blob: 4e0886c9e5c476059346f5a0d520257418ce03ba [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)) {
Tyler Hicks7149f252012-09-12 18:02:46 -0700165 filemap_write_and_wait(inode->i_mapping);
Tyler Hicks332ab162011-04-14 15:35:11 -0500166 fput(inode_info->lower_file);
167 inode_info->lower_file = NULL;
168 mutex_unlock(&inode_info->lower_file_mutex);
169 }
170}
171
Eric Sandeen2830bfd2008-02-06 01:38:34 -0800172enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
173 ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
174 ecryptfs_opt_ecryptfs_key_bytes,
Michael Halcrow17398952007-02-12 00:53:45 -0800175 ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
Michael Halcrow87c94c42009-01-06 14:42:01 -0800176 ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
177 ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
Roberto Sassuf16feb52010-10-06 18:31:32 +0200178 ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
John Johansen76435542011-07-22 08:14:15 -0700179 ecryptfs_opt_check_dev_ruid,
Roberto Sassuf16feb52010-10-06 18:31:32 +0200180 ecryptfs_opt_err };
Michael Halcrow237fead2006-10-04 02:16:22 -0700181
Steven Whitehousea447c092008-10-13 10:46:57 +0100182static const match_table_t tokens = {
Michael Halcrow237fead2006-10-04 02:16:22 -0700183 {ecryptfs_opt_sig, "sig=%s"},
184 {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
Michael Halcrow237fead2006-10-04 02:16:22 -0700185 {ecryptfs_opt_cipher, "cipher=%s"},
186 {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
187 {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
188 {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
Michael Halcrow17398952007-02-12 00:53:45 -0800189 {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
190 {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
Michael Halcrow87c94c42009-01-06 14:42:01 -0800191 {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
192 {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
193 {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
Tyler Hickse77cc8d2009-04-22 04:08:46 -0500194 {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
Roberto Sassuf16feb52010-10-06 18:31:32 +0200195 {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
John Johansen76435542011-07-22 08:14:15 -0700196 {ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"},
Michael Halcrow237fead2006-10-04 02:16:22 -0700197 {ecryptfs_opt_err, NULL}
198};
199
Michael Halcrowf4aad162007-10-16 01:27:53 -0700200static int ecryptfs_init_global_auth_toks(
201 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
Michael Halcrow237fead2006-10-04 02:16:22 -0700202{
Michael Halcrowf4aad162007-10-16 01:27:53 -0700203 struct ecryptfs_global_auth_tok *global_auth_tok;
Roberto Sassu0e1fc5e2011-03-21 16:00:53 +0100204 struct ecryptfs_auth_tok *auth_tok;
Michael Halcrow237fead2006-10-04 02:16:22 -0700205 int rc = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700206
Michael Halcrowf4aad162007-10-16 01:27:53 -0700207 list_for_each_entry(global_auth_tok,
208 &mount_crypt_stat->global_auth_tok_list,
209 mount_crypt_stat_list) {
Michael Halcrow5dda6992007-10-16 01:28:06 -0700210 rc = ecryptfs_keyring_auth_tok_for_sig(
Roberto Sassu0e1fc5e2011-03-21 16:00:53 +0100211 &global_auth_tok->global_auth_tok_key, &auth_tok,
Michael Halcrow5dda6992007-10-16 01:28:06 -0700212 global_auth_tok->sig);
213 if (rc) {
Michael Halcrowf4aad162007-10-16 01:27:53 -0700214 printk(KERN_ERR "Could not find valid key in user "
215 "session keyring for sig specified in mount "
216 "option: [%s]\n", global_auth_tok->sig);
217 global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
Eric Sandeen982363c2008-07-23 21:30:04 -0700218 goto out;
Roberto Sassub5695d02011-03-21 16:00:55 +0100219 } else {
Michael Halcrowf4aad162007-10-16 01:27:53 -0700220 global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
Roberto Sassub5695d02011-03-21 16:00:55 +0100221 up_write(&(global_auth_tok->global_auth_tok_key)->sem);
222 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700223 }
Eric Sandeen982363c2008-07-23 21:30:04 -0700224out:
Michael Halcrow237fead2006-10-04 02:16:22 -0700225 return rc;
226}
227
Michael Halcrowf4aad162007-10-16 01:27:53 -0700228static void ecryptfs_init_mount_crypt_stat(
229 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
230{
231 memset((void *)mount_crypt_stat, 0,
232 sizeof(struct ecryptfs_mount_crypt_stat));
233 INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
234 mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
235 mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
236}
237
Michael Halcrow237fead2006-10-04 02:16:22 -0700238/**
239 * ecryptfs_parse_options
240 * @sb: The ecryptfs super block
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300241 * @options: The options passed to the kernel
John Johansen76435542011-07-22 08:14:15 -0700242 * @check_ruid: set to 1 if device uid should be checked against the ruid
Michael Halcrow237fead2006-10-04 02:16:22 -0700243 *
244 * Parse mount options:
245 * debug=N - ecryptfs_verbosity level for debug output
246 * sig=XXX - description(signature) of the key to use
247 *
248 * Returns the dentry object of the lower-level (lower/interposed)
249 * directory; We want to mount our stackable file system on top of
250 * that lower directory.
