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linux/fs/ecryptfs/ecryptfs_kernel.h
Tyler Hicks b59db43ad4 eCryptfs: Prevent file create race condition 
The file creation path prematurely called d_instantiate() and
unlock_new_inode() before the eCryptfs inode info was fully
allocated and initialized and before the eCryptfs metadata was written
to the lower file.

This could result in race conditions in subsequent file and inode
operations leading to unexpected error conditions or a null pointer
dereference while attempting to use the unallocated memory.

https://launchpad.net/bugs/813146

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: stable@kernel.org
2011-11-23 15:39:38 -06:00

703 lines
24 KiB
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/**
* eCryptfs: Linux filesystem encryption layer
* Kernel declarations.
*
* Copyright (C) 1997-2003 Erez Zadok
* Copyright (C) 2001-2003 Stony Brook University
* Copyright (C) 2004-2008 International Business Machines Corp.
* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
* Trevor S. Highland <trevor.highland@gmail.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.
*/
#ifndef ECRYPTFS_KERNEL_H
#define ECRYPTFS_KERNEL_H
#include <keys/user-type.h>
#include <keys/encrypted-type.h>
#include <linux/fs.h>
#include <linux/fs_stack.h>
#include <linux/namei.h>
#include <linux/scatterlist.h>
#include <linux/hash.h>
#include <linux/nsproxy.h>
#include <linux/backing-dev.h>
#include <linux/ecryptfs.h>
#define ECRYPTFS_DEFAULT_IV_BYTES 16
#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096
#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192
#define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32
#define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ
#define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)
#define ECRYPTFS_DEFAULT_NUM_USERS 4
#define ECRYPTFS_MAX_NUM_USERS 32768
#define ECRYPTFS_XATTR_NAME "user.ecryptfs"
void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
struct ecryptfs_key_record {
unsigned char type;
size_t enc_key_size;
unsigned char sig[ECRYPTFS_SIG_SIZE];
unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];
};
struct ecryptfs_auth_tok_list {
struct ecryptfs_auth_tok *auth_tok;
struct list_head list;
};
struct ecryptfs_crypt_stat;
struct ecryptfs_mount_crypt_stat;
struct ecryptfs_page_crypt_context {
struct page *page;
#define ECRYPTFS_PREPARE_COMMIT_MODE 0
#define ECRYPTFS_WRITEPAGE_MODE 1
unsigned int mode;
union {
struct file *lower_file;
struct writeback_control *wbc;
} param;
};
#if defined(CONFIG_ENCRYPTED_KEYS) || defined(CONFIG_ENCRYPTED_KEYS_MODULE)
static inline struct ecryptfs_auth_tok *
ecryptfs_get_encrypted_key_payload_data(struct key *key)
{
if (key->type == &key_type_encrypted)
return (struct ecryptfs_auth_tok *)
(&((struct encrypted_key_payload *)key->payload.data)->payload_data);
else
return NULL;
}
static inline struct key *ecryptfs_get_encrypted_key(char *sig)
{
return request_key(&key_type_encrypted, sig, NULL);
}
#else
static inline struct ecryptfs_auth_tok *
ecryptfs_get_encrypted_key_payload_data(struct key *key)
{
return NULL;
}
static inline struct key *ecryptfs_get_encrypted_key(char *sig)
{
return ERR_PTR(-ENOKEY);
}
#endif /* CONFIG_ENCRYPTED_KEYS */
static inline struct ecryptfs_auth_tok *
ecryptfs_get_key_payload_data(struct key *key)
{
struct ecryptfs_auth_tok *auth_tok;
auth_tok = ecryptfs_get_encrypted_key_payload_data(key);
if (!auth_tok)
return (struct ecryptfs_auth_tok *)
(((struct user_key_payload *)key->payload.data)->data);
else
return auth_tok;
}
#define ECRYPTFS_MAX_KEYSET_SIZE 1024
#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
#define ECRYPTFS_MAX_NUM_ENC_KEYS 64
#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
#define ECRYPTFS_SALT_BYTES 2
#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */
#define ECRYPTFS_FILE_SIZE_BYTES (sizeof(u64))
#define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
+ MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
#define ECRYPTFS_DEFAULT_CIPHER "aes"
#define ECRYPTFS_DEFAULT_KEY_BYTES 16
#define ECRYPTFS_DEFAULT_HASH "md5"
#define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH
#define ECRYPTFS_TAG_1_PACKET_TYPE 0x01
#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C
#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED
#define ECRYPTFS_TAG_64_PACKET_TYPE 0x40
#define ECRYPTFS_TAG_65_PACKET_TYPE 0x41
#define ECRYPTFS_TAG_66_PACKET_TYPE 0x42
#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
#define ECRYPTFS_TAG_70_PACKET_TYPE 0x46 /* FNEK-encrypted filename
* as dentry name */
#define ECRYPTFS_TAG_71_PACKET_TYPE 0x47 /* FNEK-encrypted filename in
* metadata */
#define ECRYPTFS_TAG_72_PACKET_TYPE 0x48 /* FEK-encrypted filename as
* dentry name */
#define ECRYPTFS_TAG_73_PACKET_TYPE 0x49 /* FEK-encrypted filename as
* metadata */
/* Constraint: ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES >=
* ECRYPTFS_MAX_IV_BYTES */
#define ECRYPTFS_FILENAME_MIN_RANDOM_PREPEND_BYTES 16
#define ECRYPTFS_NON_NULL 0x42 /* A reasonable substitute for NULL */
#define MD5_DIGEST_SIZE 16
#define ECRYPTFS_TAG_70_DIGEST_SIZE MD5_DIGEST_SIZE
#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FEK_ENCRYPTED."
