blob: e57380e5f6bd78fb983b10e292919d29eba19abc [file] [log] [blame]
Michael Halcrow88b4a072007-02-12 00:53:43 -08001/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
Michael Halcrowf66e8832008-04-29 00:59:51 -07004 * Copyright (C) 2004-2008 International Business Machines Corp.
Michael Halcrow88b4a072007-02-12 00:53:43 -08005 * 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 */
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040022#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Michael Halcrow6a3fd922008-04-29 00:59:52 -070024#include <linux/user_namespace.h>
25#include <linux/nsproxy.h>
Michael Halcrow88b4a072007-02-12 00:53:43 -080026#include "ecryptfs_kernel.h"
27
Michael Halcrowdd2a3b72007-02-12 00:53:46 -080028static LIST_HEAD(ecryptfs_msg_ctx_free_list);
29static LIST_HEAD(ecryptfs_msg_ctx_alloc_list);
30static struct mutex ecryptfs_msg_ctx_lists_mux;
Michael Halcrow88b4a072007-02-12 00:53:43 -080031
Michael Halcrowf66e8832008-04-29 00:59:51 -070032static struct hlist_head *ecryptfs_daemon_hash;
33struct mutex ecryptfs_daemon_hash_mux;
Andre Osterhuesa6f80fb2010-07-13 15:59:17 -050034static int ecryptfs_hash_bits;
Tyler Hicks2ecaf552012-06-11 09:47:47 -070035#define ecryptfs_current_euid_hash(uid) \
Eric W. Biedermancdf8c582012-02-07 16:24:33 -080036 hash_long((unsigned long)from_kuid(&init_user_ns, current_euid()), ecryptfs_hash_bits)
Michael Halcrow88b4a072007-02-12 00:53:43 -080037
Michael Halcrowf66e8832008-04-29 00:59:51 -070038static u32 ecryptfs_msg_counter;
Michael Halcrowdd2a3b72007-02-12 00:53:46 -080039static struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
Michael Halcrow88b4a072007-02-12 00:53:43 -080040
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
Michael Halcrowf66e8832008-04-29 00:59:51 -070046 * 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.
Michael Halcrow88b4a072007-02-12 00:53:43 -080050 */
51static 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)) {
Michael Halcrowf66e8832008-04-29 00:59:51 -070057 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);
Michael Halcrow88b4a072007-02-12 00:53:43 -080062 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;
74out:
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 *
Michael Halcrowf66e8832008-04-29 00:59:51 -070082 * Must be called with ecryptfs_msg_ctx_lists_mux held.
Michael Halcrow88b4a072007-02-12 00:53:43 -080083 */
84static 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 *
Michael Halcrowf66e8832008-04-29 00:59:51 -070095 * Must be called with ecryptfs_msg_ctx_lists_mux held.
Michael Halcrow88b4a072007-02-12 00:53:43 -080096 */
Michael Halcrowf66e8832008-04-29 00:59:51 -070097void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
Michael Halcrow88b4a072007-02-12 00:53:43 -080098{
99 list_move(&(msg_ctx->node), &ecryptfs_msg_ctx_free_list);
Tim Gardner1101d582013-02-12 11:03:49 -0700100 kfree(msg_ctx->msg);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700101 msg_ctx->msg = NULL;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800102 msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_FREE;
103}
104
105/**
Michael Halcrowf66e8832008-04-29 00:59:51 -0700106 * ecryptfs_find_daemon_by_euid
Michael Halcrowf66e8832008-04-29 00:59:51 -0700107 * @daemon: If return value is zero, points to the desired daemon pointer
Michael Halcrow88b4a072007-02-12 00:53:43 -0800108 *
Michael Halcrowf66e8832008-04-29 00:59:51 -0700109 * Must be called with ecryptfs_daemon_hash_mux held.
110 *
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700111 * Search the hash list for the current effective user id.
Michael Halcrowf66e8832008-04-29 00:59:51 -0700112 *
113 * Returns zero if the user id exists in the list; non-zero otherwise.
