blob: 68954937a071abd9ce4a67b6614880a4073d1554 [file] [log] [blame]
Michael Halcrow237fead2006-10-04 02:16:22 -07001/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2003 Erez Zadok
5 * Copyright (C) 2001-2003 Stony Brook University
Michael Halcrowdd2a3b72007-02-12 00:53:46 -08006 * Copyright (C) 2004-2007 International Business Machines Corp.
Michael Halcrow237fead2006-10-04 02:16:22 -07007 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 * Michael C. Thompson <mcthomps@us.ibm.com>
Michael Halcrowdddfa462007-02-12 00:53:44 -08009 * Tyler Hicks <tyhicks@ou.edu>
Michael Halcrow237fead2006-10-04 02:16:22 -070010 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of the
14 * License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
24 * 02111-1307, USA.
25 */
26
27#include <linux/dcache.h>
28#include <linux/file.h>
29#include <linux/module.h>
30#include <linux/namei.h>
31#include <linux/skbuff.h>
32#include <linux/crypto.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070033#include <linux/mount.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070034#include <linux/pagemap.h>
35#include <linux/key.h>
36#include <linux/parser.h>
Josef "Jeff" Sipek0cc72dc2006-12-08 02:36:31 -080037#include <linux/fs_stack.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Roberto Sassu070baa52010-11-03 11:11:22 +010039#include <linux/magic.h>
Michael Halcrow237fead2006-10-04 02:16:22 -070040#include "ecryptfs_kernel.h"
41
42/**
43 * Module parameter that defines the ecryptfs_verbosity level.
44 */
45int ecryptfs_verbosity = 0;
46
47module_param(ecryptfs_verbosity, int, 0);
48MODULE_PARM_DESC(ecryptfs_verbosity,
49 "Initial verbosity level (0 or 1; defaults to "
50 "0, which is Quiet)");
51
Michael Halcrowdddfa462007-02-12 00:53:44 -080052/**
Tyler Hicks624ae522008-10-15 22:02:51 -070053 * Module parameter that defines the number of message buffer elements
Michael Halcrowdddfa462007-02-12 00:53:44 -080054 */
55unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
56
57module_param(ecryptfs_message_buf_len, uint, 0);
58MODULE_PARM_DESC(ecryptfs_message_buf_len,
59 "Number of message buffer elements");
60
61/**
62 * Module parameter that defines the maximum guaranteed amount of time to wait
Tyler Hicks624ae522008-10-15 22:02:51 -070063 * for a response from ecryptfsd. The actual sleep time will be, more than
Michael Halcrowdddfa462007-02-12 00:53:44 -080064 * likely, a small amount greater than this specified value, but only less if
Tyler Hicks624ae522008-10-15 22:02:51 -070065 * the message successfully arrives.
Michael Halcrowdddfa462007-02-12 00:53:44 -080066 */
67signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
68
69module_param(ecryptfs_message_wait_timeout, long, 0);
70MODULE_PARM_DESC(ecryptfs_message_wait_timeout,
71 "Maximum number of seconds that an operation will "
72 "sleep while waiting for a message response from "
73 "userspace");
74
75/**
76 * Module parameter that is an estimate of the maximum number of users
77 * that will be concurrently using eCryptfs. Set this to the right
78 * value to balance performance and memory use.
79 */
80unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS;
81
82module_param(ecryptfs_number_of_users, uint, 0);
83MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
84 "concurrent users of eCryptfs");
85
Michael Halcrow237fead2006-10-04 02:16:22 -070086void __ecryptfs_printk(const char *fmt, ...)
87{
88 va_list args;
89 va_start(args, fmt);
90 if (fmt[1] == '7') { /* KERN_DEBUG */
91 if (ecryptfs_verbosity >= 1)
92 vprintk(fmt, args);
93 } else
94 vprintk(fmt, args);
95 va_end(args);
96}
97
98/**
Tyler Hicks332ab162011-04-14 15:35:11 -050099 * ecryptfs_init_lower_file
Michael Halcrow4981e082007-10-16 01:28:09 -0700100 * @ecryptfs_dentry: Fully initialized eCryptfs dentry object, with
101 * the lower dentry and the lower mount set
102 *
103 * eCryptfs only ever keeps a single open file for every lower
104 * inode. All I/O operations to the lower inode occur through that
105 * file. When the first eCryptfs dentry that interposes with the first
106 * lower dentry for that inode is created, this function creates the
Tyler Hicks332ab162011-04-14 15:35:11 -0500107 * lower file struct and associates it with the eCryptfs
108 * inode. When all eCryptfs files associated with the inode are released, the
109 * file is closed.
Michael Halcrow4981e082007-10-16 01:28:09 -0700110 *
Tyler Hicks332ab162011-04-14 15:35:11 -0500111 * The lower file will be opened with read/write permissions, if
Michael Halcrow4981e082007-10-16 01:28:09 -0700112 * possible. Otherwise, it is opened read-only.
113 *
Tyler Hicks332ab162011-04-14 15:35:11 -0500114 * This function does nothing if a lower file is already
Michael Halcrow4981e082007-10-16 01:28:09 -0700115 * associated with the eCryptfs inode.
