blob: 4f4d0474bee961e456d015a08f5891b686b9033c [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();
Matthew Wilcoxcc18ec32013-06-15 07:55:59 -0400123 struct path *path = ecryptfs_dentry_to_lower_path(dentry);
Tyler Hicks332ab162011-04-14 15:35:11 -0500124 int rc;
Michael Halcrow4981e082007-10-16 01:28:09 -0700125
Matthew Wilcoxcc18ec32013-06-15 07:55:59 -0400126 rc = ecryptfs_privileged_open(lower_file, path->dentry, path->mnt,
Tyler Hicks332ab162011-04-14 15:35:11 -0500127 cred);
128 if (rc) {
129 printk(KERN_ERR "Error opening lower file "
130 "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
Matthew Wilcoxcc18ec32013-06-15 07:55:59 -0400131 "rc = [%d]\n", path->dentry, path->mnt, rc);
Tyler Hicks332ab162011-04-14 15:35:11 -0500132 (*lower_file) = NULL;
Michael Halcrow4981e082007-10-16 01:28:09 -0700133 }
Michael Halcrow4981e082007-10-16 01:28:09 -0700134 return rc;
135}
136
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500137int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
Tyler Hicks332ab162011-04-14 15:35:11 -0500138{
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500139 struct ecryptfs_inode_info *inode_info;
Tyler Hicks332ab162011-04-14 15:35:11 -0500140 int count, rc = 0;
141
Tyler Hicks3b06b3e2011-05-24 03:49:02 -0500142 inode_info = ecryptfs_inode_to_private(inode);
Tyler Hicks332ab162011-04-14 15:35:11 -0500143 mutex_lock(&inode_info->lower_file_mutex);
144 count = atomic_inc_return(&inode_info->lower_file_count);
145 if (WARN_ON_ONCE(count < 1))
146 rc = -EINVAL;
147 else if (count == 1) {
148 rc = ecryptfs_init_lower_file(dentry,
149 &inode_info->lower_file);
150 if (rc)
151 atomic_set(&inode_info->lower_file_count, 0);
152 }
153 mutex_unlock(&inode_info->lower_file_mutex);
154 return rc;
155}
156
157void ecryptfs_put_lower_file(struct inode *inode)
158{
159 struct ecryptfs_inode_info *inode_info;
160
161 inode_info = ecryptfs_inode_to_private(inode);
162 if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count,
163 &inode_info->lower_file_mutex)) {
Tyler Hicks7149f252012-09-12 18:02:46 -0700164 filemap_write_and_wait(inode->i_mapping);
Tyler Hicks332ab162011-04-14 15:35:11 -0500165 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;
Tim Sally5f5b3312012-07-12 19:10:24 -0400282 u8 cipher_code;
Michael Halcrow237fead2006-10-04 02:16:22 -0700283
John Johansen76435542011-07-22 08:14:15 -0700284 *check_ruid = 0;
285
Michael Halcrow237fead2006-10-04 02:16:22 -0700286 if (!options) {
287 rc = -EINVAL;
288 goto out;
289 }
Michael Halcrow956159c2007-10-16 01:27:55 -0700290 ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
Michael Halcrow237fead2006-10-04 02:16:22 -0700291 while ((p = strsep(&options, ",")) != NULL) {
292 if (!*p)
293 continue;
294 token = match_token(p, tokens, args);
295 switch (token) {
296 case ecryptfs_opt_sig:
297 case ecryptfs_opt_ecryptfs_sig:
298 sig_src = args[0].from;
Michael Halcrowf4aad162007-10-16 01:27:53 -0700299 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700300 sig_src, 0);
Michael Halcrowf4aad162007-10-16 01:27:53 -0700301 if (rc) {
302 printk(KERN_ERR "Error attempting to register "
303 "global sig; rc = [%d]\n", rc);
304 goto out;
305 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700306 sig_set = 1;
307 break;
Michael Halcrow237fead2006-10-04 02:16:22 -0700308 case ecryptfs_opt_cipher:
309 case ecryptfs_opt_ecryptfs_cipher:
310 cipher_name_src = args[0].from;
311 cipher_name_dst =
