| /** |
| * eCryptfs: Linux filesystem encryption layer |
| * |
| * Copyright (C) 1997-2003 Erez Zadok |
| * Copyright (C) 2001-2003 Stony Brook University |
| * Copyright (C) 2004-2007 International Business Machines Corp. |
| * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
| * Michael C. Thompson <mcthomps@us.ibm.com> |
| * Tyler Hicks <tyhicks@ou.edu> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of the |
| * License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| * 02111-1307, USA. |
| */ |
| |
| #include <linux/dcache.h> |
| #include <linux/file.h> |
| #include <linux/module.h> |
| #include <linux/namei.h> |
| #include <linux/skbuff.h> |
| #include <linux/crypto.h> |
| #include <linux/mount.h> |
| #include <linux/pagemap.h> |
| #include <linux/key.h> |
| #include <linux/parser.h> |
| #include <linux/fs_stack.h> |
| #include <linux/slab.h> |
| #include <linux/magic.h> |
| #include "ecryptfs_kernel.h" |
| |
| /** |
| * Module parameter that defines the ecryptfs_verbosity level. |
| */ |
| int ecryptfs_verbosity = 0; |
| |
| module_param(ecryptfs_verbosity, int, 0); |
| MODULE_PARM_DESC(ecryptfs_verbosity, |
| "Initial verbosity level (0 or 1; defaults to " |
| "0, which is Quiet)"); |
| |
| /** |
| * Module parameter that defines the number of message buffer elements |
| */ |
| unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS; |
| |
| module_param(ecryptfs_message_buf_len, uint, 0); |
| MODULE_PARM_DESC(ecryptfs_message_buf_len, |
| "Number of message buffer elements"); |
| |
| /** |
| * Module parameter that defines the maximum guaranteed amount of time to wait |
| * for a response from ecryptfsd. The actual sleep time will be, more than |
| * likely, a small amount greater than this specified value, but only less if |
| * the message successfully arrives. |
| */ |
| signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ; |
| |
| module_param(ecryptfs_message_wait_timeout, long, 0); |
| MODULE_PARM_DESC(ecryptfs_message_wait_timeout, |
| "Maximum number of seconds that an operation will " |
| "sleep while waiting for a message response from " |
| "userspace"); |
| |
| /** |
| * Module parameter that is an estimate of the maximum number of users |
| * that will be concurrently using eCryptfs. Set this to the right |
| * value to balance performance and memory use. |
| */ |
| unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS; |
| |
| module_param(ecryptfs_number_of_users, uint, 0); |
| MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of " |
| "concurrent users of eCryptfs"); |
| |
| void __ecryptfs_printk(const char *fmt, ...) |
| { |
| va_list args; |
| va_start(args, fmt); |
| if (fmt[1] == '7') { /* KERN_DEBUG */ |
| if (ecryptfs_verbosity >= 1) |
| vprintk(fmt, args); |
| } else |
| vprintk(fmt, args); |
| va_end(args); |
| } |
| |
| /** |
| * ecryptfs_init_lower_file |
| * @ecryptfs_dentry: Fully initialized eCryptfs dentry object, with |
| * the lower dentry and the lower mount set |
| * |
| * eCryptfs only ever keeps a single open file for every lower |
| * inode. All I/O operations to the lower inode occur through that |
| * file. When the first eCryptfs dentry that interposes with the first |
| * lower dentry for that inode is created, this function creates the |
| * lower file struct and associates it with the eCryptfs |
| * inode. When all eCryptfs files associated with the inode are released, the |
| * file is closed. |
| * |
| * The lower file will be opened with read/write permissions, if |
| * possible. Otherwise, it is opened read-only. |
| * |
| * This function does nothing if a lower file is already |
