | 925 | |
1da177e4 LT |
926 | up_write(&key->sem); |
927 | key_put(key); | |
76d8aeab | 928 | error: |
1da177e4 | 929 | return ret; |
a8b17ed0 | 930 | } |
1da177e4 | 931 | |
8bbf4976 | 932 | /* |
973c9f4f DH |
933 | * Get the destination keyring for instantiation and check that the caller has |
934 | * Write permission on it. | |
8bbf4976 DH |
935 | */ |
936 | static long get_instantiation_keyring(key_serial_t ringid, | |
937 | struct request_key_auth *rka, | |
938 | struct key **_dest_keyring) | |
939 | { | |
940 | key_ref_t dkref; | |
941 | ||
eca1bf5b DH |
942 | *_dest_keyring = NULL; |
943 | ||
8bbf4976 | 944 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 945 | if (ringid == 0) |
8bbf4976 | 946 | return 0; |
8bbf4976 DH |
947 | |
948 | /* if a specific keyring is nominated by ID, then use that */ | |
949 | if (ringid > 0) { | |
5593122e | 950 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
8bbf4976 DH |
951 | if (IS_ERR(dkref)) |
952 | return PTR_ERR(dkref); | |
953 | *_dest_keyring = key_ref_to_ptr(dkref); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
958 | return -EINVAL; | |
959 | ||
960 | /* otherwise specify the destination keyring recorded in the | |
961 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
962 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 963 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
964 | return 0; |
965 | } | |
966 | ||
967 | return -ENOKEY; | |
968 | } | |
969 | ||
d84f4f99 | 970 | /* |
973c9f4f | 971 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
972 | */ |
973 | static int keyctl_change_reqkey_auth(struct key *key) | |
974 | { | |
975 | struct cred *new; | |
976 | ||
977 | new = prepare_creds(); | |
978 | if (!new) | |
979 | return -ENOMEM; | |
980 | ||
981 | key_put(new->request_key_auth); | |
982 | new->request_key_auth = key_get(key); | |
983 | ||
984 | return commit_creds(new); | |
985 | } | |
986 | ||
ee009e4a DH |
987 | /* |
988 | * Copy the iovec data from userspace | |
989 | */ | |
990 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
991 | unsigned ioc) | |
992 | { | |
993 | for (; ioc > 0; ioc--) { | |
994 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
995 | return -EFAULT; | |
996 | buffer += iov->iov_len; | |
997 | iov++; | |
998 | } | |
999 | return 0; | |
1000 | } | |
1001 | ||
1da177e4 | 1002 | /* |
973c9f4f DH |
1003 | * Instantiate a key with the specified payload and link the key into the |
1004 | * destination keyring if one is given. | |
1005 | * | |
1006 | * The caller must have the appropriate instantiation permit set for this to | |
1007 | * work (see keyctl_assume_authority). No other permissions are required. | |
1008 | * | |
1009 | * If successful, 0 will be returned. | |
1da177e4 | 1010 | */ |
ee009e4a DH |
1011 | long keyctl_instantiate_key_common(key_serial_t id, |
1012 | const struct iovec *payload_iov, | |
1013 | unsigned ioc, | |
1014 | size_t plen, | |
1015 | key_serial_t ringid) | |
1da177e4 | 1016 | { |
d84f4f99 | 1017 | const struct cred *cred = current_cred(); |
3e30148c | 1018 | struct request_key_auth *rka; |
8bbf4976 | 1019 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1020 | void *payload; |
1021 | long ret; | |
38bbca6b | 1022 | bool vm = false; |
1da177e4 | 1023 | |
d84f4f99 DH |
1024 | kenter("%d,,%zu,%d", id, plen, ringid); |
1025 | ||
1da177e4 | 1026 | ret = -EINVAL; |
38bbca6b | 1027 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1028 | goto error; |
1029 | ||
b5f545c8 DH |
1030 | /* the appropriate instantiation authorisation key must have been |
1031 | * assumed before calling this */ | |
1032 | ret = -EPERM; | |
d84f4f99 | 1033 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1034 | if (!instkey) |
1035 | goto error; | |
1036 | ||
1037 | rka = instkey->payload.data; | |
1038 | if (rka->target_key->serial != id) | |
1039 | goto error; | |
1040 | ||
