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 | ||
aa9d4437 DH |
29 | #define KEY_MAX_DESC_SIZE 4096 |
30 | ||
0cb409d9 DA |
31 | static int key_get_type_from_user(char *type, |
32 | const char __user *_type, | |
33 | unsigned len) | |
34 | { | |
35 | int ret; | |
36 | ||
37 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 38 | if (ret < 0) |
4303ef19 | 39 | return ret; |
0cb409d9 DA |
40 | if (ret == 0 || ret >= len) |
41 | return -EINVAL; | |
54e2c2c1 DH |
42 | if (type[0] == '.') |
43 | return -EPERM; | |
0cb409d9 | 44 | type[len - 1] = '\0'; |
0cb409d9 DA |
45 | return 0; |
46 | } | |
47 | ||
1da177e4 | 48 | /* |
973c9f4f DH |
49 | * Extract the description of a new key from userspace and either add it as a |
50 | * new key to the specified keyring or update a matching key in that keyring. | |
51 | * | |
cf7f601c DH |
52 | * If the description is NULL or an empty string, the key type is asked to |
53 | * generate one from the payload. | |
54 | * | |
973c9f4f DH |
55 | * The keyring must be writable so that we can attach the key to it. |
56 | * | |
57 | * If successful, the new key's serial number is returned, otherwise an error | |
58 | * code is returned. | |
1da177e4 | 59 | */ |
1e7bfb21 HC |
60 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
61 | const char __user *, _description, | |
62 | const void __user *, _payload, | |
63 | size_t, plen, | |
64 | key_serial_t, ringid) | |
1da177e4 | 65 | { |
664cceb0 | 66 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
67 | char type[32], *description; |
68 | void *payload; | |
0cb409d9 | 69 | long ret; |
38bbca6b | 70 | bool vm; |
1da177e4 LT |
71 | |
72 | ret = -EINVAL; | |
38bbca6b | 73 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
74 | goto error; |
75 | ||
76 | /* draw all the data into kernel space */ | |
0cb409d9 | 77 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
78 | if (ret < 0) |
79 | goto error; | |
1da177e4 | 80 | |
cf7f601c DH |
81 | description = NULL; |
82 | if (_description) { | |
aa9d4437 | 83 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
cf7f601c DH |
84 | if (IS_ERR(description)) { |
85 | ret = PTR_ERR(description); | |
86 | goto error; | |
87 | } | |
88 | if (!*description) { | |
89 | kfree(description); | |
90 | description = NULL; | |
a4e3b8d7 MZ |
91 | } else if ((description[0] == '.') && |
92 | (strncmp(type, "keyring", 7) == 0)) { | |
93 | ret = -EPERM; | |
94 | goto error2; | |
cf7f601c | 95 | } |
0cb409d9 | 96 | } |
1da177e4 LT |
97 | |
98 | /* pull the payload in if one was supplied */ | |
99 | payload = NULL; | |
100 | ||
38bbca6b | 101 | vm = false; |
1da177e4 LT |
102 | if (_payload) { |
103 | ret = -ENOMEM; | |
4f1c28d2 | 104 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
105 | if (!payload) { |
106 | if (plen <= PAGE_SIZE) | |
107 | goto error2; | |
108 | vm = true; | |
109 | payload = vmalloc(plen); | |
110 | if (!payload) | |
111 | goto error2; | |
112 | } | |
1da177e4 LT |
113 | |
114 | ret = -EFAULT; | |
115 | if (copy_from_user(payload, _payload, plen) != 0) | |
116 | goto error3; | |
117 | } | |
118 | ||
119 | /* find the target keyring (which must be writable) */ | |
f5895943 | 120 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
121 | if (IS_ERR(keyring_ref)) { |
122 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
123 | goto error3; |
124 | } | |
125 | ||
126 | /* create or update the requested key and add it to the target | |
127 | * keyring */ | |
664cceb0 | 128 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
129 | payload, plen, KEY_PERM_UNDEF, |
130 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
131 | if (!IS_ERR(key_ref)) { |
132 | ret = key_ref_to_ptr(key_ref)->serial; | |
133 | key_ref_put(key_ref); | |
1da177e4 LT |
134 | } |
135 | else { | |
664cceb0 | 136 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
137 | } |
138 | ||
664cceb0 | 139 | key_ref_put(keyring_ref); |
1da177e4 | 140 | error3: |
38bbca6b DH |
141 | if (!vm) |
142 | kfree(payload); | |
143 | else | |
144 | vfree(payload); | |
1da177e4 LT |
145 | error2: |
146 | kfree(description); | |
147 | error: | |
148 | return ret; | |
a8b17ed0 | 149 | } |
1da177e4 | 150 | |
1da177e4 | 151 | /* |
973c9f4f DH |
152 | * Search the process keyrings and keyring trees linked from those for a |
153 | * matching key. Keyrings must have appropriate Search permission to be | |
154 | * searched. | |
155 | * | |
156 | * If a key is found, it will be attached to the destination keyring if there's | |
157 | * one specified and the serial number of the key will be returned. | |
158 | * | |
159 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
160 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
161 | * passed to /sbin/request-key to aid with completing the request. If the | |
162 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 163 | */ |
1e7bfb21 HC |
164 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
165 | const char __user *, _description, | |
166 | const char __user *, _callout_info, | |
167 | key_serial_t, destringid) | |
1da177e4 LT |
168 | { |
169 | struct key_type *ktype; | |
664cceb0 DH |
170 | struct key *key; |
171 | key_ref_t dest_ref; | |
4a38e122 | 172 | size_t callout_len; |
1da177e4 | 173 | char type[32], *description, *callout_info; |
0cb409d9 | 174 | long ret; |
1da177e4 LT |
175 | |
176 | /* pull the type into kernel space */ | |
0cb409d9 | 177 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
178 | if (ret < 0) |
179 | goto error; | |
1260f801 | 180 | |
1da177e4 | 181 | /* pull the description into kernel space */ |
aa9d4437 | 182 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
183 | if (IS_ERR(description)) { |
184 | ret = PTR_ERR(description); | |
1da177e4 | 185 | goto error; |
0cb409d9 | 186 | } |
1da177e4 LT |
187 | |
188 | /* pull the callout info into kernel space */ | |
189 | callout_info = NULL; | |
4a38e122 | 190 | callout_len = 0; |
1da177e4 | 191 | if (_callout_info) { |
0cb409d9 DA |
192 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
193 | if (IS_ERR(callout_info)) { | |
194 | ret = PTR_ERR(callout_info); | |
1da177e4 | 195 | goto error2; |
0cb409d9 | 196 | } |
4a38e122 | 197 | callout_len = strlen(callout_info); |
1da177e4 LT |
198 | } |
199 | ||
200 | /* get the destination keyring if specified */ | |
664cceb0 | 201 | dest_ref = NULL; |
1da177e4 | 202 | if (destringid) { |
5593122e | 203 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 204 | KEY_NEED_WRITE); |
664cceb0 DH |
205 | if (IS_ERR(dest_ref)) { |
206 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
207 | goto error3; |
208 | } | |
209 | } | |
210 | ||
211 | /* find the key type */ | |
212 | ktype = key_type_lookup(type); | |
213 | if (IS_ERR(ktype)) { | |
214 | ret = PTR_ERR(ktype); | |
215 | goto error4; | |
216 | } | |
217 | ||
218 | /* do the search */ | |
4a38e122 DH |
219 | key = request_key_and_link(ktype, description, callout_info, |
220 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 221 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
222 | if (IS_ERR(key)) { |
223 | ret = PTR_ERR(key); | |
224 | goto error5; | |
225 | } | |
226 | ||
4aab1e89 DH |
227 | /* wait for the key to finish being constructed */ |
228 | ret = wait_for_key_construction(key, 1); | |
229 | if (ret < 0) | |
230 | goto error6; | |
231 | ||
1da177e4 LT |
232 | ret = key->serial; |
233 | ||
4aab1e89 | 234 | error6: |
3e30148c | 235 | key_put(key); |
c5b60b5e | 236 | error5: |
