mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Tyler Hicks](/assets/img/avatar_default.png)
When using filename encryption with eCryptfs, the value of the symlink in the lower filesystem is encrypted and stored as a Tag 70 packet. This results in a longer symlink target than if the target value wasn't encrypted. Users were reporting these messages in their syslog: [ 45.653441] ecryptfs_parse_tag_70_packet: max_packet_size is [56]; real packet size is [51] [ 45.653444] ecryptfs_decode_and_decrypt_filename: Could not parse tag 70 packet from filename; copying through filename as-is This was due to bufsiz, one the arguments in readlink(), being used to when allocating the buffer passed to the lower inode's readlink(). That symlink target may be very large, but when decoded and decrypted, could end up being smaller than bufsize. To fix this, the buffer passed to the lower inode's readlink() will always be PATH_MAX in size when filename encryption is enabled. Any necessary truncation occurs after the decoding and decrypting. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
1105 lines
32 KiB
C
1105 lines
32 KiB
C
/**
|
|
* eCryptfs: Linux filesystem encryption layer
|
|
*
|
|
* Copyright (C) 1997-2004 Erez Zadok
|
|
* Copyright (C) 2001-2004 Stony Brook University
|
|
* Copyright (C) 2004-2007 International Business Machines Corp.
|
|
* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
|
|
* Michael C. Thompsion <mcthomps@us.ibm.com>
|
|
*
|
|
* 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/file.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/dcache.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/fs_stack.h>
|
|
#include <asm/unaligned.h>
|
|
#include "ecryptfs_kernel.h"
|
|
|
|
static struct dentry *lock_parent(struct dentry *dentry)
|
|
{
|
|
struct dentry *dir;
|
|
|
|
dir = dget_parent(dentry);
|
|
mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
|
|
return dir;
|
|
}
|
|
|
|
static void unlock_dir(struct dentry *dir)
|
|
{
|
|
mutex_unlock(&dir->d_inode->i_mutex);
|
|
dput(dir);
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_create_underlying_file
|
|
* @lower_dir_inode: inode of the parent in the lower fs of the new file
|
|
* @dentry: New file's dentry
|
|
* @mode: The mode of the new file
|
|
* @nd: nameidata of ecryptfs' parent's dentry & vfsmount
|
|
*
|
|
* Creates the file in the lower file system.
|
|
*
|
|
* Returns zero on success; non-zero on error condition
|
|
*/
|
|
static int
|
|
ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
|
|
struct dentry *dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
|
|
struct dentry *dentry_save;
|
|
struct vfsmount *vfsmount_save;
|
|
int rc;
|
|
|
|
dentry_save = nd->path.dentry;
|
|
vfsmount_save = nd->path.mnt;
|
|
nd->path.dentry = lower_dentry;
|
|
nd->path.mnt = lower_mnt;
|
|
rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
|
|
nd->path.dentry = dentry_save;
|
|
nd->path.mnt = vfsmount_save;
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_do_create
|
|
* @directory_inode: inode of the new file's dentry's parent in ecryptfs
|
|
* @ecryptfs_dentry: New file's dentry in ecryptfs
|
|
* @mode: The mode of the new file
|
|
* @nd: nameidata of ecryptfs' parent's dentry & vfsmount
|
|
*
|
|
* Creates the underlying file and the eCryptfs inode which will link to
|
|
* it. It will also update the eCryptfs directory inode to mimic the
|
|
* stat of the lower directory inode.
|
|
*
|
|
* Returns zero on success; non-zero on error condition
|
|
*/
|
|
static int
|
|
ecryptfs_do_create(struct inode *directory_inode,
|
|
struct dentry *ecryptfs_dentry, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
if (IS_ERR(lower_dir_dentry)) {
|
|
ecryptfs_printk(KERN_ERR, "Error locking directory of "
|
|
"dentry\n");
|
|
rc = PTR_ERR(lower_dir_dentry);
|
|
goto out;
|
|
}
|
|
rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
|
|
ecryptfs_dentry, mode, nd);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
|
|
"rc = [%d]\n", __func__, rc);
|
|
goto out_lock;
|
|
}
|
|
rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
|
|
directory_inode->i_sb, 0);
|
|
if (rc) {
|
|
ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
|
|
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:
|
|
unlock_dir(lower_dir_dentry);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* grow_file
|
|
* @ecryptfs_dentry: the eCryptfs dentry
|
|
*
|
|
* This is the code which will grow the file to its correct size.