1da177e4 LT |
1041 | /* pull the payload in if one was supplied */ |
1042 | payload = NULL; | |
1043 | ||
ee009e4a | 1044 | if (payload_iov) { |
1da177e4 LT |
1045 | ret = -ENOMEM; |
1046 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1047 | if (!payload) { |
1048 | if (plen <= PAGE_SIZE) | |
1049 | goto error; | |
1050 | vm = true; | |
1051 | payload = vmalloc(plen); | |
1052 | if (!payload) | |
1053 | goto error; | |
1054 | } | |
1da177e4 | 1055 | |
ee009e4a DH |
1056 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
1057 | if (ret < 0) | |
1da177e4 LT |
1058 | goto error2; |
1059 | } | |
1060 | ||
3e30148c DH |
1061 | /* find the destination keyring amongst those belonging to the |
1062 | * requesting task */ | |
8bbf4976 DH |
1063 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1064 | if (ret < 0) | |
1065 | goto error2; | |
1da177e4 LT |
1066 | |
1067 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1068 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1069 | dest_keyring, instkey); |
1da177e4 | 1070 | |
8bbf4976 | 1071 | key_put(dest_keyring); |
b5f545c8 DH |
1072 | |
1073 | /* discard the assumed authority if it's just been disabled by | |
1074 | * instantiation of the key */ | |
d84f4f99 DH |
1075 | if (ret == 0) |
1076 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1077 | |
1078 | error2: | |
38bbca6b DH |
1079 | if (!vm) |
1080 | kfree(payload); | |
1081 | else | |
1082 | vfree(payload); | |
b5f545c8 | 1083 | error: |
1da177e4 | 1084 | return ret; |
a8b17ed0 | 1085 | } |
1da177e4 | 1086 | |
ee009e4a DH |
1087 | /* |
1088 | * Instantiate a key with the specified payload and link the key into the | |
1089 | * destination keyring if one is given. | |
1090 | * | |
1091 | * The caller must have the appropriate instantiation permit set for this to | |
1092 | * work (see keyctl_assume_authority). No other permissions are required. | |
1093 | * | |
1094 | * If successful, 0 will be returned. | |
1095 | */ | |
1096 | long keyctl_instantiate_key(key_serial_t id, | |
1097 | const void __user *_payload, | |
1098 | size_t plen, | |
1099 | key_serial_t ringid) | |
1100 | { | |
1101 | if (_payload && plen) { | |
1102 | struct iovec iov[1] = { | |
1103 | [0].iov_base = (void __user *)_payload, | |
1104 | [0].iov_len = plen | |
1105 | }; | |
1106 | ||
1107 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1108 | } | |
1109 | ||
1110 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Instantiate a key with the specified multipart payload and link the key into | |
1115 | * the destination keyring if one is given. | |
1116 | * | |
1117 | * The caller must have the appropriate instantiation permit set for this to | |
1118 | * work (see keyctl_assume_authority). No other permissions are required. | |
1119 | * | |
1120 | * If successful, 0 will be returned. | |
1121 | */ | |
1122 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1123 | const struct iovec __user *_payload_iov, | |
1124 | unsigned ioc, | |
1125 | key_serial_t ringid) | |
1126 | { | |
1127 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1128 | long ret; | |
1129 | ||
423b9788 | 1130 | if (!_payload_iov || !ioc) |
ee009e4a DH |
1131 | goto no_payload; |
1132 | ||
1133 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
ac34ebb3 | 1134 | ARRAY_SIZE(iovstack), iovstack, &iov); |
ee009e4a | 1135 | if (ret < 0) |
a84a9219 | 1136 | goto err; |
ee009e4a DH |
1137 | if (ret == 0) |
1138 | goto no_payload_free; | |
1139 | ||
1140 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
a84a9219 | 1141 | err: |
ee009e4a DH |
1142 | if (iov != iovstack) |
1143 | kfree(iov); | |
1144 | return ret; | |
1145 | ||
1146 | no_payload_free: | |
1147 | if (iov != iovstack) | |
1148 | kfree(iov); | |
1149 | no_payload: | |
1150 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1151 | } | |
1152 | ||
1da177e4 | 1153 | /* |
973c9f4f DH |