251 *
252 * The signature of the key to use must be the description of a key
253 * already in the keyring. Mounting will fail if the key can not be
254 * found.
255 *
256 * Returns zero on success; non-zero on error
257 */
John Johansen76435542011-07-22 08:14:15 -0700258static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
259 uid_t *check_ruid)
Michael Halcrow237fead2006-10-04 02:16:22 -0700260{
261 char *p;
262 int rc = 0;
263 int sig_set = 0;
264 int cipher_name_set = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800265 int fn_cipher_name_set = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700266 int cipher_key_bytes;
267 int cipher_key_bytes_set = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800268 int fn_cipher_key_bytes;
269 int fn_cipher_key_bytes_set = 0;
Michael Halcrow237fead2006-10-04 02:16:22 -0700270 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
Al Viro2ccde7c2010-03-21 12:24:29 -0400271 &sbi->mount_crypt_stat;
Michael Halcrow237fead2006-10-04 02:16:22 -0700272 substring_t args[MAX_OPT_ARGS];
273 int token;
274 char *sig_src;
Michael Halcrow237fead2006-10-04 02:16:22 -0700275 char *cipher_name_dst;
276 char *cipher_name_src;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800277 char *fn_cipher_name_dst;
278 char *fn_cipher_name_src;
279 char *fnek_dst;
280 char *fnek_src;
Michael Halcrow237fead2006-10-04 02:16:22 -0700281 char *cipher_key_bytes_src;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800282 char *fn_cipher_key_bytes_src;
Tim Sally5f5b3312012-07-12 19:10:24 -0400283 u8 cipher_code;
Michael Halcrow237fead2006-10-04 02:16:22 -0700284
John Johansen76435542011-07-22 08:14:15 -0700285 *check_ruid = 0;
286
Michael Halcrow237fead2006-10-04 02:16:22 -0700287 if (!options) {
288 rc = -EINVAL;
289 goto out;
290 }
Michael Halcrow956159c2007-10-16 01:27:55 -0700291 ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
Michael Halcrow237fead2006-10-04 02:16:22 -0700292 while ((p = strsep(&options, ",")) != NULL) {
293 if (!*p)
294 continue;
295 token = match_token(p, tokens, args);
296 switch (token) {
297 case ecryptfs_opt_sig:
298 case ecryptfs_opt_ecryptfs_sig:
299 sig_src = args[0].from;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700300 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700301 sig_src, 0);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700302 if (rc) {
303 printk(KERN_ERR "Error attempting to register "
304 "global sig; rc = [%d]\n", rc);
305 goto out;
306 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700307 sig_set = 1;
308 break;
Michael Halcrow237fead2006-10-04 02:16:22 -0700309 case ecryptfs_opt_cipher:
310 case ecryptfs_opt_ecryptfs_cipher:
311 cipher_name_src = args[0].from;
312 cipher_name_dst =
313 mount_crypt_stat->
314 global_default_cipher_name;
315 strncpy(cipher_name_dst, cipher_name_src,
316 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800317 cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
Michael Halcrow237fead2006-10-04 02:16:22 -0700318 cipher_name_set = 1;
319 break;
320 case ecryptfs_opt_ecryptfs_key_bytes:
321 cipher_key_bytes_src = args[0].from;
322 cipher_key_bytes =
323 (int)simple_strtol(cipher_key_bytes_src,
324 &cipher_key_bytes_src, 0);
325 mount_crypt_stat->global_default_cipher_key_size =
326 cipher_key_bytes;
Michael Halcrow237fead2006-10-04 02:16:22 -0700327 cipher_key_bytes_set = 1;
328 break;
329 case ecryptfs_opt_passthrough:
330 mount_crypt_stat->flags |=
331 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
332 break;
Michael Halcrow17398952007-02-12 00:53:45 -0800333 case ecryptfs_opt_xattr_metadata:
334 mount_crypt_stat->flags |=
335 ECRYPTFS_XATTR_METADATA_ENABLED;
336 break;
337 case ecryptfs_opt_encrypted_view:
338 mount_crypt_stat->flags |=
339 ECRYPTFS_XATTR_METADATA_ENABLED;
340 mount_crypt_stat->flags |=
341 ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
342 break;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800343 case ecryptfs_opt_fnek_sig:
