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> | |
17 | #include <linux/keyctl.h> | |
18 | #include <linux/fs.h> | |
c59ede7b | 19 | #include <linux/capability.h> |
0cb409d9 | 20 | #include <linux/string.h> |
1da177e4 | 21 | #include <linux/err.h> |
38bbca6b | 22 | #include <linux/vmalloc.h> |
70a5bb72 | 23 | #include <linux/security.h> |
1da177e4 LT |
24 | #include <asm/uaccess.h> |
25 | #include "internal.h" | |
26 | ||
0cb409d9 DA |
27 | static int key_get_type_from_user(char *type, |
28 | const char __user *_type, | |
29 | unsigned len) | |
30 | { | |
31 | int ret; | |
32 | ||
33 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 34 | if (ret < 0) |
4303ef19 | 35 | return ret; |
0cb409d9 DA |
36 | if (ret == 0 || ret >= len) |
37 | return -EINVAL; | |
0cb409d9 DA |
38 | if (type[0] == '.') |
39 | return -EPERM; | |
0cb409d9 | 40 | type[len - 1] = '\0'; |
0cb409d9 DA |
41 | return 0; |
42 | } | |
43 | ||
1da177e4 | 44 | /* |
973c9f4f DH |
45 | * Extract the description of a new key from userspace and either add it as a |
46 | * new key to the specified keyring or update a matching key in that keyring. | |
47 | * | |
48 | * The keyring must be writable so that we can attach the key to it. | |
49 | * | |
50 | * If successful, the new key's serial number is returned, otherwise an error | |
51 | * code is returned. | |
1da177e4 | 52 | */ |
1e7bfb21 HC |
53 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
54 | const char __user *, _description, | |
55 | const void __user *, _payload, | |
56 | size_t, plen, | |
57 | key_serial_t, ringid) | |
1da177e4 | 58 | { |
664cceb0 | 59 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
60 | char type[32], *description; |
61 | void *payload; | |
0cb409d9 | 62 | long ret; |
38bbca6b | 63 | bool vm; |
1da177e4 LT |
64 | |
65 | ret = -EINVAL; | |
38bbca6b | 66 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
67 | goto error; |
68 | ||
69 | /* draw all the data into kernel space */ | |
0cb409d9 | 70 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
71 | if (ret < 0) |
72 | goto error; | |
1da177e4 | 73 | |
0cb409d9 DA |
74 | description = strndup_user(_description, PAGE_SIZE); |
75 | if (IS_ERR(description)) { | |
76 | ret = PTR_ERR(description); | |
1da177e4 | 77 | goto error; |
0cb409d9 | 78 | } |
1da177e4 LT |
79 | |
80 | /* pull the payload in if one was supplied */ | |
81 | payload = NULL; | |
82 | ||
38bbca6b | 83 | vm = false; |
1da177e4 LT |
84 | if (_payload) { |
85 | ret = -ENOMEM; | |
86 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
87 | if (!payload) { |
88 | if (plen <= PAGE_SIZE) | |
89 | goto error2; | |
90 | vm = true; | |
91 | payload = vmalloc(plen); | |
92 | if (!payload) | |
93 | goto error2; | |
94 | } | |
1da177e4 LT |
95 | |
96 | ret = -EFAULT; | |
97 | if (copy_from_user(payload, _payload, plen) != 0) | |
98 | goto error3; | |
99 | } | |
100 | ||
101 | /* find the target keyring (which must be writable) */ | |
5593122e | 102 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
103 | if (IS_ERR(keyring_ref)) { |
104 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
105 | goto error3; |
106 | } | |
107 | ||
108 | /* create or update the requested key and add it to the target | |
109 | * keyring */ | |
664cceb0 | 110 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
111 | payload, plen, KEY_PERM_UNDEF, |
112 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
113 | if (!IS_ERR(key_ref)) { |
114 | ret = key_ref_to_ptr(key_ref)->serial; | |
115 | key_ref_put(key_ref); | |
1da177e4 LT |
116 | } |
117 | else { | |
664cceb0 | 118 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
119 | } |
120 | ||
664cceb0 | 121 | key_ref_put(keyring_ref); |
1da177e4 | 122 | error3: |
38bbca6b DH |
123 | if (!vm) |
124 | kfree(payload); | |
125 | else | |
126 | vfree(payload); | |
1da177e4 LT |
127 | error2: |
128 | kfree(description); | |
129 | error: | |
130 | return ret; | |
a8b17ed0 | 131 | } |
1da177e4 | 132 | |
1da177e4 | 133 | /* |
973c9f4f DH |
134 | * Search the process keyrings and keyring trees linked from those for a |
135 | * matching key. Keyrings must have appropriate Search permission to be | |
136 | * searched. | |
137 | * | |
138 | * If a key is found, it will be attached to the destination keyring if there's | |
139 | * one specified and the serial number of the key will be returned. | |
140 | * | |
141 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
142 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
143 | * passed to /sbin/request-key to aid with completing the request. If the | |
144 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 145 | */ |
1e7bfb21 HC |
146 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
147 | const char __user *, _description, | |
148 | const char __user *, _callout_info, | |
149 | key_serial_t, destringid) | |
1da177e4 LT |
150 | { |
151 | struct key_type *ktype; | |
664cceb0 DH |
152 | struct key *key; |
153 | key_ref_t dest_ref; | |
4a38e122 | 154 | size_t callout_len; |
1da177e4 | 155 | char type[32], *description, *callout_info; |
0cb409d9 | 156 | long ret; |
1da177e4 LT |
157 | |
158 | /* pull the type into kernel space */ | |
0cb409d9 | 159 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
160 | if (ret < 0) |
161 | goto error; | |
1260f801 | 162 | |
1da177e4 | 163 | /* pull the description into kernel space */ |
0cb409d9 DA |
164 | description = strndup_user(_description, PAGE_SIZE); |
165 | if (IS_ERR(description)) { | |
166 | ret = PTR_ERR(description); | |
1da177e4 | 167 | goto error; |
0cb409d9 | 168 | } |
1da177e4 LT |
169 | |
170 | /* pull the callout info into kernel space */ | |
171 | callout_info = NULL; | |
4a38e122 | 172 | callout_len = 0; |
1da177e4 | 173 | if (_callout_info) { |
0cb409d9 DA |
174 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
175 | if (IS_ERR(callout_info)) { | |
176 | ret = PTR_ERR(callout_info); | |
1da177e4 | 177 | goto error2; |
0cb409d9 | 178 | } |
4a38e122 | 179 | callout_len = strlen(callout_info); |
1da177e4 LT |
180 | } |
181 | ||
182 | /* get the destination keyring if specified */ | |
664cceb0 | 183 | dest_ref = NULL; |
1da177e4 | 184 | if (destringid) { |
5593122e DH |
185 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
186 | KEY_WRITE); | |
664cceb0 DH |
187 | if (IS_ERR(dest_ref)) { |
188 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
189 | goto error3; |
190 | } | |
191 | } | |
192 | ||
193 | /* find the key type */ | |
194 | ktype = key_type_lookup(type); | |
195 | if (IS_ERR(ktype)) { | |
196 | ret = PTR_ERR(ktype); | |
197 | goto error4; | |
198 | } | |
199 | ||
200 | /* do the search */ | |
4a38e122 DH |
201 | key = request_key_and_link(ktype, description, callout_info, |
202 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 203 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
204 | if (IS_ERR(key)) { |
205 | ret = PTR_ERR(key); | |
206 | goto error5; | |
207 | } | |
208 | ||
1da177e4 LT |
209 | ret = key->serial; |
210 | ||
3e30148c | 211 | key_put(key); |
c5b60b5e | 212 | error5: |
1da177e4 | 213 | key_type_put(ktype); |
c5b60b5e | 214 | error4: |