1154 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1155 | * the key into the destination keyring if one is given. | |
1156 | * | |
1157 | * The caller must have the appropriate instantiation permit set for this to | |
1158 | * work (see keyctl_assume_authority). No other permissions are required. | |
1159 | * | |
1160 | * The key and any links to the key will be automatically garbage collected | |
1161 | * after the timeout expires. | |
1162 | * | |
1163 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1164 | * them to return -ENOKEY until the negative key expires. | |
1165 | * | |
1166 | * If successful, 0 will be returned. | |
1da177e4 LT |
1167 | */ |
1168 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1169 | { |
1170 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1175 | * code and link the key into the destination keyring if one is given. | |
1176 | * | |
1177 | * The caller must have the appropriate instantiation permit set for this to | |
1178 | * work (see keyctl_assume_authority). No other permissions are required. | |
1179 | * | |
1180 | * The key and any links to the key will be automatically garbage collected | |
1181 | * after the timeout expires. | |
1182 | * | |
1183 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1184 | * them to return the specified error code until the negative key expires. | |
1185 | * | |
1186 | * If successful, 0 will be returned. | |
1187 | */ | |
1188 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1189 | key_serial_t ringid) | |
1da177e4 | 1190 | { |
d84f4f99 | 1191 | const struct cred *cred = current_cred(); |
3e30148c | 1192 | struct request_key_auth *rka; |
8bbf4976 | 1193 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1194 | long ret; |
1195 | ||
fdd1b945 DH |
1196 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1197 | ||
1198 | /* must be a valid error code and mustn't be a kernel special */ | |
1199 | if (error <= 0 || | |
1200 | error >= MAX_ERRNO || | |
1201 | error == ERESTARTSYS || | |
1202 | error == ERESTARTNOINTR || | |
1203 | error == ERESTARTNOHAND || | |
1204 | error == ERESTART_RESTARTBLOCK) | |
1205 | return -EINVAL; | |
d84f4f99 | 1206 | |
b5f545c8 DH |
1207 | /* the appropriate instantiation authorisation key must have been |
1208 | * assumed before calling this */ | |
1209 | ret = -EPERM; | |
d84f4f99 | 1210 | instkey = cred->request_key_auth; |
b5f545c8 | 1211 | if (!instkey) |
1da177e4 | 1212 | goto error; |
1da177e4 | 1213 | |
3e30148c | 1214 | rka = instkey->payload.data; |
b5f545c8 DH |
1215 | if (rka->target_key->serial != id) |
1216 | goto error; | |
3e30148c | 1217 | |
1da177e4 LT |
1218 | /* find the destination keyring if present (which must also be |
1219 | * writable) */ | |
8bbf4976 DH |
1220 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1221 | if (ret < 0) | |
1222 | goto error; | |
1da177e4 LT |
1223 | |
1224 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1225 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1226 | dest_keyring, instkey); |
1da177e4 | 1227 | |
8bbf4976 | 1228 | key_put(dest_keyring); |
b5f545c8 DH |
1229 | |
1230 | /* discard the assumed authority if it's just been disabled by | |
1231 | * instantiation of the key */ | |
d84f4f99 DH |
1232 | if (ret == 0) |
1233 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1234 | |
1235 | error: | |
1da177e4 | 1236 | return ret; |
a8b17ed0 | 1237 | } |
1da177e4 | 1238 | |
3e30148c | 1239 | /* |
973c9f4f DH |
1240 | * Read or set the default keyring in which request_key() will cache keys and |
1241 | * return the old setting. | |
1242 | * | |
1243 | * If a process keyring is specified then this will be created if it doesn't | |
1244 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1245 | */ |
1246 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1247 | { | |
d84f4f99 DH |
1248 | struct cred *new; |
1249 | int ret, old_setting; | |
