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- Fixes a bug when the lower filesystem mount options include 'acl', but the 

eCryptfs mount options do not
 - Cleanups in the messaging code
 - Better handling of empty files in the lower filesystem to improve usability.
   Failed file creations are now cleaned up and empty lower files are converted
   into eCryptfs during open().
 - The write-through cache changes are being reverted due to bugs that are not
   easy to fix. Stability outweighs the performance enhancements here.
 - Improvement to the mount code to catch unsupported ciphers specified in the
   mount options
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Merge tag 'ecryptfs-3.6-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull ecryptfs fixes from Tyler Hicks:
 - Fixes a bug when the lower filesystem mount options include 'acl',
   but the eCryptfs mount options do not
 - Cleanups in the messaging code
 - Better handling of empty files in the lower filesystem to improve
   usability.  Failed file creations are now cleaned up and empty lower
   files are converted into eCryptfs during open().
 - The write-through cache changes are being reverted due to bugs that
   are not easy to fix.  Stability outweighs the performance
   enhancements here.
 - Improvement to the mount code to catch unsupported ciphers specified
   in the mount options

* tag 'ecryptfs-3.6-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  eCryptfs: check for eCryptfs cipher support at mount
  eCryptfs: Revert to a writethrough cache model
  eCryptfs: Initialize empty lower files when opening them
  eCryptfs: Unlink lower inode when ecryptfs_create() fails
  eCryptfs: Make all miscdev functions use daemon ptr in file private_data
  eCryptfs: Remove unused messaging declarations and function
  eCryptfs: Copy up POSIX ACL and read-only flags from lower mount
This commit is contained in:
Linus Torvalds 2012-08-02 10:56:34 -07:00
parent 630103ea2c 5f5b331d5c
commit 410fc4ce8a
7 changed files with 159 additions and 317 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
fs/ecryptfs/ecryptfs_kernel.h
View File

@ -385,8 +385,6 @@ struct ecryptfs_msg_ctx {
struct mutex mux;
};
struct ecryptfs_daemon;
struct ecryptfs_daemon {
#define ECRYPTFS_DAEMON_IN_READ 0x00000001
#define ECRYPTFS_DAEMON_IN_POLL 0x00000002
@ -394,10 +392,7 @@ struct ecryptfs_daemon {
#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 file *file;
struct mutex mux;
struct list_head msg_ctx_out_queue;
wait_queue_head_t wait;
@ -554,6 +549,8 @@ extern struct kmem_cache *ecryptfs_key_tfm_cache;
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_initialize_file(struct dentry *ecryptfs_dentry,
struct inode *ecryptfs_inode);
int ecryptfs_decode_and_decrypt_filename(char **decrypted_name,
size_t *decrypted_name_size,
struct dentry *ecryptfs_dentry,
@ -607,13 +604,8 @@ 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_process_response(struct ecryptfs_daemon *daemon,
struct ecryptfs_message *msg, 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,
@ -658,8 +650,7 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
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_find_daemon_by_euid(struct ecryptfs_daemon **daemon);
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,
@ -671,8 +662,7 @@ int ecryptfs_send_miscdev(char *data, size_t data_size,
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);
ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file);
int ecryptfs_init_kthread(void);
void ecryptfs_destroy_kthread(void);
int ecryptfs_privileged_open(struct file **lower_file,