312 mount_crypt_stat->
313 global_default_cipher_name;
314 strncpy(cipher_name_dst, cipher_name_src,
315 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800316 cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
Michael Halcrow237fead2006-10-04 02:16:22 -0700317 cipher_name_set = 1;
318 break;
319 case ecryptfs_opt_ecryptfs_key_bytes:
320 cipher_key_bytes_src = args[0].from;
321 cipher_key_bytes =
322 (int)simple_strtol(cipher_key_bytes_src,
323 &cipher_key_bytes_src, 0);
324 mount_crypt_stat->global_default_cipher_key_size =
325 cipher_key_bytes;
Michael Halcrow237fead2006-10-04 02:16:22 -0700326 cipher_key_bytes_set = 1;
327 break;
328 case ecryptfs_opt_passthrough:
329 mount_crypt_stat->flags |=
330 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
331 break;
Michael Halcrow17398952007-02-12 00:53:45 -0800332 case ecryptfs_opt_xattr_metadata:
333 mount_crypt_stat->flags |=
334 ECRYPTFS_XATTR_METADATA_ENABLED;
335 break;
336 case ecryptfs_opt_encrypted_view:
337 mount_crypt_stat->flags |=
338 ECRYPTFS_XATTR_METADATA_ENABLED;
339 mount_crypt_stat->flags |=
340 ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
341 break;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800342 case ecryptfs_opt_fnek_sig:
343 fnek_src = args[0].from;
344 fnek_dst =
345 mount_crypt_stat->global_default_fnek_sig;
346 strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
347 mount_crypt_stat->global_default_fnek_sig[
348 ECRYPTFS_SIG_SIZE_HEX] = '\0';
349 rc = ecryptfs_add_global_auth_tok(
350 mount_crypt_stat,
Tyler Hicks84814d62009-03-13 13:51:59 -0700351 mount_crypt_stat->global_default_fnek_sig,
352 ECRYPTFS_AUTH_TOK_FNEK);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800353 if (rc) {
354 printk(KERN_ERR "Error attempting to register "
355 "global fnek sig [%s]; rc = [%d]\n",
356 mount_crypt_stat->global_default_fnek_sig,
357 rc);
358 goto out;
359 }
360 mount_crypt_stat->flags |=
361 (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
362 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
363 break;
364 case ecryptfs_opt_fn_cipher:
365 fn_cipher_name_src = args[0].from;
366 fn_cipher_name_dst =
367 mount_crypt_stat->global_default_fn_cipher_name;
368 strncpy(fn_cipher_name_dst, fn_cipher_name_src,
369 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
370 mount_crypt_stat->global_default_fn_cipher_name[
371 ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
372 fn_cipher_name_set = 1;
373 break;
374 case ecryptfs_opt_fn_cipher_key_bytes:
375 fn_cipher_key_bytes_src = args[0].from;
376 fn_cipher_key_bytes =
377 (int)simple_strtol(fn_cipher_key_bytes_src,
378 &fn_cipher_key_bytes_src, 0);
379 mount_crypt_stat->global_default_fn_cipher_key_bytes =
380 fn_cipher_key_bytes;
381 fn_cipher_key_bytes_set = 1;
382 break;
Tyler Hickse77cc8d2009-04-22 04:08:46 -0500383 case ecryptfs_opt_unlink_sigs:
384 mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
385 break;
Roberto Sassuf16feb52010-10-06 18:31:32 +0200386 case ecryptfs_opt_mount_auth_tok_only:
387 mount_crypt_stat->flags |=
388 ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
389 break;
John Johansen76435542011-07-22 08:14:15 -0700390 case ecryptfs_opt_check_dev_ruid:
391 *check_ruid = 1;
392 break;
Michael Halcrow237fead2006-10-04 02:16:22 -0700393 case ecryptfs_opt_err:
394 default:
Michael Halcrow87c94c42009-01-06 14:42:01 -0800395 printk(KERN_WARNING
396 "%s: eCryptfs: unrecognized option [%s]\n",