1250 | ||
1251 | old_setting = current_cred_xxx(jit_keyring); | |
1252 | ||
1253 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1254 | return old_setting; | |
1255 | ||
1256 | new = prepare_creds(); | |
1257 | if (!new) | |
1258 | return -ENOMEM; | |
3e30148c DH |
1259 | |
1260 | switch (reqkey_defl) { | |
1261 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1262 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1263 | if (ret < 0) |
d84f4f99 | 1264 | goto error; |
3e30148c DH |
1265 | goto set; |
1266 | ||
1267 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1268 | ret = install_process_keyring_to_cred(new); |
1269 | if (ret < 0) { | |
1270 | if (ret != -EEXIST) | |
1271 | goto error; | |
1272 | ret = 0; | |
1273 | } | |
1274 | goto set; | |
3e30148c DH |
1275 | |
1276 | case KEY_REQKEY_DEFL_DEFAULT: | |
1277 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1278 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1279 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1280 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1281 | goto set; | |
3e30148c DH |
1282 | |
1283 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1284 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1285 | default: | |
d84f4f99 DH |
1286 | ret = -EINVAL; |
1287 | goto error; | |
3e30148c DH |
1288 | } |
1289 | ||
d84f4f99 DH |
1290 | set: |
1291 | new->jit_keyring = reqkey_defl; | |
1292 | commit_creds(new); | |
1293 | return old_setting; | |
1294 | error: | |
1295 | abort_creds(new); | |
4303ef19 | 1296 | return ret; |
a8b17ed0 | 1297 | } |
d84f4f99 | 1298 | |
017679c4 | 1299 | /* |
973c9f4f DH |
1300 | * Set or clear the timeout on a key. |
1301 | * | |
1302 | * Either the key must grant the caller Setattr permission or else the caller | |
1303 | * must hold an instantiation authorisation token for the key. | |
1304 | * | |
1305 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1306 | * the current time. The key and any links to the key will be automatically | |
1307 | * garbage collected after the timeout expires. | |
1308 | * | |
1309 | * If successful, 0 is returned. | |
017679c4 DH |
1310 | */ |
1311 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1312 | { | |
9156235b | 1313 | struct key *key, *instkey; |
017679c4 | 1314 | key_ref_t key_ref; |
017679c4 DH |
1315 | long ret; |
1316 | ||
5593122e DH |
1317 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
1318 | KEY_SETATTR); | |
017679c4 | 1319 | if (IS_ERR(key_ref)) { |
9156235b DH |
1320 | /* setting the timeout on a key under construction is permitted |
1321 | * if we have the authorisation token handy */ | |
1322 | if (PTR_ERR(key_ref) == -EACCES) { | |
1323 | instkey = key_get_instantiation_authkey(id); | |
1324 | if (!IS_ERR(instkey)) { | |
1325 | key_put(instkey); | |
1326 | key_ref = lookup_user_key(id, | |
1327 | KEY_LOOKUP_PARTIAL, | |
1328 | 0); | |
1329 | if (!IS_ERR(key_ref)) | |
1330 | goto okay; | |
1331 | } | |
1332 | } | |
1333 | ||
017679c4 DH |
1334 | ret = PTR_ERR(key_ref); |
1335 | goto error; | |
1336 | } | |
1337 | ||
9156235b | 1338 | okay: |
017679c4 | 1339 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1340 | key_set_timeout(key, timeout); |
017679c4 DH |
1341 | key_put(key); |
1342 | ||
1343 | ret = 0; | |
1344 | error: | |
1345 | return ret; | |
a8b17ed0 | 1346 | } |
017679c4 | 1347 | |
b5f545c8 | 1348 | /* |
973c9f4f DH |
1349 | * Assume (or clear) the authority to instantiate the specified key. |
1350 | * | |
1351 | * This sets the authoritative token currently in force for key instantiation. | |
1352 | * This must be done for a key to be instantiated. It has the effect of making | |
1353 | * available all the keys from the caller of the request_key() that created a | |
1354 | * key to request_key() calls made by the caller of this function. | |
1355 | * | |
