Commit | Line | Data |
---|---|---|
88b4a07e MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * | |
f66e883e | 4 | * Copyright (C) 2004-2008 International Business Machines Corp. |
88b4a07e MH |
5 | * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com> |
6 | * Tyler Hicks <tyhicks@ou.edu> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version | |
10 | * 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
e8edc6e0 | 22 | #include <linux/sched.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
6a3fd92e MH |
24 | #include <linux/user_namespace.h> |
25 | #include <linux/nsproxy.h> | |
88b4a07e MH |
26 | #include "ecryptfs_kernel.h" |
27 | ||
dd2a3b7a MH |
28 | static LIST_HEAD(ecryptfs_msg_ctx_free_list); |
29 | static LIST_HEAD(ecryptfs_msg_ctx_alloc_list); | |
30 | static struct mutex ecryptfs_msg_ctx_lists_mux; | |
88b4a07e | 31 | |
f66e883e MH |
32 | static struct hlist_head *ecryptfs_daemon_hash; |
33 | struct mutex ecryptfs_daemon_hash_mux; | |
a6f80fb7 | 34 | static int ecryptfs_hash_bits; |
2ecaf55d | 35 | #define ecryptfs_current_euid_hash(uid) \ |
cdf8c58a | 36 | hash_long((unsigned long)from_kuid(&init_user_ns, current_euid()), ecryptfs_hash_bits) |
88b4a07e | 37 | |
f66e883e | 38 | static u32 ecryptfs_msg_counter; |
dd2a3b7a | 39 | static struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr; |
88b4a07e MH |
40 | |
41 | /** | |
42 | * ecryptfs_acquire_free_msg_ctx | |
43 | * @msg_ctx: The context that was acquired from the free list | |
44 | * | |
45 | * Acquires a context element from the free list and locks the mutex | |
f66e883e MH |
46 | * on the context. Sets the msg_ctx task to current. Returns zero on |
47 | * success; non-zero on error or upon failure to acquire a free | |
48 | * context element. Must be called with ecryptfs_msg_ctx_lists_mux | |
49 | * held. | |
88b4a07e MH |
50 | */ |
51 | static int ecryptfs_acquire_free_msg_ctx(struct ecryptfs_msg_ctx **msg_ctx) | |
52 | { | |
53 | struct list_head *p; | |
54 | int rc; | |
55 | ||
56 | if (list_empty(&ecryptfs_msg_ctx_free_list)) { | |
f66e883e MH |
57 | printk(KERN_WARNING "%s: The eCryptfs free " |
58 | "context list is empty. It may be helpful to " | |
59 | "specify the ecryptfs_message_buf_len " | |
60 | "parameter to be greater than the current " | |
61 | "value of [%d]\n", __func__, ecryptfs_message_buf_len); | |
88b4a07e MH |
62 | rc = -ENOMEM; |
63 | goto out; | |
64 | } | |
65 | list_for_each(p, &ecryptfs_msg_ctx_free_list) { | |
66 | *msg_ctx = list_entry(p, struct ecryptfs_msg_ctx, node); | |
67 | if (mutex_trylock(&(*msg_ctx)->mux)) { | |
68 | (*msg_ctx)->task = current; | |
69 | rc = 0; | |
70 | goto out; | |
71 | } | |
72 | } | |
73 | rc = -ENOMEM; | |
74 | out: | |
75 | return rc; | |
76 | } | |
77 | ||
78 | /** | |
79 | * ecryptfs_msg_ctx_free_to_alloc | |
80 | * @msg_ctx: The context to move from the free list to the alloc list | |
81 | * | |
f66e883e | 82 | * Must be called with ecryptfs_msg_ctx_lists_mux held. |
88b4a07e MH |
83 | */ |
84 | static void ecryptfs_msg_ctx_free_to_alloc(struct ecryptfs_msg_ctx *msg_ctx) | |
85 | { | |
86 | list_move(&msg_ctx->node, &ecryptfs_msg_ctx_alloc_list); | |
