1a59d1b8e05ea (Thomas Gleixner 2019-05-27 08:55:05 +0200 1) // SPDX-License-Identifier: GPL-2.0-or-later
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 2) /*
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 3) * eCryptfs: Linux filesystem encryption layer
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 4) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 5) * Copyright (C) 1997-2003 Erez Zadok
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 6) * Copyright (C) 2001-2003 Stony Brook University
dd2a3b7ad98f8 (Michael Halcrow 2007-02-12 00:53:46 -0800 7) * Copyright (C) 2004-2007 International Business Machines Corp.
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 8) * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 9) * Michael C. Thompson <mcthomps@us.ibm.com>
f8e48a8408f5e (Tyler Hicks 2020-02-13 21:25:54 +0000 10) * Tyler Hicks <code@tyhicks.com>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 11) */
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 12)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 13) #include <linux/dcache.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 14) #include <linux/file.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 15) #include <linux/module.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 16) #include <linux/namei.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 17) #include <linux/skbuff.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 18) #include <linux/mount.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 19) #include <linux/pagemap.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 20) #include <linux/key.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 21) #include <linux/parser.h>
0cc72dc7f0501 (Josef "Jeff" Sipek 2006-12-08 02:36:31 -0800 22) #include <linux/fs_stack.h>
5a0e3ad6af866 (Tejun Heo 2010-03-24 17:04:11 +0900 23) #include <linux/slab.h>
070baa51286e5 (Roberto Sassu 2010-11-03 11:11:22 +0100 24) #include <linux/magic.h>
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 25) #include "ecryptfs_kernel.h"
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 26)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 27) /*
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 28) * Module parameter that defines the ecryptfs_verbosity level.
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 29) */
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 30) int ecryptfs_verbosity = 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 31)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 32) module_param(ecryptfs_verbosity, int, 0);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 33) MODULE_PARM_DESC(ecryptfs_verbosity,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 34) "Initial verbosity level (0 or 1; defaults to "
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 35) "0, which is Quiet)");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 36)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 37) /*
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 38) * Module parameter that defines the number of message buffer elements
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 39) */
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 40) unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 41)
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 42) module_param(ecryptfs_message_buf_len, uint, 0);
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 43) MODULE_PARM_DESC(ecryptfs_message_buf_len,
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 44) "Number of message buffer elements");
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 45)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 46) /*
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 47) * Module parameter that defines the maximum guaranteed amount of time to wait
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 48) * for a response from ecryptfsd. The actual sleep time will be, more than
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 49) * likely, a small amount greater than this specified value, but only less if
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 50) * the message successfully arrives.
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 51) */
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 52) signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 53)
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 54) module_param(ecryptfs_message_wait_timeout, long, 0);
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 55) MODULE_PARM_DESC(ecryptfs_message_wait_timeout,
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 56) "Maximum number of seconds that an operation will "
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 57) "sleep while waiting for a message response from "
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 58) "userspace");
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 59)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 60) /*
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 61) * Module parameter that is an estimate of the maximum number of users
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 62) * that will be concurrently using eCryptfs. Set this to the right
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 63) * value to balance performance and memory use.
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 64) */
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 65) unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS;
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 66)
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 67) module_param(ecryptfs_number_of_users, uint, 0);
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 68) MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 69) "concurrent users of eCryptfs");
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 70)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 71) void __ecryptfs_printk(const char *fmt, ...)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 72) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 73) va_list args;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 74) va_start(args, fmt);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 75) if (fmt[1] == '7') { /* KERN_DEBUG */
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 76) if (ecryptfs_verbosity >= 1)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 77) vprintk(fmt, args);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 78) } else
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 79) vprintk(fmt, args);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 80) va_end(args);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 81) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 82)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 83) /*
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 84) * ecryptfs_init_lower_file
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 85) * @ecryptfs_dentry: Fully initialized eCryptfs dentry object, with
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 86) * the lower dentry and the lower mount set
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 87) *
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 88) * eCryptfs only ever keeps a single open file for every lower
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 89) * inode. All I/O operations to the lower inode occur through that
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 90) * file. When the first eCryptfs dentry that interposes with the first
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 91) * lower dentry for that inode is created, this function creates the
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 92) * lower file struct and associates it with the eCryptfs
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 93) * inode. When all eCryptfs files associated with the inode are released, the
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 94) * file is closed.
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 95) *
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 96) * The lower file will be opened with read/write permissions, if
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 97) * possible. Otherwise, it is opened read-only.
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 98) *
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 99) * This function does nothing if a lower file is already
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 100) * associated with the eCryptfs inode.