116 *
117 * Returns zero on success; non-zero otherwise
118 */
Tyler Hicks332ab162011-04-14 15:35:11 -0500119static int ecryptfs_init_lower_file(struct dentry *dentry,
120 struct file **lower_file)
Michael Halcrow4981e082007-10-16 01:28:09 -0700121{
David Howells745ca242008-11-14 10:39:22 +1100122 const struct cred *cred = current_cred();
Tyler Hicks332ab162011-04-14 15:35:11 -0500123 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
124 struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
125 int rc;
Michael Halcrow4981e082007-10-16 01:28:09 -0700126
Tyler Hicks332ab162011-04-14 15:35:11 -0500127 rc = ecryptfs_privileged_open(lower_file, lower_dentry, lower_mnt,
128 cred);
129 if (rc) {
130 printk(KERN_ERR "Error opening lower file "
131 "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
132 "rc = [%d]\n", lower_dentry, lower_mnt, rc);
133 (*lower_file) = NULL;
Michael Halcrow4981e082007-10-16 01:28:09 -0700134 }
Michael Halcrow4981e082007-10-16 01:28:09 -0700135 return rc;
136}
137
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500138int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
Tyler Hicks332ab162011-04-14 15:35:11 -0500139{
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500140 struct ecryptfs_inode_info *inode_info;
Tyler Hicks332ab162011-04-14 15:35:11 -0500141 int count, rc = 0;
142
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500143 inode_info = ecryptfs_inode_to_private(inode);
Tyler Hicks332ab162011-04-14 15:35:11 -0500144 mutex_lock(&inode_info->lower_file_mutex);
145 count = atomic_inc_return(&inode_info->lower_file_count);
146 if (WARN_ON_ONCE(count < 1))
147 rc = -EINVAL;
148 else if (count == 1) {
149 rc = ecryptfs_init_lower_file(dentry,
150 &inode_info->lower_file);
151 if (rc)
152 atomic_set(&inode_info->lower_file_count, 0);
153 }
154 mutex_unlock(&inode_info->lower_file_mutex);
155 return rc;
156}
157
158void ecryptfs_put_lower_file(struct inode *inode)
159{
160 struct ecryptfs_inode_info *inode_info;
161
162 inode_info = ecryptfs_inode_to_private(inode);
163 if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count,
164 &inode_info->lower_file_mutex)) {
165 fput(inode_info->lower_file);
166 inode_info->lower_file = NULL;
167 mutex_unlock(&inode_info->lower_file_mutex);
168 }
169}
170
Eric Sandeen2830bfd2008-02-06 01:38:34 -0800171enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
172 ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
173 ecryptfs_opt_ecryptfs_key_bytes,
Michael Halcrow17398952007-02-12 00:53:45 -0800174 ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
Michael Halcrow87c94c42009-01-06 14:42:01 -0800175 ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
176 ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
Roberto Sassuf16feb52010-10-06 18:31:32 +0200177 ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
John Johansen76435542011-07-22 08:14:15 -0700178 ecryptfs_opt_check_dev_ruid,
Roberto Sassuf16feb52010-10-06 18:31:32 +0200179 ecryptfs_opt_err };
Michael Halcrow237fead2006-10-04 02:16:22 -0700180
Steven Whitehousea447c092008-10-13 10:46:57 +0100181static const match_table_t tokens = {
Michael Halcrow237fead2006-10-04 02:16:22 -0700182 {ecryptfs_opt_sig, "sig=%s"},
183 {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
Michael Halcrow237fead2006-10-04 02:16:22 -0700184 {ecryptfs_opt_cipher, "cipher=%s"},
185 {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
186 {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
187 {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
Michael Halcrow17398952007-02-12 00:53:45 -0800188 {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
189 {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
Michael Halcrow87c94c42009-01-06 14:42:01 -0800190 {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
191 {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
192 {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
Tyler Hickse77cc8d2009-04-22 04:08:46 -0500193 {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
Roberto Sassuf16feb52010-10-06 18:31:32 +0200194 {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
John Johansen76435542011-07-22 08:14:15 -0700195 {ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"},
Michael Halcrow237fead2006-10-04 02:16:22 -0700196 {ecryptfs_opt_err, NULL}
197};
198
Michael Halcrowf4aad162007-10-16 01:27:53 -0700199static int ecryptfs_init_global_auth_toks(
200 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
Michael Halcrow237fead2006-10-04 02:16:22 -0700201{
Michael Halcrowf4aad162007-10-16 01:27:53 -0700202 struct ecryptfs_global_auth_tok *global_auth_tok;