92
fs/ecryptfs/file.c
View File

@ -138,29 +138,50 @@ out:
return rc;
}
static void ecryptfs_vma_close(struct vm_area_struct *vma)
{
filemap_write_and_wait(vma->vm_file->f_mapping);
}
struct kmem_cache *ecryptfs_file_info_cache;
static const struct vm_operations_struct ecryptfs_file_vm_ops = {
.close = ecryptfs_vma_close,
.fault = filemap_fault,
};
static int ecryptfs_file_mmap(struct file *file, struct vm_area_struct *vma)
static int read_or_initialize_metadata(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
struct ecryptfs_crypt_stat *crypt_stat;
int rc;
rc = generic_file_mmap(file, vma);
if (!rc)
vma->vm_ops = &ecryptfs_file_vm_ops;
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
mount_crypt_stat = &ecryptfs_superblock_to_private(
inode->i_sb)->mount_crypt_stat;
mutex_lock(&crypt_stat->cs_mutex);
if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
crypt_stat->flags & ECRYPTFS_KEY_VALID) {
rc = 0;
goto out;
}
rc = ecryptfs_read_metadata(dentry);
if (!rc)
goto out;
if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
| ECRYPTFS_ENCRYPTED);
rc = 0;
goto out;
}
if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
!i_size_read(ecryptfs_inode_to_lower(inode))) {
rc = ecryptfs_initialize_file(dentry, inode);
if (!rc)
goto out;
}
rc = -EIO;
out:
mutex_unlock(&crypt_stat->cs_mutex);
return rc;
}
struct kmem_cache *ecryptfs_file_info_cache;
/**
* ecryptfs_open
* @inode: inode speciying file to open
@ -236,32 +257,9 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
rc = 0;
goto out;
}
mutex_lock(&crypt_stat->cs_mutex);
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
|| !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
rc = ecryptfs_read_metadata(ecryptfs_dentry);
if (rc) {
ecryptfs_printk(KERN_DEBUG,
"Valid headers not found\n");
if (!(mount_crypt_stat->flags
& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
rc = -EIO;
printk(KERN_WARNING "Either the lower file "
"is not in a valid eCryptfs format, "
"or the key could not be retrieved. "
"Plaintext passthrough mode is not "
"enabled; returning -EIO\n");
mutex_unlock(&crypt_stat->cs_mutex);
goto out_put;
}
rc = 0;
crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
| ECRYPTFS_ENCRYPTED);
mutex_unlock(&crypt_stat->cs_mutex);
goto out;
}
}
mutex_unlock(&crypt_stat->cs_mutex);
rc = read_or_initialize_metadata(ecryptfs_dentry);
if (rc)
goto out_put;
ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
(unsigned long long)i_size_read(inode));
@ -292,15 +290,7 @@ static int ecryptfs_release(struct inode *inode, struct file *file)
static int
ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
int rc = 0;
rc = generic_file_fsync(file, start, end, datasync);
if (rc)
goto out;
rc = vfs_fsync_range(ecryptfs_file_to_lower(file), start, end,
datasync);
out:
return rc;
return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
}
static int ecryptfs_fasync(int fd, struct file *file, int flag)
@ -369,7 +359,7 @@ const struct file_operations ecryptfs_main_fops = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ecryptfs_compat_ioctl,
#endif
.mmap = ecryptfs_file_mmap,
.mmap = generic_file_mmap,
.open = ecryptfs_open,
.flush = ecryptfs_flush,
.release = ecryptfs_release,