664cceb0 | 215 | key_ref_put(dest_ref); |
c5b60b5e | 216 | error3: |
1da177e4 | 217 | kfree(callout_info); |
c5b60b5e | 218 | error2: |
1da177e4 | 219 | kfree(description); |
c5b60b5e | 220 | error: |
1da177e4 | 221 | return ret; |
a8b17ed0 | 222 | } |
1da177e4 | 223 | |
1da177e4 | 224 | /* |
973c9f4f DH |
225 | * Get the ID of the specified process keyring. |
226 | * | |
227 | * The requested keyring must have search permission to be found. | |
228 | * | |
229 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
230 | */ |
231 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
232 | { | |
664cceb0 | 233 | key_ref_t key_ref; |
5593122e | 234 | unsigned long lflags; |
1da177e4 LT |
235 | long ret; |
236 | ||
5593122e DH |
237 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
238 | key_ref = lookup_user_key(id, lflags, KEY_SEARCH); | |
664cceb0 DH |
239 | if (IS_ERR(key_ref)) { |
240 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
241 | goto error; |
242 | } | |
243 | ||
664cceb0 DH |
244 | ret = key_ref_to_ptr(key_ref)->serial; |
245 | key_ref_put(key_ref); | |
c5b60b5e | 246 | error: |
1da177e4 | 247 | return ret; |
973c9f4f | 248 | } |
1da177e4 | 249 | |
1da177e4 | 250 | /* |
973c9f4f DH |
251 | * Join a (named) session keyring. |
252 | * | |
253 | * Create and join an anonymous session keyring or join a named session | |
254 | * keyring, creating it if necessary. A named session keyring must have Search | |
255 | * permission for it to be joined. Session keyrings without this permit will | |
256 | * be skipped over. | |
257 | * | |
258 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
259 | */ |
260 | long keyctl_join_session_keyring(const char __user *_name) | |
261 | { | |
262 | char *name; | |
0cb409d9 | 263 | long ret; |
1da177e4 LT |
264 | |
265 | /* fetch the name from userspace */ | |
266 | name = NULL; | |
267 | if (_name) { | |
0cb409d9 DA |
268 | name = strndup_user(_name, PAGE_SIZE); |
269 | if (IS_ERR(name)) { | |
270 | ret = PTR_ERR(name); | |
1da177e4 | 271 | goto error; |
0cb409d9 | 272 | } |
1da177e4 LT |
273 | } |
274 | ||
275 | /* join the session */ | |
276 | ret = join_session_keyring(name); | |
0d54ee1c | 277 | kfree(name); |
1da177e4 | 278 | |
c5b60b5e | 279 | error: |
1da177e4 | 280 | return ret; |
a8b17ed0 | 281 | } |
1da177e4 | 282 | |
1da177e4 | 283 | /* |
973c9f4f DH |
284 | * Update a key's data payload from the given data. |
285 | * | |
286 | * The key must grant the caller Write permission and the key type must support | |
287 | * updating for this to work. A negative key can be positively instantiated | |
288 | * with this call. | |
289 | * | |
290 | * If successful, 0 will be returned. If the key type does not support | |
291 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
292 | */ |
293 | long keyctl_update_key(key_serial_t id, | |
294 | const void __user *_payload, | |
295 | size_t plen) | |
296 | { | |
664cceb0 | 297 | key_ref_t key_ref; |
1da177e4 LT |
298 | void *payload; |
299 | long ret; | |
300 | ||
301 | ret = -EINVAL; | |
302 | if (plen > PAGE_SIZE) | |
303 | goto error; | |
304 | ||
305 | /* pull the payload in if one was supplied */ | |
306 | payload = NULL; | |
307 | if (_payload) { | |
308 | ret = -ENOMEM; | |
309 | payload = kmalloc(plen, GFP_KERNEL); | |
310 | if (!payload) | |
311 | goto error; | |
312 | ||
313 | ret = -EFAULT; | |
314 | if (copy_from_user(payload, _payload, plen) != 0) | |
315 | goto error2; | |
316 | } | |
317 | ||
318 | /* find the target key (which must be writable) */ | |
5593122e | 319 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
320 | if (IS_ERR(key_ref)) { |
321 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
322 | goto error2; |
323 | } | |
324 | ||
325 | /* update the key */ | |
664cceb0 | 326 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 327 | |
664cceb0 | 328 | key_ref_put(key_ref); |
c5b60b5e | 329 | error2: |
1da177e4 | 330 | kfree(payload); |
c5b60b5e | 331 | error: |
1da177e4 | 332 | return ret; |
a8b17ed0 | 333 | } |
1da177e4 | 334 | |
1da177e4 | 335 | /* |
973c9f4f DH |
336 | * Revoke a key. |
337 | * | |
338 | * The key must be grant the caller Write or Setattr permission for this to | |
339 | * work. The key type should give up its quota claim when revoked. The key | |
340 | * and any links to the key will be automatically garbage collected after a | |
341 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
342 | * | |
343 | * If successful, 0 is returned. | |
1da177e4 LT |
344 | */ |
345 | long keyctl_revoke_key(key_serial_t id) | |
346 | { | |
664cceb0 | 347 | key_ref_t key_ref; |
1da177e4 LT |
348 | long ret; |
349 | ||
5593122e | 350 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
351 | if (IS_ERR(key_ref)) { |
352 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
353 | if (ret != -EACCES) |
354 | goto error; | |
355 | key_ref = lookup_user_key(id, 0, KEY_SETATTR); | |
356 | if (IS_ERR(key_ref)) { | |
357 | ret = PTR_ERR(key_ref); | |
358 | goto error; | |
359 | } | |
1da177e4 LT |
360 | } |
361 | ||
664cceb0 | 362 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
363 | ret = 0; |
364 | ||
664cceb0 | 365 | key_ref_put(key_ref); |
c5b60b5e | 366 | error: |
1260f801 | 367 | return ret; |
a8b17ed0 | 368 | } |
1da177e4 | 369 | |
1da177e4 | 370 | /* |
973c9f4f DH |
371 | * Clear the specified keyring, creating an empty process keyring if one of the |
372 | * special keyring IDs is used. | |
373 | * | |
374 | * The keyring must grant the caller Write permission for this to work. If | |
375 | * successful, 0 will be returned. | |
1da177e4 LT |
376 | */ |
377 | long keyctl_keyring_clear(key_serial_t ringid) | |
378 | { | |
664cceb0 | 379 | key_ref_t keyring_ref; |
1da177e4 LT |
380 | long ret; |
381 | ||
5593122e | 382 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
383 | if (IS_ERR(keyring_ref)) { |
384 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
385 | goto error; |
386 | } | |
387 | ||
664cceb0 | 388 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
1da177e4 | 389 | |
664cceb0 | 390 | key_ref_put(keyring_ref); |
c5b60b5e | 391 | error: |
1da177e4 | 392 | return ret; |
a8b17ed0 | 393 | } |
1da177e4 | 394 | |
1da177e4 | 395 | /* |
973c9f4f DH |
396 | * Create a link from a keyring to a key if there's no matching key in the |
397 | * keyring, otherwise replace the link to the matching key with a link to the | |
398 | * new key. | |
399 | * | |
400 | * The key must grant the caller Link permission and the the keyring must grant | |
401 | * the caller Write permission. Furthermore, if an additional link is created, | |
402 | * the keyring's quota will be extended. | |
403 | * | |
404 | * If successful, 0 will be returned. | |
1da177e4 LT |
405 | */ |
406 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
407 | { | |
664cceb0 | 408 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
409 | long ret; |
410 | ||
5593122e | 411 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
412 | if (IS_ERR(keyring_ref)) { |
413 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
414 | goto error; |
415 | } | |
416 | ||