1356 | * The caller must have the instantiation key in their process keyrings with a | |
1357 | * Search permission grant available to the caller. | |
1358 | * | |
1359 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1360 | * | |
1361 | * If the ID given has a matching an authorisation key, then that key will be | |
1362 | * set and its ID will be returned. The authorisation key can be read to get | |
1363 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1364 | */ |
1365 | long keyctl_assume_authority(key_serial_t id) | |
1366 | { | |
1367 | struct key *authkey; | |
1368 | long ret; | |
1369 | ||
1370 | /* special key IDs aren't permitted */ | |
1371 | ret = -EINVAL; | |
1372 | if (id < 0) | |
1373 | goto error; | |
1374 | ||
1375 | /* we divest ourselves of authority if given an ID of 0 */ | |
1376 | if (id == 0) { | |
d84f4f99 | 1377 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1378 | goto error; |
1379 | } | |
1380 | ||
1381 | /* attempt to assume the authority temporarily granted to us whilst we | |
1382 | * instantiate the specified key | |
1383 | * - the authorisation key must be in the current task's keyrings | |
1384 | * somewhere | |
1385 | */ | |
1386 | authkey = key_get_instantiation_authkey(id); | |
1387 | if (IS_ERR(authkey)) { | |
1388 | ret = PTR_ERR(authkey); | |
1389 | goto error; | |
1390 | } | |
1391 | ||
d84f4f99 DH |
1392 | ret = keyctl_change_reqkey_auth(authkey); |
1393 | if (ret < 0) | |
1394 | goto error; | |
1395 | key_put(authkey); | |
b5f545c8 | 1396 | |
d84f4f99 | 1397 | ret = authkey->serial; |
b5f545c8 DH |
1398 | error: |
1399 | return ret; | |
a8b17ed0 | 1400 | } |
b5f545c8 | 1401 | |
70a5bb72 | 1402 | /* |
973c9f4f DH |
1403 | * Get a key's the LSM security label. |
1404 | * | |
1405 | * The key must grant the caller View permission for this to work. | |
1406 | * | |
1407 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1408 | * | |
1409 | * If successful, the amount of information available will be returned, | |
1410 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1411 | */ |
1412 | long keyctl_get_security(key_serial_t keyid, | |
1413 | char __user *buffer, | |
1414 | size_t buflen) | |
1415 | { | |
1416 | struct key *key, *instkey; | |
1417 | key_ref_t key_ref; | |
1418 | char *context; | |
1419 | long ret; | |
1420 | ||
5593122e | 1421 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
70a5bb72 DH |
1422 | if (IS_ERR(key_ref)) { |
1423 | if (PTR_ERR(key_ref) != -EACCES) | |
1424 | return PTR_ERR(key_ref); | |
1425 | ||
1426 | /* viewing a key under construction is also permitted if we | |
1427 | * have the authorisation token handy */ | |
1428 | instkey = key_get_instantiation_authkey(keyid); | |
1429 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1430 | return PTR_ERR(instkey); |
70a5bb72 DH |
1431 | key_put(instkey); |
1432 | ||
5593122e | 1433 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1434 | if (IS_ERR(key_ref)) |
1435 | return PTR_ERR(key_ref); | |
1436 | } | |
1437 | ||
1438 | key = key_ref_to_ptr(key_ref); | |
1439 | ret = security_key_getsecurity(key, &context); | |
1440 | if (ret == 0) { | |
1441 | /* if no information was returned, give userspace an empty | |
1442 | * string */ | |
1443 | ret = 1; | |
1444 | if (buffer && buflen > 0 && | |
1445 | copy_to_user(buffer, "", 1) != 0) | |
1446 | ret = -EFAULT; | |
1447 | } else if (ret > 0) { | |
1448 | /* return as much data as there's room for */ | |
1449 | if (buffer && buflen > 0) { | |
1450 | if (buflen > ret) | |
1451 | buflen = ret; | |
1452 | ||
1453 | if (copy_to_user(buffer, context, buflen) != 0) | |
1454 | ret = -EFAULT; | |
1455 | } | |
1456 | ||
1457 | kfree(context); | |
1458 | } | |
1459 | ||
1460 | key_ref_put(key_ref); | |
1461 | return ret; | |
1462 | } | |
1463 | ||
ee18d64c | 1464 | /* |
973c9f4f DH |
1465 | * Attempt to install the calling process's session keyring on the process's |