| * associated with the eCryptfs inode. |
| * |
| * Returns zero on success; non-zero otherwise |
| */ |
| static int ecryptfs_init_lower_file(struct dentry *dentry, |
| struct file **lower_file) |
| { |
| const struct cred *cred = current_cred(); |
| struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
| int rc; |
| |
| rc = ecryptfs_privileged_open(lower_file, lower_dentry, lower_mnt, |
| cred); |
| if (rc) { |
| printk(KERN_ERR "Error opening lower file " |
| "for lower_dentry [0x%p] and lower_mnt [0x%p]; " |
| "rc = [%d]\n", lower_dentry, lower_mnt, rc); |
| (*lower_file) = NULL; |
| } |
| return rc; |
| } |
| |
| int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode) |
| { |
| struct ecryptfs_inode_info *inode_info; |
| int count, rc = 0; |
| |
| inode_info = ecryptfs_inode_to_private(inode); |
| mutex_lock(&inode_info->lower_file_mutex); |
| count = atomic_inc_return(&inode_info->lower_file_count); |
| if (WARN_ON_ONCE(count < 1)) |
| rc = -EINVAL; |
| else if (count == 1) { |
| rc = ecryptfs_init_lower_file(dentry, |
| &inode_info->lower_file); |
| if (rc) |
| atomic_set(&inode_info->lower_file_count, 0); |
| } |
| mutex_unlock(&inode_info->lower_file_mutex); |
| return rc; |
| } |
| |
| void ecryptfs_put_lower_file(struct inode *inode) |
| { |
| struct ecryptfs_inode_info *inode_info; |
| |
| inode_info = ecryptfs_inode_to_private(inode); |
| if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count, |
| &inode_info->lower_file_mutex)) { |
| fput(inode_info->lower_file); |
| inode_info->lower_file = NULL; |
| mutex_unlock(&inode_info->lower_file_mutex); |
| } |
| } |
| |
| enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, |
| ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher, |
| ecryptfs_opt_ecryptfs_key_bytes, |
| ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata, |
| ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig, |
| ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes, |
| ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only, |
| ecryptfs_opt_err }; |
| |
| static const match_table_t tokens = { |
| {ecryptfs_opt_sig, "sig=%s"}, |
| {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"}, |
| {ecryptfs_opt_cipher, "cipher=%s"}, |
| {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"}, |
| {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"}, |
| {ecryptfs_opt_passthrough, "ecryptfs_passthrough"}, |
| {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"}, |
| {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"}, |
| {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"}, |
| {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"}, |
| {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"}, |
| {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"}, |
| {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"}, |
| {ecryptfs_opt_err, NULL} |
| }; |
| |
| static int ecryptfs_init_global_auth_toks( |
| struct ecryptfs_mount_crypt_stat *mount_crypt_stat) |
| { |
| struct ecryptfs_global_auth_tok *global_auth_tok; |
| struct ecryptfs_auth_tok *auth_tok; |
| int rc = 0; |
| |
| list_for_each_entry(global_auth_tok, |
| &mount_crypt_stat->global_auth_tok_list, |
| mount_crypt_stat_list) { |
| rc = ecryptfs_keyring_auth_tok_for_sig( |
| &global_auth_tok->global_auth_tok_key, &auth_tok, |
| global_auth_tok->sig); |
| if (rc) { |
| printk(KERN_ERR "Could not find valid key in user " |
| "session keyring for sig specified in mount " |
| "option: [%s]\n", global_auth_tok->sig); |
| global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID; |
| goto out; |
| } else { |
| global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID; |