Michael Halcrow88b4a072007-02-12 00:53:43 -0800114 */
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700115int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon)
Michael Halcrow88b4a072007-02-12 00:53:43 -0800116{
Michael Halcrow88b4a072007-02-12 00:53:43 -0800117 int rc;
118
Sasha Levinb67bfe02013-02-27 17:06:00 -0800119 hlist_for_each_entry(*daemon,
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700120 &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()],
121 euid_chain) {
Eric W. Biedermancdf8c582012-02-07 16:24:33 -0800122 if (uid_eq((*daemon)->file->f_cred->euid, current_euid())) {
Michael Halcrow88b4a072007-02-12 00:53:43 -0800123 rc = 0;
124 goto out;
125 }
126 }
127 rc = -EINVAL;
128out:
129 return rc;
130}
131
Michael Halcrowf66e8832008-04-29 00:59:51 -0700132/**
133 * ecryptfs_spawn_daemon - Create and initialize a new daemon struct
134 * @daemon: Pointer to set to newly allocated daemon struct
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700135 * @file: File used when opening /dev/ecryptfs
Michael Halcrowf66e8832008-04-29 00:59:51 -0700136 *
137 * Must be called ceremoniously while in possession of
138 * ecryptfs_sacred_daemon_hash_mux
139 *
140 * Returns zero on success; non-zero otherwise
141 */
142int
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700143ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file)
Michael Halcrowf66e8832008-04-29 00:59:51 -0700144{
145 int rc = 0;
146
147 (*daemon) = kzalloc(sizeof(**daemon), GFP_KERNEL);
148 if (!(*daemon)) {
149 rc = -ENOMEM;
Michael Halcrowdf261c52009-01-06 14:42:02 -0800150 printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of "
Michael Halcrowf66e8832008-04-29 00:59:51 -0700151 "GFP_KERNEL memory\n", __func__, sizeof(**daemon));
152 goto out;
153 }
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700154 (*daemon)->file = file;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700155 mutex_init(&(*daemon)->mux);
156 INIT_LIST_HEAD(&(*daemon)->msg_ctx_out_queue);
157 init_waitqueue_head(&(*daemon)->wait);
158 (*daemon)->num_queued_msg_ctx = 0;
159 hlist_add_head(&(*daemon)->euid_chain,
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700160 &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()]);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700161out:
Michael Halcrow88b4a072007-02-12 00:53:43 -0800162 return rc;
163}
164
165/**
Michael Halcrowf66e8832008-04-29 00:59:51 -0700166 * ecryptfs_exorcise_daemon - Destroy the daemon struct
167 *
168 * Must be called ceremoniously while in possession of
169 * ecryptfs_daemon_hash_mux and the daemon's own mux.
170 */
171int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon)
172{
173 struct ecryptfs_msg_ctx *msg_ctx, *msg_ctx_tmp;
174 int rc = 0;
175
176 mutex_lock(&daemon->mux);
177 if ((daemon->flags & ECRYPTFS_DAEMON_IN_READ)
178 || (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)) {
179 rc = -EBUSY;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700180 mutex_unlock(&daemon->mux);
181 goto out;
182 }
183 list_for_each_entry_safe(msg_ctx, msg_ctx_tmp,
184 &daemon->msg_ctx_out_queue, daemon_out_list) {
185 list_del(&msg_ctx->daemon_out_list);
186 daemon->num_queued_msg_ctx--;
187 printk(KERN_WARNING "%s: Warning: dropping message that is in "
188 "the out queue of a dying daemon\n", __func__);
189 ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
190 }
191 hlist_del(&daemon->euid_chain);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700192 mutex_unlock(&daemon->mux);
Johannes Weiner00fcf2c2009-03-31 15:24:42 -0700193 kzfree(daemon);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700194out:
Michael Halcrow88b4a072007-02-12 00:53:43 -0800195 return rc;
196}
197
198/**
Michael Halcrow88b4a072007-02-12 00:53:43 -0800199 * ecryptfs_process_reponse
200 * @msg: The ecryptfs message received; the caller should sanity check
Michael Halcrowf66e8832008-04-29 00:59:51 -0700201 * msg->data_len and free the memory
Michael Halcrowf66e8832008-04-29 00:59:51 -0700202 * @seq: The sequence number of the message; must match the sequence
203 * number for the existing message context waiting for this
204 * response
Michael Halcrow88b4a072007-02-12 00:53:43 -0800205 *
Michael Halcrowf66e8832008-04-29 00:59:51 -0700206 * Processes a response message after sending an operation request to
207 * userspace. Some other process is awaiting this response. Before
208 * sending out its first communications, the other process allocated a
209 * msg_ctx from the ecryptfs_msg_ctx_arr at a particular index. The
210 * response message contains this index so that we can copy over the
211 * response message into the msg_ctx that the process holds a
212 * reference to. The other process is going to wake up, check to see
213 * that msg_ctx->state == ECRYPTFS_MSG_CTX_STATE_DONE, and then
214 * proceed to read off and process the response message. Returns zero
215 * upon delivery to desired context element; non-zero upon delivery
216 * failure or error.