397 __func__, p);
Michael Halcrow237fead2006-10-04 02:16:22 -0700398 }
399 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700400 if (!sig_set) {
401 rc = -EINVAL;
Michael Halcrow956159c2007-10-16 01:27:55 -0700402 ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
403 "auth tok signature as a mount "
Michael Halcrow237fead2006-10-04 02:16:22 -0700404 "parameter; see the eCryptfs README\n");
405 goto out;
406 }
407 if (!cipher_name_set) {
Miklos Szeredi8f236802008-07-23 21:30:05 -0700408 int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
409
Colin Ian King2a559a82015-02-23 11:34:10 +0000410 BUG_ON(cipher_name_len > ECRYPTFS_MAX_CIPHER_NAME_SIZE);
Miklos Szeredi8f236802008-07-23 21:30:05 -0700411 strcpy(mount_crypt_stat->global_default_cipher_name,
412 ECRYPTFS_DEFAULT_CIPHER);
Michael Halcrow237fead2006-10-04 02:16:22 -0700413 }
Michael Halcrow87c94c42009-01-06 14:42:01 -0800414 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
415 && !fn_cipher_name_set)
416 strcpy(mount_crypt_stat->global_default_fn_cipher_name,
417 mount_crypt_stat->global_default_cipher_name);
418 if (!cipher_key_bytes_set)
Michael Halcrowe5d9cbd2006-10-30 22:07:16 -0800419 mount_crypt_stat->global_default_cipher_key_size = 0;
Michael Halcrow87c94c42009-01-06 14:42:01 -0800420 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
421 && !fn_cipher_key_bytes_set)
422 mount_crypt_stat->global_default_fn_cipher_key_bytes =
423 mount_crypt_stat->global_default_cipher_key_size;
Tim Sally5f5b3312012-07-12 19:10:24 -0400424
425 cipher_code = ecryptfs_code_for_cipher_string(
426 mount_crypt_stat->global_default_cipher_name,
427 mount_crypt_stat->global_default_cipher_key_size);
428 if (!cipher_code) {
429 ecryptfs_printk(KERN_ERR,
430 "eCryptfs doesn't support cipher: %s",
431 mount_crypt_stat->global_default_cipher_name);
432 rc = -EINVAL;
433 goto out;
434 }
435
Eric Sandeenaf440f52008-02-06 01:38:37 -0800436 mutex_lock(&key_tfm_list_mutex);
437 if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
Michael Halcrow87c94c42009-01-06 14:42:01 -0800438 NULL)) {
Eric Sandeenaf440f52008-02-06 01:38:37 -0800439 rc = ecryptfs_add_new_key_tfm(
440 NULL, mount_crypt_stat->global_default_cipher_name,
441 mount_crypt_stat->global_default_cipher_key_size);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800442 if (rc) {
443 printk(KERN_ERR "Error attempting to initialize "
444 "cipher with name = [%s] and key size = [%td]; "
445 "rc = [%d]\n",
446 mount_crypt_stat->global_default_cipher_name,
447 mount_crypt_stat->global_default_cipher_key_size,
448 rc);
449 rc = -EINVAL;
450 mutex_unlock(&key_tfm_list_mutex);
451 goto out;
452 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700453 }
Michael Halcrow87c94c42009-01-06 14:42:01 -0800454 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
455 && !ecryptfs_tfm_exists(
456 mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
457 rc = ecryptfs_add_new_key_tfm(
458 NULL, mount_crypt_stat->global_default_fn_cipher_name,
459 mount_crypt_stat->global_default_fn_cipher_key_bytes);
460 if (rc) {
461 printk(KERN_ERR "Error attempting to initialize "
462 "cipher with name = [%s] and key size = [%td]; "
463 "rc = [%d]\n",
464 mount_crypt_stat->global_default_fn_cipher_name,
465 mount_crypt_stat->global_default_fn_cipher_key_bytes,
466 rc);
467 rc = -EINVAL;
468 mutex_unlock(&key_tfm_list_mutex);
469 goto out;
470 }
471 }
472 mutex_unlock(&key_tfm_list_mutex);