#define ECRYPTFS_FEK_ENCRYPTED_FILENAME_PREFIX_SIZE 23
#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX "ECRYPTFS_FNEK_ENCRYPTED."
#define ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE 24
#define ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN (18 + 1 + 4 + 1 + 32)
struct ecryptfs_key_sig {
struct list_head crypt_stat_list;
char keysig[ECRYPTFS_SIG_SIZE_HEX + 1];
};
struct ecryptfs_filename {
struct list_head crypt_stat_list;
#define ECRYPTFS_FILENAME_CONTAINS_DECRYPTED 0x00000001
u32 flags;
u32 seq_no;
char *filename;
char *encrypted_filename;
size_t filename_size;
size_t encrypted_filename_size;
char fnek_sig[ECRYPTFS_SIG_SIZE_HEX];
char dentry_name[ECRYPTFS_ENCRYPTED_DENTRY_NAME_LEN + 1];
};
/**
* This is the primary struct associated with each encrypted file.
*
* TODO: cache align/pack?
*/
struct ecryptfs_crypt_stat {
#define ECRYPTFS_STRUCT_INITIALIZED 0x00000001
#define ECRYPTFS_POLICY_APPLIED 0x00000002
#define ECRYPTFS_ENCRYPTED 0x00000004
#define ECRYPTFS_SECURITY_WARNING 0x00000008
#define ECRYPTFS_ENABLE_HMAC 0x00000010
#define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000020
#define ECRYPTFS_KEY_VALID 0x00000040
#define ECRYPTFS_METADATA_IN_XATTR 0x00000080
#define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000100
#define ECRYPTFS_KEY_SET 0x00000200
#define ECRYPTFS_ENCRYPT_FILENAMES 0x00000400
#define ECRYPTFS_ENCFN_USE_MOUNT_FNEK 0x00000800
#define ECRYPTFS_ENCFN_USE_FEK 0x00001000
#define ECRYPTFS_UNLINK_SIGS 0x00002000
#define ECRYPTFS_I_SIZE_INITIALIZED 0x00004000
u32 flags;
unsigned int file_version;
size_t iv_bytes;
size_t metadata_size;
size_t extent_size; /* Data extent size; default is 4096 */
size_t key_size;
size_t extent_shift;
unsigned int extent_mask;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
struct crypto_blkcipher *tfm;
struct crypto_hash *hash_tfm; /* Crypto context for generating
* the initialization vectors */
unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
struct list_head keysig_list;
struct mutex keysig_list_mutex;
struct mutex cs_tfm_mutex;
struct mutex cs_hash_tfm_mutex;
struct mutex cs_mutex;
};
/* inode private data. */
struct ecryptfs_inode_info {
struct inode vfs_inode;
struct inode *wii_inode;
struct mutex lower_file_mutex;
atomic_t lower_file_count;
struct file *lower_file;
struct ecryptfs_crypt_stat crypt_stat;
};
/* dentry private data. Each dentry must keep track of a lower
* vfsmount too. */
struct ecryptfs_dentry_info {
struct path lower_path;
struct ecryptfs_crypt_stat *crypt_stat;
};
/**
* ecryptfs_global_auth_tok - A key used to encrypt all new files under the mountpoint
* @flags: Status flags
* @mount_crypt_stat_list: These auth_toks hang off the mount-wide
* cryptographic context. Every time a new
* inode comes into existence, eCryptfs copies
* the auth_toks on that list to the set of
* auth_toks on the inode's crypt_stat
* @global_auth_tok_key: The key from the user's keyring for the sig
* @global_auth_tok: The key contents
* @sig: The key identifier
*
* ecryptfs_global_auth_tok structs refer to authentication token keys
* in the user keyring that apply to newly created files. A list of
* these objects hangs off of the mount_crypt_stat struct for any
* given eCryptfs mount. This struct maintains a reference to both the
* key contents and the key itself so that the key can be put on
* unmount.