5593122e | 417 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK); |
664cceb0 DH |
418 | if (IS_ERR(key_ref)) { |
419 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
420 | goto error2; |
421 | } | |
422 | ||
664cceb0 | 423 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 424 | |
664cceb0 | 425 | key_ref_put(key_ref); |
c5b60b5e | 426 | error2: |
664cceb0 | 427 | key_ref_put(keyring_ref); |
c5b60b5e | 428 | error: |
1da177e4 | 429 | return ret; |
a8b17ed0 | 430 | } |
1da177e4 | 431 | |
1da177e4 | 432 | /* |
973c9f4f DH |
433 | * Unlink a key from a keyring. |
434 | * | |
435 | * The keyring must grant the caller Write permission for this to work; the key | |
436 | * itself need not grant the caller anything. If the last link to a key is | |
437 | * removed then that key will be scheduled for destruction. | |
438 | * | |
439 | * If successful, 0 will be returned. | |
1da177e4 LT |
440 | */ |
441 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
442 | { | |
664cceb0 | 443 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
444 | long ret; |
445 | ||
5593122e | 446 | keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE); |
664cceb0 DH |
447 | if (IS_ERR(keyring_ref)) { |
448 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
449 | goto error; |
450 | } | |
451 | ||
5593122e | 452 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
453 | if (IS_ERR(key_ref)) { |
454 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
455 | goto error2; |
456 | } | |
457 | ||
664cceb0 | 458 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 459 | |
664cceb0 | 460 | key_ref_put(key_ref); |
c5b60b5e | 461 | error2: |
664cceb0 | 462 | key_ref_put(keyring_ref); |
c5b60b5e | 463 | error: |
1da177e4 | 464 | return ret; |
a8b17ed0 | 465 | } |
1da177e4 | 466 | |
1da177e4 | 467 | /* |
973c9f4f DH |
468 | * Return a description of a key to userspace. |
469 | * | |
470 | * The key must grant the caller View permission for this to work. | |
471 | * | |
472 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
473 | * in the following way: | |
474 | * | |
1da177e4 | 475 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
476 | * |
477 | * If successful, we return the amount of description available, irrespective | |
478 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
479 | */ |
480 | long keyctl_describe_key(key_serial_t keyid, | |
481 | char __user *buffer, | |
482 | size_t buflen) | |
483 | { | |
3e30148c | 484 | struct key *key, *instkey; |
664cceb0 | 485 | key_ref_t key_ref; |
1da177e4 LT |
486 | char *tmpbuf; |
487 | long ret; | |
488 | ||
5593122e | 489 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
664cceb0 | 490 | if (IS_ERR(key_ref)) { |
3e30148c DH |
491 | /* viewing a key under construction is permitted if we have the |
492 | * authorisation token handy */ | |
664cceb0 | 493 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
494 | instkey = key_get_instantiation_authkey(keyid); |
495 | if (!IS_ERR(instkey)) { | |
496 | key_put(instkey); | |
8bbf4976 | 497 | key_ref = lookup_user_key(keyid, |
5593122e DH |
498 | KEY_LOOKUP_PARTIAL, |
499 | 0); | |
664cceb0 | 500 | if (!IS_ERR(key_ref)) |
3e30148c DH |
501 | goto okay; |
502 | } | |
503 | } | |
504 | ||
664cceb0 | 505 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
506 | goto error; |
507 | } | |
508 | ||
3e30148c | 509 | okay: |
1da177e4 LT |
510 | /* calculate how much description we're going to return */ |
511 | ret = -ENOMEM; | |
512 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
513 | if (!tmpbuf) | |
514 | goto error2; | |
515 | ||
664cceb0 DH |
516 | key = key_ref_to_ptr(key_ref); |
517 | ||
1da177e4 | 518 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
664cceb0 | 519 | "%s;%d;%d;%08x;%s", |
94fd8405 DH |
520 | key->type->name, |
521 | key->uid, | |
522 | key->gid, | |
523 | key->perm, | |
524 | key->description ?: ""); | |
1da177e4 LT |
525 | |
526 | /* include a NUL char at the end of the data */ | |
527 | if (ret > PAGE_SIZE - 1) | |
528 | ret = PAGE_SIZE - 1; | |
529 | tmpbuf[ret] = 0; | |
530 | ret++; | |
531 | ||
532 | /* consider returning the data */ | |
533 | if (buffer && buflen > 0) { | |
534 | if (buflen > ret) | |
535 | buflen = ret; | |
536 | ||
537 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) | |
538 | ret = -EFAULT; | |
539 | } | |
540 | ||
541 | kfree(tmpbuf); | |
c5b60b5e | 542 | error2: |
664cceb0 | 543 | key_ref_put(key_ref); |
c5b60b5e | 544 | error: |
1da177e4 | 545 | return ret; |
a8b17ed0 | 546 | } |
1da177e4 | 547 | |
1da177e4 | 548 | /* |
973c9f4f DH |
549 | * Search the specified keyring and any keyrings it links to for a matching |
550 | * key. Only keyrings that grant the caller Search permission will be searched | |
551 | * (this includes the starting keyring). Only keys with Search permission can | |
552 | * be found. | |
553 | * | |
554 | * If successful, the found key will be linked to the destination keyring if | |
555 | * supplied and the key has Link permission, and the found key ID will be | |
556 | * returned. | |
1da177e4 LT |
557 | */ |
558 | long keyctl_keyring_search(key_serial_t ringid, | |
559 | const char __user *_type, | |
560 | const char __user *_description, | |
561 | key_serial_t destringid) | |
562 | { | |
563 | struct key_type *ktype; | |
664cceb0 | 564 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 565 | char type[32], *description; |
0cb409d9 | 566 | long ret; |
1da177e4 LT |
567 | |
568 | /* pull the type and description into kernel space */ | |
0cb409d9 | 569 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
570 | if (ret < 0) |
571 | goto error; | |
1da177e4 | 572 | |
0cb409d9 DA |
573 | description = strndup_user(_description, PAGE_SIZE); |
574 | if (IS_ERR(description)) { | |
575 | ret = PTR_ERR(description); | |
1da177e4 | 576 | goto error; |
0cb409d9 | 577 | } |
1da177e4 LT |
578 | |
579 | /* get the keyring at which to begin the search */ | |
5593122e | 580 | keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH); |
664cceb0 DH |
581 | if (IS_ERR(keyring_ref)) { |
582 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
583 | goto error2; |
584 | } | |
585 | ||
586 | /* get the destination keyring if specified */ | |
664cceb0 | 587 | dest_ref = NULL; |
1da177e4 | 588 | if (destringid) { |
5593122e DH |
589 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
590 | KEY_WRITE); | |
664cceb0 DH |
591 | if (IS_ERR(dest_ref)) { |
592 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
593 | goto error3; |
594 | } | |
595 | } | |
596 | ||
597 | /* find the key type */ | |
598 | ktype = key_type_lookup(type); | |
599 | if (IS_ERR(ktype)) { | |
600 | ret = PTR_ERR(ktype); | |
601 | goto error4; | |
602 | } | |
603 | ||
604 | /* do the search */ | |
664cceb0 DH |
605 | key_ref = keyring_search(keyring_ref, ktype, description); |
606 | if (IS_ERR(key_ref)) { | |
607 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
608 | |
609 | /* treat lack or presence of a negative key the same */ | |
610 | if (ret == -EAGAIN) | |
611 | ret = -ENOKEY; | |
612 | goto error5; | |
613 | } | |
614 | ||
615 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 616 | if (dest_ref) { |
