Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1 | /** |
| 2 | * eCryptfs: Linux filesystem encryption layer |
| 3 | * |
| 4 | * Copyright (C) 1997-2003 Erez Zadok |
| 5 | * Copyright (C) 2001-2003 Stony Brook University |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
| 8 | * Michael C. Thompson <mcthomps@us.ibm.com> |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 9 | * Tyler Hicks <tyhicks@ou.edu> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 10 | * |
| 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 Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 33 | #include <linux/mount.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 34 | #include <linux/pagemap.h> |
| 35 | #include <linux/key.h> |
| 36 | #include <linux/parser.h> |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 37 | #include <linux/fs_stack.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/slab.h> |
Roberto Sassu | 070baa5 | 2010-11-03 11:11:22 +0100 | [diff] [blame] | 39 | #include <linux/magic.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 40 | #include "ecryptfs_kernel.h" |
| 41 | |
| 42 | /** |
| 43 | * Module parameter that defines the ecryptfs_verbosity level. |
| 44 | */ |
| 45 | int ecryptfs_verbosity = 0; |
| 46 | |
| 47 | module_param(ecryptfs_verbosity, int, 0); |
| 48 | MODULE_PARM_DESC(ecryptfs_verbosity, |
| 49 | "Initial verbosity level (0 or 1; defaults to " |
| 50 | "0, which is Quiet)"); |
| 51 | |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 52 | /** |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 53 | * Module parameter that defines the number of message buffer elements |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 54 | */ |
| 55 | unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS; |
| 56 | |
| 57 | module_param(ecryptfs_message_buf_len, uint, 0); |
| 58 | MODULE_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 Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 63 | * for a response from ecryptfsd. The actual sleep time will be, more than |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 64 | * likely, a small amount greater than this specified value, but only less if |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 65 | * the message successfully arrives. |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 66 | */ |
| 67 | signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ; |
| 68 | |
| 69 | module_param(ecryptfs_message_wait_timeout, long, 0); |
| 70 | MODULE_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 | */ |
| 80 | unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS; |
| 81 | |
| 82 | module_param(ecryptfs_number_of_users, uint, 0); |
| 83 | MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of " |
| 84 | "concurrent users of eCryptfs"); |
| 85 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 86 | void __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 Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 99 | * ecryptfs_init_lower_file |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 100 | * @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 Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 107 | * 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 Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 110 | * |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 111 | * The lower file will be opened with read/write permissions, if |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 112 | * possible. Otherwise, it is opened read-only. |
| 113 | * |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 114 | * This function does nothing if a lower file is already |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 115 | * associated with the eCryptfs inode. |
| 116 | * |
| 117 | * Returns zero on success; non-zero otherwise |
| 118 | */ |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 119 | static int ecryptfs_init_lower_file(struct dentry *dentry, |
| 120 | struct file **lower_file) |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 121 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 122 | const struct cred *cred = current_cred(); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 123 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 124 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
| 125 | int rc; |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 126 | |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 127 | 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 Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 134 | } |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 135 | return rc; |
| 136 | } |
| 137 | |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 138 | int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode) |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 139 | { |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 140 | struct ecryptfs_inode_info *inode_info; |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 141 | int count, rc = 0; |