1466 | * parent process. | |
1467 | * | |
1468 | * The keyring must exist and must grant the caller LINK permission, and the | |
1469 | * parent process must be single-threaded and must have the same effective | |
1470 | * ownership as this process and mustn't be SUID/SGID. | |
1471 | * | |
1472 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1473 | * | |
1474 | * If successful, 0 will be returned. | |
ee18d64c DH |
1475 | */ |
1476 | long keyctl_session_to_parent(void) | |
1477 | { | |
1478 | struct task_struct *me, *parent; | |
1479 | const struct cred *mycred, *pcred; | |
67d12145 | 1480 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1481 | key_ref_t keyring_r; |
413cd3d9 | 1482 | struct cred *cred; |
ee18d64c DH |
1483 | int ret; |
1484 | ||
1485 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK); | |
1486 | if (IS_ERR(keyring_r)) | |
1487 | return PTR_ERR(keyring_r); | |
1488 | ||
413cd3d9 | 1489 | ret = -ENOMEM; |
413cd3d9 | 1490 | |
ee18d64c DH |
1491 | /* our parent is going to need a new cred struct, a new tgcred struct |
1492 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1493 | * our parent */ | |
ee18d64c DH |
1494 | cred = cred_alloc_blank(); |
1495 | if (!cred) | |
67d12145 AV |
1496 | goto error_keyring; |
1497 | newwork = &cred->rcu; | |
ee18d64c | 1498 | |
3a50597d DH |
1499 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1500 | keyring_r = NULL; | |
67d12145 | 1501 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1502 | |
1503 | me = current; | |
9d1ac65a | 1504 | rcu_read_lock(); |
ee18d64c DH |
1505 | write_lock_irq(&tasklist_lock); |
1506 | ||
ee18d64c | 1507 | ret = -EPERM; |
413cd3d9 ON |
1508 | oldwork = NULL; |
1509 | parent = me->real_parent; | |
ee18d64c DH |
1510 | |
1511 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1512 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1513 | goto unlock; |
ee18d64c DH |
1514 | |
1515 | /* the parent must be single threaded */ | |
dd98acf7 | 1516 | if (!thread_group_empty(parent)) |
413cd3d9 | 1517 | goto unlock; |
ee18d64c DH |
1518 | |
1519 | /* the parent and the child must have different session keyrings or | |
1520 | * there's no point */ | |
1521 | mycred = current_cred(); | |
1522 | pcred = __task_cred(parent); | |
1523 | if (mycred == pcred || | |
3a50597d | 1524 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1525 | ret = 0; |
1526 | goto unlock; | |
1527 | } | |
ee18d64c DH |
1528 | |
1529 | /* the parent must have the same effective ownership and mustn't be | |
1530 | * SUID/SGID */ | |
9a56c2db EB |
1531 | if (!uid_eq(pcred->uid, mycred->euid) || |
1532 | !uid_eq(pcred->euid, mycred->euid) || | |
1533 | !uid_eq(pcred->suid, mycred->euid) || | |
1534 | !gid_eq(pcred->gid, mycred->egid) || | |
1535 | !gid_eq(pcred->egid, mycred->egid) || | |
1536 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1537 | goto unlock; |
ee18d64c DH |
1538 | |
1539 | /* the keyrings must have the same UID */ | |
3a50597d | 1540 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1541 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1542 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1543 | goto unlock; |
ee18d64c | 1544 | |
413cd3d9 ON |
1545 | /* cancel an already pending keyring replacement */ |
1546 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1547 | |
1548 | /* the replacement session keyring is applied just prior to userspace | |
1549 | * restarting */ | |
67d12145 | 1550 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1551 | if (!ret) |
1552 | newwork = NULL; | |
1553 | unlock: | |
ee18d64c | 1554 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1555 | rcu_read_unlock(); |
67d12145 AV |
1556 | if (oldwork) |
1557 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1558 | if (newwork) | |
1559 | put_cred(cred); | |
ee18d64c DH |
1560 | return ret; |
1561 | ||