344 fnek_src = args[0].from;
345 fnek_dst =
346 mount_crypt_stat->global_default_fnek_sig;
347 strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
348 mount_crypt_stat->global_default_fnek_sig[
349 ECRYPTFS_SIG_SIZE_HEX] = '\0';
350 rc = ecryptfs_add_global_auth_tok(
351 mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700352 mount_crypt_stat->global_default_fnek_sig,
353 ECRYPTFS_AUTH_TOK_FNEK);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800354 if (rc) {
355 printk(KERN_ERR "Error attempting to register "
356 "global fnek sig [%s]; rc = [%d]\n",
357 mount_crypt_stat->global_default_fnek_sig,
358 rc);
359 goto out;
360 }
361 mount_crypt_stat->flags |=
362 (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
363 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
364 break;
365 case ecryptfs_opt_fn_cipher:
366 fn_cipher_name_src = args[0].from;
367 fn_cipher_name_dst =
368 mount_crypt_stat->global_default_fn_cipher_name;
369 strncpy(fn_cipher_name_dst, fn_cipher_name_src,
370 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
371 mount_crypt_stat->global_default_fn_cipher_name[
372 ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
373 fn_cipher_name_set = 1;
374 break;
375 case ecryptfs_opt_fn_cipher_key_bytes:
376 fn_cipher_key_bytes_src = args[0].from;
377 fn_cipher_key_bytes =
378 (int)simple_strtol(fn_cipher_key_bytes_src,
379 &fn_cipher_key_bytes_src, 0);
380 mount_crypt_stat->global_default_fn_cipher_key_bytes =
381 fn_cipher_key_bytes;
382 fn_cipher_key_bytes_set = 1;
383 break;
Tyler Hickse77cc8d2009-04-22 04:08:46 -0500384 case ecryptfs_opt_unlink_sigs:
385 mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
386 break;
Roberto Sassuf16feb52010-10-06 18:31:32 +0200387 case ecryptfs_opt_mount_auth_tok_only:
388 mount_crypt_stat->flags |=
389 ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
390 break;
John Johansen76435542011-07-22 08:14:15 -0700391 case ecryptfs_opt_check_dev_ruid:
392 *check_ruid = 1;
393 break;
Michael Halcrow237fead2006-10-04 02:16:22 -0700394 case ecryptfs_opt_err:
395 default:
Michael Halcrow87c94c42009-01-06 14:42:01 -0800396 printk(KERN_WARNING
397 "%s: eCryptfs: unrecognized option [%s]\n",
398 __func__, p);
Michael Halcrow237fead2006-10-04 02:16:22 -0700399 }
400 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700401 if (!sig_set) {
402 rc = -EINVAL;
Michael Halcrow956159c2007-10-16 01:27:55 -0700403 ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
404 "auth tok signature as a mount "
Michael Halcrow237fead2006-10-04 02:16:22 -0700405 "parameter; see the eCryptfs README\n");
406 goto out;
407 }
408 if (!cipher_name_set) {
Miklos Szeredi8f236802008-07-23 21:30:05 -0700409 int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
410
411 BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
Miklos Szeredi8f236802008-07-23 21:30:05 -0700412 strcpy(mount_crypt_stat->global_default_cipher_name,
413 ECRYPTFS_DEFAULT_CIPHER);
Michael Halcrow237fead2006-10-04 02:16:22 -0700414 }
Michael Halcrow87c94c42009-01-06 14:42:01 -0800415 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
416 && !fn_cipher_name_set)
417 strcpy(mount_crypt_stat->global_default_fn_cipher_name,
418 mount_crypt_stat->global_default_cipher_name);
419 if (!cipher_key_bytes_set)
Michael Halcrowe5d9cbd2006-10-30 22:07:16 -0800420 mount_crypt_stat->global_default_cipher_key_size = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800421 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
422 && !fn_cipher_key_bytes_set)
423 mount_crypt_stat->global_default_fn_cipher_key_bytes =
424 mount_crypt_stat->global_default_cipher_key_size;
Tim Sally5f5b3312012-07-12 19:10:24 -0400425
426 cipher_code = ecryptfs_code_for_cipher_string(
427 mount_crypt_stat->global_default_cipher_name,
428 mount_crypt_stat->global_default_cipher_key_size);
429 if (!cipher_code) {
430 ecryptfs_printk(KERN_ERR,