Michael Halcrow5dda6992007-10-16 01:28:06 -0700473 rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
Michael Halcrow87c94c42009-01-06 14:42:01 -0800474 if (rc)
Michael Halcrowf4aad162007-10-16 01:27:53 -0700475 printk(KERN_WARNING "One or more global auth toks could not "
476 "properly register; rc = [%d]\n", rc);
Michael Halcrow237fead2006-10-04 02:16:22 -0700477out:
478 return rc;
479}
480
481struct kmem_cache *ecryptfs_sb_info_cache;
Al Viro44031582010-05-17 00:59:46 -0400482static struct file_system_type ecryptfs_fs_type;
Michael Halcrow237fead2006-10-04 02:16:22 -0700483
484/**
Michael Halcrow237fead2006-10-04 02:16:22 -0700485 * ecryptfs_get_sb
486 * @fs_type
487 * @flags
488 * @dev_name: The path to mount over
489 * @raw_data: The options passed into the kernel
Michael Halcrow237fead2006-10-04 02:16:22 -0700490 */
Al Viro4d143be2010-07-26 13:33:36 +0400491static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
492 const char *dev_name, void *raw_data)
Michael Halcrow237fead2006-10-04 02:16:22 -0700493{
Al Viro2ccde7c2010-03-21 12:24:29 -0400494 struct super_block *s;
495 struct ecryptfs_sb_info *sbi;
Tyler Hicks332b1222014-10-07 15:51:55 -0500496 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
Al Viro2ccde7c2010-03-21 12:24:29 -0400497 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 }
Tyler Hicks332b1222014-10-07 15:51:55 -0500515 mount_crypt_stat = &sbi->mount_crypt_stat;
Al Viro2ccde7c2010-03-21 12:24:29 -0400516
David Howells9249e172012-06-25 12:55:37 +0100517 s = sget(fs_type, NULL, set_anon_super, flags, NULL);
Al Viro2ccde7c2010-03-21 12:24:29 -0400518 if (IS_ERR(s)) {
519 rc = PTR_ERR(s);
520 goto out;
521 }
522
Christoph Hellwigb4caecd2015-01-14 10:42:32 +0100523 rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs");
Al Viro66cb7662011-01-12 20:04:37 -0500524 if (rc)
525 goto out1;
Al Viro2ccde7c2010-03-21 12:24:29 -0400526
527 ecryptfs_set_superblock_private(s, sbi);
528 s->s_bdi = &sbi->bdi;
529
530 /* ->kill_sb() will take care of sbi after that point */
531 sbi = NULL;
532 s->s_op = &ecryptfs_sops;
Al Viro66cb7662011-01-12 20:04:37 -0500533 s->s_d_op = &ecryptfs_dops;
534
535 err = "Reading sb failed";
536 rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
537 if (rc) {
538 ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
539 goto out1;
540 }
541 if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
542 rc = -EINVAL;
543 printk(KERN_ERR "Mount on filesystem of type "
544 "eCryptfs explicitly disallowed due to "
545 "known incompatibilities\n");
546 goto out_free;
547 }
John Johansen76435542011-07-22 08:14:15 -0700548
David Howells2b0143b2015-03-17 22:25:59 +0000549 if (check_ruid && !uid_eq(d_inode(path.dentry)->i_uid, current_uid())) {
John Johansen76435542011-07-22 08:14:15 -0700550 rc = -EPERM;
551 printk(KERN_ERR "Mount of device (uid: %d) not owned by "
552 "requested user (uid: %d)\n",
David Howells2b0143b2015-03-17 22:25:59 +0000553 i_uid_read(d_inode(path.dentry)),
Eric W. Biedermancdf8c582012-02-07 16:24:33 -0800554 from_kuid(&init_user_ns, current_uid()));
John Johansen76435542011-07-22 08:14:15 -0700555 goto out_free;
556 }
557
Al Viro66cb7662011-01-12 20:04:37 -0500558 ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
Tyler Hicks069ddcd2012-06-11 15:42:32 -0700559
560 /**
561 * Set the POSIX ACL flag based on whether they're enabled in the lower
Tyler Hicks332b1222014-10-07 15:51:55 -0500562 * mount.