Roberto Sassu0e1fc5e2011-03-21 16:00:53 +0100203 struct ecryptfs_auth_tok *auth_tok;
Michael Halcrow237fead2006-10-04 02:16:22 -0700204 int rc = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700205
Michael Halcrowf4aad162007-10-16 01:27:53 -0700206 list_for_each_entry(global_auth_tok,
207 &mount_crypt_stat->global_auth_tok_list,
208 mount_crypt_stat_list) {
Michael Halcrow5dda6992007-10-16 01:28:06 -0700209 rc = ecryptfs_keyring_auth_tok_for_sig(
Roberto Sassu0e1fc5e2011-03-21 16:00:53 +0100210 &global_auth_tok->global_auth_tok_key, &auth_tok,
Michael Halcrow5dda6992007-10-16 01:28:06 -0700211 global_auth_tok->sig);
212 if (rc) {
Michael Halcrowf4aad162007-10-16 01:27:53 -0700213 printk(KERN_ERR "Could not find valid key in user "
214 "session keyring for sig specified in mount "
215 "option: [%s]\n", global_auth_tok->sig);
216 global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
Eric Sandeen982363c2008-07-23 21:30:04 -0700217 goto out;
Roberto Sassub5695d02011-03-21 16:00:55 +0100218 } else {
Michael Halcrowf4aad162007-10-16 01:27:53 -0700219 global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
Roberto Sassub5695d02011-03-21 16:00:55 +0100220 up_write(&(global_auth_tok->global_auth_tok_key)->sem);
221 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700222 }
Eric Sandeen982363c2008-07-23 21:30:04 -0700223out:
Michael Halcrow237fead2006-10-04 02:16:22 -0700224 return rc;
225}
226
Michael Halcrowf4aad162007-10-16 01:27:53 -0700227static void ecryptfs_init_mount_crypt_stat(
228 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
229{
230 memset((void *)mount_crypt_stat, 0,
231 sizeof(struct ecryptfs_mount_crypt_stat));
232 INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
233 mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
234 mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
235}
236
Michael Halcrow237fead2006-10-04 02:16:22 -0700237/**
238 * ecryptfs_parse_options
239 * @sb: The ecryptfs super block
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300240 * @options: The options passed to the kernel
John Johansen76435542011-07-22 08:14:15 -0700241 * @check_ruid: set to 1 if device uid should be checked against the ruid
Michael Halcrow237fead2006-10-04 02:16:22 -0700242 *
243 * Parse mount options:
244 * debug=N - ecryptfs_verbosity level for debug output
245 * sig=XXX - description(signature) of the key to use
246 *
247 * Returns the dentry object of the lower-level (lower/interposed)
248 * directory; We want to mount our stackable file system on top of
249 * that lower directory.
250 *
251 * The signature of the key to use must be the description of a key
252 * already in the keyring. Mounting will fail if the key can not be
253 * found.
254 *
255 * Returns zero on success; non-zero on error
256 */
John Johansen76435542011-07-22 08:14:15 -0700257static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
258 uid_t *check_ruid)
Michael Halcrow237fead2006-10-04 02:16:22 -0700259{
260 char *p;
261 int rc = 0;
262 int sig_set = 0;
263 int cipher_name_set = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800264 int fn_cipher_name_set = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700265 int cipher_key_bytes;
266 int cipher_key_bytes_set = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800267 int fn_cipher_key_bytes;
268 int fn_cipher_key_bytes_set = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700269 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
Al Viro2ccde7c2010-03-21 12:24:29 -0400270 &sbi->mount_crypt_stat;
Michael Halcrow237fead2006-10-04 02:16:22 -0700271 substring_t args[MAX_OPT_ARGS];
272 int token;
273 char *sig_src;
Michael Halcrow237fead2006-10-04 02:16:22 -0700274 char *cipher_name_dst;
275 char *cipher_name_src;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800276 char *fn_cipher_name_dst;
277 char *fn_cipher_name_src;
278 char *fnek_dst;
279 char *fnek_src;
Michael Halcrow237fead2006-10-04 02:16:22 -0700280 char *cipher_key_bytes_src;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800281 char *fn_cipher_key_bytes_src;
Michael Halcrow237fead2006-10-04 02:16:22 -0700282
John Johansen76435542011-07-22 08:14:15 -0700283 *check_ruid = 0;
284
Michael Halcrow237fead2006-10-04 02:16:22 -0700285 if (!options) {
286 rc = -EINVAL;
287 goto out;
288 }
Michael Halcrow956159c2007-10-16 01:27:55 -0700289 ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
Michael Halcrow237fead2006-10-04 02:16:22 -0700290 while ((p = strsep(&options, ",")) != NULL) {
291 if (!*p)
292 continue;
293 token = match_token(p, tokens, args);
294 switch (token) {
295 case ecryptfs_opt_sig:
296 case ecryptfs_opt_ecryptfs_sig:
297 sig_src = args[0].from;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700298 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700299 sig_src, 0);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700300 if (rc) {
301 printk(KERN_ERR "Error attempting to register "
302 "global sig; rc = [%d]\n", rc);
303 goto out;
304 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700305 sig_set = 1;
306 break;
Michael Halcrow237fead2006-10-04 02:16:22 -0700307 case ecryptfs_opt_cipher:
308 case ecryptfs_opt_ecryptfs_cipher:
309 cipher_name_src = args[0].from;
310 cipher_name_dst =
311 mount_crypt_stat->
312 global_default_cipher_name;
313 strncpy(cipher_name_dst, cipher_name_src,
314 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800315 cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
Michael Halcrow237fead2006-10-04 02:16:22 -0700316 cipher_name_set = 1;
317 break;
318 case ecryptfs_opt_ecryptfs_key_bytes:
319 cipher_key_bytes_src = args[0].from;
320 cipher_key_bytes =
321 (int)simple_strtol(cipher_key_bytes_src,
322 &cipher_key_bytes_src, 0);
323 mount_crypt_stat->global_default_cipher_key_size =
324 cipher_key_bytes;
Michael Halcrow237fead2006-10-04 02:16:22 -0700325 cipher_key_bytes_set = 1;
326 break;
327 case ecryptfs_opt_passthrough:
328 mount_crypt_stat->flags |=
329 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
330 break;
Michael Halcrow17398952007-02-12 00:53:45 -0800331 case ecryptfs_opt_xattr_metadata:
332 mount_crypt_stat->flags |=
333 ECRYPTFS_XATTR_METADATA_ENABLED;
334 break;
335 case ecryptfs_opt_encrypted_view:
336 mount_crypt_stat->flags |=
337 ECRYPTFS_XATTR_METADATA_ENABLED;
338 mount_crypt_stat->flags |=
339 ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
340 break;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800341 case ecryptfs_opt_fnek_sig:
342 fnek_src = args[0].from;
343 fnek_dst =
344 mount_crypt_stat->global_default_fnek_sig;
345 strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
346 mount_crypt_stat->global_default_fnek_sig[
347 ECRYPTFS_SIG_SIZE_HEX] = '\0';
348 rc = ecryptfs_add_global_auth_tok(
349 mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700350 mount_crypt_stat->global_default_fnek_sig,
351 ECRYPTFS_AUTH_TOK_FNEK);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800352 if (rc) {
353 printk(KERN_ERR "Error attempting to register "
354 "global fnek sig [%s]; rc = [%d]\n",
355 mount_crypt_stat->global_default_fnek_sig,
356 rc);
357 goto out;
358 }
359 mount_crypt_stat->flags |=
360 (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
361 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
362 break;
363 case ecryptfs_opt_fn_cipher:
364 fn_cipher_name_src = args[0].from;
365 fn_cipher_name_dst =
366 mount_crypt_stat->global_default_fn_cipher_name;
367 strncpy(fn_cipher_name_dst, fn_cipher_name_src,
368 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
369 mount_crypt_stat->global_default_fn_cipher_name[
370 ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
371 fn_cipher_name_set = 1;
372 break;
373 case ecryptfs_opt_fn_cipher_key_bytes:
374 fn_cipher_key_bytes_src = args[0].from;
375 fn_cipher_key_bytes =
376 (int)simple_strtol(fn_cipher_key_bytes_src,
377 &fn_cipher_key_bytes_src, 0);
378 mount_crypt_stat->global_default_fn_cipher_key_bytes =
379 fn_cipher_key_bytes;
380 fn_cipher_key_bytes_set = 1;
381 break;
Tyler Hickse77cc8d2009-04-22 04:08:46 -0500382 case ecryptfs_opt_unlink_sigs:
383 mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
384 break;
Roberto Sassuf16feb52010-10-06 18:31:32 +0200385 case ecryptfs_opt_mount_auth_tok_only:
386 mount_crypt_stat->flags |=
387 ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
388 break;
John Johansen76435542011-07-22 08:14:15 -0700389 case ecryptfs_opt_check_dev_ruid:
390 *check_ruid = 1;
391 break;
Michael Halcrow237fead2006-10-04 02:16:22 -0700392 case ecryptfs_opt_err:
393 default:
Michael Halcrow87c94c42009-01-06 14:42:01 -0800394 printk(KERN_WARNING
395 "%s: eCryptfs: unrecognized option [%s]\n",
396 __func__, p);
Michael Halcrow237fead2006-10-04 02:16:22 -0700397 }
398 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700399 if (!sig_set) {
400 rc = -EINVAL;
Michael Halcrow956159c2007-10-16 01:27:55 -0700401 ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
402 "auth tok signature as a mount "
Michael Halcrow237fead2006-10-04 02:16:22 -0700403 "parameter; see the eCryptfs README\n");
404 goto out;
405 }
406 if (!cipher_name_set) {
Miklos Szeredi8f236802008-07-23 21:30:05 -0700407 int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
408