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 101) *
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 102) * Returns zero on success; non-zero otherwise
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 103) */
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 104) static int ecryptfs_init_lower_file(struct dentry *dentry,
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 105) struct file **lower_file)
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 106) {
745ca2475a6ac (David Howells 2008-11-14 10:39:22 +1100 107) const struct cred *cred = current_cred();
cc18ec3c8f5dd (Matthew Wilcox 2013-06-15 07:55:59 -0400 108) struct path *path = ecryptfs_dentry_to_lower_path(dentry);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 109) int rc;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 110)
cc18ec3c8f5dd (Matthew Wilcox 2013-06-15 07:55:59 -0400 111) rc = ecryptfs_privileged_open(lower_file, path->dentry, path->mnt,
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 112) cred);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 113) if (rc) {
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 114) printk(KERN_ERR "Error opening lower file "
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 115) "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
cc18ec3c8f5dd (Matthew Wilcox 2013-06-15 07:55:59 -0400 116) "rc = [%d]\n", path->dentry, path->mnt, rc);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 117) (*lower_file) = NULL;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 118) }
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 119) return rc;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 120) }
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 121)
3b06b3ebf4417 (Tyler Hicks 2011-05-24 03:49:02 -0500 122) int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 123) {
3b06b3ebf4417 (Tyler Hicks 2011-05-24 03:49:02 -0500 124) struct ecryptfs_inode_info *inode_info;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 125) int count, rc = 0;
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 126)
3b06b3ebf4417 (Tyler Hicks 2011-05-24 03:49:02 -0500 127) inode_info = ecryptfs_inode_to_private(inode);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 128) mutex_lock(&inode_info->lower_file_mutex);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 129) count = atomic_inc_return(&inode_info->lower_file_count);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 130) if (WARN_ON_ONCE(count < 1))
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 131) rc = -EINVAL;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 132) else if (count == 1) {
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 133) rc = ecryptfs_init_lower_file(dentry,
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 134) &inode_info->lower_file);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 135) if (rc)
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 136) atomic_set(&inode_info->lower_file_count, 0);
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 137) }
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 138) mutex_unlock(&inode_info->lower_file_mutex);
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 139) return rc;
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 140) }
4981e081cfe2c (Michael Halcrow 2007-10-16 01:28:09 -0700 141)
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 142) void ecryptfs_put_lower_file(struct inode *inode)
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 143) {
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 144) struct ecryptfs_inode_info *inode_info;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 145)
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 146) inode_info = ecryptfs_inode_to_private(inode);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 147) if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count,
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 148) &inode_info->lower_file_mutex)) {
7149f2558d5b5 (Tyler Hicks 2012-09-12 18:02:46 -0700 149) filemap_write_and_wait(inode->i_mapping);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 150) fput(inode_info->lower_file);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 151) inode_info->lower_file = NULL;
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 152) mutex_unlock(&inode_info->lower_file_mutex);
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 153) }
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 154) }
332ab16f830f5 (Tyler Hicks 2011-04-14 15:35:11 -0500 155)
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 156) enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 157) ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 158) ecryptfs_opt_ecryptfs_key_bytes,
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 159) ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 160) ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 161) ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 162) ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 163) ecryptfs_opt_check_dev_ruid,
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 164) ecryptfs_opt_err };
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 165)
a447c0932445f (Steven Whitehouse 2008-10-13 10:46:57 +0100 166) static const match_table_t tokens = {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 167) {ecryptfs_opt_sig, "sig=%s"},
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 168) {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 169) {ecryptfs_opt_cipher, "cipher=%s"},
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 170) {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 171) {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 172) {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 173) {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 174) {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 175) {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 176) {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 177) {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
e77cc8d243f9f (Tyler Hicks 2009-04-22 04:08:46 -0500 178) {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 179) {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 180) {ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"},
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 181) {ecryptfs_opt_err, NULL}
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 182) };
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 183)
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 184) static int ecryptfs_init_global_auth_toks(
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 185) struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 186) {
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 187) struct ecryptfs_global_auth_tok *global_auth_tok;
0e1fc5ef470cc (Roberto Sassu 2011-03-21 16:00:53 +0100 188) struct ecryptfs_auth_tok *auth_tok;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 189) int rc = 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 190)
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 191) list_for_each_entry(global_auth_tok,
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 192) &mount_crypt_stat->global_auth_tok_list,
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 193) mount_crypt_stat_list) {
5dda6992a3138 (Michael Halcrow 2007-10-16 01:28:06 -0700 194) rc = ecryptfs_keyring_auth_tok_for_sig(
0e1fc5ef470cc (Roberto Sassu 2011-03-21 16:00:53 +0100 195) &global_auth_tok->global_auth_tok_key, &auth_tok,
5dda6992a3138 (Michael Halcrow 2007-10-16 01:28:06 -0700 196) global_auth_tok->sig);
5dda6992a3138 (Michael Halcrow 2007-10-16 01:28:06 -0700 197) if (rc) {
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 198) printk(KERN_ERR "Could not find valid key in user "
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 199) "session keyring for sig specified in mount "
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 200) "option: [%s]\n", global_auth_tok->sig);
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 201) global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
982363c97f8ca (Eric Sandeen 2008-07-23 21:30:04 -0700 202) goto out;
b5695d04634fa (Roberto Sassu 2011-03-21 16:00:55 +0100 203) } else {
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 204) global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
b5695d04634fa (Roberto Sassu 2011-03-21 16:00:55 +0100 205) up_write(&(global_auth_tok->global_auth_tok_key)->sem);
b5695d04634fa (Roberto Sassu 2011-03-21 16:00:55 +0100 206) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 207) }
982363c97f8ca (Eric Sandeen 2008-07-23 21:30:04 -0700 208) out:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 209) return rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 210) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 211)
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 212) static void ecryptfs_init_mount_crypt_stat(
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 213) struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 214) {
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 215) memset((void *)mount_crypt_stat, 0,
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 216) sizeof(struct ecryptfs_mount_crypt_stat));
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 217) INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 218) mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 219) mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 220) }
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 221)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 222) /**
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 223) * ecryptfs_parse_options
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 224) * @sbi: The ecryptfs super block
25985edcedea6 (Lucas De Marchi 2011-03-30 22:57:33 -0300 225) * @options: The options passed to the kernel
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 226) * @check_ruid: set to 1 if device uid should be checked against the ruid
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 227) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 228) * Parse mount options:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 229) * debug=N - ecryptfs_verbosity level for debug output
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 230) * sig=XXX - description(signature) of the key to use
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 231) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 232) * Returns the dentry object of the lower-level (lower/interposed)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 233) * directory; We want to mount our stackable file system on top of
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 234) * that lower directory.
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 235) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 236) * The signature of the key to use must be the description of a key
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 237) * already in the keyring. Mounting will fail if the key can not be
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 238) * found.