29db9190 DH |
617 | ret = key_permission(key_ref, KEY_LINK); |
618 | if (ret < 0) | |
1da177e4 LT |
619 | goto error6; |
620 | ||
664cceb0 | 621 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
622 | if (ret < 0) |
623 | goto error6; | |
624 | } | |
625 | ||
664cceb0 | 626 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 627 | |
c5b60b5e | 628 | error6: |
664cceb0 | 629 | key_ref_put(key_ref); |
c5b60b5e | 630 | error5: |
1da177e4 | 631 | key_type_put(ktype); |
c5b60b5e | 632 | error4: |
664cceb0 | 633 | key_ref_put(dest_ref); |
c5b60b5e | 634 | error3: |
664cceb0 | 635 | key_ref_put(keyring_ref); |
c5b60b5e | 636 | error2: |
1da177e4 | 637 | kfree(description); |
c5b60b5e | 638 | error: |
1da177e4 | 639 | return ret; |
a8b17ed0 | 640 | } |
1da177e4 | 641 | |
1da177e4 | 642 | /* |
973c9f4f DH |
643 | * Read a key's payload. |
644 | * | |
645 | * The key must either grant the caller Read permission, or it must grant the | |
646 | * caller Search permission when searched for from the process keyrings. | |
647 | * | |
648 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
649 | * is provided, and return the amount of data that is available in the key, | |
650 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
651 | */ |
652 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
653 | { | |
664cceb0 DH |
654 | struct key *key; |
655 | key_ref_t key_ref; | |
1da177e4 LT |
656 | long ret; |
657 | ||
658 | /* find the key first */ | |
5593122e | 659 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
660 | if (IS_ERR(key_ref)) { |
661 | ret = -ENOKEY; | |
662 | goto error; | |
1da177e4 LT |
663 | } |
664 | ||
664cceb0 DH |
665 | key = key_ref_to_ptr(key_ref); |
666 | ||
667 | /* see if we can read it directly */ | |
29db9190 DH |
668 | ret = key_permission(key_ref, KEY_READ); |
669 | if (ret == 0) | |
664cceb0 | 670 | goto can_read_key; |
29db9190 DH |
671 | if (ret != -EACCES) |
672 | goto error; | |
664cceb0 DH |
673 | |
674 | /* we can't; see if it's searchable from this process's keyrings | |
675 | * - we automatically take account of the fact that it may be | |
676 | * dangling off an instantiation key | |
677 | */ | |
678 | if (!is_key_possessed(key_ref)) { | |
679 | ret = -EACCES; | |
680 | goto error2; | |
681 | } | |
1da177e4 LT |
682 | |
683 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 684 | can_read_key: |
1da177e4 LT |
685 | ret = key_validate(key); |
686 | if (ret == 0) { | |
687 | ret = -EOPNOTSUPP; | |
688 | if (key->type->read) { | |
689 | /* read the data with the semaphore held (since we | |
690 | * might sleep) */ | |
691 | down_read(&key->sem); | |
692 | ret = key->type->read(key, buffer, buflen); | |
693 | up_read(&key->sem); | |
694 | } | |
695 | } | |
696 | ||
c5b60b5e | 697 | error2: |
1da177e4 | 698 | key_put(key); |
c5b60b5e | 699 | error: |
1da177e4 | 700 | return ret; |
a8b17ed0 | 701 | } |
1da177e4 | 702 | |
1da177e4 | 703 | /* |
973c9f4f DH |
704 | * Change the ownership of a key |
705 | * | |
706 | * The key must grant the caller Setattr permission for this to work, though | |
707 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
708 | * for the GID to be changed to a group the caller is not a member of, the | |
709 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
710 | * attribute is not changed. | |
711 | * | |
712 | * If the UID is to be changed, the new user must have sufficient quota to | |
713 | * accept the key. The quota deduction will be removed from the old user to | |
714 | * the new user should the attribute be changed. | |
715 | * | |
716 | * If successful, 0 will be returned. | |
1da177e4 LT |
717 | */ |
718 | long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid) | |
719 | { | |
5801649d | 720 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 721 | struct key *key; |
664cceb0 | 722 | key_ref_t key_ref; |
1da177e4 LT |
723 | long ret; |
724 | ||
725 | ret = 0; | |
726 | if (uid == (uid_t) -1 && gid == (gid_t) -1) | |
727 | goto error; | |
728 | ||
5593122e DH |
729 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
730 | KEY_SETATTR); | |
664cceb0 DH |
731 | if (IS_ERR(key_ref)) { |
732 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
733 | goto error; |
734 | } | |
735 | ||
664cceb0 DH |
736 | key = key_ref_to_ptr(key_ref); |
737 | ||
1da177e4 LT |
738 | /* make the changes with the locks held to prevent chown/chown races */ |
739 | ret = -EACCES; | |
740 | down_write(&key->sem); | |
1da177e4 LT |
741 | |
742 | if (!capable(CAP_SYS_ADMIN)) { | |
743 | /* only the sysadmin can chown a key to some other UID */ | |
744 | if (uid != (uid_t) -1 && key->uid != uid) | |
5801649d | 745 | goto error_put; |
1da177e4 LT |
746 | |
747 | /* only the sysadmin can set the key's GID to a group other | |
748 | * than one of those that the current process subscribes to */ | |
749 | if (gid != (gid_t) -1 && gid != key->gid && !in_group_p(gid)) | |
5801649d | 750 | goto error_put; |
1da177e4 LT |
751 | } |
752 | ||
5801649d | 753 | /* change the UID */ |
1da177e4 | 754 | if (uid != (uid_t) -1 && uid != key->uid) { |
5801649d | 755 | ret = -ENOMEM; |
1d1e9756 | 756 | newowner = key_user_lookup(uid, current_user_ns()); |
5801649d FT |
757 | if (!newowner) |
758 | goto error_put; | |
759 | ||
760 | /* transfer the quota burden to the new user */ | |
761 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
0b77f5bf DH |
762 | unsigned maxkeys = (uid == 0) ? |
763 | key_quota_root_maxkeys : key_quota_maxkeys; | |
764 | unsigned maxbytes = (uid == 0) ? | |
765 | key_quota_root_maxbytes : key_quota_maxbytes; | |
766 | ||
5801649d | 767 | spin_lock(&newowner->lock); |
0b77f5bf DH |
768 | if (newowner->qnkeys + 1 >= maxkeys || |
769 | newowner->qnbytes + key->quotalen >= maxbytes || | |
770 | newowner->qnbytes + key->quotalen < | |
771 | newowner->qnbytes) | |
5801649d FT |
772 | goto quota_overrun; |
773 | ||
774 | newowner->qnkeys++; | |
775 | newowner->qnbytes += key->quotalen; | |
776 | spin_unlock(&newowner->lock); | |
777 | ||
778 | spin_lock(&key->user->lock); | |
779 | key->user->qnkeys--; | |
780 | key->user->qnbytes -= key->quotalen; | |
781 | spin_unlock(&key->user->lock); | |
782 | } | |
783 | ||
784 | atomic_dec(&key->user->nkeys); | |
785 | atomic_inc(&newowner->nkeys); | |
786 | ||
787 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
788 | atomic_dec(&key->user->nikeys); | |
789 | atomic_inc(&newowner->nikeys); | |
790 | } | |
791 | ||
792 | zapowner = key->user; | |
793 | key->user = newowner; | |
794 | key->uid = uid; | |
1da177e4 LT |
795 | } |
796 | ||
797 | /* change the GID */ | |
798 | if (gid != (gid_t) -1) | |
799 | key->gid = gid; | |
800 | ||
801 | ret = 0; | |
802 | ||
5801649d | 803 | error_put: |
1da177e4 LT |
804 | up_write(&key->sem); |
805 | key_put(key); | |
5801649d FT |
806 | if (zapowner) |
807 | key_user_put(zapowner); | |
808 | error: | |
1da177e4 LT |
809 | return ret; |
810 | ||
5801649d FT |
811 | quota_overrun: |
812 | spin_unlock(&newowner->lock); | |
813 | zapowner = newowner; | |
814 | ret = -EDQUOT; | |
815 | goto error_put; | |
a8b17ed0 | 816 | } |