1da177e4 | 237 | key_type_put(ktype); |
c5b60b5e | 238 | error4: |
664cceb0 | 239 | key_ref_put(dest_ref); |
c5b60b5e | 240 | error3: |
1da177e4 | 241 | kfree(callout_info); |
c5b60b5e | 242 | error2: |
1da177e4 | 243 | kfree(description); |
c5b60b5e | 244 | error: |
1da177e4 | 245 | return ret; |
a8b17ed0 | 246 | } |
1da177e4 | 247 | |
1da177e4 | 248 | /* |
973c9f4f DH |
249 | * Get the ID of the specified process keyring. |
250 | * | |
251 | * The requested keyring must have search permission to be found. | |
252 | * | |
253 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
254 | */ |
255 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
256 | { | |
664cceb0 | 257 | key_ref_t key_ref; |
5593122e | 258 | unsigned long lflags; |
1da177e4 LT |
259 | long ret; |
260 | ||
5593122e | 261 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
f5895943 | 262 | key_ref = lookup_user_key(id, lflags, KEY_NEED_SEARCH); |
664cceb0 DH |
263 | if (IS_ERR(key_ref)) { |
264 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
265 | goto error; |
266 | } | |
267 | ||
664cceb0 DH |
268 | ret = key_ref_to_ptr(key_ref)->serial; |
269 | key_ref_put(key_ref); | |
c5b60b5e | 270 | error: |
1da177e4 | 271 | return ret; |
973c9f4f | 272 | } |
1da177e4 | 273 | |
1da177e4 | 274 | /* |
973c9f4f DH |
275 | * Join a (named) session keyring. |
276 | * | |
277 | * Create and join an anonymous session keyring or join a named session | |
278 | * keyring, creating it if necessary. A named session keyring must have Search | |
279 | * permission for it to be joined. Session keyrings without this permit will | |
280 | * be skipped over. | |
281 | * | |
282 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
283 | */ |
284 | long keyctl_join_session_keyring(const char __user *_name) | |
285 | { | |
286 | char *name; | |
0cb409d9 | 287 | long ret; |
1da177e4 LT |
288 | |
289 | /* fetch the name from userspace */ | |
290 | name = NULL; | |
291 | if (_name) { | |
aa9d4437 | 292 | name = strndup_user(_name, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
293 | if (IS_ERR(name)) { |
294 | ret = PTR_ERR(name); | |
1da177e4 | 295 | goto error; |
0cb409d9 | 296 | } |
1da177e4 LT |
297 | } |
298 | ||
299 | /* join the session */ | |
300 | ret = join_session_keyring(name); | |
0d54ee1c | 301 | kfree(name); |
1da177e4 | 302 | |
c5b60b5e | 303 | error: |
1da177e4 | 304 | return ret; |
a8b17ed0 | 305 | } |
1da177e4 | 306 | |
1da177e4 | 307 | /* |
973c9f4f DH |
308 | * Update a key's data payload from the given data. |
309 | * | |
310 | * The key must grant the caller Write permission and the key type must support | |
311 | * updating for this to work. A negative key can be positively instantiated | |
312 | * with this call. | |
313 | * | |
314 | * If successful, 0 will be returned. If the key type does not support | |
315 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
316 | */ |
317 | long keyctl_update_key(key_serial_t id, | |
318 | const void __user *_payload, | |
319 | size_t plen) | |
320 | { | |
664cceb0 | 321 | key_ref_t key_ref; |
1da177e4 LT |
322 | void *payload; |
323 | long ret; | |
324 | ||
325 | ret = -EINVAL; | |
326 | if (plen > PAGE_SIZE) | |
327 | goto error; | |
328 | ||
329 | /* pull the payload in if one was supplied */ | |
330 | payload = NULL; | |
331 | if (_payload) { | |
332 | ret = -ENOMEM; | |
333 | payload = kmalloc(plen, GFP_KERNEL); | |
334 | if (!payload) | |
335 | goto error; | |
336 | ||
337 | ret = -EFAULT; | |
338 | if (copy_from_user(payload, _payload, plen) != 0) | |
339 | goto error2; | |
340 | } | |
341 | ||
342 | /* find the target key (which must be writable) */ | |
f5895943 | 343 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
344 | if (IS_ERR(key_ref)) { |
345 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
346 | goto error2; |
347 | } | |
348 | ||
349 | /* update the key */ | |
664cceb0 | 350 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 351 | |
664cceb0 | 352 | key_ref_put(key_ref); |
c5b60b5e | 353 | error2: |
1da177e4 | 354 | kfree(payload); |
c5b60b5e | 355 | error: |
1da177e4 | 356 | return ret; |
a8b17ed0 | 357 | } |
1da177e4 | 358 | |
1da177e4 | 359 | /* |
973c9f4f DH |
360 | * Revoke a key. |
361 | * | |
362 | * The key must be grant the caller Write or Setattr permission for this to | |
363 | * work. The key type should give up its quota claim when revoked. The key | |
364 | * and any links to the key will be automatically garbage collected after a | |
365 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
366 | * | |
367 | * If successful, 0 is returned. | |
1da177e4 LT |
368 | */ |
369 | long keyctl_revoke_key(key_serial_t id) | |
370 | { | |
664cceb0 | 371 | key_ref_t key_ref; |
1da177e4 LT |
372 | long ret; |
373 | ||
f5895943 | 374 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
375 | if (IS_ERR(key_ref)) { |
376 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
377 | if (ret != -EACCES) |
378 | goto error; | |
f5895943 | 379 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
0c2c9a3f DH |
380 | if (IS_ERR(key_ref)) { |
381 | ret = PTR_ERR(key_ref); | |
382 | goto error; | |
383 | } | |
1da177e4 LT |
384 | } |
385 | ||
664cceb0 | 386 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
387 | ret = 0; |
388 | ||
664cceb0 | 389 | key_ref_put(key_ref); |
c5b60b5e | 390 | error: |
1260f801 | 391 | return ret; |
a8b17ed0 | 392 | } |
1da177e4 | 393 | |
fd75815f DH |
394 | /* |
395 | * Invalidate a key. | |
396 | * | |
397 | * The key must be grant the caller Invalidate permission for this to work. | |
398 | * The key and any links to the key will be automatically garbage collected | |
399 | * immediately. | |
400 | * | |
401 | * If successful, 0 is returned. | |
402 | */ | |
403 | long keyctl_invalidate_key(key_serial_t id) | |
404 | { | |
405 | key_ref_t key_ref; | |
406 | long ret; | |
407 | ||
408 | kenter("%d", id); | |
409 | ||
f5895943 | 410 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
fd75815f DH |
411 | if (IS_ERR(key_ref)) { |
412 | ret = PTR_ERR(key_ref); | |
0c7774ab DH |
413 | |
414 | /* Root is permitted to invalidate certain special keys */ | |
415 | if (capable(CAP_SYS_ADMIN)) { | |
416 | key_ref = lookup_user_key(id, 0, 0); | |
417 | if (IS_ERR(key_ref)) | |
418 | goto error; | |
419 | if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, | |
420 | &key_ref_to_ptr(key_ref)->flags)) | |
421 | goto invalidate; | |
422 | goto error_put; | |
423 | } | |
424 | ||
fd75815f DH |
425 | goto error; |
426 | } | |
427 | ||
0c7774ab | 428 | invalidate: |
fd75815f DH |
429 | key_invalidate(key_ref_to_ptr(key_ref)); |
430 | ret = 0; | |
0c7774ab | 431 | error_put: |
fd75815f DH |
432 | key_ref_put(key_ref); |
433 | error: | |
434 | kleave(" = %ld", ret); | |
435 | return ret; | |
436 | } | |
437 | ||
1da177e4 | 438 | /* |
973c9f4f DH |
439 | * Clear the specified keyring, creating an empty process keyring if one of the |
440 | * special keyring IDs is used. | |
441 | * | |
442 | * The keyring must grant the caller Write permission for this to work. If | |
443 | * successful, 0 will be returned. | |
1da177e4 LT |
444 | */ |
445 | long keyctl_keyring_clear(key_serial_t ringid) | |
446 | { | |
664cceb0 | 447 | key_ref_t keyring_ref; |
1da177e4 LT |
448 | long ret; |
449 | ||
f5895943 | 450 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
451 | if (IS_ERR(keyring_ref)) { |
452 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
453 | |