431 "eCryptfs doesn't support cipher: %s",
432 mount_crypt_stat->global_default_cipher_name);
433 rc = -EINVAL;
434 goto out;
435 }
436
Eric Sandeenaf440f52008-02-06 01:38:37 -0800437 mutex_lock(&key_tfm_list_mutex);
438 if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
Michael Halcrow87c94c42009-01-06 14:42:01 -0800439 NULL)) {
Eric Sandeenaf440f52008-02-06 01:38:37 -0800440 rc = ecryptfs_add_new_key_tfm(
441 NULL, mount_crypt_stat->global_default_cipher_name,
442 mount_crypt_stat->global_default_cipher_key_size);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800443 if (rc) {
444 printk(KERN_ERR "Error attempting to initialize "
445 "cipher with name = [%s] and key size = [%td]; "
446 "rc = [%d]\n",
447 mount_crypt_stat->global_default_cipher_name,
448 mount_crypt_stat->global_default_cipher_key_size,
449 rc);
450 rc = -EINVAL;
451 mutex_unlock(&key_tfm_list_mutex);
452 goto out;
453 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700454 }
Michael Halcrow87c94c42009-01-06 14:42:01 -0800455 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
456 && !ecryptfs_tfm_exists(
457 mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
458 rc = ecryptfs_add_new_key_tfm(
459 NULL, mount_crypt_stat->global_default_fn_cipher_name,
460 mount_crypt_stat->global_default_fn_cipher_key_bytes);
461 if (rc) {
462 printk(KERN_ERR "Error attempting to initialize "
463 "cipher with name = [%s] and key size = [%td]; "
464 "rc = [%d]\n",
465 mount_crypt_stat->global_default_fn_cipher_name,
466 mount_crypt_stat->global_default_fn_cipher_key_bytes,
467 rc);
468 rc = -EINVAL;
469 mutex_unlock(&key_tfm_list_mutex);
470 goto out;
471 }
472 }
473 mutex_unlock(&key_tfm_list_mutex);
Michael Halcrow5dda6992007-10-16 01:28:06 -0700474 rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800475 if (rc)
Michael Halcrowf4aad162007-10-16 01:27:53 -0700476 printk(KERN_WARNING "One or more global auth toks could not "
477 "properly register; rc = [%d]\n", rc);
Michael Halcrow237fead2006-10-04 02:16:22 -0700478out:
479 return rc;
480}
481
482struct kmem_cache *ecryptfs_sb_info_cache;
Al Viro44031582010-05-17 00:59:46 -0400483static struct file_system_type ecryptfs_fs_type;
Michael Halcrow237fead2006-10-04 02:16:22 -0700484
485/**
Michael Halcrow237fead2006-10-04 02:16:22 -0700486 * ecryptfs_get_sb
487 * @fs_type
488 * @flags
489 * @dev_name: The path to mount over
490 * @raw_data: The options passed into the kernel
Michael Halcrow237fead2006-10-04 02:16:22 -0700491 */
Al Viro4d143be2010-07-26 13:33:36 +0400492static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
493 const char *dev_name, void *raw_data)
Michael Halcrow237fead2006-10-04 02:16:22 -0700494{
Al Viro2ccde7c2010-03-21 12:24:29 -0400495 struct super_block *s;
496 struct ecryptfs_sb_info *sbi;
497 struct ecryptfs_dentry_info *root_info;
498 const char *err = "Getting sb failed";
Al Viro66cb7662011-01-12 20:04:37 -0500499 struct inode *inode;
500 struct path path;
John Johansen76435542011-07-22 08:14:15 -0700501 uid_t check_ruid;
Michael Halcrow237fead2006-10-04 02:16:22 -0700502 int rc;
Michael Halcrow237fead2006-10-04 02:16:22 -0700503
Al Viro2ccde7c2010-03-21 12:24:29 -0400504 sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
505 if (!sbi) {
506 rc = -ENOMEM;
Michael Halcrow237fead2006-10-04 02:16:22 -0700507 goto out;
508 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400509
John Johansen76435542011-07-22 08:14:15 -0700510 rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid);
Michael Halcrow237fead2006-10-04 02:16:22 -0700511 if (rc) {
Al Viro2ccde7c2010-03-21 12:24:29 -0400512 err = "Error parsing options";
513 goto out;
Michael Halcrow237fead2006-10-04 02:16:22 -0700514 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400515
David Howells9249e172012-06-25 12:55:37 +0100516 s = sget(fs_type, NULL, set_anon_super, flags, NULL);
Al Viro2ccde7c2010-03-21 12:24:29 -0400517 if (IS_ERR(s)) {
518 rc = PTR_ERR(s);
519 goto out;