87 | msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_PENDING; | |
88 | msg_ctx->counter = ++ecryptfs_msg_counter; | |
89 | } | |
90 | ||
91 | /** | |
92 | * ecryptfs_msg_ctx_alloc_to_free | |
93 | * @msg_ctx: The context to move from the alloc list to the free list | |
94 | * | |
f66e883e | 95 | * Must be called with ecryptfs_msg_ctx_lists_mux held. |
88b4a07e | 96 | */ |
f66e883e | 97 | void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx) |
88b4a07e MH |
98 | { |
99 | list_move(&(msg_ctx->node), &ecryptfs_msg_ctx_free_list); | |
100 | if (msg_ctx->msg) | |
101 | kfree(msg_ctx->msg); | |
f66e883e | 102 | msg_ctx->msg = NULL; |
88b4a07e MH |
103 | msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_FREE; |
104 | } | |
105 | ||
106 | /** | |
f66e883e | 107 | * ecryptfs_find_daemon_by_euid |
f66e883e | 108 | * @daemon: If return value is zero, points to the desired daemon pointer |
88b4a07e | 109 | * |
f66e883e MH |
110 | * Must be called with ecryptfs_daemon_hash_mux held. |
111 | * | |
2ecaf55d | 112 | * Search the hash list for the current effective user id. |
f66e883e MH |
113 | * |
114 | * Returns zero if the user id exists in the list; non-zero otherwise. | |
88b4a07e | 115 | */ |
2ecaf55d | 116 | int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon) |
88b4a07e | 117 | { |
88b4a07e MH |
118 | int rc; |
119 | ||
b67bfe0d | 120 | hlist_for_each_entry(*daemon, |
2ecaf55d TH |
121 | &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()], |
122 | euid_chain) { | |
cdf8c58a | 123 | if (uid_eq((*daemon)->file->f_cred->euid, current_euid())) { |
88b4a07e MH |
124 | rc = 0; |
125 | goto out; | |
126 | } | |
127 | } | |
128 | rc = -EINVAL; | |
129 | out: | |
130 | return rc; | |
131 | } | |
132 | ||
f66e883e MH |
133 | /** |
134 | * ecryptfs_spawn_daemon - Create and initialize a new daemon struct | |
135 | * @daemon: Pointer to set to newly allocated daemon struct | |
2ecaf55d | 136 | * @file: File used when opening /dev/ecryptfs |
f66e883e MH |
137 | * |
138 | * Must be called ceremoniously while in possession of | |
139 | * ecryptfs_sacred_daemon_hash_mux | |
140 | * | |
141 | * Returns zero on success; non-zero otherwise | |
142 | */ | |
143 | int | |
2ecaf55d | 144 | ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file) |
f66e883e MH |
145 | { |
146 | int rc = 0; | |
147 | ||
148 | (*daemon) = kzalloc(sizeof(**daemon), GFP_KERNEL); | |
149 | if (!(*daemon)) { | |
150 | rc = -ENOMEM; | |
df261c52 | 151 | printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of " |
f66e883e MH |
152 | "GFP_KERNEL memory\n", __func__, sizeof(**daemon)); |
153 | goto out; | |
154 | } | |
2ecaf55d | 155 | (*daemon)->file = file; |
f66e883e MH |
156 | mutex_init(&(*daemon)->mux); |
157 | INIT_LIST_HEAD(&(*daemon)->msg_ctx_out_queue); | |
158 | init_waitqueue_head(&(*daemon)->wait); | |
159 | (*daemon)->num_queued_msg_ctx = 0; | |
160 | hlist_add_head(&(*daemon)->euid_chain, | |
2ecaf55d | 161 | &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()]); |
f66e883e | 162 | out: |
88b4a07e MH |
163 | return rc; |
164 | } | |
165 | ||
f66e883e MH |
166 | /** |
167 | * ecryptfs_exorcise_daemon - Destroy the daemon struct | |
168 | * | |