454 | /* Root is permitted to invalidate certain special keyrings */ | |
455 | if (capable(CAP_SYS_ADMIN)) { | |
456 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
457 | if (IS_ERR(keyring_ref)) | |
458 | goto error; | |
459 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
460 | &key_ref_to_ptr(keyring_ref)->flags)) | |
461 | goto clear; | |
462 | goto error_put; | |
463 | } | |
464 | ||
1da177e4 LT |
465 | goto error; |
466 | } | |
467 | ||
700920eb | 468 | clear: |
664cceb0 | 469 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 470 | error_put: |
664cceb0 | 471 | key_ref_put(keyring_ref); |
c5b60b5e | 472 | error: |
1da177e4 | 473 | return ret; |
a8b17ed0 | 474 | } |
1da177e4 | 475 | |
1da177e4 | 476 | /* |
973c9f4f DH |
477 | * Create a link from a keyring to a key if there's no matching key in the |
478 | * keyring, otherwise replace the link to the matching key with a link to the | |
479 | * new key. | |
480 | * | |
481 | * The key must grant the caller Link permission and the the keyring must grant | |
482 | * the caller Write permission. Furthermore, if an additional link is created, | |
483 | * the keyring's quota will be extended. | |
484 | * | |
485 | * If successful, 0 will be returned. | |
1da177e4 LT |
486 | */ |
487 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
488 | { | |
664cceb0 | 489 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
490 | long ret; |
491 | ||
f5895943 | 492 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
493 | if (IS_ERR(keyring_ref)) { |
494 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
495 | goto error; |
496 | } | |
497 | ||
f5895943 | 498 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
664cceb0 DH |
499 | if (IS_ERR(key_ref)) { |
500 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
501 | goto error2; |
502 | } | |
503 | ||
664cceb0 | 504 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 505 | |
664cceb0 | 506 | key_ref_put(key_ref); |
c5b60b5e | 507 | error2: |
664cceb0 | 508 | key_ref_put(keyring_ref); |
c5b60b5e | 509 | error: |
1da177e4 | 510 | return ret; |
a8b17ed0 | 511 | } |
1da177e4 | 512 | |
1da177e4 | 513 | /* |
973c9f4f DH |
514 | * Unlink a key from a keyring. |
515 | * | |
516 | * The keyring must grant the caller Write permission for this to work; the key | |
517 | * itself need not grant the caller anything. If the last link to a key is | |
518 | * removed then that key will be scheduled for destruction. | |
519 | * | |
520 | * If successful, 0 will be returned. | |
1da177e4 LT |
521 | */ |
522 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
523 | { | |
664cceb0 | 524 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
525 | long ret; |
526 | ||
f5895943 | 527 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
664cceb0 DH |
528 | if (IS_ERR(keyring_ref)) { |
529 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
530 | goto error; |
531 | } | |
532 | ||
5593122e | 533 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
534 | if (IS_ERR(key_ref)) { |
535 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
536 | goto error2; |
537 | } | |
538 | ||
664cceb0 | 539 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 540 | |
664cceb0 | 541 | key_ref_put(key_ref); |
c5b60b5e | 542 | error2: |
664cceb0 | 543 | key_ref_put(keyring_ref); |
c5b60b5e | 544 | error: |
1da177e4 | 545 | return ret; |
a8b17ed0 | 546 | } |
1da177e4 | 547 | |
1da177e4 | 548 | /* |
973c9f4f DH |
549 | * Return a description of a key to userspace. |
550 | * | |
551 | * The key must grant the caller View permission for this to work. | |
552 | * | |
553 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
554 | * in the following way: | |
555 | * | |
1da177e4 | 556 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
557 | * |
558 | * If successful, we return the amount of description available, irrespective | |
559 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
560 | */ |
561 | long keyctl_describe_key(key_serial_t keyid, | |
562 | char __user *buffer, | |
563 | size_t buflen) | |
564 | { | |
3e30148c | 565 | struct key *key, *instkey; |
664cceb0 | 566 | key_ref_t key_ref; |
aa9d4437 | 567 | char *infobuf; |
1da177e4 | 568 | long ret; |
aa9d4437 | 569 | int desclen, infolen; |
1da177e4 | 570 | |
f5895943 | 571 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
664cceb0 | 572 | if (IS_ERR(key_ref)) { |
3e30148c DH |
573 | /* viewing a key under construction is permitted if we have the |
574 | * authorisation token handy */ | |
664cceb0 | 575 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
576 | instkey = key_get_instantiation_authkey(keyid); |
577 | if (!IS_ERR(instkey)) { | |
578 | key_put(instkey); | |
8bbf4976 | 579 | key_ref = lookup_user_key(keyid, |
5593122e DH |
580 | KEY_LOOKUP_PARTIAL, |
581 | 0); | |
664cceb0 | 582 | if (!IS_ERR(key_ref)) |
3e30148c DH |
583 | goto okay; |
584 | } | |
585 | } | |
586 | ||
664cceb0 | 587 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
588 | goto error; |
589 | } | |
590 | ||
3e30148c | 591 | okay: |
664cceb0 | 592 | key = key_ref_to_ptr(key_ref); |
aa9d4437 | 593 | desclen = strlen(key->description); |
664cceb0 | 594 | |
aa9d4437 DH |
595 | /* calculate how much information we're going to return */ |
596 | ret = -ENOMEM; | |
597 | infobuf = kasprintf(GFP_KERNEL, | |
598 | "%s;%d;%d;%08x;", | |
599 | key->type->name, | |
600 | from_kuid_munged(current_user_ns(), key->uid), | |
601 | from_kgid_munged(current_user_ns(), key->gid), | |
602 | key->perm); | |
603 | if (!infobuf) | |
604 | goto error2; | |
605 | infolen = strlen(infobuf); | |
606 | ret = infolen + desclen + 1; | |
1da177e4 LT |
607 | |
608 | /* consider returning the data */ | |
aa9d4437 DH |
609 | if (buffer && buflen >= ret) { |
610 | if (copy_to_user(buffer, infobuf, infolen) != 0 || | |
611 | copy_to_user(buffer + infolen, key->description, | |
612 | desclen + 1) != 0) | |
1da177e4 LT |
613 | ret = -EFAULT; |
614 | } | |
615 | ||
aa9d4437 | 616 | kfree(infobuf); |
c5b60b5e | 617 | error2: |
664cceb0 | 618 | key_ref_put(key_ref); |
c5b60b5e | 619 | error: |
1da177e4 | 620 | return ret; |
a8b17ed0 | 621 | } |
1da177e4 | 622 | |
1da177e4 | 623 | /* |
973c9f4f DH |
624 | * Search the specified keyring and any keyrings it links to for a matching |
625 | * key. Only keyrings that grant the caller Search permission will be searched | |
626 | * (this includes the starting keyring). Only keys with Search permission can | |
627 | * be found. | |
628 | * | |
629 | * If successful, the found key will be linked to the destination keyring if | |
630 | * supplied and the key has Link permission, and the found key ID will be | |
631 | * returned. | |
1da177e4 LT |
632 | */ |
633 | long keyctl_keyring_search(key_serial_t ringid, | |
634 | const char __user *_type, | |
635 | const char __user *_description, | |
636 | key_serial_t destringid) | |
637 | { | |
638 | struct key_type *ktype; | |
664cceb0 | 639 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 640 | char type[32], *description; |
0cb409d9 | 641 | long ret; |
1da177e4 LT |
642 | |
643 | /* pull the type and description into kernel space */ | |
0cb409d9 | 644 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
645 | if (ret < 0) |
646 | goto error; | |
1da177e4 | 647 | |
aa9d4437 | 648 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
649 | if (IS_ERR(description)) { |
650 | ret = PTR_ERR(description); | |
1da177e4 | 651 | goto error; |
0cb409d9 | 652 | } |
1da177e4 LT |