409 BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
Miklos Szeredi8f236802008-07-23 21:30:05 -0700410 strcpy(mount_crypt_stat->global_default_cipher_name,
411 ECRYPTFS_DEFAULT_CIPHER);
Michael Halcrow237fead2006-10-04 02:16:22 -0700412 }
Michael Halcrow87c94c42009-01-06 14:42:01 -0800413 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
414 && !fn_cipher_name_set)
415 strcpy(mount_crypt_stat->global_default_fn_cipher_name,
416 mount_crypt_stat->global_default_cipher_name);
417 if (!cipher_key_bytes_set)
Michael Halcrowe5d9cbd2006-10-30 22:07:16 -0800418 mount_crypt_stat->global_default_cipher_key_size = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800419 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
420 && !fn_cipher_key_bytes_set)
421 mount_crypt_stat->global_default_fn_cipher_key_bytes =
422 mount_crypt_stat->global_default_cipher_key_size;
Eric Sandeenaf440f52008-02-06 01:38:37 -0800423 mutex_lock(&key_tfm_list_mutex);
424 if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
Michael Halcrow87c94c42009-01-06 14:42:01 -0800425 NULL)) {
Eric Sandeenaf440f52008-02-06 01:38:37 -0800426 rc = ecryptfs_add_new_key_tfm(
427 NULL, mount_crypt_stat->global_default_cipher_name,
428 mount_crypt_stat->global_default_cipher_key_size);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800429 if (rc) {
430 printk(KERN_ERR "Error attempting to initialize "
431 "cipher with name = [%s] and key size = [%td]; "
432 "rc = [%d]\n",
433 mount_crypt_stat->global_default_cipher_name,
434 mount_crypt_stat->global_default_cipher_key_size,
435 rc);
436 rc = -EINVAL;
437 mutex_unlock(&key_tfm_list_mutex);
438 goto out;
439 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700440 }
Michael Halcrow87c94c42009-01-06 14:42:01 -0800441 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
442 && !ecryptfs_tfm_exists(
443 mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
444 rc = ecryptfs_add_new_key_tfm(
445 NULL, mount_crypt_stat->global_default_fn_cipher_name,
446 mount_crypt_stat->global_default_fn_cipher_key_bytes);
447 if (rc) {
448 printk(KERN_ERR "Error attempting to initialize "
449 "cipher with name = [%s] and key size = [%td]; "
450 "rc = [%d]\n",
451 mount_crypt_stat->global_default_fn_cipher_name,
452 mount_crypt_stat->global_default_fn_cipher_key_bytes,
453 rc);
454 rc = -EINVAL;
455 mutex_unlock(&key_tfm_list_mutex);
456 goto out;
457 }
458 }
459 mutex_unlock(&key_tfm_list_mutex);
Michael Halcrow5dda6992007-10-16 01:28:06 -0700460 rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800461 if (rc)
Michael Halcrowf4aad162007-10-16 01:27:53 -0700462 printk(KERN_WARNING "One or more global auth toks could not "
463 "properly register; rc = [%d]\n", rc);
Michael Halcrow237fead2006-10-04 02:16:22 -0700464out:
465 return rc;
466}
467
468struct kmem_cache *ecryptfs_sb_info_cache;
Al Viro44031582010-05-17 00:59:46 -0400469static struct file_system_type ecryptfs_fs_type;
Michael Halcrow237fead2006-10-04 02:16:22 -0700470
471/**
Michael Halcrow237fead2006-10-04 02:16:22 -0700472 * ecryptfs_get_sb
473 * @fs_type
474 * @flags
475 * @dev_name: The path to mount over
476 * @raw_data: The options passed into the kernel
Michael Halcrow237fead2006-10-04 02:16:22 -0700477 */
Al Viro4d143be2010-07-26 13:33:36 +0400478static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
479 const char *dev_name, void *raw_data)
Michael Halcrow237fead2006-10-04 02:16:22 -0700480{
Al Viro2ccde7c2010-03-21 12:24:29 -0400481 struct super_block *s;
482 struct ecryptfs_sb_info *sbi;
483 struct ecryptfs_dentry_info *root_info;
484 const char *err = "Getting sb failed";
Al Viro66cb7662011-01-12 20:04:37 -0500485 struct inode *inode;
486 struct path path;
John Johansen76435542011-07-22 08:14:15 -0700487 uid_t check_ruid;
Michael Halcrow237fead2006-10-04 02:16:22 -0700488 int rc;
Michael Halcrow237fead2006-10-04 02:16:22 -0700489
Al Viro2ccde7c2010-03-21 12:24:29 -0400490 sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
491 if (!sbi) {
492 rc = -ENOMEM;
Michael Halcrow237fead2006-10-04 02:16:22 -0700493 goto out;
494 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400495
John Johansen76435542011-07-22 08:14:15 -0700496 rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid);
Michael Halcrow237fead2006-10-04 02:16:22 -0700497 if (rc) {
Al Viro2ccde7c2010-03-21 12:24:29 -0400498 err = "Error parsing options";
499 goto out;
Michael Halcrow237fead2006-10-04 02:16:22 -0700500 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400501
502 s = sget(fs_type, NULL, set_anon_super, NULL);
503 if (IS_ERR(s)) {
504 rc = PTR_ERR(s);
505 goto out;
506 }
507
508 s->s_flags = flags;