520 }
521
Al Viro2ccde7c2010-03-21 12:24:29 -0400522 rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
Al Viro66cb7662011-01-12 20:04:37 -0500523 if (rc)
524 goto out1;
Al Viro2ccde7c2010-03-21 12:24:29 -0400525
526 ecryptfs_set_superblock_private(s, sbi);
527 s->s_bdi = &sbi->bdi;
528
529 /* ->kill_sb() will take care of sbi after that point */
530 sbi = NULL;
531 s->s_op = &ecryptfs_sops;
Al Viro66cb7662011-01-12 20:04:37 -0500532 s->s_d_op = &ecryptfs_dops;
533
534 err = "Reading sb failed";
535 rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
536 if (rc) {
537 ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
538 goto out1;
539 }
540 if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
541 rc = -EINVAL;
542 printk(KERN_ERR "Mount on filesystem of type "
543 "eCryptfs explicitly disallowed due to "
544 "known incompatibilities\n");
545 goto out_free;
546 }
John Johansen76435542011-07-22 08:14:15 -0700547
Eric W. Biedermancdf8c582012-02-07 16:24:33 -0800548 if (check_ruid && !uid_eq(path.dentry->d_inode->i_uid, current_uid())) {
John Johansen76435542011-07-22 08:14:15 -0700549 rc = -EPERM;
550 printk(KERN_ERR "Mount of device (uid: %d) not owned by "
551 "requested user (uid: %d)\n",
Eric W. Biedermancdf8c582012-02-07 16:24:33 -0800552 i_uid_read(path.dentry->d_inode),
553 from_kuid(&init_user_ns, current_uid()));
John Johansen76435542011-07-22 08:14:15 -0700554 goto out_free;
555 }
556
Al Viro66cb7662011-01-12 20:04:37 -0500557 ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
Tyler Hicks069ddcd2012-06-11 15:42:32 -0700558
559 /**
560 * Set the POSIX ACL flag based on whether they're enabled in the lower
561 * mount. Force a read-only eCryptfs mount if the lower mount is ro.
562 * Allow a ro eCryptfs mount even when the lower mount is rw.
563 */
564 s->s_flags = flags & ~MS_POSIXACL;
565 s->s_flags |= path.dentry->d_sb->s_flags & (MS_RDONLY | MS_POSIXACL);
566
Al Viro66cb7662011-01-12 20:04:37 -0500567 s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
568 s->s_blocksize = path.dentry->d_sb->s_blocksize;
Roberto Sassu070baa52010-11-03 11:11:22 +0100569 s->s_magic = ECRYPTFS_SUPER_MAGIC;
Al Viro66cb7662011-01-12 20:04:37 -0500570
571 inode = ecryptfs_get_inode(path.dentry->d_inode, s);
572 rc = PTR_ERR(inode);
573 if (IS_ERR(inode))
574 goto out_free;
575
Al Viro48fde702012-01-08 22:15:13 -0500576 s->s_root = d_make_root(inode);
Al Viro66cb7662011-01-12 20:04:37 -0500577 if (!s->s_root) {
Al Viro66cb7662011-01-12 20:04:37 -0500578 rc = -ENOMEM;
579 goto out_free;
580 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400581
582 rc = -ENOMEM;
Al Viro2ccde7c2010-03-21 12:24:29 -0400583 root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
Al Viro66cb7662011-01-12 20:04:37 -0500584 if (!root_info)
585 goto out_free;
586
Al Viro2ccde7c2010-03-21 12:24:29 -0400587 /* ->kill_sb() will take care of root_info */
588 ecryptfs_set_dentry_private(s->s_root, root_info);
Al Viro66cb7662011-01-12 20:04:37 -0500589 ecryptfs_set_dentry_lower(s->s_root, path.dentry);
590 ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt);
591
Al Viro2ccde7c2010-03-21 12:24:29 -0400592 s->s_flags |= MS_ACTIVE;
Al Viro4d143be2010-07-26 13:33:36 +0400593 return dget(s->s_root);
Al Viro2ccde7c2010-03-21 12:24:29 -0400594
Al Viro66cb7662011-01-12 20:04:37 -0500595out_free:
596 path_put(&path);
597out1:
598 deactivate_locked_super(s);
Michael Halcrow237fead2006-10-04 02:16:22 -0700599out:
Al Viro2ccde7c2010-03-21 12:24:29 -0400600 if (sbi) {
601 ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
602 kmem_cache_free(ecryptfs_sb_info_cache, sbi);
603 }
604 printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
Al Viro4d143be2010-07-26 13:33:36 +0400605 return ERR_PTR(rc);
Michael Halcrow237fead2006-10-04 02:16:22 -0700606}
607
608/**
609 * ecryptfs_kill_block_super
610 * @sb: The ecryptfs super block
611 *
612 * Used to bring the superblock down and free the private data.