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 239) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 240) * Returns zero on success; non-zero on error
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 241) */
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 242) static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 243) uid_t *check_ruid)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 244) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 245) char *p;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 246) int rc = 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 247) int sig_set = 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 248) int cipher_name_set = 0;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 249) int fn_cipher_name_set = 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 250) int cipher_key_bytes;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 251) int cipher_key_bytes_set = 0;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 252) int fn_cipher_key_bytes;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 253) int fn_cipher_key_bytes_set = 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 254) struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 255) &sbi->mount_crypt_stat;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 256) substring_t args[MAX_OPT_ARGS];
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 257) int token;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 258) char *sig_src;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 259) char *cipher_name_dst;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 260) char *cipher_name_src;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 261) char *fn_cipher_name_dst;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 262) char *fn_cipher_name_src;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 263) char *fnek_dst;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 264) char *fnek_src;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 265) char *cipher_key_bytes_src;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 266) char *fn_cipher_key_bytes_src;
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 267) u8 cipher_code;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 268)
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 269) *check_ruid = 0;
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 270)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 271) if (!options) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 272) rc = -EINVAL;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 273) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 274) }
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 275) ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 276) while ((p = strsep(&options, ",")) != NULL) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 277) if (!*p)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 278) continue;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 279) token = match_token(p, tokens, args);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 280) switch (token) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 281) case ecryptfs_opt_sig:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 282) case ecryptfs_opt_ecryptfs_sig:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 283) sig_src = args[0].from;
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 284) rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
84814d642a4f1 (Tyler Hicks 2009-03-13 13:51:59 -0700 285) sig_src, 0);
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 286) if (rc) {
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 287) printk(KERN_ERR "Error attempting to register "
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 288) "global sig; rc = [%d]\n", rc);
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 289) goto out;
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 290) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 291) sig_set = 1;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 292) break;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 293) case ecryptfs_opt_cipher:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 294) case ecryptfs_opt_ecryptfs_cipher:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 295) cipher_name_src = args[0].from;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 296) cipher_name_dst =
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 297) mount_crypt_stat->
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 298) global_default_cipher_name;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 299) strncpy(cipher_name_dst, cipher_name_src,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 300) ECRYPTFS_MAX_CIPHER_NAME_SIZE);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 301) cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 302) cipher_name_set = 1;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 303) break;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 304) case ecryptfs_opt_ecryptfs_key_bytes:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 305) cipher_key_bytes_src = args[0].from;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 306) cipher_key_bytes =
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 307) (int)simple_strtol(cipher_key_bytes_src,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 308) &cipher_key_bytes_src, 0);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 309) mount_crypt_stat->global_default_cipher_key_size =
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 310) cipher_key_bytes;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 311) cipher_key_bytes_set = 1;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 312) break;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 313) case ecryptfs_opt_passthrough:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 314) mount_crypt_stat->flags |=
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 315) ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 316) break;
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 317) case ecryptfs_opt_xattr_metadata:
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 318) mount_crypt_stat->flags |=
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 319) ECRYPTFS_XATTR_METADATA_ENABLED;
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 320) break;
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 321) case ecryptfs_opt_encrypted_view:
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 322) mount_crypt_stat->flags |=
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 323) ECRYPTFS_XATTR_METADATA_ENABLED;
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 324) mount_crypt_stat->flags |=
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 325) ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
17398957aa0a0 (Michael Halcrow 2007-02-12 00:53:45 -0800 326) break;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 327) case ecryptfs_opt_fnek_sig:
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 328) fnek_src = args[0].from;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 329) fnek_dst =
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 330) mount_crypt_stat->global_default_fnek_sig;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 331) strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 332) mount_crypt_stat->global_default_fnek_sig[
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 333) ECRYPTFS_SIG_SIZE_HEX] = '\0';
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 334) rc = ecryptfs_add_global_auth_tok(
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 335) mount_crypt_stat,
84814d642a4f1 (Tyler Hicks 2009-03-13 13:51:59 -0700 336) mount_crypt_stat->global_default_fnek_sig,
84814d642a4f1 (Tyler Hicks 2009-03-13 13:51:59 -0700 337) ECRYPTFS_AUTH_TOK_FNEK);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 338) if (rc) {
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 339) printk(KERN_ERR "Error attempting to register "
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 340) "global fnek sig [%s]; rc = [%d]\n",
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 341) mount_crypt_stat->global_default_fnek_sig,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 342) rc);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 343) goto out;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 344) }
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 345) mount_crypt_stat->flags |=
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 346) (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 347) | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 348) break;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 349) case ecryptfs_opt_fn_cipher:
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 350) fn_cipher_name_src = args[0].from;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 351) fn_cipher_name_dst =
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 352) mount_crypt_stat->global_default_fn_cipher_name;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 353) strncpy(fn_cipher_name_dst, fn_cipher_name_src,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 354) ECRYPTFS_MAX_CIPHER_NAME_SIZE);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 355) mount_crypt_stat->global_default_fn_cipher_name[
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 356) ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 357) fn_cipher_name_set = 1;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 358) break;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 359) case ecryptfs_opt_fn_cipher_key_bytes:
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 360) fn_cipher_key_bytes_src = args[0].from;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 361) fn_cipher_key_bytes =
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 362) (int)simple_strtol(fn_cipher_key_bytes_src,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 363) &fn_cipher_key_bytes_src, 0);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 364) mount_crypt_stat->global_default_fn_cipher_key_bytes =
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 365) fn_cipher_key_bytes;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 366) fn_cipher_key_bytes_set = 1;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 367) break;
e77cc8d243f9f (Tyler Hicks 2009-04-22 04:08:46 -0500 368) case ecryptfs_opt_unlink_sigs:
e77cc8d243f9f (Tyler Hicks 2009-04-22 04:08:46 -0500 369) mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
e77cc8d243f9f (Tyler Hicks 2009-04-22 04:08:46 -0500 370) break;
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 371) case ecryptfs_opt_mount_auth_tok_only:
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 372) mount_crypt_stat->flags |=
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 373) ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
f16feb5119a87 (Roberto Sassu 2010-10-06 18:31:32 +0200 374) break;
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 375) case ecryptfs_opt_check_dev_ruid:
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 376) *check_ruid = 1;
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 377) break;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 378) case ecryptfs_opt_err:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 379) default:
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 380) printk(KERN_WARNING
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 381) "%s: eCryptfs: unrecognized option [%s]\n",
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 382) __func__, p);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 383) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 384) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 385) if (!sig_set) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 386) rc = -EINVAL;
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 387) ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 388) "auth tok signature as a mount "
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 389) "parameter; see the eCryptfs README\n");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 390) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 391) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 392) if (!cipher_name_set) {
8f2368095e250 (Miklos Szeredi 2008-07-23 21:30:05 -0700 393) int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
8f2368095e250 (Miklos Szeredi 2008-07-23 21:30:05 -0700 394)
2a559a8bdeae8 (Colin Ian King 2015-02-23 11:34:10 +0000 395) BUG_ON(cipher_name_len > ECRYPTFS_MAX_CIPHER_NAME_SIZE);
8f2368095e250 (Miklos Szeredi 2008-07-23 21:30:05 -0700 396) strcpy(mount_crypt_stat->global_default_cipher_name,
8f2368095e250 (Miklos Szeredi 2008-07-23 21:30:05 -0700 397) ECRYPTFS_DEFAULT_CIPHER);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 398) }
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 399) if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 400) && !fn_cipher_name_set)
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 401) strcpy(mount_crypt_stat->global_default_fn_cipher_name,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 402) mount_crypt_stat->global_default_cipher_name);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 403) if (!cipher_key_bytes_set)
e5d9cbde6ce00 (Michael Halcrow 2006-10-30 22:07:16 -0800 404) mount_crypt_stat->global_default_cipher_key_size = 0;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 405) if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 406) && !fn_cipher_key_bytes_set)
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 407) mount_crypt_stat->global_default_fn_cipher_key_bytes =
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 408) mount_crypt_stat->global_default_cipher_key_size;
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 409)
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 410) cipher_code = ecryptfs_code_for_cipher_string(
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 411) mount_crypt_stat->global_default_cipher_name,
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 412) mount_crypt_stat->global_default_cipher_key_size);
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 413) if (!cipher_code) {
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 414) ecryptfs_printk(KERN_ERR,
0996b67df6c13 (Colin Ian King 2016-09-27 05:18:02 -0700 415) "eCryptfs doesn't support cipher: %s\n",
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 416) mount_crypt_stat->global_default_cipher_name);
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 417) rc = -EINVAL;
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 418) goto out;
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 419) }
5f5b331d5c212 (Tim Sally 2012-07-12 19:10:24 -0400 420)
af440f52927e4 (Eric Sandeen 2008-02-06 01:38:37 -0800 421) mutex_lock(&key_tfm_list_mutex);
af440f52927e4 (Eric Sandeen 2008-02-06 01:38:37 -0800 422) if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 423) NULL)) {
af440f52927e4 (Eric Sandeen 2008-02-06 01:38:37 -0800 424) rc = ecryptfs_add_new_key_tfm(
af440f52927e4 (Eric Sandeen 2008-02-06 01:38:37 -0800 425) NULL, mount_crypt_stat->global_default_cipher_name,
af440f52927e4 (Eric Sandeen 2008-02-06 01:38:37 -0800 426) mount_crypt_stat->global_default_cipher_key_size);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 427) if (rc) {
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 428) printk(KERN_ERR "Error attempting to initialize "
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 429) "cipher with name = [%s] and key size = [%td]; "
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 430) "rc = [%d]\n",
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 431) mount_crypt_stat->global_default_cipher_name,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 432) mount_crypt_stat->global_default_cipher_key_size,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 433) rc);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 434) rc = -EINVAL;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 435) mutex_unlock(&key_tfm_list_mutex);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 436) goto out;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 437) }
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 438) }
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 439) if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 440) && !ecryptfs_tfm_exists(
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 441) mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 442) rc = ecryptfs_add_new_key_tfm(
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 443) NULL, mount_crypt_stat->global_default_fn_cipher_name,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 444) mount_crypt_stat->global_default_fn_cipher_key_bytes);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 445) if (rc) {
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 446) printk(KERN_ERR "Error attempting to initialize "
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 447) "cipher with name = [%s] and key size = [%td]; "
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 448) "rc = [%d]\n",
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 449) mount_crypt_stat->global_default_fn_cipher_name,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 450) mount_crypt_stat->global_default_fn_cipher_key_bytes,