| 142 | |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 143 | inode_info = ecryptfs_inode_to_private(inode); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 144 | 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 | |
| 158 | void 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 Hicks | 7149f25 | 2012-09-12 18:02:46 -0700 | [diff] [blame] | 165 | filemap_write_and_wait(inode->i_mapping); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 166 | fput(inode_info->lower_file); |
| 167 | inode_info->lower_file = NULL; |
| 168 | mutex_unlock(&inode_info->lower_file_mutex); |
| 169 | } |
| 170 | } |
| 171 | |
Eric Sandeen | 2830bfd | 2008-02-06 01:38:34 -0800 | [diff] [blame] | 172 | enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, |
| 173 | ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher, |
| 174 | ecryptfs_opt_ecryptfs_key_bytes, |
Michael Halcrow | 1739895 | 2007-02-12 00:53:45 -0800 | [diff] [blame] | 175 | ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata, |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 176 | ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig, |
| 177 | ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes, |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 178 | ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only, |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 179 | ecryptfs_opt_check_dev_ruid, |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 180 | ecryptfs_opt_err }; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 181 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 182 | static const match_table_t tokens = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 183 | {ecryptfs_opt_sig, "sig=%s"}, |
| 184 | {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"}, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 185 | {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 Halcrow | 1739895 | 2007-02-12 00:53:45 -0800 | [diff] [blame] | 189 | {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"}, |
| 190 | {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"}, |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 191 | {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 Hicks | e77cc8d | 2009-04-22 04:08:46 -0500 | [diff] [blame] | 194 | {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"}, |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 195 | {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"}, |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 196 | {ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"}, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 197 | {ecryptfs_opt_err, NULL} |
| 198 | }; |
| 199 | |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 200 | static int ecryptfs_init_global_auth_toks( |
| 201 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 202 | { |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 203 | struct ecryptfs_global_auth_tok *global_auth_tok; |
Roberto Sassu | 0e1fc5e | 2011-03-21 16:00:53 +0100 | [diff] [blame] | 204 | struct ecryptfs_auth_tok *auth_tok; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 205 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 206 | |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 207 | list_for_each_entry(global_auth_tok, |
| 208 | &mount_crypt_stat->global_auth_tok_list, |
| 209 | mount_crypt_stat_list) { |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 210 | rc = ecryptfs_keyring_auth_tok_for_sig( |
Roberto Sassu | 0e1fc5e | 2011-03-21 16:00:53 +0100 | [diff] [blame] | 211 | &global_auth_tok->global_auth_tok_key, &auth_tok, |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 212 | global_auth_tok->sig); |
| 213 | if (rc) { |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 214 | 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 Sandeen | 982363c | 2008-07-23 21:30:04 -0700 | [diff] [blame] | 218 | goto out; |
Roberto Sassu | b5695d0 | 2011-03-21 16:00:55 +0100 | [diff] [blame] | 219 | } else { |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 220 | global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID; |
Roberto Sassu | b5695d0 | 2011-03-21 16:00:55 +0100 | [diff] [blame] | 221 | up_write(&(global_auth_tok->global_auth_tok_key)->sem); |
| 222 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 223 | } |
Eric Sandeen | 982363c | 2008-07-23 21:30:04 -0700 | [diff] [blame] | 224 | out: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 225 | return rc; |
| 226 | } |
| 227 | |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 228 | static 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 Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 238 | /** |
| 239 | * ecryptfs_parse_options |
| 240 | * @sb: The ecryptfs super block |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 241 | * @options: The options passed to the kernel |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 242 | * @check_ruid: set to 1 if device uid should be checked against the ruid |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 243 | * |