Tyler Hicks069ddcd2012-06-11 15:42:32 -0700563 */
564 s->s_flags = flags & ~MS_POSIXACL;
Tyler Hicks332b1222014-10-07 15:51:55 -0500565 s->s_flags |= path.dentry->d_sb->s_flags & MS_POSIXACL;
566
567 /**
568 * Force a read-only eCryptfs mount when:
569 * 1) The lower mount is ro
570 * 2) The ecryptfs_encrypted_view mount option is specified
571 */
572 if (path.dentry->d_sb->s_flags & MS_RDONLY ||
573 mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
574 s->s_flags |= MS_RDONLY;
Tyler Hicks069ddcd2012-06-11 15:42:32 -0700575
Al Viro66cb7662011-01-12 20:04:37 -0500576 s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
577 s->s_blocksize = path.dentry->d_sb->s_blocksize;
Roberto Sassu070baa52010-11-03 11:11:22 +0100578 s->s_magic = ECRYPTFS_SUPER_MAGIC;
Miklos Szeredi69c433e2014-10-24 00:14:39 +0200579 s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
580
581 rc = -EINVAL;
582 if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
583 pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
584 goto out_free;
585 }
Al Viro66cb7662011-01-12 20:04:37 -0500586
David Howells2b0143b2015-03-17 22:25:59 +0000587 inode = ecryptfs_get_inode(d_inode(path.dentry), s);
Al Viro66cb7662011-01-12 20:04:37 -0500588 rc = PTR_ERR(inode);
589 if (IS_ERR(inode))
590 goto out_free;
591
Al Viro48fde702012-01-08 22:15:13 -0500592 s->s_root = d_make_root(inode);
Al Viro66cb7662011-01-12 20:04:37 -0500593 if (!s->s_root) {
Al Viro66cb7662011-01-12 20:04:37 -0500594 rc = -ENOMEM;
595 goto out_free;
596 }
Al Viro2ccde7c2010-03-21 12:24:29 -0400597
598 rc = -ENOMEM;
Al Viro2ccde7c2010-03-21 12:24:29 -0400599 root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
Al Viro66cb7662011-01-12 20:04:37 -0500600 if (!root_info)
601 goto out_free;
602
Al Viro2ccde7c2010-03-21 12:24:29 -0400603 /* ->kill_sb() will take care of root_info */
604 ecryptfs_set_dentry_private(s->s_root, root_info);
Al Viro92dd1232013-09-15 20:50:13 -0400605 root_info->lower_path = path;
Al Viro66cb7662011-01-12 20:04:37 -0500606
Al Viro2ccde7c2010-03-21 12:24:29 -0400607 s->s_flags |= MS_ACTIVE;
Al Viro4d143be2010-07-26 13:33:36 +0400608 return dget(s->s_root);
Al Viro2ccde7c2010-03-21 12:24:29 -0400609
Al Viro66cb7662011-01-12 20:04:37 -0500610out_free:
611 path_put(&path);
612out1:
613 deactivate_locked_super(s);
Michael Halcrow237fead2006-10-04 02:16:22 -0700614out:
Al Viro2ccde7c2010-03-21 12:24:29 -0400615 if (sbi) {
616 ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
617 kmem_cache_free(ecryptfs_sb_info_cache, sbi);
618 }
619 printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
Al Viro4d143be2010-07-26 13:33:36 +0400620 return ERR_PTR(rc);
Michael Halcrow237fead2006-10-04 02:16:22 -0700621}
622
623/**
624 * ecryptfs_kill_block_super
625 * @sb: The ecryptfs super block
626 *
627 * Used to bring the superblock down and free the private data.