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 451) rc);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 452) rc = -EINVAL;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 453) mutex_unlock(&key_tfm_list_mutex);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 454) goto out;
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 455) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 456) }
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 457) mutex_unlock(&key_tfm_list_mutex);
5dda6992a3138 (Michael Halcrow 2007-10-16 01:28:06 -0700 458) rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
87c94c4df0149 (Michael Halcrow 2009-01-06 14:42:01 -0800 459) if (rc)
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 460) printk(KERN_WARNING "One or more global auth toks could not "
f4aad16adfb8f (Michael Halcrow 2007-10-16 01:27:53 -0700 461) "properly register; rc = [%d]\n", rc);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 462) out:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 463) return rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 464) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 465)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 466) struct kmem_cache *ecryptfs_sb_info_cache;
4403158ba295c (Al Viro 2010-05-17 00:59:46 -0400 467) static struct file_system_type ecryptfs_fs_type;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 468)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 469) /*
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 470) * ecryptfs_mount
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 471) * @fs_type: The filesystem type that the superblock should belong to
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 472) * @flags: The flags associated with the mount
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 473) * @dev_name: The path to mount over
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 474) * @raw_data: The options passed into the kernel
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 475) */
4d143beb0429e (Al Viro 2010-07-26 13:33:36 +0400 476) static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
4d143beb0429e (Al Viro 2010-07-26 13:33:36 +0400 477) const char *dev_name, void *raw_data)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 478) {
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 479) struct super_block *s;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 480) struct ecryptfs_sb_info *sbi;
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 481) struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 482) struct ecryptfs_dentry_info *root_info;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 483) const char *err = "Getting sb failed";
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 484) struct inode *inode;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 485) struct path path;
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 486) uid_t check_ruid;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 487) int rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 488)
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 489) sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 490) if (!sbi) {
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 491) rc = -ENOMEM;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 492) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 493) }
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 494)
9046625511ad8 (Jeffrey Mitchell 2021-02-26 15:00:23 -0600 495) if (!dev_name) {
9046625511ad8 (Jeffrey Mitchell 2021-02-26 15:00:23 -0600 496) rc = -EINVAL;
9046625511ad8 (Jeffrey Mitchell 2021-02-26 15:00:23 -0600 497) err = "Device name cannot be null";
9046625511ad8 (Jeffrey Mitchell 2021-02-26 15:00:23 -0600 498) goto out;
9046625511ad8 (Jeffrey Mitchell 2021-02-26 15:00:23 -0600 499) }
9046625511ad8 (Jeffrey Mitchell 2021-02-26 15:00:23 -0600 500)
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 501) rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 502) if (rc) {
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 503) err = "Error parsing options";
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 504) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 505) }
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 506) mount_crypt_stat = &sbi->mount_crypt_stat;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 507)
9249e17fe094d (David Howells 2012-06-25 12:55:37 +0100 508) s = sget(fs_type, NULL, set_anon_super, flags, NULL);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 509) if (IS_ERR(s)) {
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 510) rc = PTR_ERR(s);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 511) goto out;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 512) }
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 513)
e836818bd9ec5 (Jan Kara 2017-04-12 12:24:35 +0200 514) rc = super_setup_bdi(s);
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 515) if (rc)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 516) goto out1;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 517)
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 518) ecryptfs_set_superblock_private(s, sbi);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 519)
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 520) /* ->kill_sb() will take care of sbi after that point */
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 521) sbi = NULL;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 522) s->s_op = &ecryptfs_sops;
4b899da50dcf1 (Andreas Gruenbacher 2016-09-29 17:48:36 +0200 523) s->s_xattr = ecryptfs_xattr_handlers;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 524) s->s_d_op = &ecryptfs_dops;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 525)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 526) err = "Reading sb failed";
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 527) rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 528) if (rc) {
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 529) ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 530) goto out1;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 531) }
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 532) if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 533) rc = -EINVAL;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 534) printk(KERN_ERR "Mount on filesystem of type "
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 535) "eCryptfs explicitly disallowed due to "
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 536) "known incompatibilities\n");
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 537) goto out_free;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 538) }
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 539)
0f16ff0f545d5 (Christian Brauner 2021-01-21 14:19:46 +0100 540) if (mnt_user_ns(path.mnt) != &init_user_ns) {
0f16ff0f545d5 (Christian Brauner 2021-01-21 14:19:46 +0100 541) rc = -EINVAL;
0f16ff0f545d5 (Christian Brauner 2021-01-21 14:19:46 +0100 542) printk(KERN_ERR "Mounting on idmapped mounts currently disallowed\n");
0f16ff0f545d5 (Christian Brauner 2021-01-21 14:19:46 +0100 543) goto out_free;
0f16ff0f545d5 (Christian Brauner 2021-01-21 14:19:46 +0100 544) }
0f16ff0f545d5 (Christian Brauner 2021-01-21 14:19:46 +0100 545)
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 546) if (check_ruid && !uid_eq(d_inode(path.dentry)->i_uid, current_uid())) {
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 547) rc = -EPERM;
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 548) printk(KERN_ERR "Mount of device (uid: %d) not owned by "
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 549) "requested user (uid: %d)\n",
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 550) i_uid_read(d_inode(path.dentry)),
cdf8c58a35464 (Eric W. Biederman 2012-02-07 16:24:33 -0800 551) from_kuid(&init_user_ns, current_uid()));
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 552) goto out_free;
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 553) }
764355487ea22 (John Johansen 2011-07-22 08:14:15 -0700 554)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 555) ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
069ddcda37b2c (Tyler Hicks 2012-06-11 15:42:32 -0700 556)
069ddcda37b2c (Tyler Hicks 2012-06-11 15:42:32 -0700 557) /**
069ddcda37b2c (Tyler Hicks 2012-06-11 15:42:32 -0700 558) * Set the POSIX ACL flag based on whether they're enabled in the lower
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 559) * mount.