| 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 Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 258 | static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options, |
| 259 | uid_t *check_ruid) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 260 | { |
| 261 | char *p; |
| 262 | int rc = 0; |
| 263 | int sig_set = 0; |
| 264 | int cipher_name_set = 0; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 265 | int fn_cipher_name_set = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 266 | int cipher_key_bytes; |
| 267 | int cipher_key_bytes_set = 0; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 268 | int fn_cipher_key_bytes; |
| 269 | int fn_cipher_key_bytes_set = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 270 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 271 | &sbi->mount_crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 272 | substring_t args[MAX_OPT_ARGS]; |
| 273 | int token; |
| 274 | char *sig_src; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 275 | char *cipher_name_dst; |
| 276 | char *cipher_name_src; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 277 | char *fn_cipher_name_dst; |
| 278 | char *fn_cipher_name_src; |
| 279 | char *fnek_dst; |
| 280 | char *fnek_src; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 281 | char *cipher_key_bytes_src; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 282 | char *fn_cipher_key_bytes_src; |
Tim Sally | 5f5b331 | 2012-07-12 19:10:24 -0400 | [diff] [blame] | 283 | u8 cipher_code; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 284 | |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 285 | *check_ruid = 0; |
| 286 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 287 | if (!options) { |
| 288 | rc = -EINVAL; |
| 289 | goto out; |
| 290 | } |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 291 | ecryptfs_init_mount_crypt_stat(mount_crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 292 | 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 Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 300 | rc = ecryptfs_add_global_auth_tok(mount_crypt_stat, |
Tyler Hicks | 84814d6 | 2009-03-13 13:51:59 -0700 | [diff] [blame] | 301 | sig_src, 0); |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 302 | if (rc) { |
| 303 | printk(KERN_ERR "Error attempting to register " |
| 304 | "global sig; rc = [%d]\n", rc); |
| 305 | goto out; |
| 306 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 307 | sig_set = 1; |
| 308 | break; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 309 | 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 Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 317 | cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 318 | 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 Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 327 | 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 Halcrow | 1739895 | 2007-02-12 00:53:45 -0800 | [diff] [blame] | 333 | 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 Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 343 | 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 Hicks | 84814d6 | 2009-03-13 13:51:59 -0700 | [diff] [blame] | 352 | mount_crypt_stat->global_default_fnek_sig, |
| 353 | ECRYPTFS_AUTH_TOK_FNEK); |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 354 | 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 Hicks | e77cc8d | 2009-04-22 04:08:46 -0500 | [diff] [blame] | 384 | case ecryptfs_opt_unlink_sigs: |
| 385 | mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS; |
| 386 | break; |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 387 | case ecryptfs_opt_mount_auth_tok_only: |
| 388 | mount_crypt_stat->flags |= |
| 389 | ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY; |
| 390 | break; |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 391 | case ecryptfs_opt_check_dev_ruid: |
| 392 | *check_ruid = 1; |
| 393 | break; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 394 | case ecryptfs_opt_err: |
| 395 | default: |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 396 | printk(KERN_WARNING |
| 397 | "%s: eCryptfs: unrecognized option [%s]\n", |
| 398 | __func__, p); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 399 | } |
| 400 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 401 | if (!sig_set) { |
| 402 | rc = -EINVAL; |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 403 | ecryptfs_printk(KERN_ERR, "You must supply at least one valid " |
| 404 | "auth tok signature as a mount " |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 405 | "parameter; see the eCryptfs README\n"); |
| 406 | goto out; |
| 407 | } |
| 408 | if (!cipher_name_set) { |
Miklos Szeredi | 8f23680 | 2008-07-23 21:30:05 -0700 | [diff] [blame] | 409 | int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER); |
| 410 | |
| 411 | BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
Miklos Szeredi | 8f23680 | 2008-07-23 21:30:05 -0700 | [diff] [blame] | 412 | strcpy(mount_crypt_stat->global_default_cipher_name, |