169 | * Must be called ceremoniously while in possession of | |
170 | * ecryptfs_daemon_hash_mux and the daemon's own mux. | |
171 | */ | |
172 | int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon) | |
173 | { | |
174 | struct ecryptfs_msg_ctx *msg_ctx, *msg_ctx_tmp; | |
175 | int rc = 0; | |
176 | ||
177 | mutex_lock(&daemon->mux); | |
178 | if ((daemon->flags & ECRYPTFS_DAEMON_IN_READ) | |
179 | || (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)) { | |
180 | rc = -EBUSY; | |
f66e883e MH |
181 | mutex_unlock(&daemon->mux); |
182 | goto out; | |
183 | } | |
184 | list_for_each_entry_safe(msg_ctx, msg_ctx_tmp, | |
185 | &daemon->msg_ctx_out_queue, daemon_out_list) { | |
186 | list_del(&msg_ctx->daemon_out_list); | |
187 | daemon->num_queued_msg_ctx--; | |
188 | printk(KERN_WARNING "%s: Warning: dropping message that is in " | |
189 | "the out queue of a dying daemon\n", __func__); | |
190 | ecryptfs_msg_ctx_alloc_to_free(msg_ctx); | |
191 | } | |
192 | hlist_del(&daemon->euid_chain); | |
f66e883e | 193 | mutex_unlock(&daemon->mux); |
00fcf2cb | 194 | kzfree(daemon); |
f66e883e | 195 | out: |
88b4a07e MH |
196 | return rc; |
197 | } | |
198 | ||
88b4a07e MH |
199 | /** |
200 | * ecryptfs_process_reponse | |
201 | * @msg: The ecryptfs message received; the caller should sanity check | |
f66e883e | 202 | * msg->data_len and free the memory |
f66e883e MH |
203 | * @seq: The sequence number of the message; must match the sequence |
204 | * number for the existing message context waiting for this | |
205 | * response | |
206 | * | |
207 | * Processes a response message after sending an operation request to | |
208 | * userspace. Some other process is awaiting this response. Before | |
209 | * sending out its first communications, the other process allocated a | |
210 | * msg_ctx from the ecryptfs_msg_ctx_arr at a particular index. The | |
211 | * response message contains this index so that we can copy over the | |
212 | * response message into the msg_ctx that the process holds a | |
213 | * reference to. The other process is going to wake up, check to see | |
214 | * that msg_ctx->state == ECRYPTFS_MSG_CTX_STATE_DONE, and then | |
215 | * proceed to read off and process the response message. Returns zero | |
216 | * upon delivery to desired context element; non-zero upon delivery | |
217 | * failure or error. | |
88b4a07e | 218 | * |
f66e883e | 219 | * Returns zero on success; non-zero otherwise |
88b4a07e | 220 | */ |
2ecaf55d TH |
221 | int ecryptfs_process_response(struct ecryptfs_daemon *daemon, |
222 | struct ecryptfs_message *msg, u32 seq) | |
88b4a07e | 223 | { |
88b4a07e | 224 | struct ecryptfs_msg_ctx *msg_ctx; |
f66e883e | 225 | size_t msg_size; |
88b4a07e MH |
226 | int rc; |
227 | ||
228 | if (msg->index >= ecryptfs_message_buf_len) { | |
229 | rc = -EINVAL; | |
f66e883e MH |
230 | printk(KERN_ERR "%s: Attempt to reference " |
231 | "context buffer at index [%d]; maximum " | |
232 | "allowable is [%d]\n", __func__, msg->index, | |
233 | (ecryptfs_message_buf_len - 1)); | |
88b4a07e MH |
234 | goto out; |
235 | } | |
236 | msg_ctx = &ecryptfs_msg_ctx_arr[msg->index]; | |
237 | mutex_lock(&msg_ctx->mux); | |