509 rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
Al Viro66cb7662011-01-12 20:04:37 -0500510 if (rc)
511 goto out1;
Al Viro2ccde7c2010-03-21 12:24:29 -0400512
513 ecryptfs_set_superblock_private(s, sbi);
514 s->s_bdi = &sbi->bdi;
515
516 /* ->kill_sb() will take care of sbi after that point */
517 sbi = NULL;
518 s->s_op = &ecryptfs_sops;
Al Viro66cb7662011-01-12 20:04:37 -0500519 s->s_d_op = &ecryptfs_dops;
520
521 err = "Reading sb failed";
522 rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
523 if (rc) {
524 ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
525 goto out1;
526 }
527 if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
528 rc = -EINVAL;
529 printk(KERN_ERR "Mount on filesystem of type "
530 "eCryptfs explicitly disallowed due to "
531 "known incompatibilities\n");
532 goto out_free;
533 }
John Johansen76435542011-07-22 08:14:15 -0700534
535 if (check_ruid && path.dentry->d_inode->i_uid != current_uid()) {
536 rc = -EPERM;
537 printk(KERN_ERR "Mount of device (uid: %d) not owned by "
538 "requested user (uid: %d)\n",
539 path.dentry->d_inode->i_uid, current_uid());
540 goto out_free;
541 }
542
Al Viro66cb7662011-01-12 20:04:37 -0500543 ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
544 s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
545 s->s_blocksize = path.dentry->d_sb->s_blocksize;
Roberto Sassu070baa52010-11-03 11:11:22 +0100546 s->s_magic = ECRYPTFS_SUPER_MAGIC;
Al Viro66cb7662011-01-12 20:04:37 -0500547
548 inode = ecryptfs_get_inode(path.dentry->d_inode, s);
549 rc = PTR_ERR(inode);
550 if (IS_ERR(inode))
551 goto out_free;
552
Al Viro48fde702012-01-08 22:15:13 -0500553 s->s_root = d_make_root(inode);
Al Viro66cb7662011-01-12 20:04:37 -0500554 if (!s->s_root) {
Al Viro66cb7662011-01-12 20:04:37 -0500555 rc = -ENOMEM;
556 goto out_free;
557 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400558
559 rc = -ENOMEM;
Al Viro2ccde7c2010-03-21 12:24:29 -0400560 root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
Al Viro66cb7662011-01-12 20:04:37 -0500561 if (!root_info)
562 goto out_free;
563
Al Viro2ccde7c2010-03-21 12:24:29 -0400564 /* ->kill_sb() will take care of root_info */
565 ecryptfs_set_dentry_private(s->s_root, root_info);
Al Viro66cb7662011-01-12 20:04:37 -0500566 ecryptfs_set_dentry_lower(s->s_root, path.dentry);
567 ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt);
568
Al Viro2ccde7c2010-03-21 12:24:29 -0400569 s->s_flags |= MS_ACTIVE;
Al Viro4d143be2010-07-26 13:33:36 +0400570 return dget(s->s_root);
Al Viro2ccde7c2010-03-21 12:24:29 -0400571
Al Viro66cb7662011-01-12 20:04:37 -0500572out_free:
573 path_put(&path);
574out1:
575 deactivate_locked_super(s);
Michael Halcrow237fead2006-10-04 02:16:22 -0700576out:
Al Viro2ccde7c2010-03-21 12:24:29 -0400577 if (sbi) {
578 ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
579 kmem_cache_free(ecryptfs_sb_info_cache, sbi);
580 }
581 printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
Al Viro4d143be2010-07-26 13:33:36 +0400582 return ERR_PTR(rc);
Michael Halcrow237fead2006-10-04 02:16:22 -0700583}
584
585/**
586 * ecryptfs_kill_block_super
587 * @sb: The ecryptfs super block
588 *
589 * Used to bring the superblock down and free the private data.
Michael Halcrow237fead2006-10-04 02:16:22 -0700590 */
591static void ecryptfs_kill_block_super(struct super_block *sb)
592{
Al Virodecabd62010-03-20 22:32:26 -0400593 struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
594 kill_anon_super(sb);
595 if (!sb_info)
596 return;
597 ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
598 bdi_destroy(&sb_info->bdi);
599 kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
Michael Halcrow237fead2006-10-04 02:16:22 -0700600}
601
602static struct file_system_type ecryptfs_fs_type = {
603 .owner = THIS_MODULE,
604 .name = "ecryptfs",
Al Viro4d143be2010-07-26 13:33:36 +0400605 .mount = ecryptfs_mount,
Michael Halcrow237fead2006-10-04 02:16:22 -0700606 .kill_sb = ecryptfs_kill_block_super,
607 .fs_flags = 0
608};
609
610/**
611 * inode_info_init_once
612 *
613 * Initializes the ecryptfs_inode_info_cache when it is created
614 */
615static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700616inode_info_init_once(void *vptr)
Michael Halcrow237fead2006-10-04 02:16:22 -0700617{
618 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
619
Christoph Lametera35afb82007-05-16 22:10:57 -0700620 inode_init_once(&ei->vfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700621}
622
623static struct ecryptfs_cache_info {
Christoph Lametere18b8902006-12-06 20:33:20 -0800624 struct kmem_cache **cache;
Michael Halcrow237fead2006-10-04 02:16:22 -0700625 const char *name;