| 413 | ECRYPTFS_DEFAULT_CIPHER); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 414 | } |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 415 | 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 Halcrow | e5d9cbd | 2006-10-30 22:07:16 -0800 | [diff] [blame] | 420 | mount_crypt_stat->global_default_cipher_key_size = 0; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 421 | 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 Sally | 5f5b331 | 2012-07-12 19:10:24 -0400 | [diff] [blame] | 425 | |
| 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 Sandeen | af440f5 | 2008-02-06 01:38:37 -0800 | [diff] [blame] | 437 | mutex_lock(&key_tfm_list_mutex); |
| 438 | if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name, |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 439 | NULL)) { |
Eric Sandeen | af440f5 | 2008-02-06 01:38:37 -0800 | [diff] [blame] | 440 | 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 Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 443 | 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 Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 454 | } |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 455 | 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 Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 474 | rc = ecryptfs_init_global_auth_toks(mount_crypt_stat); |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 475 | if (rc) |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 476 | printk(KERN_WARNING "One or more global auth toks could not " |
| 477 | "properly register; rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 478 | out: |
| 479 | return rc; |
| 480 | } |
| 481 | |
| 482 | struct kmem_cache *ecryptfs_sb_info_cache; |
Al Viro | 4403158 | 2010-05-17 00:59:46 -0400 | [diff] [blame] | 483 | static struct file_system_type ecryptfs_fs_type; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 484 | |
| 485 | /** |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 486 | * 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 Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 491 | */ |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 492 | static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags, |
| 493 | const char *dev_name, void *raw_data) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 494 | { |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 495 | 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 Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 499 | struct inode *inode; |
| 500 | struct path path; |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 501 | uid_t check_ruid; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 502 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 503 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 504 | sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL); |
| 505 | if (!sbi) { |
| 506 | rc = -ENOMEM; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 507 | goto out; |
| 508 | } |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 509 | |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 510 | rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 511 | if (rc) { |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 512 | err = "Error parsing options"; |
| 513 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 514 | } |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 515 | |
David Howells | 9249e17 | 2012-06-25 12:55:37 +0100 | [diff] [blame] | 516 | s = sget(fs_type, NULL, set_anon_super, flags, NULL); |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 517 | if (IS_ERR(s)) { |
| 518 | rc = PTR_ERR(s); |
| 519 | goto out; |
| 520 | } |
| 521 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 522 | rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 523 | if (rc) |
| 524 | goto out1; |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 525 | |
| 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 Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 532 | 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 Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame] | 547 | |
| 548 | if (check_ruid && path.dentry->d_inode->i_uid != current_uid()) { |
| 549 | rc = -EPERM; |
| 550 | printk(KERN_ERR "Mount of device (uid: %d) not owned by " |
| 551 | "requested user (uid: %d)\n", |
| 552 | path.dentry->d_inode->i_uid, current_uid()); |
| 553 | goto out_free; |
| 554 | } |
| 555 | |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 556 | ecryptfs_set_superblock_lower(s, path.dentry->d_sb); |
Tyler Hicks | 069ddcd | 2012-06-11 15:42:32 -0700 | [diff] [blame] | 557 | |
| 558 | /** |
| 559 | * Set the POSIX ACL flag based on whether they're enabled in the lower |
| 560 | * mount. Force a read-only eCryptfs mount if the lower mount is ro. |
| 561 | * Allow a ro eCryptfs mount even when the lower mount is rw. |
| 562 | */ |
| 563 | s->s_flags = flags & ~MS_POSIXACL; |
| 564 | s->s_flags |= path.dentry->d_sb->s_flags & (MS_RDONLY | MS_POSIXACL); |