Michael Halcrow237fead2006-10-04 02:16:22 -0700628 */
629static void ecryptfs_kill_block_super(struct super_block *sb)
630{
Al Virodecabd62010-03-20 22:32:26 -0400631 struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
632 kill_anon_super(sb);
633 if (!sb_info)
634 return;
635 ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
636 bdi_destroy(&sb_info->bdi);
637 kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
Michael Halcrow237fead2006-10-04 02:16:22 -0700638}
639
640static struct file_system_type ecryptfs_fs_type = {
641 .owner = THIS_MODULE,
642 .name = "ecryptfs",
Al Viro4d143be2010-07-26 13:33:36 +0400643 .mount = ecryptfs_mount,
Michael Halcrow237fead2006-10-04 02:16:22 -0700644 .kill_sb = ecryptfs_kill_block_super,
645 .fs_flags = 0
646};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800647MODULE_ALIAS_FS("ecryptfs");
Michael Halcrow237fead2006-10-04 02:16:22 -0700648
649/**
650 * inode_info_init_once
651 *
652 * Initializes the ecryptfs_inode_info_cache when it is created
653 */
654static void
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700655inode_info_init_once(void *vptr)
Michael Halcrow237fead2006-10-04 02:16:22 -0700656{
657 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
658
Christoph Lametera35afb82007-05-16 22:10:57 -0700659 inode_init_once(&ei->vfs_inode);
Michael Halcrow237fead2006-10-04 02:16:22 -0700660}
661
662static struct ecryptfs_cache_info {
Christoph Lametere18b8902006-12-06 20:33:20 -0800663 struct kmem_cache **cache;
Michael Halcrow237fead2006-10-04 02:16:22 -0700664 const char *name;
665 size_t size;
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700666 void (*ctor)(void *obj);
Michael Halcrow237fead2006-10-04 02:16:22 -0700667} ecryptfs_cache_infos[] = {
668 {
669 .cache = &ecryptfs_auth_tok_list_item_cache,
670 .name = "ecryptfs_auth_tok_list_item",
671 .size = sizeof(struct ecryptfs_auth_tok_list_item),
672 },
673 {
674 .cache = &ecryptfs_file_info_cache,
675 .name = "ecryptfs_file_cache",
676 .size = sizeof(struct ecryptfs_file_info),
677 },
678 {
679 .cache = &ecryptfs_dentry_info_cache,
680 .name = "ecryptfs_dentry_info_cache",
681 .size = sizeof(struct ecryptfs_dentry_info),
682 },
683 {
684 .cache = &ecryptfs_inode_info_cache,
685 .name = "ecryptfs_inode_cache",
686 .size = sizeof(struct ecryptfs_inode_info),
687 .ctor = inode_info_init_once,
688 },
689 {
690 .cache = &ecryptfs_sb_info_cache,
691 .name = "ecryptfs_sb_cache",
692 .size = sizeof(struct ecryptfs_sb_info),
693 },
694 {
Tyler Hicks30632872011-05-24 05:11:12 -0500695 .cache = &ecryptfs_header_cache,
696 .name = "ecryptfs_headers",
Michael Halcrow237fead2006-10-04 02:16:22 -0700697 .size = PAGE_CACHE_SIZE,
698 },
699 {
Michael Halcrowdd2a3b72007-02-12 00:53:46 -0800700 .cache = &ecryptfs_xattr_cache,
701 .name = "ecryptfs_xattr_cache",
702 .size = PAGE_CACHE_SIZE,
703 },
704 {
Michael Halcroweb95e7f2007-02-16 01:28:40 -0800705 .cache = &ecryptfs_key_record_cache,
706 .name = "ecryptfs_key_record_cache",
707 .size = sizeof(struct ecryptfs_key_record),
708 },
Michael Halcrow956159c2007-10-16 01:27:55 -0700709 {
710 .cache = &ecryptfs_key_sig_cache,
711 .name = "ecryptfs_key_sig_cache",
712 .size = sizeof(struct ecryptfs_key_sig),
713 },
714 {
715 .cache = &ecryptfs_global_auth_tok_cache,
716 .name = "ecryptfs_global_auth_tok_cache",
717 .size = sizeof(struct ecryptfs_global_auth_tok),
718 },
719 {
720 .cache = &ecryptfs_key_tfm_cache,
721 .name = "ecryptfs_key_tfm_cache",
722 .size = sizeof(struct ecryptfs_key_tfm),
723 },
Michael Halcrow237fead2006-10-04 02:16:22 -0700724};
725
726static void ecryptfs_free_kmem_caches(void)
727{
728 int i;
729
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000730 /*
731 * Make sure all delayed rcu free inodes are flushed before we
732 * destroy cache.