65
fs/ecryptfs/inode.c
View File

@ -143,6 +143,31 @@ static int ecryptfs_interpose(struct dentry *lower_dentry,
return 0;
}
static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
struct inode *inode)
{
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
struct dentry *lower_dir_dentry;
int rc;
dget(lower_dentry);
lower_dir_dentry = lock_parent(lower_dentry);
rc = vfs_unlink(lower_dir_inode, lower_dentry);
if (rc) {
printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
goto out_unlock;
}
fsstack_copy_attr_times(dir, lower_dir_inode);
set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
inode->i_ctime = dir->i_ctime;
d_drop(dentry);
out_unlock:
unlock_dir(lower_dir_dentry);
dput(lower_dentry);
return rc;
}
/**
* ecryptfs_do_create
* @directory_inode: inode of the new file's dentry's parent in ecryptfs
@ -182,8 +207,10 @@ ecryptfs_do_create(struct inode *directory_inode,
}
inode = __ecryptfs_get_inode(lower_dentry->d_inode,
directory_inode->i_sb);
if (IS_ERR(inode))
if (IS_ERR(inode)) {
vfs_unlink(lower_dir_dentry->d_inode, lower_dentry);
goto out_lock;
}
fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
out_lock:
@ -200,8 +227,8 @@ out:
*
* Returns zero on success
*/
static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
struct inode *ecryptfs_inode)
int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
struct inode *ecryptfs_inode)
{
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
@ -264,7 +291,9 @@ ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
* that this on disk file is prepared to be an ecryptfs file */
rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
if (rc) {
drop_nlink(ecryptfs_inode);
ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
ecryptfs_inode);
make_bad_inode(ecryptfs_inode);
unlock_new_inode(ecryptfs_inode);
iput(ecryptfs_inode);
goto out;
@ -466,27 +495,7 @@ out_lock:
static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
struct dentry *lower_dir_dentry;
dget(lower_dentry);
lower_dir_dentry = lock_parent(lower_dentry);
rc = vfs_unlink(lower_dir_inode, lower_dentry);
if (rc) {
printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
goto out_unlock;
}
fsstack_copy_attr_times(dir, lower_dir_inode);
set_nlink(dentry->d_inode,
ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink);
dentry->d_inode->i_ctime = dir->i_ctime;
d_drop(dentry);
out_unlock:
unlock_dir(lower_dir_dentry);
dput(lower_dentry);
return rc;
return ecryptfs_do_unlink(dir, dentry, dentry->d_inode);
}
static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
@ -961,12 +970,6 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
goto out;
}
if (S_ISREG(inode->i_mode)) {
rc = filemap_write_and_wait(inode->i_mapping);
if (rc)
goto out;
fsstack_copy_attr_all(inode, lower_inode);
}
memcpy(&lower_ia, ia, sizeof(lower_ia));
if (ia->ia_valid & ATTR_FILE)
lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);

22
fs/ecryptfs/main.c
View File

@ -279,6 +279,7 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
char *fnek_src;
char *cipher_key_bytes_src;
char *fn_cipher_key_bytes_src;
u8 cipher_code;
*check_ruid = 0;
@ -420,6 +421,18 @@ static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
&& !fn_cipher_key_bytes_set)
mount_crypt_stat->global_default_fn_cipher_key_bytes =
mount_crypt_stat->global_default_cipher_key_size;
cipher_code = ecryptfs_code_for_cipher_string(
mount_crypt_stat->global_default_cipher_name,
mount_crypt_stat->global_default_cipher_key_size);
if (!cipher_code) {
ecryptfs_printk(KERN_ERR,
"eCryptfs doesn't support cipher: %s",
mount_crypt_stat->global_default_cipher_name);
rc = -EINVAL;
goto out;
}
mutex_lock(&key_tfm_list_mutex);
if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
NULL)) {
@ -540,6 +553,15 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
}
ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
/**
* Set the POSIX ACL flag based on whether they're enabled in the lower
* mount. Force a read-only eCryptfs mount if the lower mount is ro.
* Allow a ro eCryptfs mount even when the lower mount is rw.
*/
s->s_flags = flags & ~MS_POSIXACL;
s->s_flags |= path.dentry->d_sb->s_flags & (MS_RDONLY | MS_POSIXACL);
s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
s->s_blocksize = path.dentry->d_sb->s_blocksize;
s->s_magic = ECRYPTFS_SUPER_MAGIC;