| 565 | |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 566 | s->s_maxbytes = path.dentry->d_sb->s_maxbytes; |
| 567 | s->s_blocksize = path.dentry->d_sb->s_blocksize; |
Roberto Sassu | 070baa5 | 2010-11-03 11:11:22 +0100 | [diff] [blame] | 568 | s->s_magic = ECRYPTFS_SUPER_MAGIC; |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 569 | |
| 570 | inode = ecryptfs_get_inode(path.dentry->d_inode, s); |
| 571 | rc = PTR_ERR(inode); |
| 572 | if (IS_ERR(inode)) |
| 573 | goto out_free; |
| 574 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 575 | s->s_root = d_make_root(inode); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 576 | if (!s->s_root) { |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 577 | rc = -ENOMEM; |
| 578 | goto out_free; |
| 579 | } |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 580 | |
| 581 | rc = -ENOMEM; |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 582 | root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 583 | if (!root_info) |
| 584 | goto out_free; |
| 585 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 586 | /* ->kill_sb() will take care of root_info */ |
| 587 | ecryptfs_set_dentry_private(s->s_root, root_info); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 588 | ecryptfs_set_dentry_lower(s->s_root, path.dentry); |
| 589 | ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt); |
| 590 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 591 | s->s_flags |= MS_ACTIVE; |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 592 | return dget(s->s_root); |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 593 | |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 594 | out_free: |
| 595 | path_put(&path); |
| 596 | out1: |
| 597 | deactivate_locked_super(s); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 598 | out: |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 599 | if (sbi) { |
| 600 | ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat); |
| 601 | kmem_cache_free(ecryptfs_sb_info_cache, sbi); |
| 602 | } |
| 603 | printk(KERN_ERR "%s; rc = [%d]\n", err, rc); |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 604 | return ERR_PTR(rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | /** |
| 608 | * ecryptfs_kill_block_super |
| 609 | * @sb: The ecryptfs super block |
| 610 | * |
| 611 | * Used to bring the superblock down and free the private data. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 612 | */ |
| 613 | static void ecryptfs_kill_block_super(struct super_block *sb) |
| 614 | { |
Al Viro | decabd6 | 2010-03-20 22:32:26 -0400 | [diff] [blame] | 615 | struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb); |
| 616 | kill_anon_super(sb); |
| 617 | if (!sb_info) |
| 618 | return; |
| 619 | ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat); |
| 620 | bdi_destroy(&sb_info->bdi); |
| 621 | kmem_cache_free(ecryptfs_sb_info_cache, sb_info); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | static struct file_system_type ecryptfs_fs_type = { |
| 625 | .owner = THIS_MODULE, |
| 626 | .name = "ecryptfs", |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 627 | .mount = ecryptfs_mount, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 628 | .kill_sb = ecryptfs_kill_block_super, |
| 629 | .fs_flags = 0 |
| 630 | }; |
| 631 | |
| 632 | /** |
| 633 | * inode_info_init_once |
| 634 | * |
| 635 | * Initializes the ecryptfs_inode_info_cache when it is created |
| 636 | */ |
| 637 | static void |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 638 | inode_info_init_once(void *vptr) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 639 | { |
| 640 | struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr; |
| 641 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 642 | inode_init_once(&ei->vfs_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | static struct ecryptfs_cache_info { |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 646 | struct kmem_cache **cache; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 647 | const char *name; |
| 648 | size_t size; |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 649 | void (*ctor)(void *obj); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 650 | } ecryptfs_cache_infos[] = { |
| 651 | { |
| 652 | .cache = &ecryptfs_auth_tok_list_item_cache, |
| 653 | .name = "ecryptfs_auth_tok_list_item", |
| 654 | .size = sizeof(struct ecryptfs_auth_tok_list_item), |
| 655 | }, |
| 656 | { |
| 657 | .cache = &ecryptfs_file_info_cache, |
| 658 | .name = "ecryptfs_file_cache", |
| 659 | .size = sizeof(struct ecryptfs_file_info), |
| 660 | }, |
| 661 | { |
| 662 | .cache = &ecryptfs_dentry_info_cache, |
| 663 | .name = "ecryptfs_dentry_info_cache", |
| 664 | .size = sizeof(struct ecryptfs_dentry_info), |
| 665 | }, |
| 666 | { |
| 667 | .cache = &ecryptfs_inode_info_cache, |
| 668 | .name = "ecryptfs_inode_cache", |
| 669 | .size = sizeof(struct ecryptfs_inode_info), |
| 670 | .ctor = inode_info_init_once, |
| 671 | }, |
| 672 | { |
| 673 | .cache = &ecryptfs_sb_info_cache, |
| 674 | .name = "ecryptfs_sb_cache", |