217 *
218 * Returns zero on success; non-zero otherwise
Michael Halcrow88b4a072007-02-12 00:53:43 -0800219 */
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700220int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
221 struct ecryptfs_message *msg, u32 seq)
Michael Halcrow88b4a072007-02-12 00:53:43 -0800222{
Michael Halcrow88b4a072007-02-12 00:53:43 -0800223 struct ecryptfs_msg_ctx *msg_ctx;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700224 size_t msg_size;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800225 int rc;
226
227 if (msg->index >= ecryptfs_message_buf_len) {
228 rc = -EINVAL;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700229 printk(KERN_ERR "%s: Attempt to reference "
230 "context buffer at index [%d]; maximum "
231 "allowable is [%d]\n", __func__, msg->index,
232 (ecryptfs_message_buf_len - 1));
Michael Halcrow88b4a072007-02-12 00:53:43 -0800233 goto out;
234 }
235 msg_ctx = &ecryptfs_msg_ctx_arr[msg->index];
236 mutex_lock(&msg_ctx->mux);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800237 if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
238 rc = -EINVAL;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700239 printk(KERN_WARNING "%s: Desired context element is not "
240 "pending a response\n", __func__);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800241 goto unlock;
242 } else if (msg_ctx->counter != seq) {
243 rc = -EINVAL;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700244 printk(KERN_WARNING "%s: Invalid message sequence; "
245 "expected [%d]; received [%d]\n", __func__,
246 msg_ctx->counter, seq);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800247 goto unlock;
248 }
Michael Halcrowf66e8832008-04-29 00:59:51 -0700249 msg_size = (sizeof(*msg) + msg->data_len);
Thomas Meyerfc8b14d2013-06-01 11:39:36 +0200250 msg_ctx->msg = kmemdup(msg, msg_size, GFP_KERNEL);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800251 if (!msg_ctx->msg) {
252 rc = -ENOMEM;
Michael Halcrowdf261c52009-01-06 14:42:02 -0800253 printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of "
Michael Halcrowf66e8832008-04-29 00:59:51 -0700254 "GFP_KERNEL memory\n", __func__, msg_size);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800255 goto unlock;
256 }
Michael Halcrow88b4a072007-02-12 00:53:43 -0800257 msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_DONE;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800258 wake_up_process(msg_ctx->task);
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700259 rc = 0;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800260unlock:
261 mutex_unlock(&msg_ctx->mux);
262out:
263 return rc;
264}
265
266/**
Michael Halcrowf66e8832008-04-29 00:59:51 -0700267 * ecryptfs_send_message_locked
Michael Halcrow88b4a072007-02-12 00:53:43 -0800268 * @data: The data to send
269 * @data_len: The length of data
270 * @msg_ctx: The message context allocated for the send
Michael Halcrowf66e8832008-04-29 00:59:51 -0700271 *
272 * Must be called with ecryptfs_daemon_hash_mux held.
273 *
274 * Returns zero on success; non-zero otherwise
Michael Halcrow88b4a072007-02-12 00:53:43 -0800275 */
Michael Halcrowf66e8832008-04-29 00:59:51 -0700276static int
Tyler Hicks624ae522008-10-15 22:02:51 -0700277ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
278 struct ecryptfs_msg_ctx **msg_ctx)
Michael Halcrow88b4a072007-02-12 00:53:43 -0800279{
Michael Halcrowf66e8832008-04-29 00:59:51 -0700280 struct ecryptfs_daemon *daemon;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800281 int rc;
282
Tyler Hicks2ecaf552012-06-11 09:47:47 -0700283 rc = ecryptfs_find_daemon_by_euid(&daemon);
Tyler Hicks1111eae2013-02-27 11:37:48 -0800284 if (rc) {
Michael Halcrow88b4a072007-02-12 00:53:43 -0800285 rc = -ENOTCONN;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800286 goto out;
287 }
Michael Halcrow88b4a072007-02-12 00:53:43 -0800288 mutex_lock(&ecryptfs_msg_ctx_lists_mux);
289 rc = ecryptfs_acquire_free_msg_ctx(msg_ctx);
290 if (rc) {
291 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700292 printk(KERN_WARNING "%s: Could not claim a free "
293 "context element\n", __func__);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800294 goto out;
295 }
296 ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
297 mutex_unlock(&(*msg_ctx)->mux);
298 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
Tyler Hicks624ae522008-10-15 22:02:51 -0700299 rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
300 daemon);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700301 if (rc)
302 printk(KERN_ERR "%s: Error attempting to send message to "
303 "userspace daemon; rc = [%d]\n", __func__, rc);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800304out:
305 return rc;
306}
307
308/**
Michael Halcrowf66e8832008-04-29 00:59:51 -0700309 * ecryptfs_send_message
Michael Halcrowf66e8832008-04-29 00:59:51 -0700310 * @data: The data to send
311 * @data_len: The length of data
312 * @msg_ctx: The message context allocated for the send
313 *
314 * Grabs ecryptfs_daemon_hash_mux.