136
fs/ecryptfs/messaging.c
View File

@ -32,8 +32,8 @@ static struct mutex ecryptfs_msg_ctx_lists_mux;
static struct hlist_head *ecryptfs_daemon_hash;
struct mutex ecryptfs_daemon_hash_mux;
static int ecryptfs_hash_bits;
#define ecryptfs_uid_hash(uid) \
hash_long((unsigned long)uid, ecryptfs_hash_bits)
#define ecryptfs_current_euid_hash(uid) \
hash_long((unsigned long)current_euid(), ecryptfs_hash_bits)
static u32 ecryptfs_msg_counter;
static struct ecryptfs_msg_ctx *ecryptfs_msg_ctx_arr;
@ -105,26 +105,24 @@ void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
/**
* ecryptfs_find_daemon_by_euid
* @euid: The effective user id which maps to the desired daemon id
* @user_ns: The namespace in which @euid applies
* @daemon: If return value is zero, points to the desired daemon pointer
*
* Must be called with ecryptfs_daemon_hash_mux held.
*
* Search the hash list for the given user id.
* Search the hash list for the current effective user id.
*
* Returns zero if the user id exists in the list; non-zero otherwise.
*/
int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
struct user_namespace *user_ns)
int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon)
{
struct hlist_node *elem;
int rc;
hlist_for_each_entry(*daemon, elem,
&ecryptfs_daemon_hash[ecryptfs_uid_hash(euid)],
euid_chain) {
if ((*daemon)->euid == euid && (*daemon)->user_ns == user_ns) {
&ecryptfs_daemon_hash[ecryptfs_current_euid_hash()],
euid_chain) {
if ((*daemon)->file->f_cred->euid == current_euid() &&
(*daemon)->file->f_cred->user_ns == current_user_ns()) {
rc = 0;
goto out;
}
@ -137,9 +135,7 @@ out:
/**
* ecryptfs_spawn_daemon - Create and initialize a new daemon struct
* @daemon: Pointer to set to newly allocated daemon struct
* @euid: Effective user id for the daemon
* @user_ns: The namespace in which @euid applies
* @pid: Process id for the daemon
* @file: File used when opening /dev/ecryptfs
*
* Must be called ceremoniously while in possession of
* ecryptfs_sacred_daemon_hash_mux
@ -147,8 +143,7 @@ out:
* Returns zero on success; non-zero otherwise
*/
int
ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
struct user_namespace *user_ns, struct pid *pid)
ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, struct file *file)
{
int rc = 0;
@ -159,16 +154,13 @@ ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
"GFP_KERNEL memory\n", __func__, sizeof(**daemon));
goto out;
}
(*daemon)->euid = euid;
(*daemon)->user_ns = get_user_ns(user_ns);
(*daemon)->pid = get_pid(pid);
(*daemon)->task = current;
(*daemon)->file = file;
mutex_init(&(*daemon)->mux);
INIT_LIST_HEAD(&(*daemon)->msg_ctx_out_queue);
init_waitqueue_head(&(*daemon)->wait);
(*daemon)->num_queued_msg_ctx = 0;
hlist_add_head(&(*daemon)->euid_chain,
&ecryptfs_daemon_hash[ecryptfs_uid_hash(euid)]);
&ecryptfs_daemon_hash[ecryptfs_current_euid_hash()]);
out:
return rc;
}
@ -188,9 +180,6 @@ int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon)
if ((daemon->flags & ECRYPTFS_DAEMON_IN_READ)
|| (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)) {
rc = -EBUSY;
printk(KERN_WARNING "%s: Attempt to destroy daemon with pid "
"[0x%p], but it is in the midst of a read or a poll\n",
__func__, daemon->pid);
mutex_unlock(&daemon->mux);
goto out;
}
@ -203,55 +192,16 @@ int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon)
ecryptfs_msg_ctx_alloc_to_free(msg_ctx);
}
hlist_del(&daemon->euid_chain);
if (daemon->task)
wake_up_process(daemon->task);
if (daemon->pid)
put_pid(daemon->pid);
if (daemon->user_ns)
put_user_ns(daemon->user_ns);
mutex_unlock(&daemon->mux);
kzfree(daemon);
out:
return rc;
}
/**
* ecryptfs_process_quit
* @euid: The user ID owner of the message
* @user_ns: The namespace in which @euid applies
* @pid: The process ID for the userspace program that sent the
* message
*