| 675 | .size = sizeof(struct ecryptfs_sb_info), |
| 676 | }, |
| 677 | { |
Tyler Hicks | 3063287 | 2011-05-24 05:11:12 -0500 | [diff] [blame] | 678 | .cache = &ecryptfs_header_cache, |
| 679 | .name = "ecryptfs_headers", |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 680 | .size = PAGE_CACHE_SIZE, |
| 681 | }, |
| 682 | { |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 683 | .cache = &ecryptfs_xattr_cache, |
| 684 | .name = "ecryptfs_xattr_cache", |
| 685 | .size = PAGE_CACHE_SIZE, |
| 686 | }, |
| 687 | { |
Michael Halcrow | eb95e7f | 2007-02-16 01:28:40 -0800 | [diff] [blame] | 688 | .cache = &ecryptfs_key_record_cache, |
| 689 | .name = "ecryptfs_key_record_cache", |
| 690 | .size = sizeof(struct ecryptfs_key_record), |
| 691 | }, |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 692 | { |
| 693 | .cache = &ecryptfs_key_sig_cache, |
| 694 | .name = "ecryptfs_key_sig_cache", |
| 695 | .size = sizeof(struct ecryptfs_key_sig), |
| 696 | }, |
| 697 | { |
| 698 | .cache = &ecryptfs_global_auth_tok_cache, |
| 699 | .name = "ecryptfs_global_auth_tok_cache", |
| 700 | .size = sizeof(struct ecryptfs_global_auth_tok), |
| 701 | }, |
| 702 | { |
| 703 | .cache = &ecryptfs_key_tfm_cache, |
| 704 | .name = "ecryptfs_key_tfm_cache", |
| 705 | .size = sizeof(struct ecryptfs_key_tfm), |
| 706 | }, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 707 | }; |
| 708 | |
| 709 | static void ecryptfs_free_kmem_caches(void) |
| 710 | { |
| 711 | int i; |
| 712 | |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame^] | 713 | /* |
| 714 | * Make sure all delayed rcu free inodes are flushed before we |
| 715 | * destroy cache. |
| 716 | */ |
| 717 | rcu_barrier(); |
| 718 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 719 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { |
| 720 | struct ecryptfs_cache_info *info; |
| 721 | |
| 722 | info = &ecryptfs_cache_infos[i]; |
| 723 | if (*(info->cache)) |
| 724 | kmem_cache_destroy(*(info->cache)); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | /** |
| 729 | * ecryptfs_init_kmem_caches |
| 730 | * |
| 731 | * Returns zero on success; non-zero otherwise |
| 732 | */ |
| 733 | static int ecryptfs_init_kmem_caches(void) |
| 734 | { |
| 735 | int i; |
| 736 | |
| 737 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { |
| 738 | struct ecryptfs_cache_info *info; |
| 739 | |
| 740 | info = &ecryptfs_cache_infos[i]; |
| 741 | *(info->cache) = kmem_cache_create(info->name, info->size, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 742 | 0, SLAB_HWCACHE_ALIGN, info->ctor); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 743 | if (!*(info->cache)) { |
| 744 | ecryptfs_free_kmem_caches(); |
| 745 | ecryptfs_printk(KERN_WARNING, "%s: " |
| 746 | "kmem_cache_create failed\n", |
| 747 | info->name); |
| 748 | return -ENOMEM; |
| 749 | } |
| 750 | } |
| 751 | return 0; |
| 752 | } |
| 753 | |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 754 | static struct kobject *ecryptfs_kobj; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 755 | |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 756 | static ssize_t version_show(struct kobject *kobj, |
| 757 | struct kobj_attribute *attr, char *buff) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 758 | { |
| 759 | return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK); |
| 760 | } |
| 761 | |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 762 | static struct kobj_attribute version_attr = __ATTR_RO(version); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 763 | |
Greg Kroah-Hartman | 30a468b | 2007-10-15 15:01:24 -0700 | [diff] [blame] | 764 | static struct attribute *attributes[] = { |
| 765 | &version_attr.attr, |
Greg Kroah-Hartman | 30a468b | 2007-10-15 15:01:24 -0700 | [diff] [blame] | 766 | NULL, |
| 767 | }; |
| 768 | |
| 769 | static struct attribute_group attr_group = { |
| 770 | .attrs = attributes, |
| 771 | }; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 772 | |
| 773 | static int do_sysfs_registration(void) |
| 774 | { |
| 775 | int rc; |
| 776 | |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 777 | ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj); |
| 778 | if (!ecryptfs_kobj) { |
Greg Kroah-Hartman | 917e865 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 779 | printk(KERN_ERR "Unable to create ecryptfs kset\n"); |
| 780 | rc = -ENOMEM; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 781 | goto out; |
| 782 | } |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 783 | rc = sysfs_create_group(ecryptfs_kobj, &attr_group); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 784 | if (rc) { |
| 785 | printk(KERN_ERR |
Greg Kroah-Hartman | 30a468b | 2007-10-15 15:01:24 -0700 | [diff] [blame] | 786 | "Unable to create ecryptfs version attributes\n"); |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 787 | kobject_put(ecryptfs_kobj); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 788 | } |
| 789 | out: |
| 790 | return rc; |
| 791 | } |
| 792 | |