069ddcda37b2c (Tyler Hicks 2012-06-11 15:42:32 -0700 560) */
1751e8a6cb935 (Linus Torvalds 2017-11-27 13:05:09 -0800 561) s->s_flags = flags & ~SB_POSIXACL;
1751e8a6cb935 (Linus Torvalds 2017-11-27 13:05:09 -0800 562) s->s_flags |= path.dentry->d_sb->s_flags & SB_POSIXACL;
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 563)
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 564) /**
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 565) * Force a read-only eCryptfs mount when:
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 566) * 1) The lower mount is ro
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 567) * 2) The ecryptfs_encrypted_view mount option is specified
332b122d39c9c (Tyler Hicks 2014-10-07 15:51:55 -0500 568) */
bc98a42c1f7d0 (David Howells 2017-07-17 08:45:34 +0100 569) if (sb_rdonly(path.dentry->d_sb) || mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
1751e8a6cb935 (Linus Torvalds 2017-11-27 13:05:09 -0800 570) s->s_flags |= SB_RDONLY;
069ddcda37b2c (Tyler Hicks 2012-06-11 15:42:32 -0700 571)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 572) s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 573) s->s_blocksize = path.dentry->d_sb->s_blocksize;
070baa51286e5 (Roberto Sassu 2010-11-03 11:11:22 +0100 574) s->s_magic = ECRYPTFS_SUPER_MAGIC;
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 575) s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 576)
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 577) rc = -EINVAL;
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 578) if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 579) pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 580) goto out_free;
69c433ed2ecd2 (Miklos Szeredi 2014-10-24 00:14:39 +0200 581) }
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 582)
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 583) inode = ecryptfs_get_inode(d_inode(path.dentry), s);
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 584) rc = PTR_ERR(inode);
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 585) if (IS_ERR(inode))
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 586) goto out_free;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 587)
48fde701aff66 (Al Viro 2012-01-08 22:15:13 -0500 588) s->s_root = d_make_root(inode);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 589) if (!s->s_root) {
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 590) rc = -ENOMEM;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 591) goto out_free;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 592) }
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 593)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 594) rc = -ENOMEM;
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 595) root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 596) if (!root_info)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 597) goto out_free;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 598)
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 599) /* ->kill_sb() will take care of root_info */
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 600) ecryptfs_set_dentry_private(s->s_root, root_info);
92dd123033d50 (Al Viro 2013-09-15 20:50:13 -0400 601) root_info->lower_path = path;
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 602)
1751e8a6cb935 (Linus Torvalds 2017-11-27 13:05:09 -0800 603) s->s_flags |= SB_ACTIVE;
4d143beb0429e (Al Viro 2010-07-26 13:33:36 +0400 604) return dget(s->s_root);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 605)
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 606) out_free:
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 607) path_put(&path);
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 608) out1:
66cb76666d695 (Al Viro 2011-01-12 20:04:37 -0500 609) deactivate_locked_super(s);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 610) out:
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 611) if (sbi) {
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 612) ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 613) kmem_cache_free(ecryptfs_sb_info_cache, sbi);
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 614) }
2ccde7c631f99 (Al Viro 2010-03-21 12:24:29 -0400 615) printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
4d143beb0429e (Al Viro 2010-07-26 13:33:36 +0400 616) return ERR_PTR(rc);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 617) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 618)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 619) /**
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 620) * ecryptfs_kill_block_super
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 621) * @sb: The ecryptfs super block
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 622) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 623) * Used to bring the superblock down and free the private data.
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 624) */
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 625) static void ecryptfs_kill_block_super(struct super_block *sb)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 626) {
decabd6650915 (Al Viro 2010-03-20 22:32:26 -0400 627) struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
decabd6650915 (Al Viro 2010-03-20 22:32:26 -0400 628) kill_anon_super(sb);
decabd6650915 (Al Viro 2010-03-20 22:32:26 -0400 629) if (!sb_info)
decabd6650915 (Al Viro 2010-03-20 22:32:26 -0400 630) return;
decabd6650915 (Al Viro 2010-03-20 22:32:26 -0400 631) ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
decabd6650915 (Al Viro 2010-03-20 22:32:26 -0400 632) kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 633) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 634)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 635) static struct file_system_type ecryptfs_fs_type = {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 636) .owner = THIS_MODULE,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 637) .name = "ecryptfs",
4d143beb0429e (Al Viro 2010-07-26 13:33:36 +0400 638) .mount = ecryptfs_mount,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 639) .kill_sb = ecryptfs_kill_block_super,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 640) .fs_flags = 0
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 641) };
7f78e03513940 (Eric W. Biederman 2013-03-02 19:39:14 -0800 642) MODULE_ALIAS_FS("ecryptfs");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 643)
e24012062e3df (Lee Jones 2021-03-30 17:44:53 +0100 644) /*
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 645) * inode_info_init_once
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 646) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 647) * Initializes the ecryptfs_inode_info_cache when it is created
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 648) */
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 649) static void
51cc50685a427 (Alexey Dobriyan 2008-07-25 19:45:34 -0700 650) inode_info_init_once(void *vptr)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 651) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 652) struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 653)
a35afb830f8d7 (Christoph Lameter 2007-05-16 22:10:57 -0700 654) inode_init_once(&ei->vfs_inode);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 655) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 656)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 657) static struct ecryptfs_cache_info {
e18b890bb0881 (Christoph Lameter 2006-12-06 20:33:20 -0800 658) struct kmem_cache **cache;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 659) const char *name;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 660) size_t size;
d50112edde1d0 (Alexey Dobriyan 2017-11-15 17:32:18 -0800 661) slab_flags_t flags;
51cc50685a427 (Alexey Dobriyan 2008-07-25 19:45:34 -0700 662) void (*ctor)(void *obj);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 663) } ecryptfs_cache_infos[] = {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 664) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 665) .cache = &ecryptfs_auth_tok_list_item_cache,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 666) .name = "ecryptfs_auth_tok_list_item",
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 667) .size = sizeof(struct ecryptfs_auth_tok_list_item),
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 668) },
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 669) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 670) .cache = &ecryptfs_file_info_cache,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 671) .name = "ecryptfs_file_cache",
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 672) .size = sizeof(struct ecryptfs_file_info),
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 673) },
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 674) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 675) .cache = &ecryptfs_dentry_info_cache,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 676) .name = "ecryptfs_dentry_info_cache",