733 */
734 rcu_barrier();
735
Michael Halcrow237fead2006-10-04 02:16:22 -0700736 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
737 struct ecryptfs_cache_info *info;
738
739 info = &ecryptfs_cache_infos[i];
740 if (*(info->cache))
741 kmem_cache_destroy(*(info->cache));
742 }
743}
744
745/**
746 * ecryptfs_init_kmem_caches
747 *
748 * Returns zero on success; non-zero otherwise
749 */
750static int ecryptfs_init_kmem_caches(void)
751{
752 int i;
753
754 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
755 struct ecryptfs_cache_info *info;
756
757 info = &ecryptfs_cache_infos[i];
758 *(info->cache) = kmem_cache_create(info->name, info->size,
Paul Mundt20c2df82007-07-20 10:11:58 +0900759 0, SLAB_HWCACHE_ALIGN, info->ctor);
Michael Halcrow237fead2006-10-04 02:16:22 -0700760 if (!*(info->cache)) {
761 ecryptfs_free_kmem_caches();
762 ecryptfs_printk(KERN_WARNING, "%s: "
763 "kmem_cache_create failed\n",
764 info->name);
765 return -ENOMEM;
766 }
767 }
768 return 0;
769}
770
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800771static struct kobject *ecryptfs_kobj;
Michael Halcrow237fead2006-10-04 02:16:22 -0700772
Kay Sievers386f2752007-11-02 13:47:53 +0100773static ssize_t version_show(struct kobject *kobj,
774 struct kobj_attribute *attr, char *buff)
Michael Halcrow237fead2006-10-04 02:16:22 -0700775{
776 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
777}
778
Kay Sievers386f2752007-11-02 13:47:53 +0100779static struct kobj_attribute version_attr = __ATTR_RO(version);
Michael Halcrow237fead2006-10-04 02:16:22 -0700780
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700781static struct attribute *attributes[] = {
782 &version_attr.attr,
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700783 NULL,
784};
785
786static struct attribute_group attr_group = {
787 .attrs = attributes,
788};
Michael Halcrow237fead2006-10-04 02:16:22 -0700789
790static int do_sysfs_registration(void)
791{
792 int rc;
793
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800794 ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
795 if (!ecryptfs_kobj) {
Greg Kroah-Hartman917e8652007-10-29 20:13:17 +0100796 printk(KERN_ERR "Unable to create ecryptfs kset\n");
797 rc = -ENOMEM;
Michael Halcrow237fead2006-10-04 02:16:22 -0700798 goto out;
799 }
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800800 rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
Michael Halcrow237fead2006-10-04 02:16:22 -0700801 if (rc) {
802 printk(KERN_ERR
Greg Kroah-Hartman30a468b2007-10-15 15:01:24 -0700803 "Unable to create ecryptfs version attributes\n");
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800804 kobject_put(ecryptfs_kobj);
Michael Halcrow237fead2006-10-04 02:16:22 -0700805 }
806out:
807 return rc;
808}
809
Ryusuke Konishia75de1b2007-08-10 13:00:56 -0700810static void do_sysfs_unregistration(void)
811{
Greg Kroah-Hartman6e90aa92007-11-06 15:08:08 -0800812 sysfs_remove_group(ecryptfs_kobj, &attr_group);
Greg Kroah-Hartman197b12d2007-12-20 08:13:05 -0800813 kobject_put(ecryptfs_kobj);
Ryusuke Konishia75de1b2007-08-10 13:00:56 -0700814}
815
Michael Halcrow237fead2006-10-04 02:16:22 -0700816static int __init ecryptfs_init(void)
817{
818 int rc;
819
820 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
821 rc = -EINVAL;
822 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
823 "larger than the host's page size, and so "
824 "eCryptfs cannot run on this system. The "
Joe Perches888d57b2010-11-10 15:46:16 -0800825 "default eCryptfs extent size is [%u] bytes; "