653 | |
654 | /* get the keyring at which to begin the search */ | |
f5895943 | 655 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
664cceb0 DH |
656 | if (IS_ERR(keyring_ref)) { |
657 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
658 | goto error2; |
659 | } | |
660 | ||
661 | /* get the destination keyring if specified */ | |
664cceb0 | 662 | dest_ref = NULL; |
1da177e4 | 663 | if (destringid) { |
5593122e | 664 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 665 | KEY_NEED_WRITE); |
664cceb0 DH |
666 | if (IS_ERR(dest_ref)) { |
667 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
668 | goto error3; |
669 | } | |
670 | } | |
671 | ||
672 | /* find the key type */ | |
673 | ktype = key_type_lookup(type); | |
674 | if (IS_ERR(ktype)) { | |
675 | ret = PTR_ERR(ktype); | |
676 | goto error4; | |
677 | } | |
678 | ||
679 | /* do the search */ | |
664cceb0 DH |
680 | key_ref = keyring_search(keyring_ref, ktype, description); |
681 | if (IS_ERR(key_ref)) { | |
682 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
683 | |
684 | /* treat lack or presence of a negative key the same */ | |
685 | if (ret == -EAGAIN) | |
686 | ret = -ENOKEY; | |
687 | goto error5; | |
688 | } | |
689 | ||
690 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 691 | if (dest_ref) { |
f5895943 | 692 | ret = key_permission(key_ref, KEY_NEED_LINK); |
29db9190 | 693 | if (ret < 0) |
1da177e4 LT |
694 | goto error6; |
695 | ||
664cceb0 | 696 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
697 | if (ret < 0) |
698 | goto error6; | |
699 | } | |
700 | ||
664cceb0 | 701 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 702 | |
c5b60b5e | 703 | error6: |
664cceb0 | 704 | key_ref_put(key_ref); |
c5b60b5e | 705 | error5: |
1da177e4 | 706 | key_type_put(ktype); |
c5b60b5e | 707 | error4: |
664cceb0 | 708 | key_ref_put(dest_ref); |
c5b60b5e | 709 | error3: |
664cceb0 | 710 | key_ref_put(keyring_ref); |
c5b60b5e | 711 | error2: |
1da177e4 | 712 | kfree(description); |
c5b60b5e | 713 | error: |
1da177e4 | 714 | return ret; |
a8b17ed0 | 715 | } |
1da177e4 | 716 | |
1da177e4 | 717 | /* |
973c9f4f DH |
718 | * Read a key's payload. |
719 | * | |
720 | * The key must either grant the caller Read permission, or it must grant the | |
721 | * caller Search permission when searched for from the process keyrings. | |
722 | * | |
723 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
724 | * is provided, and return the amount of data that is available in the key, | |
725 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
726 | */ |
727 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
728 | { | |
664cceb0 DH |
729 | struct key *key; |
730 | key_ref_t key_ref; | |
1da177e4 LT |
731 | long ret; |
732 | ||
733 | /* find the key first */ | |
5593122e | 734 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
735 | if (IS_ERR(key_ref)) { |
736 | ret = -ENOKEY; | |
737 | goto error; | |
1da177e4 LT |
738 | } |
739 | ||
664cceb0 DH |
740 | key = key_ref_to_ptr(key_ref); |
741 | ||
742 | /* see if we can read it directly */ | |
f5895943 | 743 | ret = key_permission(key_ref, KEY_NEED_READ); |
29db9190 | 744 | if (ret == 0) |
664cceb0 | 745 | goto can_read_key; |
29db9190 DH |
746 | if (ret != -EACCES) |
747 | goto error; | |
664cceb0 DH |
748 | |
749 | /* we can't; see if it's searchable from this process's keyrings | |
750 | * - we automatically take account of the fact that it may be | |
751 | * dangling off an instantiation key | |
752 | */ | |
753 | if (!is_key_possessed(key_ref)) { | |
754 | ret = -EACCES; | |
755 | goto error2; | |
756 | } | |
1da177e4 LT |
757 | |
758 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 759 | can_read_key: |
1da177e4 LT |
760 | ret = key_validate(key); |
761 | if (ret == 0) { | |
762 | ret = -EOPNOTSUPP; | |
763 | if (key->type->read) { | |
764 | /* read the data with the semaphore held (since we | |
765 | * might sleep) */ | |
766 | down_read(&key->sem); | |
767 | ret = key->type->read(key, buffer, buflen); | |
768 | up_read(&key->sem); | |
769 | } | |
770 | } | |
771 | ||
c5b60b5e | 772 | error2: |
1da177e4 | 773 | key_put(key); |
c5b60b5e | 774 | error: |
1da177e4 | 775 | return ret; |
a8b17ed0 | 776 | } |
1da177e4 | 777 | |
1da177e4 | 778 | /* |
973c9f4f DH |
779 | * Change the ownership of a key |
780 | * | |
781 | * The key must grant the caller Setattr permission for this to work, though | |
782 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
783 | * for the GID to be changed to a group the caller is not a member of, the | |
784 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
785 | * attribute is not changed. | |
786 | * | |
787 | * If the UID is to be changed, the new user must have sufficient quota to | |
788 | * accept the key. The quota deduction will be removed from the old user to | |
789 | * the new user should the attribute be changed. | |
790 | * | |
791 | * If successful, 0 will be returned. | |
1da177e4 | 792 | */ |
9a56c2db | 793 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 794 | { |
5801649d | 795 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 796 | struct key *key; |
664cceb0 | 797 | key_ref_t key_ref; |
1da177e4 | 798 | long ret; |
9a56c2db EB |
799 | kuid_t uid; |
800 | kgid_t gid; | |
801 | ||
802 | uid = make_kuid(current_user_ns(), user); | |
803 | gid = make_kgid(current_user_ns(), group); | |
804 | ret = -EINVAL; | |
805 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
806 | goto error; | |
807 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
808 | goto error; | |
1da177e4 LT |
809 | |
810 | ret = 0; | |
9a56c2db | 811 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
812 | goto error; |
813 | ||
5593122e | 814 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 815 | KEY_NEED_SETATTR); |
664cceb0 DH |
816 | if (IS_ERR(key_ref)) { |
817 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
818 | goto error; |
819 | } | |
820 | ||
664cceb0 DH |
821 | key = key_ref_to_ptr(key_ref); |
822 | ||
1da177e4 LT |
823 | /* make the changes with the locks held to prevent chown/chown races */ |
824 | ret = -EACCES; | |
825 | down_write(&key->sem); | |
1da177e4 LT |
826 | |
827 | if (!capable(CAP_SYS_ADMIN)) { | |
828 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 829 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 830 | goto error_put; |
1da177e4 LT |
831 | |
832 | /* only the sysadmin can set the key's GID to a group other | |
833 | * than one of those that the current process subscribes to */ | |
9a56c2db | 834 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 835 | goto error_put; |
1da177e4 LT |
836 | } |
837 | ||
5801649d | 838 | /* change the UID */ |
9a56c2db | 839 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 840 | ret = -ENOMEM; |
9a56c2db | 841 | newowner = key_user_lookup(uid); |
5801649d FT |
842 | if (!newowner) |
843 | goto error_put; | |
844 | ||
845 | /* transfer the quota burden to the new user */ | |
846 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 847 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 848 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 849 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
850 | key_quota_root_maxbytes : key_quota_maxbytes; |
851 | ||
5801649d | 852 | spin_lock(&newowner->lock); |
0b77f5bf DH |
853 | if (newowner->qnkeys + 1 >= maxkeys || |
854 | newowner->qnbytes + key->quotalen >= maxbytes || | |
855 | newowner->qnbytes + key->quotalen < | |