* Deletes the corresponding daemon for the given euid and pid, if
* it is the registered that is requesting the deletion. Returns zero
* after deleting the desired daemon; non-zero otherwise.
*/
int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
struct pid *pid)
{
struct ecryptfs_daemon *daemon;
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
rc = ecryptfs_find_daemon_by_euid(&daemon, euid, user_ns);
if (rc || !daemon) {
rc = -EINVAL;
printk(KERN_ERR "Received request from user [%d] to "
"unregister unrecognized daemon [0x%p]\n", euid, pid);
goto out_unlock;
}
rc = ecryptfs_exorcise_daemon(daemon);
out_unlock:
mutex_unlock(&ecryptfs_daemon_hash_mux);
return rc;
}
/**
* ecryptfs_process_reponse
* @msg: The ecryptfs message received; the caller should sanity check
* msg->data_len and free the memory
* @pid: The process ID of the userspace application that sent the
* message
* @seq: The sequence number of the message; must match the sequence
* number for the existing message context waiting for this
* response
@ -270,16 +220,11 @@ out_unlock:
*
* Returns zero on success; non-zero otherwise
*/
int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
struct user_namespace *user_ns, struct pid *pid,
u32 seq)
int ecryptfs_process_response(struct ecryptfs_daemon *daemon,
struct ecryptfs_message *msg, u32 seq)
{
struct ecryptfs_daemon *uninitialized_var(daemon);
struct ecryptfs_msg_ctx *msg_ctx;
size_t msg_size;
struct nsproxy *nsproxy;
struct user_namespace *tsk_user_ns;
uid_t ctx_euid;
int rc;
if (msg->index >= ecryptfs_message_buf_len) {
@ -292,51 +237,6 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
}
msg_ctx = &ecryptfs_msg_ctx_arr[msg->index];
mutex_lock(&msg_ctx->mux);
mutex_lock(&ecryptfs_daemon_hash_mux);
rcu_read_lock();
nsproxy = task_nsproxy(msg_ctx->task);
if (nsproxy == NULL) {
rc = -EBADMSG;
printk(KERN_ERR "%s: Receiving process is a zombie. Dropping "
"message.\n", __func__);
rcu_read_unlock();
mutex_unlock(&ecryptfs_daemon_hash_mux);
goto wake_up;
}
tsk_user_ns = __task_cred(msg_ctx->task)->user_ns;
ctx_euid = task_euid(msg_ctx->task);
rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, tsk_user_ns);
rcu_read_unlock();
mutex_unlock(&ecryptfs_daemon_hash_mux);
if (rc) {
rc = -EBADMSG;
printk(KERN_WARNING "%s: User [%d] received a "
"message response from process [0x%p] but does "
"not have a registered daemon\n", __func__,
ctx_euid, pid);
goto wake_up;
}
if (ctx_euid != euid) {
rc = -EBADMSG;
printk(KERN_WARNING "%s: Received message from user "
"[%d]; expected message from user [%d]\n", __func__,
euid, ctx_euid);
goto unlock;
}
if (tsk_user_ns != user_ns) {
rc = -EBADMSG;
printk(KERN_WARNING "%s: Received message from user_ns "
"[0x%p]; expected message from user_ns [0x%p]\n",
__func__, user_ns, tsk_user_ns);
goto unlock;
}
if (daemon->pid != pid) {
rc = -EBADMSG;
printk(KERN_ERR "%s: User [%d] sent a message response "
"from an unrecognized process [0x%p]\n",
__func__, ctx_euid, pid);
goto unlock;
}
if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
rc = -EINVAL;
printk(KERN_WARNING "%s: Desired context element is not "
@ -359,9 +259,8 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
}
memcpy(msg_ctx->msg, msg, msg_size);
msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_DONE;
rc = 0;
wake_up:
wake_up_process(msg_ctx->task);
rc = 0;
unlock:
mutex_unlock(&msg_ctx->mux);
out:
@ -383,14 +282,11 @@ ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
struct ecryptfs_msg_ctx **msg_ctx)
{
struct ecryptfs_daemon *daemon;
uid_t euid = current_euid();
int rc;
rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
rc = ecryptfs_find_daemon_by_euid(&daemon);
if (rc || !daemon) {
rc = -ENOTCONN;
printk(KERN_ERR "%s: User [%d] does not have a daemon "
"registered\n", __func__, euid);
goto out;
}
mutex_lock(&ecryptfs_msg_ctx_lists_mux);