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 677) .size = sizeof(struct ecryptfs_dentry_info),
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 678) },
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 679) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 680) .cache = &ecryptfs_inode_info_cache,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 681) .name = "ecryptfs_inode_cache",
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 682) .size = sizeof(struct ecryptfs_inode_info),
5d097056c9a01 (Vladimir Davydov 2016-01-14 15:18:21 -0800 683) .flags = SLAB_ACCOUNT,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 684) .ctor = inode_info_init_once,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 685) },
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 686) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 687) .cache = &ecryptfs_sb_info_cache,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 688) .name = "ecryptfs_sb_cache",
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 689) .size = sizeof(struct ecryptfs_sb_info),
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 690) },
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 691) {
3063287053bca (Tyler Hicks 2011-05-24 05:11:12 -0500 692) .cache = &ecryptfs_header_cache,
3063287053bca (Tyler Hicks 2011-05-24 05:11:12 -0500 693) .name = "ecryptfs_headers",
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 694) .size = PAGE_SIZE,
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 695) },
dd2a3b7ad98f8 (Michael Halcrow 2007-02-12 00:53:46 -0800 696) {
dd2a3b7ad98f8 (Michael Halcrow 2007-02-12 00:53:46 -0800 697) .cache = &ecryptfs_xattr_cache,
dd2a3b7ad98f8 (Michael Halcrow 2007-02-12 00:53:46 -0800 698) .name = "ecryptfs_xattr_cache",
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 699) .size = PAGE_SIZE,
dd2a3b7ad98f8 (Michael Halcrow 2007-02-12 00:53:46 -0800 700) },
eb95e7ffa50fa (Michael Halcrow 2007-02-16 01:28:40 -0800 701) {
eb95e7ffa50fa (Michael Halcrow 2007-02-16 01:28:40 -0800 702) .cache = &ecryptfs_key_record_cache,
eb95e7ffa50fa (Michael Halcrow 2007-02-16 01:28:40 -0800 703) .name = "ecryptfs_key_record_cache",
eb95e7ffa50fa (Michael Halcrow 2007-02-16 01:28:40 -0800 704) .size = sizeof(struct ecryptfs_key_record),
eb95e7ffa50fa (Michael Halcrow 2007-02-16 01:28:40 -0800 705) },
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 706) {
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 707) .cache = &ecryptfs_key_sig_cache,
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 708) .name = "ecryptfs_key_sig_cache",
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 709) .size = sizeof(struct ecryptfs_key_sig),
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 710) },
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 711) {
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 712) .cache = &ecryptfs_global_auth_tok_cache,
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 713) .name = "ecryptfs_global_auth_tok_cache",
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 714) .size = sizeof(struct ecryptfs_global_auth_tok),
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 715) },
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 716) {
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 717) .cache = &ecryptfs_key_tfm_cache,
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 718) .name = "ecryptfs_key_tfm_cache",
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 719) .size = sizeof(struct ecryptfs_key_tfm),
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 720) },
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 721) };
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 722)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 723) static void ecryptfs_free_kmem_caches(void)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 724) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 725) int i;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 726)
8c0a85377048b (Kirill A. Shutemov 2012-09-26 11:33:07 +1000 727) /*
8c0a85377048b (Kirill A. Shutemov 2012-09-26 11:33:07 +1000 728) * Make sure all delayed rcu free inodes are flushed before we
8c0a85377048b (Kirill A. Shutemov 2012-09-26 11:33:07 +1000 729) * destroy cache.
8c0a85377048b (Kirill A. Shutemov 2012-09-26 11:33:07 +1000 730) */
8c0a85377048b (Kirill A. Shutemov 2012-09-26 11:33:07 +1000 731) rcu_barrier();
8c0a85377048b (Kirill A. Shutemov 2012-09-26 11:33:07 +1000 732)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 733) for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 734) struct ecryptfs_cache_info *info;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 735)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 736) info = &ecryptfs_cache_infos[i];
c39341cf0d083 (Julia Lawall 2015-09-13 14:15:21 +0200 737) kmem_cache_destroy(*(info->cache));
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 738) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 739) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 740)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 741) /**
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 742) * ecryptfs_init_kmem_caches
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 743) *
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 744) * Returns zero on success; non-zero otherwise
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 745) */
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 746) static int ecryptfs_init_kmem_caches(void)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 747) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 748) int i;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 749)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 750) for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 751) struct ecryptfs_cache_info *info;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 752)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 753) info = &ecryptfs_cache_infos[i];
5d097056c9a01 (Vladimir Davydov 2016-01-14 15:18:21 -0800 754) *(info->cache) = kmem_cache_create(info->name, info->size, 0,
5d097056c9a01 (Vladimir Davydov 2016-01-14 15:18:21 -0800 755) SLAB_HWCACHE_ALIGN | info->flags, info->ctor);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 756) if (!*(info->cache)) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 757) ecryptfs_free_kmem_caches();
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 758) ecryptfs_printk(KERN_WARNING, "%s: "
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 759) "kmem_cache_create failed\n",
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 760) info->name);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 761) return -ENOMEM;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 762) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 763) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 764) return 0;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 765) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 766)
6e90aa972dda8 (Greg Kroah-Hartman 2007-11-06 15:08:08 -0800 767) static struct kobject *ecryptfs_kobj;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 768)
386f275f5d097 (Kay Sievers 2007-11-02 13:47:53 +0100 769) static ssize_t version_show(struct kobject *kobj,
386f275f5d097 (Kay Sievers 2007-11-02 13:47:53 +0100 770) struct kobj_attribute *attr, char *buff)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 771) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 772) return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 773) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 774)
386f275f5d097 (Kay Sievers 2007-11-02 13:47:53 +0100 775) static struct kobj_attribute version_attr = __ATTR_RO(version);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 776)
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 777) static struct attribute *attributes[] = {
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 778) &version_attr.attr,
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 779) NULL,
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 780) };
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 781)
4670269faba72 (Arvind Yadav 2017-06-30 15:03:23 +0530 782) static const struct attribute_group attr_group = {
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 783) .attrs = attributes,
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 784) };
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 785)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 786) static int do_sysfs_registration(void)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 787) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 788) int rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 789)
6e90aa972dda8 (Greg Kroah-Hartman 2007-11-06 15:08:08 -0800 790) ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