856 | newowner->qnbytes) | |
5801649d FT |
857 | goto quota_overrun; |
858 | ||
859 | newowner->qnkeys++; | |
860 | newowner->qnbytes += key->quotalen; | |
861 | spin_unlock(&newowner->lock); | |
862 | ||
863 | spin_lock(&key->user->lock); | |
864 | key->user->qnkeys--; | |
865 | key->user->qnbytes -= key->quotalen; | |
866 | spin_unlock(&key->user->lock); | |
867 | } | |
868 | ||
869 | atomic_dec(&key->user->nkeys); | |
870 | atomic_inc(&newowner->nkeys); | |
871 | ||
872 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
873 | atomic_dec(&key->user->nikeys); | |
874 | atomic_inc(&newowner->nikeys); | |
875 | } | |
876 | ||
877 | zapowner = key->user; | |
878 | key->user = newowner; | |
879 | key->uid = uid; | |
1da177e4 LT |
880 | } |
881 | ||
882 | /* change the GID */ | |
9a56c2db | 883 | if (group != (gid_t) -1) |
1da177e4 LT |
884 | key->gid = gid; |
885 | ||
886 | ret = 0; | |
887 | ||
5801649d | 888 | error_put: |
1da177e4 LT |
889 | up_write(&key->sem); |
890 | key_put(key); | |
5801649d FT |
891 | if (zapowner) |
892 | key_user_put(zapowner); | |
893 | error: | |
1da177e4 LT |
894 | return ret; |
895 | ||
5801649d FT |
896 | quota_overrun: |
897 | spin_unlock(&newowner->lock); | |
898 | zapowner = newowner; | |
899 | ret = -EDQUOT; | |
900 | goto error_put; | |
a8b17ed0 | 901 | } |
5801649d | 902 | |
1da177e4 | 903 | /* |
973c9f4f DH |
904 | * Change the permission mask on a key. |
905 | * | |
906 | * The key must grant the caller Setattr permission for this to work, though | |
907 | * the key need not be fully instantiated yet. If the caller does not have | |
908 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
909 | */ |
910 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
911 | { | |
912 | struct key *key; | |
664cceb0 | 913 | key_ref_t key_ref; |
1da177e4 LT |
914 | long ret; |
915 | ||
916 | ret = -EINVAL; | |
664cceb0 | 917 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
918 | goto error; |
919 | ||
5593122e | 920 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 921 | KEY_NEED_SETATTR); |
664cceb0 DH |
922 | if (IS_ERR(key_ref)) { |
923 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
924 | goto error; |
925 | } | |
926 | ||
664cceb0 DH |
927 | key = key_ref_to_ptr(key_ref); |
928 | ||
76d8aeab | 929 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
930 | ret = -EACCES; |
931 | down_write(&key->sem); | |
1da177e4 | 932 | |
76d8aeab | 933 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 934 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
935 | key->perm = perm; |
936 | ret = 0; | |
937 | } | |
1da177e4 | 938 | |
1da177e4 LT |
939 | up_write(&key->sem); |
940 | key_put(key); | |
76d8aeab | 941 | error: |
1da177e4 | 942 | return ret; |
a8b17ed0 | 943 | } |
1da177e4 | 944 | |
8bbf4976 | 945 | /* |
973c9f4f DH |
946 | * Get the destination keyring for instantiation and check that the caller has |
947 | * Write permission on it. | |
8bbf4976 DH |
948 | */ |
949 | static long get_instantiation_keyring(key_serial_t ringid, | |
950 | struct request_key_auth *rka, | |
951 | struct key **_dest_keyring) | |
952 | { | |
953 | key_ref_t dkref; | |
954 | ||
eca1bf5b DH |
955 | *_dest_keyring = NULL; |
956 | ||
8bbf4976 | 957 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 958 | if (ringid == 0) |
8bbf4976 | 959 | return 0; |
8bbf4976 DH |
960 | |
961 | /* if a specific keyring is nominated by ID, then use that */ | |
962 | if (ringid > 0) { | |
f5895943 | 963 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
8bbf4976 DH |
964 | if (IS_ERR(dkref)) |
965 | return PTR_ERR(dkref); | |
966 | *_dest_keyring = key_ref_to_ptr(dkref); | |
967 | return 0; | |
968 | } | |
969 | ||
970 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
971 | return -EINVAL; | |
972 | ||
973 | /* otherwise specify the destination keyring recorded in the | |
974 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
975 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 976 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
977 | return 0; |
978 | } | |
979 | ||
980 | return -ENOKEY; | |
981 | } | |
982 | ||
d84f4f99 | 983 | /* |
973c9f4f | 984 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
985 | */ |
986 | static int keyctl_change_reqkey_auth(struct key *key) | |
987 | { | |
988 | struct cred *new; | |
989 | ||
990 | new = prepare_creds(); | |
991 | if (!new) | |
992 | return -ENOMEM; | |
993 | ||
994 | key_put(new->request_key_auth); | |
995 | new->request_key_auth = key_get(key); | |
996 | ||
997 | return commit_creds(new); | |
998 | } | |
999 | ||
ee009e4a DH |
1000 | /* |
1001 | * Copy the iovec data from userspace | |
1002 | */ | |
1003 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
1004 | unsigned ioc) | |
1005 | { | |
1006 | for (; ioc > 0; ioc--) { | |
1007 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
1008 | return -EFAULT; | |
1009 | buffer += iov->iov_len; | |
1010 | iov++; | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1da177e4 | 1015 | /* |
973c9f4f DH |
1016 | * Instantiate a key with the specified payload and link the key into the |
1017 | * destination keyring if one is given. | |
1018 | * | |
1019 | * The caller must have the appropriate instantiation permit set for this to | |
1020 | * work (see keyctl_assume_authority). No other permissions are required. | |
1021 | * | |
1022 | * If successful, 0 will be returned. | |
1da177e4 | 1023 | */ |
ee009e4a DH |
1024 | long keyctl_instantiate_key_common(key_serial_t id, |
1025 | const struct iovec *payload_iov, | |
1026 | unsigned ioc, | |
1027 | size_t plen, | |
1028 | key_serial_t ringid) | |
1da177e4 | 1029 | { |
d84f4f99 | 1030 | const struct cred *cred = current_cred(); |
3e30148c | 1031 | struct request_key_auth *rka; |
8bbf4976 | 1032 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1033 | void *payload; |
1034 | long ret; | |
38bbca6b | 1035 | bool vm = false; |
1da177e4 | 1036 | |
d84f4f99 DH |
1037 | kenter("%d,,%zu,%d", id, plen, ringid); |
1038 | ||
1da177e4 | 1039 | ret = -EINVAL; |
38bbca6b | 1040 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1041 | goto error; |
1042 | ||
b5f545c8 DH |
1043 | /* the appropriate instantiation authorisation key must have been |
1044 | * assumed before calling this */ | |
1045 | ret = -EPERM; | |
d84f4f99 | 1046 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1047 | if (!instkey) |
1048 | goto error; | |
1049 | ||
1050 | rka = instkey->payload.data; | |
1051 | if (rka->target_key->serial != id) | |
1052 | goto error; | |
1053 | ||
1da177e4 LT |
1054 | /* pull the payload in if one was supplied */ |
1055 | payload = NULL; | |
1056 | ||
ee009e4a | 1057 | if (payload_iov) { |
1da177e4 LT |
1058 | ret = -ENOMEM; |
1059 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1060 | if (!payload) { |
1061 | if (plen <= PAGE_SIZE) | |
1062 | goto error; | |
1063 | vm = true; | |
1064 | payload = vmalloc(plen); | |
1065 | if (!payload) | |
1066 | goto error; | |
1067 | } | |
1da177e4 | 1068 | |
ee009e4a DH |
1069 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
1070 | if (ret < 0) | |
1da177e4 LT |
1071 | goto error2; |
1072 | } | |
1073 | ||
3e30148c DH |
1074 | /* find the destination keyring amongst those belonging to the |
1075 | * requesting task */ | |
8bbf4976 DH |
1076 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1077 | if (ret < 0) | |
1078 | goto error2; | |
1da177e4 LT |
1079 | |