| up_write(&(global_auth_tok->global_auth_tok_key)->sem); |
| } |
| } |
| out: |
| return rc; |
| } |
| |
| static void ecryptfs_init_mount_crypt_stat( |
| struct ecryptfs_mount_crypt_stat *mount_crypt_stat) |
| { |
| memset((void *)mount_crypt_stat, 0, |
| sizeof(struct ecryptfs_mount_crypt_stat)); |
| INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list); |
| mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex); |
| mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED; |
| } |
| |
| /** |
| * ecryptfs_parse_options |
| * @sb: The ecryptfs super block |
| * @options: The options passed to the kernel |
| * |
| * Parse mount options: |
| * debug=N - ecryptfs_verbosity level for debug output |
| * sig=XXX - description(signature) of the key to use |
| * |
| * Returns the dentry object of the lower-level (lower/interposed) |
| * directory; We want to mount our stackable file system on top of |
| * that lower directory. |
| * |
| * The signature of the key to use must be the description of a key |
| * already in the keyring. Mounting will fail if the key can not be |
| * found. |
| * |
| * Returns zero on success; non-zero on error |
| */ |
| static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options) |
| { |
| char *p; |
| int rc = 0; |
| int sig_set = 0; |
| int cipher_name_set = 0; |
| int fn_cipher_name_set = 0; |
| int cipher_key_bytes; |
| int cipher_key_bytes_set = 0; |
| int fn_cipher_key_bytes; |
| int fn_cipher_key_bytes_set = 0; |
| struct ecryptfs_mount_crypt_stat *mount_crypt_stat = |
| &sbi->mount_crypt_stat; |
| substring_t args[MAX_OPT_ARGS]; |
| int token; |
| char *sig_src; |
| char *cipher_name_dst; |
| char *cipher_name_src; |
| char *fn_cipher_name_dst; |
| char *fn_cipher_name_src; |
| char *fnek_dst; |
| char *fnek_src; |
| char *cipher_key_bytes_src; |
| char *fn_cipher_key_bytes_src; |
| |
| if (!options) { |
| rc = -EINVAL; |
| goto out; |
| } |
| ecryptfs_init_mount_crypt_stat(mount_crypt_stat); |
| while ((p = strsep(&options, ",")) != NULL) { |
| if (!*p) |
| continue; |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case ecryptfs_opt_sig: |
| case ecryptfs_opt_ecryptfs_sig: |
| sig_src = args[0].from; |
| rc = ecryptfs_add_global_auth_tok(mount_crypt_stat, |
| sig_src, 0); |
| if (rc) { |
| printk(KERN_ERR "Error attempting to register " |
| "global sig; rc = [%d]\n", rc); |
| goto out; |
| } |
| sig_set = 1; |
| break; |
| case ecryptfs_opt_cipher: |
| case ecryptfs_opt_ecryptfs_cipher: |
| cipher_name_src = args[0].from; |
| cipher_name_dst = |
| mount_crypt_stat-> |
| global_default_cipher_name; |
| strncpy(cipher_name_dst, cipher_name_src, |
| ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
| cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
| cipher_name_set = 1; |
| break; |
| case ecryptfs_opt_ecryptfs_key_bytes: |
| cipher_key_bytes_src = args[0].from; |
| cipher_key_bytes = |
| (int)simple_strtol(cipher_key_bytes_src, |
| &cipher_key_bytes_src, 0); |
| mount_crypt_stat->global_default_cipher_key_size = |
| cipher_key_bytes; |
| cipher_key_bytes_set = 1; |
| break; |
| case ecryptfs_opt_passthrough: |
| mount_crypt_stat->flags |= |
| ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED; |
| break; |
| case ecryptfs_opt_xattr_metadata: |
| mount_crypt_stat->flags |= |
| ECRYPTFS_XATTR_METADATA_ENABLED; |
| break; |
| case ecryptfs_opt_encrypted_view: |
| mount_crypt_stat->flags |= |
| ECRYPTFS_XATTR_METADATA_ENABLED; |
| mount_crypt_stat->flags |= |
| ECRYPTFS_ENCRYPTED_VIEW_ENABLED; |
| break; |
| case ecryptfs_opt_fnek_sig: |
| fnek_src = args[0].from; |
| fnek_dst = |
| mount_crypt_stat->global_default_fnek_sig; |
| strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX); |
| mount_crypt_stat->global_default_fnek_sig[ |
| ECRYPTFS_SIG_SIZE_HEX] = '\0'; |
| rc = ecryptfs_add_global_auth_tok( |
| mount_crypt_stat, |
| mount_crypt_stat->global_default_fnek_sig, |
| ECRYPTFS_AUTH_TOK_FNEK); |
| if (rc) { |
| printk(KERN_ERR "Error attempting to register " |
| "global fnek sig [%s]; rc = [%d]\n", |
| mount_crypt_stat->global_default_fnek_sig, |
| rc); |
| goto out; |
| } |
| mount_crypt_stat->flags |= |
| (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES |
| | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK); |
| break; |
| case ecryptfs_opt_fn_cipher: |
| fn_cipher_name_src = args[0].from; |
| fn_cipher_name_dst = |
| mount_crypt_stat->global_default_fn_cipher_name; |
| strncpy(fn_cipher_name_dst, fn_cipher_name_src, |
| ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
| mount_crypt_stat->global_default_fn_cipher_name[ |
| ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
| fn_cipher_name_set = 1; |
| break; |
| case ecryptfs_opt_fn_cipher_key_bytes: |
| fn_cipher_key_bytes_src = args[0].from; |
| fn_cipher_key_bytes = |
| (int)simple_strtol(fn_cipher_key_bytes_src, |
| &fn_cipher_key_bytes_src, 0); |
| mount_crypt_stat->global_default_fn_cipher_key_bytes = |
| fn_cipher_key_bytes; |
| fn_cipher_key_bytes_set = 1; |
| break; |
| case ecryptfs_opt_unlink_sigs: |
| mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS; |
| break; |
| case ecryptfs_opt_mount_auth_tok_only: |
| mount_crypt_stat->flags |= |
| ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY; |
| break; |
| case ecryptfs_opt_err: |
| default: |
| printk(KERN_WARNING |
| "%s: eCryptfs: unrecognized option [%s]\n", |
| __func__, p); |
| } |
| } |
| if (!sig_set) { |
| rc = -EINVAL; |
| ecryptfs_printk(KERN_ERR, "You must supply at least one valid " |
| "auth tok signature as a mount " |
| "parameter; see the eCryptfs README\n"); |
| goto out; |
| } |
| if (!cipher_name_set) { |
| int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER); |
| |
| BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
| strcpy(mount_crypt_stat->global_default_cipher_name, |
| ECRYPTFS_DEFAULT_CIPHER); |
| } |
| if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
| && !fn_cipher_name_set) |
| strcpy(mount_crypt_stat->global_default_fn_cipher_name, |
| mount_crypt_stat->global_default_cipher_name); |
| if (!cipher_key_bytes_set) |
| mount_crypt_stat->global_default_cipher_key_size = 0; |
| if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
| && !fn_cipher_key_bytes_set) |
| mount_crypt_stat->global_default_fn_cipher_key_bytes = |
| mount_crypt_stat->global_default_cipher_key_size; |
| mutex_lock(&key_tfm_list_mutex); |
| if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name, |
| NULL)) { |
| rc = ecryptfs_add_new_key_tfm( |
| NULL, mount_crypt_stat->global_default_cipher_name, |
| mount_crypt_stat->global_default_cipher_key_size); |
| if (rc) { |
| printk(KERN_ERR "Error attempting to initialize " |
| "cipher with name = [%s] and key size = [%td]; " |
| "rc = [%d]\n", |
| mount_crypt_stat->global_default_cipher_name, |
| mount_crypt_stat->global_default_cipher_key_size, |
| rc); |
| rc = -EINVAL; |
| mutex_unlock(&key_tfm_list_mutex); |
| goto out; |
| } |
| } |
| if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
| && !ecryptfs_tfm_exists( |
| mount_crypt_stat->global_default_fn_cipher_name, NULL)) { |
| rc = ecryptfs_add_new_key_tfm( |
| NULL, mount_crypt_stat->global_default_fn_cipher_name, |
| mount_crypt_stat->global_default_fn_cipher_key_bytes); |
| if (rc) { |