88b4a07e MH |
238 | if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) { |
239 | rc = -EINVAL; | |
f66e883e MH |
240 | printk(KERN_WARNING "%s: Desired context element is not " |
241 | "pending a response\n", __func__); | |
88b4a07e MH |
242 | goto unlock; |
243 | } else if (msg_ctx->counter != seq) { | |
244 | rc = -EINVAL; | |
f66e883e MH |
245 | printk(KERN_WARNING "%s: Invalid message sequence; " |
246 | "expected [%d]; received [%d]\n", __func__, | |
247 | msg_ctx->counter, seq); | |
88b4a07e MH |
248 | goto unlock; |
249 | } | |
f66e883e | 250 | msg_size = (sizeof(*msg) + msg->data_len); |
88b4a07e MH |
251 | msg_ctx->msg = kmalloc(msg_size, GFP_KERNEL); |
252 | if (!msg_ctx->msg) { | |
253 | rc = -ENOMEM; | |
df261c52 | 254 | printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of " |
f66e883e | 255 | "GFP_KERNEL memory\n", __func__, msg_size); |
88b4a07e MH |
256 | goto unlock; |
257 | } | |
258 | memcpy(msg_ctx->msg, msg, msg_size); | |
259 | msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_DONE; | |
88b4a07e | 260 | wake_up_process(msg_ctx->task); |
2ecaf55d | 261 | rc = 0; |
88b4a07e MH |
262 | unlock: |
263 | mutex_unlock(&msg_ctx->mux); | |
264 | out: | |
265 | return rc; | |
266 | } | |
267 | ||
268 | /** | |
f66e883e | 269 | * ecryptfs_send_message_locked |
88b4a07e MH |
270 | * @data: The data to send |
271 | * @data_len: The length of data | |
272 | * @msg_ctx: The message context allocated for the send | |
f66e883e MH |
273 | * |
274 | * Must be called with ecryptfs_daemon_hash_mux held. | |
275 | * | |
276 | * Returns zero on success; non-zero otherwise | |
88b4a07e | 277 | */ |
f66e883e | 278 | static int |
624ae528 TH |
279 | ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type, |
280 | struct ecryptfs_msg_ctx **msg_ctx) | |
88b4a07e | 281 | { |
f66e883e | 282 | struct ecryptfs_daemon *daemon; |
88b4a07e MH |
283 | int rc; |
284 | ||
2ecaf55d | 285 | rc = ecryptfs_find_daemon_by_euid(&daemon); |
f66e883e | 286 | if (rc || !daemon) { |
88b4a07e | 287 | rc = -ENOTCONN; |
88b4a07e MH |
288 | goto out; |
289 | } | |
88b4a07e MH |
290 | mutex_lock(&ecryptfs_msg_ctx_lists_mux); |
291 | rc = ecryptfs_acquire_free_msg_ctx(msg_ctx); | |
292 | if (rc) { | |
293 | mutex_unlock(&ecryptfs_msg_ctx_lists_mux); | |
f66e883e MH |
294 | printk(KERN_WARNING "%s: Could not claim a free " |
295 | "context element\n", __func__); | |
88b4a07e MH |
296 | goto out; |
297 | } | |
298 | ecryptfs_msg_ctx_free_to_alloc(*msg_ctx); | |
299 | mutex_unlock(&(*msg_ctx)->mux); | |
300 | mutex_unlock(&ecryptfs_msg_ctx_lists_mux); | |
624ae528 TH |
301 | rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0, |
302 | daemon); | |
f66e883e MH |
303 | if (rc) |
304 | printk(KERN_ERR "%s: Error attempting to send message to " | |
305 | "userspace daemon; rc = [%d]\n", __func__, rc); | |
88b4a07e MH |
306 | out: |
307 | return rc; | |
308 | } | |
309 | ||
f66e883e MH |
310 | /** |
311 | * ecryptfs_send_message | |
f66e883e MH |
312 | * @data: The data to send |
313 | * @data_len: The length of data | |
314 | * @msg_ctx: The message context allocated for the send | |
315 | * | |
316 | * Grabs ecryptfs_daemon_hash_mux. | |