1080 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1081 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1082 | dest_keyring, instkey); |
1da177e4 | 1083 | |
8bbf4976 | 1084 | key_put(dest_keyring); |
b5f545c8 DH |
1085 | |
1086 | /* discard the assumed authority if it's just been disabled by | |
1087 | * instantiation of the key */ | |
d84f4f99 DH |
1088 | if (ret == 0) |
1089 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1090 | |
1091 | error2: | |
38bbca6b DH |
1092 | if (!vm) |
1093 | kfree(payload); | |
1094 | else | |
1095 | vfree(payload); | |
b5f545c8 | 1096 | error: |
1da177e4 | 1097 | return ret; |
a8b17ed0 | 1098 | } |
1da177e4 | 1099 | |
ee009e4a DH |
1100 | /* |
1101 | * Instantiate a key with the specified payload and link the key into the | |
1102 | * destination keyring if one is given. | |
1103 | * | |
1104 | * The caller must have the appropriate instantiation permit set for this to | |
1105 | * work (see keyctl_assume_authority). No other permissions are required. | |
1106 | * | |
1107 | * If successful, 0 will be returned. | |
1108 | */ | |
1109 | long keyctl_instantiate_key(key_serial_t id, | |
1110 | const void __user *_payload, | |
1111 | size_t plen, | |
1112 | key_serial_t ringid) | |
1113 | { | |
1114 | if (_payload && plen) { | |
1115 | struct iovec iov[1] = { | |
1116 | [0].iov_base = (void __user *)_payload, | |
1117 | [0].iov_len = plen | |
1118 | }; | |
1119 | ||
1120 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1121 | } | |
1122 | ||
1123 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Instantiate a key with the specified multipart payload and link the key into | |
1128 | * the destination keyring if one is given. | |
1129 | * | |
1130 | * The caller must have the appropriate instantiation permit set for this to | |
1131 | * work (see keyctl_assume_authority). No other permissions are required. | |
1132 | * | |
1133 | * If successful, 0 will be returned. | |
1134 | */ | |
1135 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1136 | const struct iovec __user *_payload_iov, | |
1137 | unsigned ioc, | |
1138 | key_serial_t ringid) | |
1139 | { | |
1140 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1141 | long ret; | |
1142 | ||
423b9788 | 1143 | if (!_payload_iov || !ioc) |
ee009e4a DH |
1144 | goto no_payload; |
1145 | ||
1146 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
ac34ebb3 | 1147 | ARRAY_SIZE(iovstack), iovstack, &iov); |
ee009e4a | 1148 | if (ret < 0) |
a84a9219 | 1149 | goto err; |
ee009e4a DH |
1150 | if (ret == 0) |
1151 | goto no_payload_free; | |
1152 | ||
1153 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
a84a9219 | 1154 | err: |
ee009e4a DH |
1155 | if (iov != iovstack) |
1156 | kfree(iov); | |
1157 | return ret; | |
1158 | ||
1159 | no_payload_free: | |
1160 | if (iov != iovstack) | |
1161 | kfree(iov); | |
1162 | no_payload: | |
1163 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1164 | } | |
1165 | ||
1da177e4 | 1166 | /* |
973c9f4f DH |
1167 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1168 | * the key into the destination keyring if one is given. | |
1169 | * | |
1170 | * The caller must have the appropriate instantiation permit set for this to | |
1171 | * work (see keyctl_assume_authority). No other permissions are required. | |
1172 | * | |
1173 | * The key and any links to the key will be automatically garbage collected | |
1174 | * after the timeout expires. | |
1175 | * | |
1176 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1177 | * them to return -ENOKEY until the negative key expires. | |
1178 | * | |
1179 | * If successful, 0 will be returned. | |
1da177e4 LT |
1180 | */ |
1181 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1182 | { |
1183 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1188 | * code and link the key into the destination keyring if one is given. | |
1189 | * | |
1190 | * The caller must have the appropriate instantiation permit set for this to | |
1191 | * work (see keyctl_assume_authority). No other permissions are required. | |
1192 | * | |
1193 | * The key and any links to the key will be automatically garbage collected | |
1194 | * after the timeout expires. | |
1195 | * | |
1196 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1197 | * them to return the specified error code until the negative key expires. | |
1198 | * | |
1199 | * If successful, 0 will be returned. | |
1200 | */ | |
1201 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1202 | key_serial_t ringid) | |
1da177e4 | 1203 | { |
d84f4f99 | 1204 | const struct cred *cred = current_cred(); |
3e30148c | 1205 | struct request_key_auth *rka; |
8bbf4976 | 1206 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1207 | long ret; |
1208 | ||
fdd1b945 DH |
1209 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1210 | ||
1211 | /* must be a valid error code and mustn't be a kernel special */ | |
1212 | if (error <= 0 || | |
1213 | error >= MAX_ERRNO || | |
1214 | error == ERESTARTSYS || | |
1215 | error == ERESTARTNOINTR || | |
1216 | error == ERESTARTNOHAND || | |
1217 | error == ERESTART_RESTARTBLOCK) | |
1218 | return -EINVAL; | |
d84f4f99 | 1219 | |
b5f545c8 DH |
1220 | /* the appropriate instantiation authorisation key must have been |
1221 | * assumed before calling this */ | |
1222 | ret = -EPERM; | |
d84f4f99 | 1223 | instkey = cred->request_key_auth; |
b5f545c8 | 1224 | if (!instkey) |
1da177e4 | 1225 | goto error; |
1da177e4 | 1226 | |
3e30148c | 1227 | rka = instkey->payload.data; |
b5f545c8 DH |
1228 | if (rka->target_key->serial != id) |
1229 | goto error; | |
3e30148c | 1230 | |
1da177e4 LT |
1231 | /* find the destination keyring if present (which must also be |
1232 | * writable) */ | |
8bbf4976 DH |
1233 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1234 | if (ret < 0) | |
1235 | goto error; | |
1da177e4 LT |
1236 | |
1237 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1238 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1239 | dest_keyring, instkey); |
1da177e4 | 1240 | |
8bbf4976 | 1241 | key_put(dest_keyring); |
b5f545c8 DH |
1242 | |
1243 | /* discard the assumed authority if it's just been disabled by | |
1244 | * instantiation of the key */ | |
d84f4f99 DH |
1245 | if (ret == 0) |
1246 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1247 | |
1248 | error: | |
1da177e4 | 1249 | return ret; |
a8b17ed0 | 1250 | } |
1da177e4 | 1251 | |
3e30148c | 1252 | /* |
973c9f4f DH |
1253 | * Read or set the default keyring in which request_key() will cache keys and |
1254 | * return the old setting. | |
1255 | * | |
1256 | * If a process keyring is specified then this will be created if it doesn't | |
1257 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1258 | */ |
1259 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1260 | { | |
d84f4f99 DH |
1261 | struct cred *new; |
1262 | int ret, old_setting; | |
1263 | ||
1264 | old_setting = current_cred_xxx(jit_keyring); | |
1265 | ||
1266 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1267 | return old_setting; | |
1268 | ||
1269 | new = prepare_creds(); | |
1270 | if (!new) | |
1271 | return -ENOMEM; | |
3e30148c DH |
1272 | |
1273 | switch (reqkey_defl) { | |
1274 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1275 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1276 | if (ret < 0) |
d84f4f99 | 1277 | goto error; |
3e30148c DH |
1278 | goto set; |
1279 | ||
1280 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1281 | ret = install_process_keyring_to_cred(new); |