98
fs/ecryptfs/miscdev.c
View File

@ -33,7 +33,7 @@ static atomic_t ecryptfs_num_miscdev_opens;
/**
* ecryptfs_miscdev_poll
* @file: dev file (ignored)
* @file: dev file
* @pt: dev poll table (ignored)
*
* Returns the poll mask
@ -41,20 +41,10 @@ static atomic_t ecryptfs_num_miscdev_opens;
static unsigned int
ecryptfs_miscdev_poll(struct file *file, poll_table *pt)
{
struct ecryptfs_daemon *daemon;
struct ecryptfs_daemon *daemon = file->private_data;
unsigned int mask = 0;
uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
/* TODO: Just use file->private_data? */
rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
if (rc || !daemon) {
mutex_unlock(&ecryptfs_daemon_hash_mux);
return -EINVAL;
}
mutex_lock(&daemon->mux);
mutex_unlock(&ecryptfs_daemon_hash_mux);
if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
printk(KERN_WARNING "%s: Attempt to poll on zombified "
"daemon\n", __func__);
@ -79,7 +69,7 @@ out_unlock_daemon:
/**
* ecryptfs_miscdev_open
* @inode: inode of miscdev handle (ignored)
* @file: file for miscdev handle (ignored)
* @file: file for miscdev handle
*
* Returns zero on success; non-zero otherwise
*/
@ -87,7 +77,6 @@ static int
ecryptfs_miscdev_open(struct inode *inode, struct file *file)
{
struct ecryptfs_daemon *daemon = NULL;
uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
@ -98,30 +87,20 @@ ecryptfs_miscdev_open(struct inode *inode, struct file *file)
"count; rc = [%d]\n", __func__, rc);
goto out_unlock_daemon_list;
}
rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
if (rc || !daemon) {
rc = ecryptfs_spawn_daemon(&daemon, euid, current_user_ns(),
task_pid(current));
if (rc) {
printk(KERN_ERR "%s: Error attempting to spawn daemon; "
"rc = [%d]\n", __func__, rc);
goto out_module_put_unlock_daemon_list;
}
rc = ecryptfs_find_daemon_by_euid(&daemon);
if (!rc) {
rc = -EINVAL;
goto out_unlock_daemon_list;
}
rc = ecryptfs_spawn_daemon(&daemon, file);
if (rc) {
printk(KERN_ERR "%s: Error attempting to spawn daemon; "
"rc = [%d]\n", __func__, rc);
goto out_module_put_unlock_daemon_list;
}
mutex_lock(&daemon->mux);
if (daemon->pid != task_pid(current)) {
rc = -EINVAL;
printk(KERN_ERR "%s: pid [0x%p] has registered with euid [%d], "
"but pid [0x%p] has attempted to open the handle "
"instead\n", __func__, daemon->pid, daemon->euid,
task_pid(current));
goto out_unlock_daemon;
}
if (daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN) {
rc = -EBUSY;
printk(KERN_ERR "%s: Miscellaneous device handle may only be "
"opened once per daemon; pid [0x%p] already has this "
"handle open\n", __func__, daemon->pid);
goto out_unlock_daemon;
}
daemon->flags |= ECRYPTFS_DAEMON_MISCDEV_OPEN;
@ -140,7 +119,7 @@ out_unlock_daemon_list:
/**
* ecryptfs_miscdev_release
* @inode: inode of fs/ecryptfs/euid handle (ignored)
* @file: file for fs/ecryptfs/euid handle (ignored)
* @file: file for fs/ecryptfs/euid handle
*
* This keeps the daemon registered until the daemon sends another
* ioctl to fs/ecryptfs/ctl or until the kernel module unregisters.
@ -150,20 +129,18 @@ out_unlock_daemon_list:
static int
ecryptfs_miscdev_release(struct inode *inode, struct file *file)
{
struct ecryptfs_daemon *daemon = NULL;
uid_t euid = current_euid();
struct ecryptfs_daemon *daemon = file->private_data;
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
if (rc || !daemon)
daemon = file->private_data;
mutex_lock(&daemon->mux);
BUG_ON(!(daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN));
daemon->flags &= ~ECRYPTFS_DAEMON_MISCDEV_OPEN;
atomic_dec(&ecryptfs_num_miscdev_opens);
mutex_unlock(&daemon->mux);
mutex_lock(&ecryptfs_daemon_hash_mux);
rc = ecryptfs_exorcise_daemon(daemon);
mutex_unlock(&ecryptfs_daemon_hash_mux);
if (rc) {
printk(KERN_CRIT "%s: Fatal error whilst attempting to "
"shut down daemon; rc = [%d]. Please report this "
@ -171,7 +148,6 @@ ecryptfs_miscdev_release(struct inode *inode, struct file *file)