317 | * | |
318 | * Returns zero on success; non-zero otherwise | |
319 | */ | |
624ae528 | 320 | int ecryptfs_send_message(char *data, int data_len, |
f66e883e MH |
321 | struct ecryptfs_msg_ctx **msg_ctx) |
322 | { | |
323 | int rc; | |
324 | ||
325 | mutex_lock(&ecryptfs_daemon_hash_mux); | |
624ae528 TH |
326 | rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST, |
327 | msg_ctx); | |
f66e883e MH |
328 | mutex_unlock(&ecryptfs_daemon_hash_mux); |
329 | return rc; | |
330 | } | |
331 | ||
88b4a07e MH |
332 | /** |
333 | * ecryptfs_wait_for_response | |
334 | * @msg_ctx: The context that was assigned when sending a message | |
335 | * @msg: The incoming message from userspace; not set if rc != 0 | |
336 | * | |
337 | * Sleeps until awaken by ecryptfs_receive_message or until the amount | |
338 | * of time exceeds ecryptfs_message_wait_timeout. If zero is | |
339 | * returned, msg will point to a valid message from userspace; a | |
340 | * non-zero value is returned upon failure to receive a message or an | |
f66e883e | 341 | * error occurs. Callee must free @msg on success. |
88b4a07e MH |
342 | */ |
343 | int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx, | |
344 | struct ecryptfs_message **msg) | |
345 | { | |
346 | signed long timeout = ecryptfs_message_wait_timeout * HZ; | |
347 | int rc = 0; | |
348 | ||
349 | sleep: | |
350 | timeout = schedule_timeout_interruptible(timeout); | |
351 | mutex_lock(&ecryptfs_msg_ctx_lists_mux); | |
352 | mutex_lock(&msg_ctx->mux); | |
353 | if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_DONE) { | |
354 | if (timeout) { | |
355 | mutex_unlock(&msg_ctx->mux); | |
356 | mutex_unlock(&ecryptfs_msg_ctx_lists_mux); | |
357 | goto sleep; | |
358 | } | |
359 | rc = -ENOMSG; | |
360 | } else { | |
361 | *msg = msg_ctx->msg; | |
362 | msg_ctx->msg = NULL; | |
363 | } | |
364 | ecryptfs_msg_ctx_alloc_to_free(msg_ctx); | |
365 | mutex_unlock(&msg_ctx->mux); | |
366 | mutex_unlock(&ecryptfs_msg_ctx_lists_mux); | |
367 | return rc; | |
368 | } | |
369 | ||
7371a382 | 370 | int __init ecryptfs_init_messaging(void) |
88b4a07e MH |
371 | { |
372 | int i; | |
373 | int rc = 0; | |
374 | ||
375 | if (ecryptfs_number_of_users > ECRYPTFS_MAX_NUM_USERS) { | |
376 | ecryptfs_number_of_users = ECRYPTFS_MAX_NUM_USERS; | |
f66e883e MH |
377 | printk(KERN_WARNING "%s: Specified number of users is " |
378 | "too large, defaulting to [%d] users\n", __func__, | |
379 | ecryptfs_number_of_users); | |
88b4a07e | 380 | } |
f66e883e MH |
381 | mutex_init(&ecryptfs_daemon_hash_mux); |
382 | mutex_lock(&ecryptfs_daemon_hash_mux); | |
a6f80fb7 AO |
383 | ecryptfs_hash_bits = 1; |
384 | while (ecryptfs_number_of_users >> ecryptfs_hash_bits) | |
385 | ecryptfs_hash_bits++; | |
f66e883e | 386 | ecryptfs_daemon_hash = kmalloc((sizeof(struct hlist_head) |
a6f80fb7 AO |
387 | * (1 << ecryptfs_hash_bits)), |
388 | GFP_KERNEL); | |
f66e883e | 389 | if (!ecryptfs_daemon_hash) { |
88b4a07e | 390 | rc = -ENOMEM; |
f66e883e MH |
391 | printk(KERN_ERR "%s: Failed to allocate memory\n", __func__); |
392 | mutex_unlock(&ecryptfs_daemon_hash_mux); | |
88b4a07e MH |
393 | goto out; |
394 | } | |