626 size_t size;
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700627 void (*ctor)(void *obj);
Michael Halcrow237fead2006-10-04 02:16:22 -0700628} ecryptfs_cache_infos[] = {
629 {
630 .cache = &ecryptfs_auth_tok_list_item_cache,
631 .name = "ecryptfs_auth_tok_list_item",
632 .size = sizeof(struct ecryptfs_auth_tok_list_item),
633 },
634 {
635 .cache = &ecryptfs_file_info_cache,
636 .name = "ecryptfs_file_cache",
637 .size = sizeof(struct ecryptfs_file_info),
638 },
639 {
640 .cache = &ecryptfs_dentry_info_cache,
641 .name = "ecryptfs_dentry_info_cache",
642 .size = sizeof(struct ecryptfs_dentry_info),
643 },
644 {
645 .cache = &ecryptfs_inode_info_cache,
646 .name = "ecryptfs_inode_cache",
647 .size = sizeof(struct ecryptfs_inode_info),
648 .ctor = inode_info_init_once,
649 },
650 {
651 .cache = &ecryptfs_sb_info_cache,
652 .name = "ecryptfs_sb_cache",
653 .size = sizeof(struct ecryptfs_sb_info),
654 },
655 {
Tyler Hicks30632872011-05-24 05:11:12 -0500656 .cache = &ecryptfs_header_cache,
657 .name = "ecryptfs_headers",
Michael Halcrow237fead2006-10-04 02:16:22 -0700658 .size = PAGE_CACHE_SIZE,
659 },
660 {
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800661 .cache = &ecryptfs_xattr_cache,
662 .name = "ecryptfs_xattr_cache",
663 .size = PAGE_CACHE_SIZE,
664 },
665 {
Michael Halcroweb95e7f2007-02-16 01:28:40 -0800666 .cache = &ecryptfs_key_record_cache,
667 .name = "ecryptfs_key_record_cache",
668 .size = sizeof(struct ecryptfs_key_record),
669 },
Michael Halcrow956159c2007-10-16 01:27:55 -0700670 {
671 .cache = &ecryptfs_key_sig_cache,
672 .name = "ecryptfs_key_sig_cache",
673 .size = sizeof(struct ecryptfs_key_sig),
674 },
675 {
676 .cache = &ecryptfs_global_auth_tok_cache,
677 .name = "ecryptfs_global_auth_tok_cache",
678 .size = sizeof(struct ecryptfs_global_auth_tok),
679 },
680 {
681 .cache = &ecryptfs_key_tfm_cache,
682 .name = "ecryptfs_key_tfm_cache",
683 .size = sizeof(struct ecryptfs_key_tfm),
684 },
Michael Halcrow746f1e52008-07-23 21:30:02 -0700685 {
686 .cache = &ecryptfs_open_req_cache,
687 .name = "ecryptfs_open_req_cache",
688 .size = sizeof(struct ecryptfs_open_req),
689 },
Michael Halcrow237fead2006-10-04 02:16:22 -0700690};
691
692static void ecryptfs_free_kmem_caches(void)
693{
694 int i;
695
696 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
697 struct ecryptfs_cache_info *info;
698
699 info = &ecryptfs_cache_infos[i];
700 if (*(info->cache))
701 kmem_cache_destroy(*(info->cache));
702 }
703}
704
705/**
706 * ecryptfs_init_kmem_caches
707 *
708 * Returns zero on success; non-zero otherwise
709 */
710static int ecryptfs_init_kmem_caches(void)
711{
712 int i;
713
714 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
715 struct ecryptfs_cache_info *info;
716
717 info = &ecryptfs_cache_infos[i];
718 *(info->cache) = kmem_cache_create(info->name, info->size,
Paul Mundt20c2df82007-07-20 10:11:58 +0900719 0, SLAB_HWCACHE_ALIGN, info->ctor);
Michael Halcrow237fead2006-10-04 02:16:22 -0700720 if (!*(info->cache)) {
721 ecryptfs_free_kmem_caches();
722 ecryptfs_printk(KERN_WARNING, "%s: "
723 "kmem_cache_create failed\n",
724 info->name);
725 return -ENOMEM;
726 }
727 }
728 return 0;
729}
730
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800731static struct kobject *ecryptfs_kobj;
Michael Halcrow237fead2006-10-04 02:16:22 -0700732
Kay Sievers386f2752007-11-02 13:47:53 +0100733static ssize_t version_show(struct kobject *kobj,
734 struct kobj_attribute *attr, char *buff)
Michael Halcrow237fead2006-10-04 02:16:22 -0700735{
736 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
737}
738
Kay Sievers386f2752007-11-02 13:47:53 +0100739static struct kobj_attribute version_attr = __ATTR_RO(version);
Michael Halcrow237fead2006-10-04 02:16:22 -0700740
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700741static struct attribute *attributes[] = {
742 &version_attr.attr,
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700743 NULL,
744};
745
746static struct attribute_group attr_group = {
747 .attrs = attributes,
748};
Michael Halcrow237fead2006-10-04 02:16:22 -0700749
750static int do_sysfs_registration(void)
751{
752 int rc;
753
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800754 ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
755 if (!ecryptfs_kobj) {
Greg Kroah-Hartman917e8652007-10-29 20:13:17 +0100756 printk(KERN_ERR "Unable to create ecryptfs kset\n");
757 rc = -ENOMEM;
Michael Halcrow237fead2006-10-04 02:16:22 -0700758 goto out;
759 }
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800760 rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
Michael Halcrow237fead2006-10-04 02:16:22 -0700761 if (rc) {