BUG();
}
module_put(THIS_MODULE);
mutex_unlock(&ecryptfs_daemon_hash_mux);
return rc;
}
@ -248,7 +224,7 @@ int ecryptfs_send_miscdev(char *data, size_t data_size,
/**
* ecryptfs_miscdev_read - format and send message from queue
* @file: fs/ecryptfs/euid miscdevfs handle (ignored)
* @file: miscdevfs handle
* @buf: User buffer into which to copy the next message on the daemon queue
* @count: Amount of space available in @buf
* @ppos: Offset in file (ignored)
@ -262,43 +238,27 @@ static ssize_t
ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
struct ecryptfs_daemon *daemon;
struct ecryptfs_daemon *daemon = file->private_data;
struct ecryptfs_msg_ctx *msg_ctx;
size_t packet_length_size;
char packet_length[ECRYPTFS_MAX_PKT_LEN_SIZE];
size_t i;
size_t total_length;
uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
/* TODO: Just use file->private_data? */
rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
if (rc || !daemon) {
mutex_unlock(&ecryptfs_daemon_hash_mux);
return -EINVAL;
}
mutex_lock(&daemon->mux);
if (task_pid(current) != daemon->pid) {
mutex_unlock(&daemon->mux);
mutex_unlock(&ecryptfs_daemon_hash_mux);
return -EPERM;
}
if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
rc = 0;
mutex_unlock(&ecryptfs_daemon_hash_mux);
printk(KERN_WARNING "%s: Attempt to read from zombified "
"daemon\n", __func__);
goto out_unlock_daemon;
}
if (daemon->flags & ECRYPTFS_DAEMON_IN_READ) {
rc = 0;
mutex_unlock(&ecryptfs_daemon_hash_mux);
goto out_unlock_daemon;
}
/* This daemon will not go away so long as this flag is set */
daemon->flags |= ECRYPTFS_DAEMON_IN_READ;
mutex_unlock(&ecryptfs_daemon_hash_mux);
check_list:
if (list_empty(&daemon->msg_ctx_out_queue)) {
mutex_unlock(&daemon->mux);
@ -382,16 +342,12 @@ out_unlock_daemon:
* ecryptfs_miscdev_response - miscdevess response to message previously sent to daemon
* @data: Bytes comprising struct ecryptfs_message
* @data_size: sizeof(struct ecryptfs_message) + data len
* @euid: Effective user id of miscdevess sending the miscdev response
* @user_ns: The namespace in which @euid applies
* @pid: Miscdevess id of miscdevess sending the miscdev response
* @seq: Sequence number for miscdev response packet
*
* Returns zero on success; non-zero otherwise
*/
static int ecryptfs_miscdev_response(char *data, size_t data_size,
uid_t euid, struct user_namespace *user_ns,
struct pid *pid, u32 seq)
static int ecryptfs_miscdev_response(struct ecryptfs_daemon *daemon, char *data,
size_t data_size, u32 seq)
{
struct ecryptfs_message *msg = (struct ecryptfs_message *)data;
int rc;
@ -403,7 +359,7 @@ static int ecryptfs_miscdev_response(char *data, size_t data_size,
rc = -EINVAL;
goto out;
}
rc = ecryptfs_process_response(msg, euid, user_ns, pid, seq);
rc = ecryptfs_process_response(daemon, msg, seq);
if (rc)
printk(KERN_ERR
"Error processing response message; rc = [%d]\n", rc);
@ -413,7 +369,7 @@ out:
/**
* ecryptfs_miscdev_write - handle write to daemon miscdev handle
* @file: File for misc dev handle (ignored)
* @file: File for misc dev handle
* @buf: Buffer containing user data
* @count: Amount of data in @buf
* @ppos: Pointer to offset in file (ignored)
@ -428,7 +384,6 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
u32 seq;
size_t packet_size, packet_size_length;
char *data;
uid_t euid = current_euid();
unsigned char packet_size_peek[ECRYPTFS_MAX_PKT_LEN_SIZE];
ssize_t rc;
@ -488,10 +443,9 @@ memdup:
}
memcpy(&counter_nbo, &data[PKT_CTR_OFFSET], PKT_CTR_SIZE);
seq = be32_to_cpu(counter_nbo);
rc = ecryptfs_miscdev_response(
rc = ecryptfs_miscdev_response(file->private_data,
&data[PKT_LEN_OFFSET + packet_size_length],
packet_size, euid, current_user_ns(),
task_pid(current), seq);
packet_size, seq);
if (rc) {
printk(KERN_WARNING "%s: Failed to deliver miscdev "
"response to requesting operation; rc = [%zd]\n",