1282 | if (ret < 0) { | |
1283 | if (ret != -EEXIST) | |
1284 | goto error; | |
1285 | ret = 0; | |
1286 | } | |
1287 | goto set; | |
3e30148c DH |
1288 | |
1289 | case KEY_REQKEY_DEFL_DEFAULT: | |
1290 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1291 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1292 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1293 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1294 | goto set; | |
3e30148c DH |
1295 | |
1296 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1297 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1298 | default: | |
d84f4f99 DH |
1299 | ret = -EINVAL; |
1300 | goto error; | |
3e30148c DH |
1301 | } |
1302 | ||
d84f4f99 DH |
1303 | set: |
1304 | new->jit_keyring = reqkey_defl; | |
1305 | commit_creds(new); | |
1306 | return old_setting; | |
1307 | error: | |
1308 | abort_creds(new); | |
4303ef19 | 1309 | return ret; |
a8b17ed0 | 1310 | } |
d84f4f99 | 1311 | |
017679c4 | 1312 | /* |
973c9f4f DH |
1313 | * Set or clear the timeout on a key. |
1314 | * | |
1315 | * Either the key must grant the caller Setattr permission or else the caller | |
1316 | * must hold an instantiation authorisation token for the key. | |
1317 | * | |
1318 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1319 | * the current time. The key and any links to the key will be automatically | |
1320 | * garbage collected after the timeout expires. | |
1321 | * | |
1322 | * If successful, 0 is returned. | |
017679c4 DH |
1323 | */ |
1324 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1325 | { | |
9156235b | 1326 | struct key *key, *instkey; |
017679c4 | 1327 | key_ref_t key_ref; |
017679c4 DH |
1328 | long ret; |
1329 | ||
5593122e | 1330 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 1331 | KEY_NEED_SETATTR); |
017679c4 | 1332 | if (IS_ERR(key_ref)) { |
9156235b DH |
1333 | /* setting the timeout on a key under construction is permitted |
1334 | * if we have the authorisation token handy */ | |
1335 | if (PTR_ERR(key_ref) == -EACCES) { | |
1336 | instkey = key_get_instantiation_authkey(id); | |
1337 | if (!IS_ERR(instkey)) { | |
1338 | key_put(instkey); | |
1339 | key_ref = lookup_user_key(id, | |
1340 | KEY_LOOKUP_PARTIAL, | |
1341 | 0); | |
1342 | if (!IS_ERR(key_ref)) | |
1343 | goto okay; | |
1344 | } | |
1345 | } | |
1346 | ||
017679c4 DH |
1347 | ret = PTR_ERR(key_ref); |
1348 | goto error; | |
1349 | } | |
1350 | ||
9156235b | 1351 | okay: |
017679c4 | 1352 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1353 | key_set_timeout(key, timeout); |
017679c4 DH |
1354 | key_put(key); |
1355 | ||
1356 | ret = 0; | |
1357 | error: | |
1358 | return ret; | |
a8b17ed0 | 1359 | } |
017679c4 | 1360 | |
b5f545c8 | 1361 | /* |
973c9f4f DH |
1362 | * Assume (or clear) the authority to instantiate the specified key. |
1363 | * | |
1364 | * This sets the authoritative token currently in force for key instantiation. | |
1365 | * This must be done for a key to be instantiated. It has the effect of making | |
1366 | * available all the keys from the caller of the request_key() that created a | |
1367 | * key to request_key() calls made by the caller of this function. | |
1368 | * | |
1369 | * The caller must have the instantiation key in their process keyrings with a | |
1370 | * Search permission grant available to the caller. | |
1371 | * | |
1372 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1373 | * | |
1374 | * If the ID given has a matching an authorisation key, then that key will be | |
1375 | * set and its ID will be returned. The authorisation key can be read to get | |
1376 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1377 | */ |
1378 | long keyctl_assume_authority(key_serial_t id) | |
1379 | { | |
1380 | struct key *authkey; | |
1381 | long ret; | |
1382 | ||
1383 | /* special key IDs aren't permitted */ | |
1384 | ret = -EINVAL; | |
1385 | if (id < 0) | |
1386 | goto error; | |
1387 | ||
1388 | /* we divest ourselves of authority if given an ID of 0 */ | |
1389 | if (id == 0) { | |
d84f4f99 | 1390 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1391 | goto error; |
1392 | } | |
1393 | ||
1394 | /* attempt to assume the authority temporarily granted to us whilst we | |
1395 | * instantiate the specified key | |
1396 | * - the authorisation key must be in the current task's keyrings | |
1397 | * somewhere | |
1398 | */ | |
1399 | authkey = key_get_instantiation_authkey(id); | |
1400 | if (IS_ERR(authkey)) { | |
1401 | ret = PTR_ERR(authkey); | |
1402 | goto error; | |
1403 | } | |
1404 | ||
d84f4f99 DH |
1405 | ret = keyctl_change_reqkey_auth(authkey); |
1406 | if (ret < 0) | |
1407 | goto error; | |
1408 | key_put(authkey); | |
b5f545c8 | 1409 | |
d84f4f99 | 1410 | ret = authkey->serial; |
b5f545c8 DH |
1411 | error: |
1412 | return ret; | |
a8b17ed0 | 1413 | } |
b5f545c8 | 1414 | |
70a5bb72 | 1415 | /* |
973c9f4f DH |
1416 | * Get a key's the LSM security label. |
1417 | * | |
1418 | * The key must grant the caller View permission for this to work. | |
1419 | * | |
1420 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1421 | * | |
1422 | * If successful, the amount of information available will be returned, | |
1423 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1424 | */ |
1425 | long keyctl_get_security(key_serial_t keyid, | |
1426 | char __user *buffer, | |
1427 | size_t buflen) | |
1428 | { | |
1429 | struct key *key, *instkey; | |
1430 | key_ref_t key_ref; | |
1431 | char *context; | |
1432 | long ret; | |
1433 | ||
f5895943 | 1434 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
70a5bb72 DH |
1435 | if (IS_ERR(key_ref)) { |
1436 | if (PTR_ERR(key_ref) != -EACCES) | |
1437 | return PTR_ERR(key_ref); | |
1438 | ||
1439 | /* viewing a key under construction is also permitted if we | |
1440 | * have the authorisation token handy */ | |
1441 | instkey = key_get_instantiation_authkey(keyid); | |
1442 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1443 | return PTR_ERR(instkey); |
70a5bb72 DH |
1444 | key_put(instkey); |
1445 | ||
5593122e | 1446 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1447 | if (IS_ERR(key_ref)) |
1448 | return PTR_ERR(key_ref); | |
1449 | } | |
1450 | ||
1451 | key = key_ref_to_ptr(key_ref); | |
1452 | ret = security_key_getsecurity(key, &context); | |
1453 | if (ret == 0) { | |
1454 | /* if no information was returned, give userspace an empty | |
1455 | * string */ | |
1456 | ret = 1; | |
1457 | if (buffer && buflen > 0 && | |
1458 | copy_to_user(buffer, "", 1) != 0) | |
1459 | ret = -EFAULT; | |
1460 | } else if (ret > 0) { | |
1461 | /* return as much data as there's room for */ | |
1462 | if (buffer && buflen > 0) { | |
1463 | if (buflen > ret) | |
1464 | buflen = ret; | |
1465 | ||
1466 | if (copy_to_user(buffer, context, buflen) != 0) | |
1467 | ret = -EFAULT; | |
1468 | } | |
1469 | ||
1470 | kfree(context); | |
1471 | } | |
1472 | ||
1473 | key_ref_put(key_ref); | |
1474 | return ret; | |
1475 | } | |
1476 | ||
ee18d64c | 1477 | /* |
973c9f4f DH |
1478 | * Attempt to install the calling process's session keyring on the process's |
1479 | * parent process. | |
1480 | * | |
1481 | * The keyring must exist and must grant the caller LINK permission, and the | |
1482 | * parent process must be single-threaded and must have the same effective | |
1483 | * ownership as this process and mustn't be SUID/SGID. | |
1484 | * | |