Ryusuke Konishi | a75de1b | 2007-08-10 13:00:56 -0700 | [diff] [blame] | 793 | static void do_sysfs_unregistration(void) |
| 794 | { |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 795 | sysfs_remove_group(ecryptfs_kobj, &attr_group); |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 796 | kobject_put(ecryptfs_kobj); |
Ryusuke Konishi | a75de1b | 2007-08-10 13:00:56 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 799 | static int __init ecryptfs_init(void) |
| 800 | { |
| 801 | int rc; |
| 802 | |
| 803 | if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) { |
| 804 | rc = -EINVAL; |
| 805 | ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is " |
| 806 | "larger than the host's page size, and so " |
| 807 | "eCryptfs cannot run on this system. The " |
Joe Perches | 888d57b | 2010-11-10 15:46:16 -0800 | [diff] [blame] | 808 | "default eCryptfs extent size is [%u] bytes; " |
| 809 | "the page size is [%lu] bytes.\n", |
| 810 | ECRYPTFS_DEFAULT_EXTENT_SIZE, |
| 811 | (unsigned long)PAGE_CACHE_SIZE); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 812 | goto out; |
| 813 | } |
| 814 | rc = ecryptfs_init_kmem_caches(); |
| 815 | if (rc) { |
| 816 | printk(KERN_ERR |
| 817 | "Failed to allocate one or more kmem_cache objects\n"); |
| 818 | goto out; |
| 819 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 820 | rc = do_sysfs_registration(); |
| 821 | if (rc) { |
| 822 | printk(KERN_ERR "sysfs registration failed\n"); |
Al Viro | 0794f56 | 2012-03-17 21:29:13 -0400 | [diff] [blame] | 823 | goto out_free_kmem_caches; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 824 | } |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 825 | rc = ecryptfs_init_kthread(); |
| 826 | if (rc) { |
| 827 | printk(KERN_ERR "%s: kthread initialization failed; " |
| 828 | "rc = [%d]\n", __func__, rc); |
| 829 | goto out_do_sysfs_unregistration; |
| 830 | } |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 831 | rc = ecryptfs_init_messaging(); |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 832 | if (rc) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 833 | printk(KERN_ERR "Failure occurred while attempting to " |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 834 | "initialize the communications channel to " |
| 835 | "ecryptfsd\n"); |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 836 | goto out_destroy_kthread; |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 837 | } |
| 838 | rc = ecryptfs_init_crypto(); |
| 839 | if (rc) { |
| 840 | printk(KERN_ERR "Failure whilst attempting to init crypto; " |
| 841 | "rc = [%d]\n", rc); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 842 | goto out_release_messaging; |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 843 | } |
Al Viro | 0794f56 | 2012-03-17 21:29:13 -0400 | [diff] [blame] | 844 | rc = register_filesystem(&ecryptfs_fs_type); |
| 845 | if (rc) { |
| 846 | printk(KERN_ERR "Failed to register filesystem\n"); |
| 847 | goto out_destroy_crypto; |
| 848 | } |
Eric Sandeen | 2830bfd | 2008-02-06 01:38:34 -0800 | [diff] [blame] | 849 | if (ecryptfs_verbosity > 0) |
| 850 | printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values " |
| 851 | "will be written to the syslog!\n", ecryptfs_verbosity); |
| 852 | |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 853 | goto out; |
Al Viro | 0794f56 | 2012-03-17 21:29:13 -0400 | [diff] [blame] | 854 | out_destroy_crypto: |
| 855 | ecryptfs_destroy_crypto(); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 856 | out_release_messaging: |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 857 | ecryptfs_release_messaging(); |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 858 | out_destroy_kthread: |
| 859 | ecryptfs_destroy_kthread(); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 860 | out_do_sysfs_unregistration: |
| 861 | do_sysfs_unregistration(); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 862 | out_free_kmem_caches: |
| 863 | ecryptfs_free_kmem_caches(); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 864 | out: |
| 865 | return rc; |
| 866 | } |
| 867 | |
| 868 | static void __exit ecryptfs_exit(void) |
| 869 | { |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 870 | int rc; |
| 871 | |
| 872 | rc = ecryptfs_destroy_crypto(); |
| 873 | if (rc) |
| 874 | printk(KERN_ERR "Failure whilst attempting to destroy crypto; " |
| 875 | "rc = [%d]\n", rc); |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 876 | ecryptfs_release_messaging(); |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 877 | ecryptfs_destroy_kthread(); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 878 | do_sysfs_unregistration(); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 879 | unregister_filesystem(&ecryptfs_fs_type); |
| 880 | ecryptfs_free_kmem_caches(); |
| 881 | } |
| 882 | |
| 883 | MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>"); |
| 884 | MODULE_DESCRIPTION("eCryptfs"); |
| 885 | |
| 886 | MODULE_LICENSE("GPL"); |
| 887 | |
| 888 | module_init(ecryptfs_init) |
| 889 | module_exit(ecryptfs_exit) |