39
fs/ecryptfs/mmap.c
View File

@ -66,18 +66,6 @@ static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc)
{
int rc;
/*
* Refuse to write the page out if we are called from reclaim context
* since our writepage() path may potentially allocate memory when
* calling into the lower fs vfs_write() which may in turn invoke
* us again.
*/
if (current->flags & PF_MEMALLOC) {
redirty_page_for_writepage(wbc, page);
rc = 0;
goto out;
}
rc = ecryptfs_encrypt_page(page);
if (rc) {
ecryptfs_printk(KERN_WARNING, "Error encrypting "
@ -498,7 +486,6 @@ static int ecryptfs_write_end(struct file *file,
struct ecryptfs_crypt_stat *crypt_stat =
&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
int rc;
int need_unlock_page = 1;
ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
"(page w/ index = [0x%.16lx], to = [%d])\n", index, to);
@ -519,26 +506,26 @@ static int ecryptfs_write_end(struct file *file,
"zeros in page with index = [0x%.16lx]\n", index);
goto out;
}
set_page_dirty(page);
unlock_page(page);
need_unlock_page = 0;
rc = ecryptfs_encrypt_page(page);
if (rc) {
ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
"index [0x%.16lx])\n", index);
goto out;
}
if (pos + copied > i_size_read(ecryptfs_inode)) {
i_size_write(ecryptfs_inode, pos + copied);
ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
"[0x%.16llx]\n",
(unsigned long long)i_size_read(ecryptfs_inode));
balance_dirty_pages_ratelimited(mapping);
rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
if (rc) {
printk(KERN_ERR "Error writing inode size to metadata; "
"rc = [%d]\n", rc);
goto out;
}
}
rc = copied;
rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
if (rc)
printk(KERN_ERR "Error writing inode size to metadata; "
"rc = [%d]\n", rc);
else
rc = copied;
out:
if (need_unlock_page)
unlock_page(page);
unlock_page(page);
page_cache_release(page);
return rc;
}