*/
struct ecryptfs_global_auth_tok {
#define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
#define ECRYPTFS_AUTH_TOK_FNEK 0x00000002
u32 flags;
struct list_head mount_crypt_stat_list;
struct key *global_auth_tok_key;
unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
};
/**
* ecryptfs_key_tfm - Persistent key tfm
* @key_tfm: crypto API handle to the key
* @key_size: Key size in bytes
* @key_tfm_mutex: Mutex to ensure only one operation in eCryptfs is
* using the persistent TFM at any point in time
* @key_tfm_list: Handle to hang this off the module-wide TFM list
* @cipher_name: String name for the cipher for this TFM
*
* Typically, eCryptfs will use the same ciphers repeatedly throughout
* the course of its operations. In order to avoid unnecessarily
* destroying and initializing the same cipher repeatedly, eCryptfs
* keeps a list of crypto API contexts around to use when needed.
*/
struct ecryptfs_key_tfm {
struct crypto_blkcipher *key_tfm;
size_t key_size;
struct mutex key_tfm_mutex;
struct list_head key_tfm_list;
unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
};
extern struct mutex key_tfm_list_mutex;
/**
* This struct is to enable a mount-wide passphrase/salt combo. This
* is more or less a stopgap to provide similar functionality to other
* crypto filesystems like EncFS or CFS until full policy support is
* implemented in eCryptfs.
*/
struct ecryptfs_mount_crypt_stat {
/* Pointers to memory we do not own, do not free these */
#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
#define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
#define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
#define ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES 0x00000010
#define ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK 0x00000020
#define ECRYPTFS_GLOBAL_ENCFN_USE_FEK 0x00000040
#define ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY 0x00000080
u32 flags;
struct list_head global_auth_tok_list;
struct mutex global_auth_tok_list_mutex;
size_t global_default_cipher_key_size;
size_t global_default_fn_cipher_key_bytes;
unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
+ 1];
unsigned char global_default_fn_cipher_name[
ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
};
/* superblock private data. */
struct ecryptfs_sb_info {
struct super_block *wsi_sb;
struct ecryptfs_mount_crypt_stat mount_crypt_stat;
struct backing_dev_info bdi;
};
/* file private data. */
struct ecryptfs_file_info {
struct file *wfi_file;
struct ecryptfs_crypt_stat *crypt_stat;
};
/* auth_tok <=> encrypted_session_key mappings */
struct ecryptfs_auth_tok_list_item {
unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES];
struct list_head list;
struct ecryptfs_auth_tok auth_tok;
};
struct ecryptfs_message {
/* Can never be greater than ecryptfs_message_buf_len */
/* Used to find the parent msg_ctx */
/* Inherits from msg_ctx->index */
u32 index;
u32 data_len;
u8 data[];
};
struct ecryptfs_msg_ctx {
#define ECRYPTFS_MSG_CTX_STATE_FREE 0x01
#define ECRYPTFS_MSG_CTX_STATE_PENDING 0x02
#define ECRYPTFS_MSG_CTX_STATE_DONE 0x03
#define ECRYPTFS_MSG_CTX_STATE_NO_REPLY 0x04
u8 state;
#define ECRYPTFS_MSG_HELO 100
#define ECRYPTFS_MSG_QUIT 101
#define ECRYPTFS_MSG_REQUEST 102
#define ECRYPTFS_MSG_RESPONSE 103
u8 type;
u32 index;
/* Counter converts to a sequence number. Each message sent
* out for which we expect a response has an associated
* sequence number. The response must have the same sequence
* number as the counter for the msg_stc for the message to be
* valid. */
u32 counter;
size_t msg_size;
struct ecryptfs_message *msg;
struct task_struct *task;
struct list_head node;
struct list_head daemon_out_list;
struct mutex mux;
};
struct ecryptfs_daemon;
struct ecryptfs_daemon {
#define ECRYPTFS_DAEMON_IN_READ 0x00000001
#define ECRYPTFS_DAEMON_IN_POLL 0x00000002
#define ECRYPTFS_DAEMON_ZOMBIE 0x00000004
#define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
u32 flags;
u32 num_queued_msg_ctx;
struct pid *pid;
uid_t euid;
struct user_namespace *user_ns;
struct task_struct *task;
struct mutex mux;
struct list_head msg_ctx_out_queue;
wait_queue_head_t wait;
struct hlist_node euid_chain;
};
extern struct mutex ecryptfs_daemon_hash_mux;
static inline size_t
ecryptfs_lower_header_size(struct ecryptfs_crypt_stat *crypt_stat)
{
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
return 0;
return crypt_stat->metadata_size;
}
static inline struct ecryptfs_file_info *
ecryptfs_file_to_private(struct file *file)
{
return file->private_data;
}
static inline void
ecryptfs_set_file_private(struct file *file,
struct ecryptfs_file_info *file_info)
{
file->private_data = file_info;
}
static inline struct file *ecryptfs_file_to_lower(struct file *file)
{
return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;