5801649d | 817 | |
1da177e4 | 818 | /* |
973c9f4f DH |
819 | * Change the permission mask on a key. |
820 | * | |
821 | * The key must grant the caller Setattr permission for this to work, though | |
822 | * the key need not be fully instantiated yet. If the caller does not have | |
823 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
824 | */ |
825 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
826 | { | |
827 | struct key *key; | |
664cceb0 | 828 | key_ref_t key_ref; |
1da177e4 LT |
829 | long ret; |
830 | ||
831 | ret = -EINVAL; | |
664cceb0 | 832 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
833 | goto error; |
834 | ||
5593122e DH |
835 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
836 | KEY_SETATTR); | |
664cceb0 DH |
837 | if (IS_ERR(key_ref)) { |
838 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
839 | goto error; |
840 | } | |
841 | ||
664cceb0 DH |
842 | key = key_ref_to_ptr(key_ref); |
843 | ||
76d8aeab | 844 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
845 | ret = -EACCES; |
846 | down_write(&key->sem); | |
1da177e4 | 847 | |
76d8aeab | 848 | /* if we're not the sysadmin, we can only change a key that we own */ |
47d804bf | 849 | if (capable(CAP_SYS_ADMIN) || key->uid == current_fsuid()) { |
76d8aeab DH |
850 | key->perm = perm; |
851 | ret = 0; | |
852 | } | |
1da177e4 | 853 | |
1da177e4 LT |
854 | up_write(&key->sem); |
855 | key_put(key); | |
76d8aeab | 856 | error: |
1da177e4 | 857 | return ret; |
a8b17ed0 | 858 | } |
1da177e4 | 859 | |
8bbf4976 | 860 | /* |
973c9f4f DH |
861 | * Get the destination keyring for instantiation and check that the caller has |
862 | * Write permission on it. | |
8bbf4976 DH |
863 | */ |
864 | static long get_instantiation_keyring(key_serial_t ringid, | |
865 | struct request_key_auth *rka, | |
866 | struct key **_dest_keyring) | |
867 | { | |
868 | key_ref_t dkref; | |
869 | ||
eca1bf5b DH |
870 | *_dest_keyring = NULL; |
871 | ||
8bbf4976 | 872 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 873 | if (ringid == 0) |
8bbf4976 | 874 | return 0; |
8bbf4976 DH |
875 | |
876 | /* if a specific keyring is nominated by ID, then use that */ | |
877 | if (ringid > 0) { | |
5593122e | 878 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
8bbf4976 DH |
879 | if (IS_ERR(dkref)) |
880 | return PTR_ERR(dkref); | |
881 | *_dest_keyring = key_ref_to_ptr(dkref); | |
882 | return 0; | |
883 | } | |
884 | ||
885 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
886 | return -EINVAL; | |
887 | ||
888 | /* otherwise specify the destination keyring recorded in the | |
889 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
890 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 891 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
892 | return 0; |
893 | } | |
894 | ||
895 | return -ENOKEY; | |
896 | } | |
897 | ||
d84f4f99 | 898 | /* |
973c9f4f | 899 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
900 | */ |
901 | static int keyctl_change_reqkey_auth(struct key *key) | |
902 | { | |
903 | struct cred *new; | |
904 | ||
905 | new = prepare_creds(); | |
906 | if (!new) | |
907 | return -ENOMEM; | |
908 | ||
909 | key_put(new->request_key_auth); | |
910 | new->request_key_auth = key_get(key); | |
911 | ||
912 | return commit_creds(new); | |
913 | } | |
914 | ||
ee009e4a DH |
915 | /* |
916 | * Copy the iovec data from userspace | |
917 | */ | |
918 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
919 | unsigned ioc) | |
920 | { | |
921 | for (; ioc > 0; ioc--) { | |
922 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
923 | return -EFAULT; | |
924 | buffer += iov->iov_len; | |
925 | iov++; | |
926 | } | |
927 | return 0; | |
928 | } | |
929 | ||
1da177e4 | 930 | /* |
973c9f4f DH |
931 | * Instantiate a key with the specified payload and link the key into the |
932 | * destination keyring if one is given. | |
933 | * | |
934 | * The caller must have the appropriate instantiation permit set for this to | |
935 | * work (see keyctl_assume_authority). No other permissions are required. | |
936 | * | |
937 | * If successful, 0 will be returned. | |
1da177e4 | 938 | */ |
ee009e4a DH |
939 | long keyctl_instantiate_key_common(key_serial_t id, |
940 | const struct iovec *payload_iov, | |
941 | unsigned ioc, | |
942 | size_t plen, | |
943 | key_serial_t ringid) | |
1da177e4 | 944 | { |
d84f4f99 | 945 | const struct cred *cred = current_cred(); |
3e30148c | 946 | struct request_key_auth *rka; |
8bbf4976 | 947 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
948 | void *payload; |
949 | long ret; | |
38bbca6b | 950 | bool vm = false; |
1da177e4 | 951 | |
d84f4f99 DH |
952 | kenter("%d,,%zu,%d", id, plen, ringid); |
953 | ||
1da177e4 | 954 | ret = -EINVAL; |
38bbca6b | 955 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
956 | goto error; |
957 | ||
b5f545c8 DH |
958 | /* the appropriate instantiation authorisation key must have been |
959 | * assumed before calling this */ | |
960 | ret = -EPERM; | |
d84f4f99 | 961 | instkey = cred->request_key_auth; |
b5f545c8 DH |
962 | if (!instkey) |
963 | goto error; | |
964 | ||
965 | rka = instkey->payload.data; | |
966 | if (rka->target_key->serial != id) | |
967 | goto error; | |
968 | ||
1da177e4 LT |
969 | /* pull the payload in if one was supplied */ |
970 | payload = NULL; | |
971 | ||
ee009e4a | 972 | if (payload_iov) { |
1da177e4 LT |
973 | ret = -ENOMEM; |
974 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
975 | if (!payload) { |
976 | if (plen <= PAGE_SIZE) | |
977 | goto error; | |
978 | vm = true; | |
979 | payload = vmalloc(plen); | |
980 | if (!payload) | |
981 | goto error; | |
982 | } | |
1da177e4 | 983 | |
ee009e4a DH |
984 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
985 | if (ret < 0) | |
1da177e4 LT |
986 | goto error2; |
987 | } | |
988 | ||
3e30148c DH |
989 | /* find the destination keyring amongst those belonging to the |
990 | * requesting task */ | |
8bbf4976 DH |
991 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
992 | if (ret < 0) | |
993 | goto error2; | |
1da177e4 LT |
994 | |
995 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 996 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 997 | dest_keyring, instkey); |
1da177e4 | 998 | |
8bbf4976 | 999 | key_put(dest_keyring); |
b5f545c8 DH |
1000 | |
1001 | /* discard the assumed authority if it's just been disabled by | |
1002 | * instantiation of the key */ | |
d84f4f99 DH |
1003 | if (ret == 0) |
1004 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1005 | |
1006 | error2: | |
38bbca6b DH |
1007 | if (!vm) |
1008 | kfree(payload); | |
1009 | else | |
1010 | vfree(payload); | |
b5f545c8 | 1011 | error: |
1da177e4 | 1012 | return ret; |
a8b17ed0 | 1013 | } |
1da177e4 | 1014 | |
ee009e4a DH |
1015 | /* |
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. | |
1023 | */ | |
1024 | long keyctl_instantiate_key(key_serial_t id, | |
1025 | const void __user *_payload, | |
1026 | size_t plen, | |
1027 | key_serial_t ringid) | |
1028 | { | |
1029 | if (_payload && plen) { | |
1030 | struct iovec iov[1] = { | |
1031 | [0].iov_base = (void __user *)_payload, | |