a6f80fb7 | 395 | for (i = 0; i < (1 << ecryptfs_hash_bits); i++) |
f66e883e MH |
396 | INIT_HLIST_HEAD(&ecryptfs_daemon_hash[i]); |
397 | mutex_unlock(&ecryptfs_daemon_hash_mux); | |
88b4a07e | 398 | ecryptfs_msg_ctx_arr = kmalloc((sizeof(struct ecryptfs_msg_ctx) |
f66e883e MH |
399 | * ecryptfs_message_buf_len), |
400 | GFP_KERNEL); | |
88b4a07e MH |
401 | if (!ecryptfs_msg_ctx_arr) { |
402 | rc = -ENOMEM; | |
f66e883e | 403 | printk(KERN_ERR "%s: Failed to allocate memory\n", __func__); |
88b4a07e MH |
404 | goto out; |
405 | } | |
406 | mutex_init(&ecryptfs_msg_ctx_lists_mux); | |
407 | mutex_lock(&ecryptfs_msg_ctx_lists_mux); | |
408 | ecryptfs_msg_counter = 0; | |
409 | for (i = 0; i < ecryptfs_message_buf_len; i++) { | |
410 | INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].node); | |
f66e883e | 411 | INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].daemon_out_list); |
88b4a07e MH |
412 | mutex_init(&ecryptfs_msg_ctx_arr[i].mux); |
413 | mutex_lock(&ecryptfs_msg_ctx_arr[i].mux); | |
414 | ecryptfs_msg_ctx_arr[i].index = i; | |
415 | ecryptfs_msg_ctx_arr[i].state = ECRYPTFS_MSG_CTX_STATE_FREE; | |
416 | ecryptfs_msg_ctx_arr[i].counter = 0; | |
417 | ecryptfs_msg_ctx_arr[i].task = NULL; | |
418 | ecryptfs_msg_ctx_arr[i].msg = NULL; | |
419 | list_add_tail(&ecryptfs_msg_ctx_arr[i].node, | |
420 | &ecryptfs_msg_ctx_free_list); | |
421 | mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux); | |
422 | } | |
423 | mutex_unlock(&ecryptfs_msg_ctx_lists_mux); | |
624ae528 TH |
424 | rc = ecryptfs_init_ecryptfs_miscdev(); |
425 | if (rc) | |
426 | ecryptfs_release_messaging(); | |
88b4a07e MH |
427 | out: |
428 | return rc; | |
429 | } | |
430 | ||
624ae528 | 431 | void ecryptfs_release_messaging(void) |
88b4a07e MH |
432 | { |
433 | if (ecryptfs_msg_ctx_arr) { | |
434 | int i; | |
435 | ||
436 | mutex_lock(&ecryptfs_msg_ctx_lists_mux); | |
437 | for (i = 0; i < ecryptfs_message_buf_len; i++) { | |
438 | mutex_lock(&ecryptfs_msg_ctx_arr[i].mux); | |
439 | if (ecryptfs_msg_ctx_arr[i].msg) | |
440 | kfree(ecryptfs_msg_ctx_arr[i].msg); | |
441 | mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux); | |
442 | } | |
443 | kfree(ecryptfs_msg_ctx_arr); | |
444 | mutex_unlock(&ecryptfs_msg_ctx_lists_mux); | |
445 | } | |
f66e883e | 446 | if (ecryptfs_daemon_hash) { |
f66e883e | 447 | struct ecryptfs_daemon *daemon; |
88b4a07e MH |
448 | int i; |
449 | ||
f66e883e | 450 | mutex_lock(&ecryptfs_daemon_hash_mux); |
a6f80fb7 | 451 | for (i = 0; i < (1 << ecryptfs_hash_bits); i++) { |
f66e883e MH |
452 | int rc; |
453 | ||
b67bfe0d | 454 | hlist_for_each_entry(daemon, |
f66e883e MH |
455 | &ecryptfs_daemon_hash[i], |
456 | euid_chain) { | |
457 | rc = ecryptfs_exorcise_daemon(daemon); | |
458 | if (rc) | |
459 | printk(KERN_ERR "%s: Error whilst " | |
460 | "attempting to destroy daemon; " | |
461 | "rc = [%d]. Dazed and confused, " | |
462 | "but trying to continue.\n", | |
463 | __func__, rc); | |
88b4a07e MH |
464 | } |
465 | } | |
f66e883e MH |
466 | kfree(ecryptfs_daemon_hash); |
467 | mutex_unlock(&ecryptfs_daemon_hash_mux); | |
88b4a07e | 468 | } |
624ae528 | 469 | ecryptfs_destroy_ecryptfs_miscdev(); |
88b4a07e MH |
470 | return; |
471 | } |