315 *
316 * Returns zero on success; non-zero otherwise
317 */
Tyler Hicks624ae522008-10-15 22:02:51 -0700318int ecryptfs_send_message(char *data, int data_len,
Michael Halcrowf66e8832008-04-29 00:59:51 -0700319 struct ecryptfs_msg_ctx **msg_ctx)
320{
321 int rc;
322
323 mutex_lock(&ecryptfs_daemon_hash_mux);
Tyler Hicks624ae522008-10-15 22:02:51 -0700324 rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
325 msg_ctx);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700326 mutex_unlock(&ecryptfs_daemon_hash_mux);
327 return rc;
328}
329
330/**
Michael Halcrow88b4a072007-02-12 00:53:43 -0800331 * ecryptfs_wait_for_response
332 * @msg_ctx: The context that was assigned when sending a message
333 * @msg: The incoming message from userspace; not set if rc != 0
334 *
335 * Sleeps until awaken by ecryptfs_receive_message or until the amount
336 * of time exceeds ecryptfs_message_wait_timeout. If zero is
337 * returned, msg will point to a valid message from userspace; a
338 * non-zero value is returned upon failure to receive a message or an
Michael Halcrowf66e8832008-04-29 00:59:51 -0700339 * error occurs. Callee must free @msg on success.
Michael Halcrow88b4a072007-02-12 00:53:43 -0800340 */
341int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
342 struct ecryptfs_message **msg)
343{
344 signed long timeout = ecryptfs_message_wait_timeout * HZ;
345 int rc = 0;
346
347sleep:
348 timeout = schedule_timeout_interruptible(timeout);
349 mutex_lock(&ecryptfs_msg_ctx_lists_mux);
350 mutex_lock(&msg_ctx->mux);
351 if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_DONE) {
352 if (timeout) {
353 mutex_unlock(&msg_ctx->mux);
354 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
355 goto sleep;
356 }
357 rc = -ENOMSG;
358 } else {
359 *msg = msg_ctx->msg;
360 msg_ctx->msg = NULL;
361 }
362 ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
363 mutex_unlock(&msg_ctx->mux);
364 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
365 return rc;
366}
367
Jerome Marchand7371a382010-08-17 17:24:05 +0200368int __init ecryptfs_init_messaging(void)
Michael Halcrow88b4a072007-02-12 00:53:43 -0800369{
370 int i;
371 int rc = 0;
372
373 if (ecryptfs_number_of_users > ECRYPTFS_MAX_NUM_USERS) {
374 ecryptfs_number_of_users = ECRYPTFS_MAX_NUM_USERS;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700375 printk(KERN_WARNING "%s: Specified number of users is "
376 "too large, defaulting to [%d] users\n", __func__,
377 ecryptfs_number_of_users);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800378 }
Michael Halcrowf66e8832008-04-29 00:59:51 -0700379 mutex_init(&ecryptfs_daemon_hash_mux);
380 mutex_lock(&ecryptfs_daemon_hash_mux);
Andre Osterhuesa6f80fb2010-07-13 15:59:17 -0500381 ecryptfs_hash_bits = 1;
382 while (ecryptfs_number_of_users >> ecryptfs_hash_bits)
383 ecryptfs_hash_bits++;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700384 ecryptfs_daemon_hash = kmalloc((sizeof(struct hlist_head)
Andre Osterhuesa6f80fb2010-07-13 15:59:17 -0500385 * (1 << ecryptfs_hash_bits)),
386 GFP_KERNEL);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700387 if (!ecryptfs_daemon_hash) {
Michael Halcrow88b4a072007-02-12 00:53:43 -0800388 rc = -ENOMEM;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700389 printk(KERN_ERR "%s: Failed to allocate memory\n", __func__);
390 mutex_unlock(&ecryptfs_daemon_hash_mux);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800391 goto out;
392 }
Andre Osterhuesa6f80fb2010-07-13 15:59:17 -0500393 for (i = 0; i < (1 << ecryptfs_hash_bits); i++)