}
static inline void
ecryptfs_set_file_lower(struct file *file, struct file *lower_file)
{
((struct ecryptfs_file_info *)file->private_data)->wfi_file =
lower_file;
}
static inline struct ecryptfs_inode_info *
ecryptfs_inode_to_private(struct inode *inode)
{
return container_of(inode, struct ecryptfs_inode_info, vfs_inode);
}
static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode)
{
return ecryptfs_inode_to_private(inode)->wii_inode;
}
static inline void
ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode)
{
ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;
}
static inline struct ecryptfs_sb_info *
ecryptfs_superblock_to_private(struct super_block *sb)
{
return (struct ecryptfs_sb_info *)sb->s_fs_info;
}
static inline void
ecryptfs_set_superblock_private(struct super_block *sb,
struct ecryptfs_sb_info *sb_info)
{
sb->s_fs_info = sb_info;
}
static inline struct super_block *
ecryptfs_superblock_to_lower(struct super_block *sb)
{
return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;
}
static inline void
ecryptfs_set_superblock_lower(struct super_block *sb,
struct super_block *lower_sb)
{
((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;
}
static inline struct ecryptfs_dentry_info *
ecryptfs_dentry_to_private(struct dentry *dentry)
{
return (struct ecryptfs_dentry_info *)dentry->d_fsdata;
}
static inline void
ecryptfs_set_dentry_private(struct dentry *dentry,
struct ecryptfs_dentry_info *dentry_info)
{
dentry->d_fsdata = dentry_info;
}
static inline struct dentry *
ecryptfs_dentry_to_lower(struct dentry *dentry)
{
return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
}
static inline void
ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry)
{
((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry =
lower_dentry;
}
static inline struct vfsmount *
ecryptfs_dentry_to_lower_mnt(struct dentry *dentry)
{
return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;
}
static inline void
ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt)
{
((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt =
lower_mnt;
}
#define ecryptfs_printk(type, fmt, arg...) \
__ecryptfs_printk(type "%s: " fmt, __func__, ## arg);
__printf(1, 2)
void __ecryptfs_printk(const char *fmt, ...);
extern const struct file_operations ecryptfs_main_fops;
extern const struct file_operations ecryptfs_dir_fops;
extern const struct inode_operations ecryptfs_main_iops;
extern const struct inode_operations ecryptfs_dir_iops;
extern const struct inode_operations ecryptfs_symlink_iops;
extern const struct super_operations ecryptfs_sops;
extern const struct dentry_operations ecryptfs_dops;
extern const struct address_space_operations ecryptfs_aops;
extern int ecryptfs_verbosity;
extern unsigned int ecryptfs_message_buf_len;
extern signed long ecryptfs_message_wait_timeout;
extern unsigned int ecryptfs_number_of_users;
extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;
extern struct kmem_cache *ecryptfs_file_info_cache;
extern struct kmem_cache *ecryptfs_dentry_info_cache;
extern struct kmem_cache *ecryptfs_inode_info_cache;
extern struct kmem_cache *ecryptfs_sb_info_cache;
extern struct kmem_cache *ecryptfs_header_cache;
extern struct kmem_cache *ecryptfs_xattr_cache;
extern struct kmem_cache *ecryptfs_key_record_cache;
extern struct kmem_cache *ecryptfs_key_sig_cache;
extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
extern struct kmem_cache *ecryptfs_key_tfm_cache;
extern struct kmem_cache *ecryptfs_open_req_cache;
struct ecryptfs_open_req {
#define ECRYPTFS_REQ_PROCESSED 0x00000001
#define ECRYPTFS_REQ_DROPPED 0x00000002
#define ECRYPTFS_REQ_ZOMBIE 0x00000004
u32 flags;
struct file **lower_file;
struct dentry *lower_dentry;
struct vfsmount *lower_mnt;
wait_queue_head_t wait;
struct mutex mux;
struct list_head kthread_ctl_list;
};
struct inode *ecryptfs_get_inode(struct inode *lower_inode,
struct super_block *sb);
void ecryptfs_i_size_init(const char *page_virt, struct inode *inode);
int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
size_t *decrypted_name_size,
struct dentry *ecryptfs_dentry,
const char *name, size_t name_size);
int ecryptfs_fill_zeros(struct file *file, loff_t new_length);
int ecryptfs_encrypt_and_encode_filename(
char **encoded_name,
size_t *encoded_name_size,
struct ecryptfs_crypt_stat *crypt_stat,
struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
const char *name, size_t name_size);
struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);
void ecryptfs_dump_hex(char *data, int bytes);
int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
int sg_size);
int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);
void ecryptfs_rotate_iv(unsigned char *iv);
void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
void ecryptfs_destroy_mount_crypt_stat(
struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode);
int ecryptfs_encrypt_page(struct page *page);
int ecryptfs_decrypt_page(struct page *page);
int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
struct inode *ecryptfs_inode);
int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry);
int ecryptfs_new_file_context(struct inode *ecryptfs_inode);
void ecryptfs_write_crypt_stat_flags(char *page_virt,
struct ecryptfs_crypt_stat *crypt_stat,
size_t *written);
int ecryptfs_read_and_validate_header_region(struct inode *inode);
int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
struct inode *inode);
u8 ecryptfs_code_for_cipher_string(char *cipher_name, size_t key_bytes);
int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code);
void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat);
int ecryptfs_generate_key_packet_set(char *dest_base,
struct ecryptfs_crypt_stat *crypt_stat,
struct dentry *ecryptfs_dentry,
size_t *len, size_t max);
int
ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
unsigned char *src, struct dentry *ecryptfs_dentry);
int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
ssize_t
ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
void *value, size_t size);
int
ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags);
int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
int ecryptfs_process_helo(uid_t euid, struct user_namespace *user_ns,
struct pid *pid);
int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
struct pid *pid);
int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
struct user_namespace *user_ns, struct pid *pid,
u32 seq);
int ecryptfs_send_message(char *data, int data_len,
struct ecryptfs_msg_ctx **msg_ctx);
int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
struct ecryptfs_message **emsg);
int ecryptfs_init_messaging(void);
void ecryptfs_release_messaging(void);
void
ecryptfs_write_header_metadata(char *virt,
struct ecryptfs_crypt_stat *crypt_stat,
size_t *written);
int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
int
ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
char *sig, u32 global_auth_tok_flags);
int ecryptfs_get_global_auth_tok_for_sig(
struct ecryptfs_global_auth_tok **global_auth_tok,
struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
int
ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
size_t key_size);
int ecryptfs_init_crypto(void);
int ecryptfs_destroy_crypto(void);
int ecryptfs_tfm_exists(char *cipher_name, struct ecryptfs_key_tfm **key_tfm);
int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
struct mutex **tfm_mutex,
char *cipher_name);
int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
struct ecryptfs_auth_tok **auth_tok,
char *sig);
int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
loff_t offset, size_t size);
int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
struct page *page_for_lower,
size_t offset_in_page, size_t size);
int ecryptfs_write(struct inode *inode, char *data, loff_t offset, size_t size);
int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
struct inode *ecryptfs_inode);
int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
pgoff_t page_index,
size_t offset_in_page, size_t size,
struct inode *ecryptfs_inode);
struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index);
int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
struct user_namespace *user_ns);
int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
size_t *length_size);
int ecryptfs_write_packet_length(char *dest, size_t size,
size_t *packet_size_length);
int ecryptfs_init_ecryptfs_miscdev(void);
void ecryptfs_destroy_ecryptfs_miscdev(void);
int ecryptfs_send_miscdev(char *data, size_t data_size,
struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
u16 msg_flags, struct ecryptfs_daemon *daemon);
void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
int
ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
struct user_namespace *user_ns, struct pid *pid);
int ecryptfs_init_kthread(void);
void ecryptfs_destroy_kthread(void);
int ecryptfs_privileged_open(struct file **lower_file,
struct dentry *lower_dentry,
struct vfsmount *lower_mnt,
const struct cred *cred);
int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode);
void ecryptfs_put_lower_file(struct inode *inode);
int
ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
size_t *packet_size,
struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
char *filename, size_t filename_size);
int
ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
size_t *packet_size,
struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
char *data, size_t max_packet_size);
int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
loff_t offset);
#endif /* #ifndef ECRYPTFS_KERNEL_H */
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