| printk(KERN_ERR "Error attempting to initialize " |
| "cipher with name = [%s] and key size = [%td]; " |
| "rc = [%d]\n", |
| mount_crypt_stat->global_default_fn_cipher_name, |
| mount_crypt_stat->global_default_fn_cipher_key_bytes, |
| rc); |
| rc = -EINVAL; |
| mutex_unlock(&key_tfm_list_mutex); |
| goto out; |
| } |
| } |
| mutex_unlock(&key_tfm_list_mutex); |
| rc = ecryptfs_init_global_auth_toks(mount_crypt_stat); |
| if (rc) |
| printk(KERN_WARNING "One or more global auth toks could not " |
| "properly register; rc = [%d]\n", rc); |
| out: |
| return rc; |
| } |
| |
| struct kmem_cache *ecryptfs_sb_info_cache; |
| static struct file_system_type ecryptfs_fs_type; |
| |
| /** |
| * ecryptfs_get_sb |
| * @fs_type |
| * @flags |
| * @dev_name: The path to mount over |
| * @raw_data: The options passed into the kernel |
| */ |
| static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *raw_data) |
| { |
| struct super_block *s; |
| struct ecryptfs_sb_info *sbi; |
| struct ecryptfs_dentry_info *root_info; |
| const char *err = "Getting sb failed"; |
| struct inode *inode; |
| struct path path; |
| int rc; |
| |
| sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL); |
| if (!sbi) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| rc = ecryptfs_parse_options(sbi, raw_data); |
| if (rc) { |
| err = "Error parsing options"; |
| goto out; |
| } |
| |
| s = sget(fs_type, NULL, set_anon_super, NULL); |
| if (IS_ERR(s)) { |
| rc = PTR_ERR(s); |
| goto out; |
| } |
| |
| s->s_flags = flags; |
| rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY); |
| if (rc) |
| goto out1; |
| |
| ecryptfs_set_superblock_private(s, sbi); |
| s->s_bdi = &sbi->bdi; |
| |
| /* ->kill_sb() will take care of sbi after that point */ |
| sbi = NULL; |
| s->s_op = &ecryptfs_sops; |
| s->s_d_op = &ecryptfs_dops; |
| |
| err = "Reading sb failed"; |
| rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); |
| if (rc) { |
| ecryptfs_printk(KERN_WARNING, "kern_path() failed\n"); |
| goto out1; |
| } |
| if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) { |
| rc = -EINVAL; |
| printk(KERN_ERR "Mount on filesystem of type " |
| "eCryptfs explicitly disallowed due to " |
| "known incompatibilities\n"); |
| goto out_free; |
| } |
| ecryptfs_set_superblock_lower(s, path.dentry->d_sb); |
| s->s_maxbytes = path.dentry->d_sb->s_maxbytes; |
| s->s_blocksize = path.dentry->d_sb->s_blocksize; |
| s->s_magic = ECRYPTFS_SUPER_MAGIC; |
| |
| inode = ecryptfs_get_inode(path.dentry->d_inode, s); |
| rc = PTR_ERR(inode); |
| if (IS_ERR(inode)) |
| goto out_free; |
| |
| s->s_root = d_alloc_root(inode); |
| if (!s->s_root) { |
| iput(inode); |
| rc = -ENOMEM; |
| goto out_free; |
| } |
| |
| rc = -ENOMEM; |
| root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
| if (!root_info) |
| goto out_free; |
| |
| /* ->kill_sb() will take care of root_info */ |
| ecryptfs_set_dentry_private(s->s_root, root_info); |
| ecryptfs_set_dentry_lower(s->s_root, path.dentry); |
| ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt); |
| |
| s->s_flags |= MS_ACTIVE; |
| return dget(s->s_root); |
| |
| out_free: |
| path_put(&path); |
| out1: |
| deactivate_locked_super(s); |
| out: |
| if (sbi) { |
| ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat); |
| kmem_cache_free(ecryptfs_sb_info_cache, sbi); |
| } |
| printk(KERN_ERR "%s; rc = [%d]\n", err, rc); |
| return ERR_PTR(rc); |
| } |
| |
| /** |
| * ecryptfs_kill_block_super |
| * @sb: The ecryptfs super block |
| * |
| * Used to bring the superblock down and free the private data. |
| */ |
| static void ecryptfs_kill_block_super(struct super_block *sb) |
| { |
| struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb); |
| kill_anon_super(sb); |
| if (!sb_info) |
| return; |
| ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat); |
| bdi_destroy(&sb_info->bdi); |
| kmem_cache_free(ecryptfs_sb_info_cache, sb_info); |
| } |
| |
| static struct file_system_type ecryptfs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ecryptfs", |
| .mount = ecryptfs_mount, |
| .kill_sb = ecryptfs_kill_block_super, |
| .fs_flags = 0 |
| }; |
| |
| /** |
| * inode_info_init_once |
| * |
| * Initializes the ecryptfs_inode_info_cache when it is created |
| */ |
| static void |
| inode_info_init_once(void *vptr) |
| { |
| struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr; |
| |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static struct ecryptfs_cache_info { |
| struct kmem_cache **cache; |
| const char *name; |
| size_t size; |
| void (*ctor)(void *obj); |
| } ecryptfs_cache_infos[] = { |
| { |
| .cache = &ecryptfs_auth_tok_list_item_cache, |
| .name = "ecryptfs_auth_tok_list_item", |
| .size = sizeof(struct ecryptfs_auth_tok_list_item), |
| }, |
| { |
| .cache = &ecryptfs_file_info_cache, |
| .name = "ecryptfs_file_cache", |
| .size = sizeof(struct ecryptfs_file_info), |
| }, |
| { |
| .cache = &ecryptfs_dentry_info_cache, |
| .name = "ecryptfs_dentry_info_cache", |
| .size = sizeof(struct ecryptfs_dentry_info), |
| }, |
| { |
| .cache = &ecryptfs_inode_info_cache, |
| .name = "ecryptfs_inode_cache", |
| .size = sizeof(struct ecryptfs_inode_info), |
| .ctor = inode_info_init_once, |
| }, |
| { |
| .cache = &ecryptfs_sb_info_cache, |
| .name = "ecryptfs_sb_cache", |
| .size = sizeof(struct ecryptfs_sb_info), |
| }, |
| { |
| .cache = &ecryptfs_header_cache_1, |
| .name = "ecryptfs_headers_1", |
| .size = PAGE_CACHE_SIZE, |
| }, |
| { |
| .cache = &ecryptfs_header_cache_2, |
| .name = "ecryptfs_headers_2", |
| .size = PAGE_CACHE_SIZE, |
| }, |
| { |
| .cache = &ecryptfs_xattr_cache, |
| .name = "ecryptfs_xattr_cache", |
| .size = PAGE_CACHE_SIZE, |
| }, |
| { |
| .cache = &ecryptfs_key_record_cache, |
| .name = "ecryptfs_key_record_cache", |
| .size = sizeof(struct ecryptfs_key_record), |
| }, |
| { |
| .cache = &ecryptfs_key_sig_cache, |
| .name = "ecryptfs_key_sig_cache", |
| .size = sizeof(struct ecryptfs_key_sig), |
| }, |
| { |
| .cache = &ecryptfs_global_auth_tok_cache, |
| .name = "ecryptfs_global_auth_tok_cache", |
| .size = sizeof(struct ecryptfs_global_auth_tok), |
| }, |
| { |
| .cache = &ecryptfs_key_tfm_cache, |
| .name = "ecryptfs_key_tfm_cache", |
| .size = sizeof(struct ecryptfs_key_tfm), |
| }, |
| { |
| .cache = &ecryptfs_open_req_cache, |
| .name = "ecryptfs_open_req_cache", |
| .size = sizeof(struct ecryptfs_open_req), |
| }, |
| }; |
| |
| static void ecryptfs_free_kmem_caches(void) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { |
| struct ecryptfs_cache_info *info; |
| |
| info = &ecryptfs_cache_infos[i]; |
| if (*(info->cache)) |
| kmem_cache_destroy(*(info->cache)); |
| } |
| } |
| |
| /** |
| * ecryptfs_init_kmem_caches |
| * |
| * Returns zero on success; non-zero otherwise |
| */ |
| static int ecryptfs_init_kmem_caches(void) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { |
| struct ecryptfs_cache_info *info; |
| |
| info = &ecryptfs_cache_infos[i]; |
| *(info->cache) = kmem_cache_create(info->name, info->size, |
| 0, SLAB_HWCACHE_ALIGN, info->ctor); |
| if (!*(info->cache)) { |
| ecryptfs_free_kmem_caches(); |
| ecryptfs_printk(KERN_WARNING, "%s: " |
| "kmem_cache_create failed\n", |
| info->name); |
| return -ENOMEM; |
| } |
| } |
| return 0; |
| } |
| |
| static struct kobject *ecryptfs_kobj; |
| |