Michael Halcrow237fead2006-10-04 02:16:22 -0700613 */
614static void ecryptfs_kill_block_super(struct super_block *sb)
615{
Al Virodecabd62010-03-20 22:32:26 -0400616 struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
617 kill_anon_super(sb);
618 if (!sb_info)
619 return;
620 ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
621 bdi_destroy(&sb_info->bdi);
622 kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
Michael Halcrow237fead2006-10-04 02:16:22 -0700623}
624
625static struct file_system_type ecryptfs_fs_type = {
626 .owner = THIS_MODULE,
627 .name = "ecryptfs",
Al Viro4d143be2010-07-26 13:33:36 +0400628 .mount = ecryptfs_mount,
Michael Halcrow237fead2006-10-04 02:16:22 -0700629 .kill_sb = ecryptfs_kill_block_super,
630 .fs_flags = 0
631};
632
633/**
634 * inode_info_init_once
635 *
636 * Initializes the ecryptfs_inode_info_cache when it is created
637 */
638static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700639inode_info_init_once(void *vptr)
Michael Halcrow237fead2006-10-04 02:16:22 -0700640{
641 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
642
Christoph Lametera35afb82007-05-16 22:10:57 -0700643 inode_init_once(&ei->vfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700644}
645
646static struct ecryptfs_cache_info {
Christoph Lametere18b8902006-12-06 20:33:20 -0800647 struct kmem_cache **cache;
Michael Halcrow237fead2006-10-04 02:16:22 -0700648 const char *name;
649 size_t size;
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700650 void (*ctor)(void *obj);
Michael Halcrow237fead2006-10-04 02:16:22 -0700651} ecryptfs_cache_infos[] = {
652 {
653 .cache = &ecryptfs_auth_tok_list_item_cache,
654 .name = "ecryptfs_auth_tok_list_item",
655 .size = sizeof(struct ecryptfs_auth_tok_list_item),
656 },
657 {
658 .cache = &ecryptfs_file_info_cache,
659 .name = "ecryptfs_file_cache",
660 .size = sizeof(struct ecryptfs_file_info),
661 },
662 {
663 .cache = &ecryptfs_dentry_info_cache,
664 .name = "ecryptfs_dentry_info_cache",
665 .size = sizeof(struct ecryptfs_dentry_info),
666 },
667 {
668 .cache = &ecryptfs_inode_info_cache,
669 .name = "ecryptfs_inode_cache",
670 .size = sizeof(struct ecryptfs_inode_info),
671 .ctor = inode_info_init_once,
672 },
673 {
674 .cache = &ecryptfs_sb_info_cache,
675 .name = "ecryptfs_sb_cache",
676 .size = sizeof(struct ecryptfs_sb_info),
677 },
678 {
Tyler Hicks30632872011-05-24 05:11:12 -0500679 .cache = &ecryptfs_header_cache,
680 .name = "ecryptfs_headers",
Michael Halcrow237fead2006-10-04 02:16:22 -0700681 .size = PAGE_CACHE_SIZE,
682 },
683 {
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800684 .cache = &ecryptfs_xattr_cache,
685 .name = "ecryptfs_xattr_cache",
686 .size = PAGE_CACHE_SIZE,
687 },
688 {
Michael Halcroweb95e7f2007-02-16 01:28:40 -0800689 .cache = &ecryptfs_key_record_cache,
690 .name = "ecryptfs_key_record_cache",
691 .size = sizeof(struct ecryptfs_key_record),
692 },
Michael Halcrow956159c2007-10-16 01:27:55 -0700693 {
694 .cache = &ecryptfs_key_sig_cache,
695 .name = "ecryptfs_key_sig_cache",
696 .size = sizeof(struct ecryptfs_key_sig),
697 },
698 {
699 .cache = &ecryptfs_global_auth_tok_cache,
700 .name = "ecryptfs_global_auth_tok_cache",
701 .size = sizeof(struct ecryptfs_global_auth_tok),
702 },
703 {
704 .cache = &ecryptfs_key_tfm_cache,
705 .name = "ecryptfs_key_tfm_cache",
706 .size = sizeof(struct ecryptfs_key_tfm),
707 },
Michael Halcrow237fead2006-10-04 02:16:22 -0700708};
709
710static void ecryptfs_free_kmem_caches(void)
711{
712 int i;
713
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000714 /*
715 * Make sure all delayed rcu free inodes are flushed before we
716 * destroy cache.