762 printk(KERN_ERR
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700763 "Unable to create ecryptfs version attributes\n");
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800764 kobject_put(ecryptfs_kobj);
Michael Halcrow237fead2006-10-04 02:16:22 -0700765 }
766out:
767 return rc;
768}
769
Ryusuke Konishia75de1b2007-08-10 13:00:56 -0700770static void do_sysfs_unregistration(void)
771{
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800772 sysfs_remove_group(ecryptfs_kobj, &attr_group);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800773 kobject_put(ecryptfs_kobj);
Ryusuke Konishia75de1b2007-08-10 13:00:56 -0700774}
775
Michael Halcrow237fead2006-10-04 02:16:22 -0700776static int __init ecryptfs_init(void)
777{
778 int rc;
779
780 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
781 rc = -EINVAL;
782 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
783 "larger than the host's page size, and so "
784 "eCryptfs cannot run on this system. The "
Joe Perches888d57b2010-11-10 15:46:16 -0800785 "default eCryptfs extent size is [%u] bytes; "
786 "the page size is [%lu] bytes.\n",
787 ECRYPTFS_DEFAULT_EXTENT_SIZE,
788 (unsigned long)PAGE_CACHE_SIZE);
Michael Halcrow237fead2006-10-04 02:16:22 -0700789 goto out;
790 }
791 rc = ecryptfs_init_kmem_caches();
792 if (rc) {
793 printk(KERN_ERR
794 "Failed to allocate one or more kmem_cache objects\n");
795 goto out;
796 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700797 rc = do_sysfs_registration();
798 if (rc) {
799 printk(KERN_ERR "sysfs registration failed\n");
Al Viro0794f562012-03-17 21:29:13 -0400800 goto out_free_kmem_caches;
Michael Halcrow237fead2006-10-04 02:16:22 -0700801 }
Michael Halcrow746f1e52008-07-23 21:30:02 -0700802 rc = ecryptfs_init_kthread();
803 if (rc) {
804 printk(KERN_ERR "%s: kthread initialization failed; "
805 "rc = [%d]\n", __func__, rc);
806 goto out_do_sysfs_unregistration;
807 }
Tyler Hicks624ae522008-10-15 22:02:51 -0700808 rc = ecryptfs_init_messaging();
Michael Halcrowdddfa462007-02-12 00:53:44 -0800809 if (rc) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300810 printk(KERN_ERR "Failure occurred while attempting to "
Tyler Hicks624ae522008-10-15 22:02:51 -0700811 "initialize the communications channel to "
812 "ecryptfsd\n");
Michael Halcrow746f1e52008-07-23 21:30:02 -0700813 goto out_destroy_kthread;
Michael Halcrow956159c2007-10-16 01:27:55 -0700814 }
815 rc = ecryptfs_init_crypto();
816 if (rc) {
817 printk(KERN_ERR "Failure whilst attempting to init crypto; "
818 "rc = [%d]\n", rc);
Michael Halcrowcf81f892007-10-16 01:28:07 -0700819 goto out_release_messaging;
Michael Halcrowdddfa462007-02-12 00:53:44 -0800820 }
Al Viro0794f562012-03-17 21:29:13 -0400821 rc = register_filesystem(&ecryptfs_fs_type);
822 if (rc) {
823 printk(KERN_ERR "Failed to register filesystem\n");
824 goto out_destroy_crypto;
825 }
Eric Sandeen2830bfd2008-02-06 01:38:34 -0800826 if (ecryptfs_verbosity > 0)
827 printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
828 "will be written to the syslog!\n", ecryptfs_verbosity);
829
Michael Halcrowcf81f892007-10-16 01:28:07 -0700830 goto out;
Al Viro0794f562012-03-17 21:29:13 -0400831out_destroy_crypto:
832 ecryptfs_destroy_crypto();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700833out_release_messaging:
Tyler Hicks624ae522008-10-15 22:02:51 -0700834 ecryptfs_release_messaging();
Michael Halcrow746f1e52008-07-23 21:30:02 -0700835out_destroy_kthread:
836 ecryptfs_destroy_kthread();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700837out_do_sysfs_unregistration:
838 do_sysfs_unregistration();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700839out_free_kmem_caches:
840 ecryptfs_free_kmem_caches();
Michael Halcrow237fead2006-10-04 02:16:22 -0700841out:
842 return rc;
843}
844
845static void __exit ecryptfs_exit(void)
846{
Michael Halcrowcf81f892007-10-16 01:28:07 -0700847 int rc;
848
849 rc = ecryptfs_destroy_crypto();
850 if (rc)
851 printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
852 "rc = [%d]\n", rc);
Tyler Hicks624ae522008-10-15 22:02:51 -0700853 ecryptfs_release_messaging();
Michael Halcrow746f1e52008-07-23 21:30:02 -0700854 ecryptfs_destroy_kthread();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700855 do_sysfs_unregistration();
Michael Halcrow237fead2006-10-04 02:16:22 -0700856 unregister_filesystem(&ecryptfs_fs_type);
857 ecryptfs_free_kmem_caches();
858}
859
860MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
861MODULE_DESCRIPTION("eCryptfs");
862
863MODULE_LICENSE("GPL");
864
865module_init(ecryptfs_init)
866module_exit(ecryptfs_exit)