1562 | error_keyring: | |
1563 | key_ref_put(keyring_r); | |
1564 | return ret; | |
1565 | } | |
1566 | ||
1da177e4 | 1567 | /* |
973c9f4f | 1568 | * The key control system call |
1da177e4 | 1569 | */ |
938bb9f5 HC |
1570 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1571 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1572 | { |
1573 | switch (option) { | |
1574 | case KEYCTL_GET_KEYRING_ID: | |
1575 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1576 | (int) arg3); | |
1577 | ||
1578 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1579 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1580 | ||
1581 | case KEYCTL_UPDATE: | |
1582 | return keyctl_update_key((key_serial_t) arg2, | |
1583 | (const void __user *) arg3, | |
1584 | (size_t) arg4); | |
1585 | ||
1586 | case KEYCTL_REVOKE: | |
1587 | return keyctl_revoke_key((key_serial_t) arg2); | |
1588 | ||
1589 | case KEYCTL_DESCRIBE: | |
1590 | return keyctl_describe_key((key_serial_t) arg2, | |
1591 | (char __user *) arg3, | |
1592 | (unsigned) arg4); | |
1593 | ||
1594 | case KEYCTL_CLEAR: | |
1595 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1596 | ||
1597 | case KEYCTL_LINK: | |
1598 | return keyctl_keyring_link((key_serial_t) arg2, | |
1599 | (key_serial_t) arg3); | |
1600 | ||
1601 | case KEYCTL_UNLINK: | |
1602 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1603 | (key_serial_t) arg3); | |
1604 | ||
1605 | case KEYCTL_SEARCH: | |
1606 | return keyctl_keyring_search((key_serial_t) arg2, | |
1607 | (const char __user *) arg3, | |
1608 | (const char __user *) arg4, | |
1609 | (key_serial_t) arg5); | |
1610 | ||
1611 | case KEYCTL_READ: | |
1612 | return keyctl_read_key((key_serial_t) arg2, | |
1613 | (char __user *) arg3, | |
1614 | (size_t) arg4); | |
1615 | ||
1616 | case KEYCTL_CHOWN: | |
1617 | return keyctl_chown_key((key_serial_t) arg2, | |
1618 | (uid_t) arg3, | |
1619 | (gid_t) arg4); | |
1620 | ||
1621 | case KEYCTL_SETPERM: | |
1622 | return keyctl_setperm_key((key_serial_t) arg2, | |
1623 | (key_perm_t) arg3); | |
1624 | ||
1625 | case KEYCTL_INSTANTIATE: | |
1626 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1627 | (const void __user *) arg3, | |
1628 | (size_t) arg4, | |
1629 | (key_serial_t) arg5); | |
1630 | ||
1631 | case KEYCTL_NEGATE: | |
1632 | return keyctl_negate_key((key_serial_t) arg2, | |
1633 | (unsigned) arg3, | |
1634 | (key_serial_t) arg4); | |
1635 | ||
3e30148c DH |
1636 | case KEYCTL_SET_REQKEY_KEYRING: |
1637 | return keyctl_set_reqkey_keyring(arg2); | |
1638 | ||
017679c4 DH |
1639 | case KEYCTL_SET_TIMEOUT: |
1640 | return keyctl_set_timeout((key_serial_t) arg2, | |
1641 | (unsigned) arg3); | |
1642 | ||
b5f545c8 DH |
1643 | case KEYCTL_ASSUME_AUTHORITY: |
1644 | return keyctl_assume_authority((key_serial_t) arg2); | |
1645 | ||
70a5bb72 DH |
1646 | case KEYCTL_GET_SECURITY: |
1647 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1648 | (char __user *) arg3, |
70a5bb72 DH |
1649 | (size_t) arg4); |
1650 | ||
ee18d64c DH |
1651 | case KEYCTL_SESSION_TO_PARENT: |
1652 | return keyctl_session_to_parent(); | |
1653 | ||
fdd1b945 DH |
1654 | case KEYCTL_REJECT: |
1655 | return keyctl_reject_key((key_serial_t) arg2, | |
1656 | (unsigned) arg3, | |
1657 | (unsigned) arg4, | |
1658 | (key_serial_t) arg5); | |
1659 | ||
ee009e4a DH |
1660 | case KEYCTL_INSTANTIATE_IOV: |
1661 | return keyctl_instantiate_key_iov( | |
1662 | (key_serial_t) arg2, | |
1663 | (const struct iovec __user *) arg3, | |
1664 | (unsigned) arg4, | |
1665 | (key_serial_t) arg5); | |
1666 | ||
fd75815f DH |
1667 | case KEYCTL_INVALIDATE: |
1668 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1669 | ||
f36f8c75 DH |
1670 | case KEYCTL_GET_PERSISTENT: |
1671 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1672 | ||
1da177e4 LT |
1673 | default: |
1674 | return -EOPNOTSUPP; | |
1675 | } | |
a8b17ed0 | 1676 | } |