1485 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1486 | * | |
1487 | * If successful, 0 will be returned. | |
ee18d64c DH |
1488 | */ |
1489 | long keyctl_session_to_parent(void) | |
1490 | { | |
1491 | struct task_struct *me, *parent; | |
1492 | const struct cred *mycred, *pcred; | |
67d12145 | 1493 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1494 | key_ref_t keyring_r; |
413cd3d9 | 1495 | struct cred *cred; |
ee18d64c DH |
1496 | int ret; |
1497 | ||
f5895943 | 1498 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
ee18d64c DH |
1499 | if (IS_ERR(keyring_r)) |
1500 | return PTR_ERR(keyring_r); | |
1501 | ||
413cd3d9 | 1502 | ret = -ENOMEM; |
413cd3d9 | 1503 | |
ee18d64c DH |
1504 | /* our parent is going to need a new cred struct, a new tgcred struct |
1505 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1506 | * our parent */ | |
ee18d64c DH |
1507 | cred = cred_alloc_blank(); |
1508 | if (!cred) | |
67d12145 AV |
1509 | goto error_keyring; |
1510 | newwork = &cred->rcu; | |
ee18d64c | 1511 | |
3a50597d DH |
1512 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1513 | keyring_r = NULL; | |
67d12145 | 1514 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1515 | |
1516 | me = current; | |
9d1ac65a | 1517 | rcu_read_lock(); |
ee18d64c DH |
1518 | write_lock_irq(&tasklist_lock); |
1519 | ||
ee18d64c | 1520 | ret = -EPERM; |
413cd3d9 ON |
1521 | oldwork = NULL; |
1522 | parent = me->real_parent; | |
ee18d64c DH |
1523 | |
1524 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1525 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1526 | goto unlock; |
ee18d64c DH |
1527 | |
1528 | /* the parent must be single threaded */ | |
dd98acf7 | 1529 | if (!thread_group_empty(parent)) |
413cd3d9 | 1530 | goto unlock; |
ee18d64c DH |
1531 | |
1532 | /* the parent and the child must have different session keyrings or | |
1533 | * there's no point */ | |
1534 | mycred = current_cred(); | |
1535 | pcred = __task_cred(parent); | |
1536 | if (mycred == pcred || | |
3a50597d | 1537 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1538 | ret = 0; |
1539 | goto unlock; | |
1540 | } | |
ee18d64c DH |
1541 | |
1542 | /* the parent must have the same effective ownership and mustn't be | |
1543 | * SUID/SGID */ | |
9a56c2db EB |
1544 | if (!uid_eq(pcred->uid, mycred->euid) || |
1545 | !uid_eq(pcred->euid, mycred->euid) || | |
1546 | !uid_eq(pcred->suid, mycred->euid) || | |
1547 | !gid_eq(pcred->gid, mycred->egid) || | |
1548 | !gid_eq(pcred->egid, mycred->egid) || | |
1549 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1550 | goto unlock; |
ee18d64c DH |
1551 | |
1552 | /* the keyrings must have the same UID */ | |
3a50597d | 1553 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1554 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1555 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1556 | goto unlock; |
ee18d64c | 1557 | |
413cd3d9 ON |
1558 | /* cancel an already pending keyring replacement */ |
1559 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1560 | |
1561 | /* the replacement session keyring is applied just prior to userspace | |
1562 | * restarting */ | |
67d12145 | 1563 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1564 | if (!ret) |
1565 | newwork = NULL; | |
1566 | unlock: | |
ee18d64c | 1567 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1568 | rcu_read_unlock(); |
67d12145 AV |
1569 | if (oldwork) |
1570 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1571 | if (newwork) | |
1572 | put_cred(cred); | |
ee18d64c DH |
1573 | return ret; |
1574 | ||
1575 | error_keyring: | |
1576 | key_ref_put(keyring_r); | |
1577 | return ret; | |
1578 | } | |
1579 | ||
1da177e4 | 1580 | /* |
973c9f4f | 1581 | * The key control system call |
1da177e4 | 1582 | */ |
938bb9f5 HC |
1583 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1584 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1585 | { |
1586 | switch (option) { | |
1587 | case KEYCTL_GET_KEYRING_ID: | |
1588 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1589 | (int) arg3); | |
1590 | ||
1591 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1592 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1593 | ||
1594 | case KEYCTL_UPDATE: | |
1595 | return keyctl_update_key((key_serial_t) arg2, | |
1596 | (const void __user *) arg3, | |
1597 | (size_t) arg4); | |
1598 | ||
1599 | case KEYCTL_REVOKE: | |
1600 | return keyctl_revoke_key((key_serial_t) arg2); | |
1601 | ||
1602 | case KEYCTL_DESCRIBE: | |
1603 | return keyctl_describe_key((key_serial_t) arg2, | |
1604 | (char __user *) arg3, | |
1605 | (unsigned) arg4); | |
1606 | ||
1607 | case KEYCTL_CLEAR: | |
1608 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1609 | ||
1610 | case KEYCTL_LINK: | |
1611 | return keyctl_keyring_link((key_serial_t) arg2, | |
1612 | (key_serial_t) arg3); | |
1613 | ||
1614 | case KEYCTL_UNLINK: | |
1615 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1616 | (key_serial_t) arg3); | |
1617 | ||
1618 | case KEYCTL_SEARCH: | |
1619 | return keyctl_keyring_search((key_serial_t) arg2, | |
1620 | (const char __user *) arg3, | |
1621 | (const char __user *) arg4, | |
1622 | (key_serial_t) arg5); | |
1623 | ||
1624 | case KEYCTL_READ: | |
1625 | return keyctl_read_key((key_serial_t) arg2, | |
1626 | (char __user *) arg3, | |
1627 | (size_t) arg4); | |
1628 | ||
1629 | case KEYCTL_CHOWN: | |
1630 | return keyctl_chown_key((key_serial_t) arg2, | |
1631 | (uid_t) arg3, | |
1632 | (gid_t) arg4); | |
1633 | ||
1634 | case KEYCTL_SETPERM: | |
1635 | return keyctl_setperm_key((key_serial_t) arg2, | |
1636 | (key_perm_t) arg3); | |
1637 | ||
1638 | case KEYCTL_INSTANTIATE: | |
1639 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1640 | (const void __user *) arg3, | |
1641 | (size_t) arg4, | |
1642 | (key_serial_t) arg5); | |
1643 | ||
1644 | case KEYCTL_NEGATE: | |
1645 | return keyctl_negate_key((key_serial_t) arg2, | |
1646 | (unsigned) arg3, | |
1647 | (key_serial_t) arg4); | |
1648 | ||
3e30148c DH |
1649 | case KEYCTL_SET_REQKEY_KEYRING: |
1650 | return keyctl_set_reqkey_keyring(arg2); | |
1651 | ||
017679c4 DH |
1652 | case KEYCTL_SET_TIMEOUT: |
1653 | return keyctl_set_timeout((key_serial_t) arg2, | |
1654 | (unsigned) arg3); | |
1655 | ||
b5f545c8 DH |
1656 | case KEYCTL_ASSUME_AUTHORITY: |
1657 | return keyctl_assume_authority((key_serial_t) arg2); | |
1658 | ||
70a5bb72 DH |
1659 | case KEYCTL_GET_SECURITY: |
1660 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1661 | (char __user *) arg3, |
70a5bb72 DH |
1662 | (size_t) arg4); |
1663 | ||
ee18d64c DH |
1664 | case KEYCTL_SESSION_TO_PARENT: |
1665 | return keyctl_session_to_parent(); | |
1666 | ||
fdd1b945 DH |
1667 | case KEYCTL_REJECT: |
1668 | return keyctl_reject_key((key_serial_t) arg2, | |
1669 | (unsigned) arg3, | |
1670 | (unsigned) arg4, | |
1671 | (key_serial_t) arg5); | |
1672 | ||
ee009e4a DH |
1673 | case KEYCTL_INSTANTIATE_IOV: |
1674 | return keyctl_instantiate_key_iov( | |
1675 | (key_serial_t) arg2, | |
1676 | (const struct iovec __user *) arg3, | |
1677 | (unsigned) arg4, | |
1678 | (key_serial_t) arg5); | |
1679 | ||
fd75815f DH |
1680 | case KEYCTL_INVALIDATE: |
1681 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1682 | ||
f36f8c75 DH |
1683 | case KEYCTL_GET_PERSISTENT: |
1684 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1685 | ||
1da177e4 LT |
1686 | default: |
1687 | return -EOPNOTSUPP; | |
1688 | } | |
a8b17ed0 | 1689 | } |