1032 | [0].iov_len = plen | |
1033 | }; | |
1034 | ||
1035 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1036 | } | |
1037 | ||
1038 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Instantiate a key with the specified multipart payload and link the key into | |
1043 | * the destination keyring if one is given. | |
1044 | * | |
1045 | * The caller must have the appropriate instantiation permit set for this to | |
1046 | * work (see keyctl_assume_authority). No other permissions are required. | |
1047 | * | |
1048 | * If successful, 0 will be returned. | |
1049 | */ | |
1050 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1051 | const struct iovec __user *_payload_iov, | |
1052 | unsigned ioc, | |
1053 | key_serial_t ringid) | |
1054 | { | |
1055 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1056 | long ret; | |
1057 | ||
1058 | if (_payload_iov == 0 || ioc == 0) | |
1059 | goto no_payload; | |
1060 | ||
1061 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
1062 | ARRAY_SIZE(iovstack), iovstack, &iov); | |
1063 | if (ret < 0) | |
1064 | return ret; | |
1065 | if (ret == 0) | |
1066 | goto no_payload_free; | |
1067 | ||
1068 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
1069 | ||
1070 | if (iov != iovstack) | |
1071 | kfree(iov); | |
1072 | return ret; | |
1073 | ||
1074 | no_payload_free: | |
1075 | if (iov != iovstack) | |
1076 | kfree(iov); | |
1077 | no_payload: | |
1078 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1079 | } | |
1080 | ||
1da177e4 | 1081 | /* |
973c9f4f DH |
1082 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1083 | * the key into the destination keyring if one is given. | |
1084 | * | |
1085 | * The caller must have the appropriate instantiation permit set for this to | |
1086 | * work (see keyctl_assume_authority). No other permissions are required. | |
1087 | * | |
1088 | * The key and any links to the key will be automatically garbage collected | |
1089 | * after the timeout expires. | |
1090 | * | |
1091 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1092 | * them to return -ENOKEY until the negative key expires. | |
1093 | * | |
1094 | * If successful, 0 will be returned. | |
1da177e4 LT |
1095 | */ |
1096 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1097 | { |
1098 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1103 | * code and link the key into the destination keyring if one is given. | |
1104 | * | |
1105 | * The caller must have the appropriate instantiation permit set for this to | |
1106 | * work (see keyctl_assume_authority). No other permissions are required. | |
1107 | * | |
1108 | * The key and any links to the key will be automatically garbage collected | |
1109 | * after the timeout expires. | |
1110 | * | |
1111 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1112 | * them to return the specified error code until the negative key expires. | |
1113 | * | |
1114 | * If successful, 0 will be returned. | |
1115 | */ | |
1116 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1117 | key_serial_t ringid) | |
1da177e4 | 1118 | { |
d84f4f99 | 1119 | const struct cred *cred = current_cred(); |
3e30148c | 1120 | struct request_key_auth *rka; |
8bbf4976 | 1121 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1122 | long ret; |
1123 | ||
fdd1b945 DH |
1124 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1125 | ||
1126 | /* must be a valid error code and mustn't be a kernel special */ | |
1127 | if (error <= 0 || | |
1128 | error >= MAX_ERRNO || | |
1129 | error == ERESTARTSYS || | |
1130 | error == ERESTARTNOINTR || | |
1131 | error == ERESTARTNOHAND || | |
1132 | error == ERESTART_RESTARTBLOCK) | |
1133 | return -EINVAL; | |
d84f4f99 | 1134 | |
b5f545c8 DH |
1135 | /* the appropriate instantiation authorisation key must have been |
1136 | * assumed before calling this */ | |
1137 | ret = -EPERM; | |
d84f4f99 | 1138 | instkey = cred->request_key_auth; |
b5f545c8 | 1139 | if (!instkey) |
1da177e4 | 1140 | goto error; |
1da177e4 | 1141 | |
3e30148c | 1142 | rka = instkey->payload.data; |
b5f545c8 DH |
1143 | if (rka->target_key->serial != id) |
1144 | goto error; | |
3e30148c | 1145 | |
1da177e4 LT |
1146 | /* find the destination keyring if present (which must also be |
1147 | * writable) */ | |
8bbf4976 DH |
1148 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1149 | if (ret < 0) | |
1150 | goto error; | |
1da177e4 LT |
1151 | |
1152 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1153 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1154 | dest_keyring, instkey); |
1da177e4 | 1155 | |
8bbf4976 | 1156 | key_put(dest_keyring); |
b5f545c8 DH |
1157 | |
1158 | /* discard the assumed authority if it's just been disabled by | |
1159 | * instantiation of the key */ | |
d84f4f99 DH |
1160 | if (ret == 0) |
1161 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1162 | |
1163 | error: | |
1da177e4 | 1164 | return ret; |
a8b17ed0 | 1165 | } |
1da177e4 | 1166 | |
3e30148c | 1167 | /* |
973c9f4f DH |
1168 | * Read or set the default keyring in which request_key() will cache keys and |
1169 | * return the old setting. | |
1170 | * | |
1171 | * If a process keyring is specified then this will be created if it doesn't | |
1172 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1173 | */ |
1174 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1175 | { | |
d84f4f99 DH |
1176 | struct cred *new; |
1177 | int ret, old_setting; | |
1178 | ||
1179 | old_setting = current_cred_xxx(jit_keyring); | |
1180 | ||
1181 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1182 | return old_setting; | |
1183 | ||
1184 | new = prepare_creds(); | |
1185 | if (!new) | |
1186 | return -ENOMEM; | |
3e30148c DH |
1187 | |
1188 | switch (reqkey_defl) { | |
1189 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1190 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1191 | if (ret < 0) |
d84f4f99 | 1192 | goto error; |
3e30148c DH |
1193 | goto set; |
1194 | ||
1195 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1196 | ret = install_process_keyring_to_cred(new); |
1197 | if (ret < 0) { | |
1198 | if (ret != -EEXIST) | |
1199 | goto error; | |
1200 | ret = 0; | |
1201 | } | |
1202 | goto set; | |
3e30148c DH |
1203 | |
1204 | case KEY_REQKEY_DEFL_DEFAULT: | |
1205 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1206 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1207 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1208 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1209 | goto set; | |
3e30148c DH |
1210 | |
1211 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1212 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1213 | default: | |
d84f4f99 DH |
1214 | ret = -EINVAL; |
1215 | goto error; | |
3e30148c DH |
1216 | } |
1217 | ||
d84f4f99 DH |
1218 | set: |
1219 | new->jit_keyring = reqkey_defl; | |
1220 | commit_creds(new); | |
1221 | return old_setting; | |
1222 | error: | |
1223 | abort_creds(new); | |
4303ef19 | 1224 | return ret; |
a8b17ed0 | 1225 | } |
d84f4f99 | 1226 | |
017679c4 | 1227 | /* |
973c9f4f DH |
1228 | * Set or clear the timeout on a key. |