|
|
*/
|
|
static int grow_file(struct dentry *ecryptfs_dentry)
|
|
{
|
|
struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
|
|
struct file fake_file;
|
|
struct ecryptfs_file_info tmp_file_info;
|
|
char zero_virt[] = { 0x00 };
|
|
int rc = 0;
|
|
|
|
memset(&fake_file, 0, sizeof(fake_file));
|
|
fake_file.f_path.dentry = ecryptfs_dentry;
|
|
memset(&tmp_file_info, 0, sizeof(tmp_file_info));
|
|
ecryptfs_set_file_private(&fake_file, &tmp_file_info);
|
|
ecryptfs_set_file_lower(
|
|
&fake_file,
|
|
ecryptfs_inode_to_private(ecryptfs_inode)->lower_file);
|
|
rc = ecryptfs_write(&fake_file, zero_virt, 0, 1);
|
|
i_size_write(ecryptfs_inode, 0);
|
|
rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
|
|
ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |=
|
|
ECRYPTFS_NEW_FILE;
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_initialize_file
|
|
*
|
|
* Cause the file to be changed from a basic empty file to an ecryptfs
|
|
* file with a header and first data page.
|
|
*
|
|
* Returns zero on success
|
|
*/
|
|
static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
|
|
{
|
|
struct ecryptfs_crypt_stat *crypt_stat =
|
|
&ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
|
|
int rc = 0;
|
|
|
|
if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
|
|
ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
|
|
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
|
|
goto out;
|
|
}
|
|
crypt_stat->flags |= ECRYPTFS_NEW_FILE;
|
|
ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
|
|
rc = ecryptfs_new_file_context(ecryptfs_dentry);
|
|
if (rc) {
|
|
ecryptfs_printk(KERN_ERR, "Error creating new file "
|
|
"context; rc = [%d]\n", rc);
|
|
goto out;
|
|
}
|
|
if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
|
|
rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to initialize "
|
|
"the persistent file for the dentry with name "
|
|
"[%s]; rc = [%d]\n", __func__,
|
|
ecryptfs_dentry->d_name.name, rc);
|
|
goto out;
|
|
}
|
|
}
|
|
rc = ecryptfs_write_metadata(ecryptfs_dentry);
|
|
if (rc) {
|
|
printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
|
|
goto out;
|
|
}
|
|
rc = grow_file(ecryptfs_dentry);
|
|
if (rc)
|
|
printk(KERN_ERR "Error growing file; rc = [%d]\n", rc);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_create
|
|
* @dir: The inode of the directory in which to create the file.
|
|
* @dentry: The eCryptfs dentry
|
|
* @mode: The mode of the new file.
|
|
* @nd: nameidata
|
|
*
|
|
* Creates a new file.
|
|
*
|
|
* Returns zero on success; non-zero on error condition
|
|
*/
|
|
static int
|
|
ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
|
|
int mode, struct nameidata *nd)
|
|
{
|
|
int rc;
|
|
|
|
/* ecryptfs_do_create() calls ecryptfs_interpose() */
|
|
rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd);
|
|
if (unlikely(rc)) {
|
|
ecryptfs_printk(KERN_WARNING, "Failed to create file in"
|
|
"lower filesystem\n");
|
|
goto out;
|
|
}
|
|
/* At this point, a file exists on "disk"; we need to make sure
|
|
* that this on disk file is prepared to be an ecryptfs file */
|
|
rc = ecryptfs_initialize_file(ecryptfs_dentry);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_lookup_and_interpose_lower - Perform a lookup
|
|
*/
|
|
int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
|
|
struct dentry *lower_dentry,
|
|
struct inode *ecryptfs_dir_inode,
|
|
struct nameidata *ecryptfs_nd)
|
|
{
|
|
struct dentry *lower_dir_dentry;
|
|
struct vfsmount *lower_mnt;
|
|
struct inode *lower_inode;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
struct ecryptfs_crypt_stat *crypt_stat;
|
|
char *page_virt = NULL;
|
|
u64 file_size;
|
|
int rc = 0;
|
|
|
|
lower_dir_dentry = lower_dentry->d_parent;
|
|
lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
|
|
ecryptfs_dentry->d_parent));
|
|
lower_inode = lower_dentry->d_inode;
|
|
fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode);
|
|
BUG_ON(!atomic_read(&lower_dentry->d_count));
|
|
ecryptfs_set_dentry_private(ecryptfs_dentry,
|
|
kmem_cache_alloc(ecryptfs_dentry_info_cache,
|
|
GFP_KERNEL));
|
|
if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) {
|
|
rc = -ENOMEM;
|
|
printk(KERN_ERR "%s: Out of memory whilst attempting "
|
|
"to allocate ecryptfs_dentry_info struct\n",
|
|
__func__);
|
|
goto out_dput;
|
|
}
|
|
ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
|
|
ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
|
|
if (!lower_dentry->d_inode) {
|
|
/* We want to add because we couldn't find in lower */
|
|
d_add(ecryptfs_dentry, NULL);
|
|
goto out;
|
|
}
|
|
rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
|
|
ecryptfs_dir_inode->i_sb, 1);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
|
|
__func__, rc);
|
|
goto out;
|
|
}
|
|
if (S_ISDIR(lower_inode->i_mode))
|
|
goto out;
|
|