717 */
718 rcu_barrier();
719
Michael Halcrow237fead2006-10-04 02:16:22 -0700720 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
721 struct ecryptfs_cache_info *info;
722
723 info = &ecryptfs_cache_infos[i];
724 if (*(info->cache))
725 kmem_cache_destroy(*(info->cache));
726 }
727}
728
729/**
730 * ecryptfs_init_kmem_caches
731 *
732 * Returns zero on success; non-zero otherwise
733 */
734static int ecryptfs_init_kmem_caches(void)
735{
736 int i;
737
738 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
739 struct ecryptfs_cache_info *info;
740
741 info = &ecryptfs_cache_infos[i];
742 *(info->cache) = kmem_cache_create(info->name, info->size,
Paul Mundt20c2df82007-07-20 10:11:58 +0900743 0, SLAB_HWCACHE_ALIGN, info->ctor);
Michael Halcrow237fead2006-10-04 02:16:22 -0700744 if (!*(info->cache)) {
745 ecryptfs_free_kmem_caches();
746 ecryptfs_printk(KERN_WARNING, "%s: "
747 "kmem_cache_create failed\n",
748 info->name);
749 return -ENOMEM;
750 }
751 }
752 return 0;
753}
754
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800755static struct kobject *ecryptfs_kobj;
Michael Halcrow237fead2006-10-04 02:16:22 -0700756
Kay Sievers386f2752007-11-02 13:47:53 +0100757static ssize_t version_show(struct kobject *kobj,
758 struct kobj_attribute *attr, char *buff)
Michael Halcrow237fead2006-10-04 02:16:22 -0700759{
760 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
761}
762
Kay Sievers386f2752007-11-02 13:47:53 +0100763static struct kobj_attribute version_attr = __ATTR_RO(version);
Michael Halcrow237fead2006-10-04 02:16:22 -0700764
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700765static struct attribute *attributes[] = {
766 &version_attr.attr,
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700767 NULL,
768};
769
770static struct attribute_group attr_group = {
771 .attrs = attributes,
772};
Michael Halcrow237fead2006-10-04 02:16:22 -0700773
774static int do_sysfs_registration(void)
775{
776 int rc;
777
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800778 ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
779 if (!ecryptfs_kobj) {
Greg Kroah-Hartman917e8652007-10-29 20:13:17 +0100780 printk(KERN_ERR "Unable to create ecryptfs kset\n");
781 rc = -ENOMEM;
Michael Halcrow237fead2006-10-04 02:16:22 -0700782 goto out;
783 }
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800784 rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
Michael Halcrow237fead2006-10-04 02:16:22 -0700785 if (rc) {
786 printk(KERN_ERR
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700787 "Unable to create ecryptfs version attributes\n");
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800788 kobject_put(ecryptfs_kobj);
Michael Halcrow237fead2006-10-04 02:16:22 -0700789 }
790out:
791 return rc;
792}
793
Ryusuke Konishia75de1b2007-08-10 13:00:56 -0700794static void do_sysfs_unregistration(void)
795{
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800796 sysfs_remove_group(ecryptfs_kobj, &attr_group);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800797 kobject_put(ecryptfs_kobj);
Ryusuke Konishia75de1b2007-08-10 13:00:56 -0700798}
799
Michael Halcrow237fead2006-10-04 02:16:22 -0700800static int __init ecryptfs_init(void)
801{
802 int rc;
803
804 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
805 rc = -EINVAL;
806 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
807 "larger than the host's page size, and so "
808 "eCryptfs cannot run on this system. The "
Joe Perches888d57b2010-11-10 15:46:16 -0800809 "default eCryptfs extent size is [%u] bytes; "