Michael Halcrowf66e8832008-04-29 00:59:51 -0700394 INIT_HLIST_HEAD(&ecryptfs_daemon_hash[i]);
395 mutex_unlock(&ecryptfs_daemon_hash_mux);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800396 ecryptfs_msg_ctx_arr = kmalloc((sizeof(struct ecryptfs_msg_ctx)
Michael Halcrowf66e8832008-04-29 00:59:51 -0700397 * ecryptfs_message_buf_len),
398 GFP_KERNEL);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800399 if (!ecryptfs_msg_ctx_arr) {
400 rc = -ENOMEM;
Michael Halcrowf66e8832008-04-29 00:59:51 -0700401 printk(KERN_ERR "%s: Failed to allocate memory\n", __func__);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800402 goto out;
403 }
404 mutex_init(&ecryptfs_msg_ctx_lists_mux);
405 mutex_lock(&ecryptfs_msg_ctx_lists_mux);
406 ecryptfs_msg_counter = 0;
407 for (i = 0; i < ecryptfs_message_buf_len; i++) {
408 INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].node);
Michael Halcrowf66e8832008-04-29 00:59:51 -0700409 INIT_LIST_HEAD(&ecryptfs_msg_ctx_arr[i].daemon_out_list);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800410 mutex_init(&ecryptfs_msg_ctx_arr[i].mux);
411 mutex_lock(&ecryptfs_msg_ctx_arr[i].mux);
412 ecryptfs_msg_ctx_arr[i].index = i;
413 ecryptfs_msg_ctx_arr[i].state = ECRYPTFS_MSG_CTX_STATE_FREE;
414 ecryptfs_msg_ctx_arr[i].counter = 0;
415 ecryptfs_msg_ctx_arr[i].task = NULL;
416 ecryptfs_msg_ctx_arr[i].msg = NULL;
417 list_add_tail(&ecryptfs_msg_ctx_arr[i].node,
418 &ecryptfs_msg_ctx_free_list);
419 mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
420 }
421 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
Tyler Hicks624ae522008-10-15 22:02:51 -0700422 rc = ecryptfs_init_ecryptfs_miscdev();
423 if (rc)
424 ecryptfs_release_messaging();
Michael Halcrow88b4a072007-02-12 00:53:43 -0800425out:
426 return rc;
427}
428
Tyler Hicks624ae522008-10-15 22:02:51 -0700429void ecryptfs_release_messaging(void)
Michael Halcrow88b4a072007-02-12 00:53:43 -0800430{
431 if (ecryptfs_msg_ctx_arr) {
432 int i;
433
434 mutex_lock(&ecryptfs_msg_ctx_lists_mux);
435 for (i = 0; i < ecryptfs_message_buf_len; i++) {
436 mutex_lock(&ecryptfs_msg_ctx_arr[i].mux);
437 if (ecryptfs_msg_ctx_arr[i].msg)
438 kfree(ecryptfs_msg_ctx_arr[i].msg);
439 mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
440 }
441 kfree(ecryptfs_msg_ctx_arr);
442 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
443 }
Michael Halcrowf66e8832008-04-29 00:59:51 -0700444 if (ecryptfs_daemon_hash) {
Michael Halcrowf66e8832008-04-29 00:59:51 -0700445 struct ecryptfs_daemon *daemon;
Michael Halcrow88b4a072007-02-12 00:53:43 -0800446 int i;
447
Michael Halcrowf66e8832008-04-29 00:59:51 -0700448 mutex_lock(&ecryptfs_daemon_hash_mux);
Andre Osterhuesa6f80fb2010-07-13 15:59:17 -0500449 for (i = 0; i < (1 << ecryptfs_hash_bits); i++) {
Michael Halcrowf66e8832008-04-29 00:59:51 -0700450 int rc;
451
Sasha Levinb67bfe02013-02-27 17:06:00 -0800452 hlist_for_each_entry(daemon,
Michael Halcrowf66e8832008-04-29 00:59:51 -0700453 &ecryptfs_daemon_hash[i],
454 euid_chain) {
455 rc = ecryptfs_exorcise_daemon(daemon);
456 if (rc)
457 printk(KERN_ERR "%s: Error whilst "
458 "attempting to destroy daemon; "
459 "rc = [%d]. Dazed and confused, "
460 "but trying to continue.\n",
461 __func__, rc);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800462 }
463 }
Michael Halcrowf66e8832008-04-29 00:59:51 -0700464 kfree(ecryptfs_daemon_hash);
465 mutex_unlock(&ecryptfs_daemon_hash_mux);
Michael Halcrow88b4a072007-02-12 00:53:43 -0800466 }
Tyler Hicks624ae522008-10-15 22:02:51 -0700467 ecryptfs_destroy_ecryptfs_miscdev();
Michael Halcrow88b4a072007-02-12 00:53:43 -0800468 return;
469}