| static ssize_t version_show(struct kobject *kobj, |
| struct kobj_attribute *attr, char *buff) |
| { |
| return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK); |
| } |
| |
| static struct kobj_attribute version_attr = __ATTR_RO(version); |
| |
| static struct attribute *attributes[] = { |
| &version_attr.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group attr_group = { |
| .attrs = attributes, |
| }; |
| |
| static int do_sysfs_registration(void) |
| { |
| int rc; |
| |
| ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj); |
| if (!ecryptfs_kobj) { |
| printk(KERN_ERR "Unable to create ecryptfs kset\n"); |
| rc = -ENOMEM; |
| goto out; |
| } |
| rc = sysfs_create_group(ecryptfs_kobj, &attr_group); |
| if (rc) { |
| printk(KERN_ERR |
| "Unable to create ecryptfs version attributes\n"); |
| kobject_put(ecryptfs_kobj); |
| } |
| out: |
| return rc; |
| } |
| |
| static void do_sysfs_unregistration(void) |
| { |
| sysfs_remove_group(ecryptfs_kobj, &attr_group); |
| kobject_put(ecryptfs_kobj); |
| } |
| |
| static int __init ecryptfs_init(void) |
| { |
| int rc; |
| |
| if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) { |
| rc = -EINVAL; |
| ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is " |
| "larger than the host's page size, and so " |
| "eCryptfs cannot run on this system. The " |
| "default eCryptfs extent size is [%u] bytes; " |
| "the page size is [%lu] bytes.\n", |
| ECRYPTFS_DEFAULT_EXTENT_SIZE, |
| (unsigned long)PAGE_CACHE_SIZE); |
| goto out; |
| } |
| rc = ecryptfs_init_kmem_caches(); |
| if (rc) { |
| printk(KERN_ERR |
| "Failed to allocate one or more kmem_cache objects\n"); |
| goto out; |
| } |
| rc = register_filesystem(&ecryptfs_fs_type); |
| if (rc) { |
| printk(KERN_ERR "Failed to register filesystem\n"); |
| goto out_free_kmem_caches; |
| } |
| rc = do_sysfs_registration(); |
| if (rc) { |
| printk(KERN_ERR "sysfs registration failed\n"); |
| goto out_unregister_filesystem; |
| } |
| rc = ecryptfs_init_kthread(); |
| if (rc) { |
| printk(KERN_ERR "%s: kthread initialization failed; " |
| "rc = [%d]\n", __func__, rc); |
| goto out_do_sysfs_unregistration; |
| } |
| rc = ecryptfs_init_messaging(); |
| if (rc) { |
| printk(KERN_ERR "Failure occurred while attempting to " |
| "initialize the communications channel to " |
| "ecryptfsd\n"); |
| goto out_destroy_kthread; |
| } |
| rc = ecryptfs_init_crypto(); |
| if (rc) { |
| printk(KERN_ERR "Failure whilst attempting to init crypto; " |
| "rc = [%d]\n", rc); |
| goto out_release_messaging; |
| } |
| if (ecryptfs_verbosity > 0) |
| printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values " |
| "will be written to the syslog!\n", ecryptfs_verbosity); |
| |
| goto out; |
| out_release_messaging: |
| ecryptfs_release_messaging(); |
| out_destroy_kthread: |
| ecryptfs_destroy_kthread(); |
| out_do_sysfs_unregistration: |
| do_sysfs_unregistration(); |
| out_unregister_filesystem: |
| unregister_filesystem(&ecryptfs_fs_type); |
| out_free_kmem_caches: |
| ecryptfs_free_kmem_caches(); |
| out: |
| return rc; |
| } |
| |
| static void __exit ecryptfs_exit(void) |
| { |
| int rc; |
| |
| rc = ecryptfs_destroy_crypto(); |
| if (rc) |
| printk(KERN_ERR "Failure whilst attempting to destroy crypto; " |
| "rc = [%d]\n", rc); |
| ecryptfs_release_messaging(); |
| ecryptfs_destroy_kthread(); |
| do_sysfs_unregistration(); |
| unregister_filesystem(&ecryptfs_fs_type); |
| ecryptfs_free_kmem_caches(); |
| } |
| |
| MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>"); |
| MODULE_DESCRIPTION("eCryptfs"); |
| |
| MODULE_LICENSE("GPL"); |
| |
| module_init(ecryptfs_init) |
| module_exit(ecryptfs_exit) |