810 "the page size is [%lu] bytes.\n",
811 ECRYPTFS_DEFAULT_EXTENT_SIZE,
812 (unsigned long)PAGE_CACHE_SIZE);
Michael Halcrow237fead2006-10-04 02:16:22 -0700813 goto out;
814 }
815 rc = ecryptfs_init_kmem_caches();
816 if (rc) {
817 printk(KERN_ERR
818 "Failed to allocate one or more kmem_cache objects\n");
819 goto out;
820 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700821 rc = do_sysfs_registration();
822 if (rc) {
823 printk(KERN_ERR "sysfs registration failed\n");
Al Viro0794f562012-03-17 21:29:13 -0400824 goto out_free_kmem_caches;
Michael Halcrow237fead2006-10-04 02:16:22 -0700825 }
Michael Halcrow746f1e52008-07-23 21:30:02 -0700826 rc = ecryptfs_init_kthread();
827 if (rc) {
828 printk(KERN_ERR "%s: kthread initialization failed; "
829 "rc = [%d]\n", __func__, rc);
830 goto out_do_sysfs_unregistration;
831 }
Tyler Hicks624ae522008-10-15 22:02:51 -0700832 rc = ecryptfs_init_messaging();
Michael Halcrowdddfa462007-02-12 00:53:44 -0800833 if (rc) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300834 printk(KERN_ERR "Failure occurred while attempting to "
Tyler Hicks624ae522008-10-15 22:02:51 -0700835 "initialize the communications channel to "
836 "ecryptfsd\n");
Michael Halcrow746f1e52008-07-23 21:30:02 -0700837 goto out_destroy_kthread;
Michael Halcrow956159c2007-10-16 01:27:55 -0700838 }
839 rc = ecryptfs_init_crypto();
840 if (rc) {
841 printk(KERN_ERR "Failure whilst attempting to init crypto; "
842 "rc = [%d]\n", rc);
Michael Halcrowcf81f892007-10-16 01:28:07 -0700843 goto out_release_messaging;
Michael Halcrowdddfa462007-02-12 00:53:44 -0800844 }
Al Viro0794f562012-03-17 21:29:13 -0400845 rc = register_filesystem(&ecryptfs_fs_type);
846 if (rc) {
847 printk(KERN_ERR "Failed to register filesystem\n");
848 goto out_destroy_crypto;
849 }
Eric Sandeen2830bfd2008-02-06 01:38:34 -0800850 if (ecryptfs_verbosity > 0)
851 printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
852 "will be written to the syslog!\n", ecryptfs_verbosity);
853
Michael Halcrowcf81f892007-10-16 01:28:07 -0700854 goto out;
Al Viro0794f562012-03-17 21:29:13 -0400855out_destroy_crypto:
856 ecryptfs_destroy_crypto();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700857out_release_messaging:
Tyler Hicks624ae522008-10-15 22:02:51 -0700858 ecryptfs_release_messaging();
Michael Halcrow746f1e52008-07-23 21:30:02 -0700859out_destroy_kthread:
860 ecryptfs_destroy_kthread();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700861out_do_sysfs_unregistration:
862 do_sysfs_unregistration();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700863out_free_kmem_caches:
864 ecryptfs_free_kmem_caches();
Michael Halcrow237fead2006-10-04 02:16:22 -0700865out:
866 return rc;
867}
868
869static void __exit ecryptfs_exit(void)
870{
Michael Halcrowcf81f892007-10-16 01:28:07 -0700871 int rc;
872
873 rc = ecryptfs_destroy_crypto();
874 if (rc)
875 printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
876 "rc = [%d]\n", rc);
Tyler Hicks624ae522008-10-15 22:02:51 -0700877 ecryptfs_release_messaging();
Michael Halcrow746f1e52008-07-23 21:30:02 -0700878 ecryptfs_destroy_kthread();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700879 do_sysfs_unregistration();
Michael Halcrow237fead2006-10-04 02:16:22 -0700880 unregister_filesystem(&ecryptfs_fs_type);
881 ecryptfs_free_kmem_caches();
882}
883
884MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
885MODULE_DESCRIPTION("eCryptfs");
886
887MODULE_LICENSE("GPL");
888
889module_init(ecryptfs_init)
890module_exit(ecryptfs_exit)