826 "the page size is [%lu] bytes.\n",
827 ECRYPTFS_DEFAULT_EXTENT_SIZE,
828 (unsigned long)PAGE_CACHE_SIZE);
Michael Halcrow237fead2006-10-04 02:16:22 -0700829 goto out;
830 }
831 rc = ecryptfs_init_kmem_caches();
832 if (rc) {
833 printk(KERN_ERR
834 "Failed to allocate one or more kmem_cache objects\n");
835 goto out;
836 }
Michael Halcrow237fead2006-10-04 02:16:22 -0700837 rc = do_sysfs_registration();
838 if (rc) {
839 printk(KERN_ERR "sysfs registration failed\n");
Al Viro0794f562012-03-17 21:29:13 -0400840 goto out_free_kmem_caches;
Michael Halcrow237fead2006-10-04 02:16:22 -0700841 }
Michael Halcrow746f1e52008-07-23 21:30:02 -0700842 rc = ecryptfs_init_kthread();
843 if (rc) {
844 printk(KERN_ERR "%s: kthread initialization failed; "
845 "rc = [%d]\n", __func__, rc);
846 goto out_do_sysfs_unregistration;
847 }
Tyler Hicks624ae522008-10-15 22:02:51 -0700848 rc = ecryptfs_init_messaging();
Michael Halcrowdddfa462007-02-12 00:53:44 -0800849 if (rc) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300850 printk(KERN_ERR "Failure occurred while attempting to "
Tyler Hicks624ae522008-10-15 22:02:51 -0700851 "initialize the communications channel to "
852 "ecryptfsd\n");
Michael Halcrow746f1e52008-07-23 21:30:02 -0700853 goto out_destroy_kthread;
Michael Halcrow956159c2007-10-16 01:27:55 -0700854 }
855 rc = ecryptfs_init_crypto();
856 if (rc) {
857 printk(KERN_ERR "Failure whilst attempting to init crypto; "
858 "rc = [%d]\n", rc);
Michael Halcrowcf81f892007-10-16 01:28:07 -0700859 goto out_release_messaging;
Michael Halcrowdddfa462007-02-12 00:53:44 -0800860 }
Al Viro0794f562012-03-17 21:29:13 -0400861 rc = register_filesystem(&ecryptfs_fs_type);
862 if (rc) {
863 printk(KERN_ERR "Failed to register filesystem\n");
864 goto out_destroy_crypto;
865 }
Eric Sandeen2830bfd2008-02-06 01:38:34 -0800866 if (ecryptfs_verbosity > 0)
867 printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
868 "will be written to the syslog!\n", ecryptfs_verbosity);
869
Michael Halcrowcf81f892007-10-16 01:28:07 -0700870 goto out;
Al Viro0794f562012-03-17 21:29:13 -0400871out_destroy_crypto:
872 ecryptfs_destroy_crypto();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700873out_release_messaging:
Tyler Hicks624ae522008-10-15 22:02:51 -0700874 ecryptfs_release_messaging();
Michael Halcrow746f1e52008-07-23 21:30:02 -0700875out_destroy_kthread:
876 ecryptfs_destroy_kthread();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700877out_do_sysfs_unregistration:
878 do_sysfs_unregistration();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700879out_free_kmem_caches:
880 ecryptfs_free_kmem_caches();
Michael Halcrow237fead2006-10-04 02:16:22 -0700881out:
882 return rc;
883}
884
885static void __exit ecryptfs_exit(void)
886{
Michael Halcrowcf81f892007-10-16 01:28:07 -0700887 int rc;
888
889 rc = ecryptfs_destroy_crypto();
890 if (rc)
891 printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
892 "rc = [%d]\n", rc);
Tyler Hicks624ae522008-10-15 22:02:51 -0700893 ecryptfs_release_messaging();
Michael Halcrow746f1e52008-07-23 21:30:02 -0700894 ecryptfs_destroy_kthread();
Michael Halcrowcf81f892007-10-16 01:28:07 -0700895 do_sysfs_unregistration();
Michael Halcrow237fead2006-10-04 02:16:22 -0700896 unregister_filesystem(&ecryptfs_fs_type);
897 ecryptfs_free_kmem_caches();
898}
899
900MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
901MODULE_DESCRIPTION("eCryptfs");
902
903MODULE_LICENSE("GPL");
904
905module_init(ecryptfs_init)
906module_exit(ecryptfs_exit)