6e90aa972dda8 (Greg Kroah-Hartman 2007-11-06 15:08:08 -0800 791) if (!ecryptfs_kobj) {
917e865df7eb0 (Greg Kroah-Hartman 2007-10-29 20:13:17 +0100 792) printk(KERN_ERR "Unable to create ecryptfs kset\n");
917e865df7eb0 (Greg Kroah-Hartman 2007-10-29 20:13:17 +0100 793) rc = -ENOMEM;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 794) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 795) }
6e90aa972dda8 (Greg Kroah-Hartman 2007-11-06 15:08:08 -0800 796) rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 797) if (rc) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 798) printk(KERN_ERR
30a468b1c1b99 (Greg Kroah-Hartman 2007-10-15 15:01:24 -0700 799) "Unable to create ecryptfs version attributes\n");
197b12d6796a3 (Greg Kroah-Hartman 2007-12-20 08:13:05 -0800 800) kobject_put(ecryptfs_kobj);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 801) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 802) out:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 803) return rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 804) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 805)
a75de1b3799f8 (Ryusuke Konishi 2007-08-10 13:00:56 -0700 806) static void do_sysfs_unregistration(void)
a75de1b3799f8 (Ryusuke Konishi 2007-08-10 13:00:56 -0700 807) {
6e90aa972dda8 (Greg Kroah-Hartman 2007-11-06 15:08:08 -0800 808) sysfs_remove_group(ecryptfs_kobj, &attr_group);
197b12d6796a3 (Greg Kroah-Hartman 2007-12-20 08:13:05 -0800 809) kobject_put(ecryptfs_kobj);
a75de1b3799f8 (Ryusuke Konishi 2007-08-10 13:00:56 -0700 810) }
a75de1b3799f8 (Ryusuke Konishi 2007-08-10 13:00:56 -0700 811)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 812) static int __init ecryptfs_init(void)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 813) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 814) int rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 815)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 816) if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_SIZE) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 817) rc = -EINVAL;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 818) ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 819) "larger than the host's page size, and so "
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 820) "eCryptfs cannot run on this system. The "
888d57bbc91eb (Joe Perches 2010-11-10 15:46:16 -0800 821) "default eCryptfs extent size is [%u] bytes; "
888d57bbc91eb (Joe Perches 2010-11-10 15:46:16 -0800 822) "the page size is [%lu] bytes.\n",
888d57bbc91eb (Joe Perches 2010-11-10 15:46:16 -0800 823) ECRYPTFS_DEFAULT_EXTENT_SIZE,
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 824) (unsigned long)PAGE_SIZE);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 825) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 826) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 827) rc = ecryptfs_init_kmem_caches();
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 828) if (rc) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 829) printk(KERN_ERR
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 830) "Failed to allocate one or more kmem_cache objects\n");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 831) goto out;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 832) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 833) rc = do_sysfs_registration();
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 834) if (rc) {
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 835) printk(KERN_ERR "sysfs registration failed\n");
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 836) goto out_free_kmem_caches;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 837) }
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 838) rc = ecryptfs_init_kthread();
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 839) if (rc) {
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 840) printk(KERN_ERR "%s: kthread initialization failed; "
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 841) "rc = [%d]\n", __func__, rc);
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 842) goto out_do_sysfs_unregistration;
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 843) }
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 844) rc = ecryptfs_init_messaging();
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 845) if (rc) {
25985edcedea6 (Lucas De Marchi 2011-03-30 22:57:33 -0300 846) printk(KERN_ERR "Failure occurred while attempting to "
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 847) "initialize the communications channel to "
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 848) "ecryptfsd\n");
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 849) goto out_destroy_kthread;
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 850) }
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 851) rc = ecryptfs_init_crypto();
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 852) if (rc) {
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 853) printk(KERN_ERR "Failure whilst attempting to init crypto; "
956159c3d6e7e (Michael Halcrow 2007-10-16 01:27:55 -0700 854) "rc = [%d]\n", rc);
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 855) goto out_release_messaging;
dddfa461fc895 (Michael Halcrow 2007-02-12 00:53:44 -0800 856) }
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 857) rc = register_filesystem(&ecryptfs_fs_type);
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 858) if (rc) {
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 859) printk(KERN_ERR "Failed to register filesystem\n");
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 860) goto out_destroy_crypto;
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 861) }
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 862) if (ecryptfs_verbosity > 0)
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 863) printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 864) "will be written to the syslog!\n", ecryptfs_verbosity);
2830bfd6cf661 (Eric Sandeen 2008-02-06 01:38:34 -0800 865)
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 866) goto out;
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 867) out_destroy_crypto:
0794f569ec307 (Al Viro 2012-03-17 21:29:13 -0400 868) ecryptfs_destroy_crypto();
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 869) out_release_messaging:
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 870) ecryptfs_release_messaging();
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 871) out_destroy_kthread:
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 872) ecryptfs_destroy_kthread();
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 873) out_do_sysfs_unregistration:
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 874) do_sysfs_unregistration();
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 875) out_free_kmem_caches:
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 876) ecryptfs_free_kmem_caches();
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 877) out:
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 878) return rc;
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 879) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 880)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 881) static void __exit ecryptfs_exit(void)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 882) {
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 883) int rc;
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 884)
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 885) rc = ecryptfs_destroy_crypto();
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 886) if (rc)
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 887) printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 888) "rc = [%d]\n", rc);
624ae52845168 (Tyler Hicks 2008-10-15 22:02:51 -0700 889) ecryptfs_release_messaging();
746f1e558bc52 (Michael Halcrow 2008-07-23 21:30:02 -0700 890) ecryptfs_destroy_kthread();
cf81f89d9a85b (Michael Halcrow 2007-10-16 01:28:07 -0700 891) do_sysfs_unregistration();
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 892) unregister_filesystem(&ecryptfs_fs_type);
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 893) ecryptfs_free_kmem_caches();
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 894) }
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 895)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 896) MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 897) MODULE_DESCRIPTION("eCryptfs");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 898)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 899) MODULE_LICENSE("GPL");
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 900)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 901) module_init(ecryptfs_init)
237fead619984 (Michael Halcrow 2006-10-04 02:16:22 -0700 902) module_exit(ecryptfs_exit)
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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