1229 | * | |
1230 | * Either the key must grant the caller Setattr permission or else the caller | |
1231 | * must hold an instantiation authorisation token for the key. | |
1232 | * | |
1233 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1234 | * the current time. The key and any links to the key will be automatically | |
1235 | * garbage collected after the timeout expires. | |
1236 | * | |
1237 | * If successful, 0 is returned. | |
017679c4 DH |
1238 | */ |
1239 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1240 | { | |
1241 | struct timespec now; | |
9156235b | 1242 | struct key *key, *instkey; |
017679c4 DH |
1243 | key_ref_t key_ref; |
1244 | time_t expiry; | |
1245 | long ret; | |
1246 | ||
5593122e DH |
1247 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
1248 | KEY_SETATTR); | |
017679c4 | 1249 | if (IS_ERR(key_ref)) { |
9156235b DH |
1250 | /* setting the timeout on a key under construction is permitted |
1251 | * if we have the authorisation token handy */ | |
1252 | if (PTR_ERR(key_ref) == -EACCES) { | |
1253 | instkey = key_get_instantiation_authkey(id); | |
1254 | if (!IS_ERR(instkey)) { | |
1255 | key_put(instkey); | |
1256 | key_ref = lookup_user_key(id, | |
1257 | KEY_LOOKUP_PARTIAL, | |
1258 | 0); | |
1259 | if (!IS_ERR(key_ref)) | |
1260 | goto okay; | |
1261 | } | |
1262 | } | |
1263 | ||
017679c4 DH |
1264 | ret = PTR_ERR(key_ref); |
1265 | goto error; | |
1266 | } | |
1267 | ||
9156235b | 1268 | okay: |
017679c4 DH |
1269 | key = key_ref_to_ptr(key_ref); |
1270 | ||
1271 | /* make the changes with the locks held to prevent races */ | |
1272 | down_write(&key->sem); | |
1273 | ||
1274 | expiry = 0; | |
1275 | if (timeout > 0) { | |
1276 | now = current_kernel_time(); | |
1277 | expiry = now.tv_sec + timeout; | |
1278 | } | |
1279 | ||
1280 | key->expiry = expiry; | |
c08ef808 | 1281 | key_schedule_gc(key->expiry + key_gc_delay); |
017679c4 DH |
1282 | |
1283 | up_write(&key->sem); | |
1284 | key_put(key); | |
1285 | ||
1286 | ret = 0; | |
1287 | error: | |
1288 | return ret; | |
a8b17ed0 | 1289 | } |
017679c4 | 1290 | |
b5f545c8 | 1291 | /* |
973c9f4f DH |
1292 | * Assume (or clear) the authority to instantiate the specified key. |
1293 | * | |
1294 | * This sets the authoritative token currently in force for key instantiation. | |
1295 | * This must be done for a key to be instantiated. It has the effect of making | |
1296 | * available all the keys from the caller of the request_key() that created a | |
1297 | * key to request_key() calls made by the caller of this function. | |
1298 | * | |
1299 | * The caller must have the instantiation key in their process keyrings with a | |
1300 | * Search permission grant available to the caller. | |
1301 | * | |
1302 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1303 | * | |
1304 | * If the ID given has a matching an authorisation key, then that key will be | |
1305 | * set and its ID will be returned. The authorisation key can be read to get | |
1306 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1307 | */ |
1308 | long keyctl_assume_authority(key_serial_t id) | |
1309 | { | |
1310 | struct key *authkey; | |
1311 | long ret; | |
1312 | ||
1313 | /* special key IDs aren't permitted */ | |
1314 | ret = -EINVAL; | |
1315 | if (id < 0) | |
1316 | goto error; | |
1317 | ||
1318 | /* we divest ourselves of authority if given an ID of 0 */ | |
1319 | if (id == 0) { | |
d84f4f99 | 1320 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1321 | goto error; |
1322 | } | |
1323 | ||
1324 | /* attempt to assume the authority temporarily granted to us whilst we | |
1325 | * instantiate the specified key | |
1326 | * - the authorisation key must be in the current task's keyrings | |
1327 | * somewhere | |
1328 | */ | |
1329 | authkey = key_get_instantiation_authkey(id); | |
1330 | if (IS_ERR(authkey)) { | |
1331 | ret = PTR_ERR(authkey); | |
1332 | goto error; | |
1333 | } | |
1334 | ||
d84f4f99 DH |
1335 | ret = keyctl_change_reqkey_auth(authkey); |
1336 | if (ret < 0) | |
1337 | goto error; | |
1338 | key_put(authkey); | |
b5f545c8 | 1339 | |
d84f4f99 | 1340 | ret = authkey->serial; |
b5f545c8 DH |
1341 | error: |
1342 | return ret; | |
a8b17ed0 | 1343 | } |
b5f545c8 | 1344 | |
70a5bb72 | 1345 | /* |
973c9f4f DH |
1346 | * Get a key's the LSM security label. |
1347 | * | |
1348 | * The key must grant the caller View permission for this to work. | |
1349 | * | |
1350 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1351 | * | |
1352 | * If successful, the amount of information available will be returned, | |
1353 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1354 | */ |
1355 | long keyctl_get_security(key_serial_t keyid, | |
1356 | char __user *buffer, | |
1357 | size_t buflen) | |
1358 | { | |
1359 | struct key *key, *instkey; | |
1360 | key_ref_t key_ref; | |
1361 | char *context; | |
1362 | long ret; | |
1363 | ||
5593122e | 1364 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
70a5bb72 DH |
1365 | if (IS_ERR(key_ref)) { |
1366 | if (PTR_ERR(key_ref) != -EACCES) | |
1367 | return PTR_ERR(key_ref); | |
1368 | ||
1369 | /* viewing a key under construction is also permitted if we | |
1370 | * have the authorisation token handy */ | |
1371 | instkey = key_get_instantiation_authkey(keyid); | |
1372 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1373 | return PTR_ERR(instkey); |
70a5bb72 DH |
1374 | key_put(instkey); |
1375 | ||
5593122e | 1376 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1377 | if (IS_ERR(key_ref)) |
1378 | return PTR_ERR(key_ref); | |
1379 | } | |
1380 | ||
1381 | key = key_ref_to_ptr(key_ref); | |
1382 | ret = security_key_getsecurity(key, &context); | |
1383 | if (ret == 0) { | |
1384 | /* if no information was returned, give userspace an empty | |
1385 | * string */ | |
1386 | ret = 1; | |
1387 | if (buffer && buflen > 0 && | |
1388 | copy_to_user(buffer, "", 1) != 0) | |
1389 | ret = -EFAULT; | |
1390 | } else if (ret > 0) { | |
1391 | /* return as much data as there's room for */ | |
1392 | if (buffer && buflen > 0) { | |
1393 | if (buflen > ret) | |
1394 | buflen = ret; | |
1395 | ||
1396 | if (copy_to_user(buffer, context, buflen) != 0) | |
1397 | ret = -EFAULT; | |
1398 | } | |
1399 | ||
1400 | kfree(context); | |
1401 | } | |
1402 | ||
1403 | key_ref_put(key_ref); | |
1404 | return ret; | |
1405 | } | |
1406 | ||
ee18d64c | 1407 | /* |
973c9f4f DH |
1408 | * Attempt to install the calling process's session keyring on the process's |
1409 | * parent process. | |
1410 | * | |
1411 | * The keyring must exist and must grant the caller LINK permission, and the | |
1412 | * parent process must be single-threaded and must have the same effective | |
1413 | * ownership as this process and mustn't be SUID/SGID. | |
1414 | * | |
1415 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1416 | * | |
1417 | * If successful, 0 will be returned. | |
ee18d64c DH |
1418 | */ |
1419 | long keyctl_session_to_parent(void) | |
1420 | { | |
a00ae4d2 | 1421 | #ifdef TIF_NOTIFY_RESUME |
ee18d64c DH |
1422 | struct task_struct *me, *parent; |
1423 | const struct cred *mycred, *pcred; | |
1424 | struct cred *cred, *oldcred; | |
1425 | key_ref_t keyring_r; | |
1426 | int ret; | |
1427 | ||
1428 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK); | |
1429 | if (IS_ERR(keyring_r)) | |
1430 | return PTR_ERR(keyring_r); | |
1431 | ||
1432 | /* our parent is going to need a new cred struct, a new tgcred struct | |
1433 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1434 | * our parent */ | |
1435 | ret = -ENOMEM; | |
1436 | cred = cred_alloc_blank(); | |
1437 | if (!cred) | |
1438 | goto error_keyring; | |
1439 | ||
1440 | cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r); | |
1441 | keyring_r = NULL; | |
1442 | ||
1443 | me = current; | |
9d1ac65a | 1444 | rcu_read_lock(); |
ee18d64c DH |
1445 | write_lock_irq(&tasklist_lock); |
1446 | ||
1447 | parent = me->real_parent; | |
1448 | ret = -EPERM; | |
1449 | ||
1450 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1451 | if (parent->pid <= 1 || !parent->mm) | |
1452 | goto not_permitted; | |
1453 | ||
1454 | /* the parent must be single threaded */ | |
dd98acf7 | 1455 | if (!thread_group_empty(parent)) |
ee18d64c DH |
1456 | goto not_permitted; |
1457 | ||
1458 | /* the parent and the child must have different session keyrings or | |
1459 | * there's no point */ | |
1460 | mycred = current_cred(); | |
1461 | pcred = __task_cred(parent); | |
1462 | if (mycred == pcred || | |
1463 | mycred->tgcred->session_keyring == pcred->tgcred->session_keyring) | |
1464 | goto already_same; | |
1465 | ||
1466 | /* the parent must have the same effective ownership and mustn't be | |
1467 | * SUID/SGID */ | |
c5b60b5e | 1468 | if (pcred->uid != mycred->euid || |
ee18d64c DH |
1469 | pcred->euid != mycred->euid || |
1470 | pcred->suid != mycred->euid || | |
c5b60b5e | 1471 | pcred->gid != mycred->egid || |
ee18d64c DH |
1472 | pcred->egid != mycred->egid || |
1473 | pcred->sgid != mycred->egid) | |
1474 | goto not_permitted; | |
1475 | ||
1476 | /* the keyrings must have the same UID */ | |
3d96406c DH |
1477 | if ((pcred->tgcred->session_keyring && |
1478 | pcred->tgcred->session_keyring->uid != mycred->euid) || | |
ee18d64c DH |
1479 | mycred->tgcred->session_keyring->uid != mycred->euid) |
1480 | goto not_permitted; | |
1481 | ||
ee18d64c DH |
1482 | /* if there's an already pending keyring replacement, then we replace |
1483 | * that */ | |
1484 | oldcred = parent->replacement_session_keyring; | |
1485 | ||
1486 | /* the replacement session keyring is applied just prior to userspace | |
1487 | * restarting */ | |
1488 | parent->replacement_session_keyring = cred; | |
1489 | cred = NULL; | |
1490 | set_ti_thread_flag(task_thread_info(parent), TIF_NOTIFY_RESUME); | |
1491 | ||
1492 | write_unlock_irq(&tasklist_lock); | |
9d1ac65a | 1493 | rcu_read_unlock(); |
ee18d64c DH |
1494 | if (oldcred) |
1495 | put_cred(oldcred); | |
1496 | return 0; | |
1497 | ||
1498 | already_same: | |
1499 | ret = 0; | |
1500 | not_permitted: | |
5c84342a | 1501 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1502 | rcu_read_unlock(); |
ee18d64c DH |
1503 | put_cred(cred); |
1504 | return ret; | |
1505 | ||
1506 | error_keyring: | |
1507 | key_ref_put(keyring_r); | |
1508 | return ret; | |
a00ae4d2 GU |
1509 | |
1510 | #else /* !TIF_NOTIFY_RESUME */ | |
1511 | /* | |
1512 | * To be removed when TIF_NOTIFY_RESUME has been implemented on | |
1513 | * m68k/xtensa | |
1514 | */ | |
1515 | #warning TIF_NOTIFY_RESUME not implemented | |
1516 | return -EOPNOTSUPP; | |
1517 | #endif /* !TIF_NOTIFY_RESUME */ | |
ee18d64c DH |
1518 | } |
1519 | ||
1da177e4 | 1520 | /* |
973c9f4f | 1521 | * The key control system call |
1da177e4 | 1522 | */ |
938bb9f5 HC |
1523 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1524 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1525 | { |
1526 | switch (option) { | |
1527 | case KEYCTL_GET_KEYRING_ID: | |
1528 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1529 | (int) arg3); | |
1530 | ||
1531 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1532 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1533 | ||
1534 | case KEYCTL_UPDATE: | |
1535 | return keyctl_update_key((key_serial_t) arg2, | |
1536 | (const void __user *) arg3, | |
1537 | (size_t) arg4); | |
1538 | ||
1539 | case KEYCTL_REVOKE: | |
1540 | return keyctl_revoke_key((key_serial_t) arg2); | |
1541 | ||
1542 | case KEYCTL_DESCRIBE: | |
1543 | return keyctl_describe_key((key_serial_t) arg2, | |
1544 | (char __user *) arg3, | |
1545 | (unsigned) arg4); | |
1546 | ||
1547 | case KEYCTL_CLEAR: | |
1548 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1549 | ||
1550 | case KEYCTL_LINK: | |
1551 | return keyctl_keyring_link((key_serial_t) arg2, | |
1552 | (key_serial_t) arg3); | |
1553 | ||
1554 | case KEYCTL_UNLINK: | |
1555 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1556 | (key_serial_t) arg3); | |
1557 | ||
1558 | case KEYCTL_SEARCH: | |
1559 | return keyctl_keyring_search((key_serial_t) arg2, | |
1560 | (const char __user *) arg3, | |
1561 | (const char __user *) arg4, | |
1562 | (key_serial_t) arg5); | |
1563 | ||
1564 | case KEYCTL_READ: | |
1565 | return keyctl_read_key((key_serial_t) arg2, | |
1566 | (char __user *) arg3, | |
1567 | (size_t) arg4); | |
1568 | ||
1569 | case KEYCTL_CHOWN: | |
1570 | return keyctl_chown_key((key_serial_t) arg2, | |
1571 | (uid_t) arg3, | |
1572 | (gid_t) arg4); | |
1573 | ||
1574 | case KEYCTL_SETPERM: | |
1575 | return keyctl_setperm_key((key_serial_t) arg2, | |
1576 | (key_perm_t) arg3); | |
1577 | ||
1578 | case KEYCTL_INSTANTIATE: | |
1579 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1580 | (const void __user *) arg3, | |
1581 | (size_t) arg4, | |
1582 | (key_serial_t) arg5); | |
1583 | ||
1584 | case KEYCTL_NEGATE: | |
1585 | return keyctl_negate_key((key_serial_t) arg2, | |
1586 | (unsigned) arg3, | |
1587 | (key_serial_t) arg4); | |
1588 | ||
3e30148c DH |
1589 | case KEYCTL_SET_REQKEY_KEYRING: |
1590 | return keyctl_set_reqkey_keyring(arg2); | |
1591 | ||
017679c4 DH |
1592 | case KEYCTL_SET_TIMEOUT: |
1593 | return keyctl_set_timeout((key_serial_t) arg2, | |
1594 | (unsigned) arg3); | |
1595 | ||
b5f545c8 DH |
1596 | case KEYCTL_ASSUME_AUTHORITY: |
1597 | return keyctl_assume_authority((key_serial_t) arg2); | |
1598 | ||
70a5bb72 DH |
1599 | case KEYCTL_GET_SECURITY: |
1600 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1601 | (char __user *) arg3, |
70a5bb72 DH |
1602 | (size_t) arg4); |
1603 | ||
ee18d64c DH |
1604 | case KEYCTL_SESSION_TO_PARENT: |
1605 | return keyctl_session_to_parent(); | |
1606 | ||
fdd1b945 DH |
1607 | case KEYCTL_REJECT: |
1608 | return keyctl_reject_key((key_serial_t) arg2, | |
1609 | (unsigned) arg3, | |
1610 | (unsigned) arg4, | |
1611 | (key_serial_t) arg5); | |
1612 | ||
ee009e4a DH |
1613 | case KEYCTL_INSTANTIATE_IOV: |
1614 | return keyctl_instantiate_key_iov( | |
1615 | (key_serial_t) arg2, | |
1616 | (const struct iovec __user *) arg3, | |
1617 | (unsigned) arg4, | |
1618 | (key_serial_t) arg5); | |
1619 | ||
1da177e4 LT |
1620 | default: |
1621 | return -EOPNOTSUPP; | |
1622 | } | |
a8b17ed0 | 1623 | } |