if (S_ISLNK(lower_inode->i_mode))
|
|
goto out;
|
|
if (special_file(lower_inode->i_mode))
|
|
goto out;
|
|
if (!ecryptfs_nd)
|
|
goto out;
|
|
/* Released in this function */
|
|
page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER);
|
|
if (!page_virt) {
|
|
printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n",
|
|
__func__);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) {
|
|
rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to initialize "
|
|
"the persistent file for the dentry with name "
|
|
"[%s]; rc = [%d]\n", __func__,
|
|
ecryptfs_dentry->d_name.name, rc);
|
|
goto out_free_kmem;
|
|
}
|
|
}
|
|
crypt_stat = &ecryptfs_inode_to_private(
|
|
ecryptfs_dentry->d_inode)->crypt_stat;
|
|
/* TODO: lock for crypt_stat comparison */
|
|
if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
|
|
ecryptfs_set_default_sizes(crypt_stat);
|
|
rc = ecryptfs_read_and_validate_header_region(page_virt,
|
|
ecryptfs_dentry->d_inode);
|
|
if (rc) {
|
|
rc = ecryptfs_read_and_validate_xattr_region(page_virt,
|
|
ecryptfs_dentry);
|
|
if (rc) {
|
|
rc = 0;
|
|
goto out_free_kmem;
|
|
}
|
|
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
|
|
}
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
ecryptfs_dentry->d_sb)->mount_crypt_stat;
|
|
if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
|
|
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
|
|
file_size = (crypt_stat->num_header_bytes_at_front
|
|
+ i_size_read(lower_dentry->d_inode));
|
|
else
|
|
file_size = i_size_read(lower_dentry->d_inode);
|
|
} else {
|
|
file_size = get_unaligned_be64(page_virt);
|
|
}
|
|
i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size);
|
|
out_free_kmem:
|
|
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
|
|
goto out;
|
|
out_dput:
|
|
dput(lower_dentry);
|
|
d_drop(ecryptfs_dentry);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_lookup
|
|
* @ecryptfs_dir_inode: The eCryptfs directory inode
|
|
* @ecryptfs_dentry: The eCryptfs dentry that we are looking up
|
|
* @ecryptfs_nd: nameidata; may be NULL
|
|
*
|
|
* Find a file on disk. If the file does not exist, then we'll add it to the
|
|
* dentry cache and continue on to read it from the disk.
|
|
*/
|
|
static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
|
|
struct dentry *ecryptfs_dentry,
|
|
struct nameidata *ecryptfs_nd)
|
|
{
|
|
char *encrypted_and_encoded_name = NULL;
|
|
size_t encrypted_and_encoded_name_size;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
|
|
struct dentry *lower_dir_dentry, *lower_dentry;
|
|
int rc = 0;
|
|
|
|
ecryptfs_dentry->d_op = &ecryptfs_dops;
|
|
if ((ecryptfs_dentry->d_name.len == 1
|
|
&& !strcmp(ecryptfs_dentry->d_name.name, "."))
|
|
|| (ecryptfs_dentry->d_name.len == 2
|
|
&& !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
|
|
goto out_d_drop;
|
|
}
|
|
lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
|
|
mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
|
|
lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
|
|
lower_dir_dentry,
|
|
ecryptfs_dentry->d_name.len);
|
|
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
|
|
if (IS_ERR(lower_dentry)) {
|
|
rc = PTR_ERR(lower_dentry);
|
|
printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
|
|
"lower_dentry = [%s]\n", __func__, rc,
|
|
ecryptfs_dentry->d_name.name);
|
|
goto out_d_drop;
|
|
}
|
|
if (lower_dentry->d_inode)
|
|
goto lookup_and_interpose;
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
ecryptfs_dentry->d_sb)->mount_crypt_stat;
|
|
if (!(mount_crypt_stat
|
|
&& (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
|
|
goto lookup_and_interpose;
|
|
dput(lower_dentry);
|
|
rc = ecryptfs_encrypt_and_encode_filename(
|
|
&encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
|
|
NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
|
|
ecryptfs_dentry->d_name.len);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to encrypt and encode "
|
|
"filename; rc = [%d]\n", __func__, rc);
|
|
goto out_d_drop;
|
|
}
|
|
mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
|
|
lower_dentry = lookup_one_len(encrypted_and_encoded_name,
|
|
lower_dir_dentry,
|
|
encrypted_and_encoded_name_size - 1);
|
|
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
|
|
if (IS_ERR(lower_dentry)) {
|
|
rc = PTR_ERR(lower_dentry);
|
|
printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
|
|
"lower_dentry = [%s]\n", __func__, rc,
|
|
encrypted_and_encoded_name);
|
|
goto out_d_drop;
|
|
}
|
|
lookup_and_interpose:
|
|
rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
|
|
ecryptfs_dir_inode,
|
|
ecryptfs_nd);
|
|
goto out;
|
|
out_d_drop:
|
|
d_drop(ecryptfs_dentry);
|
|
out:
|
|
kfree(encrypted_and_encoded_name);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *new_dentry)
|
|
{
|
|
struct dentry *lower_old_dentry;
|
|
struct dentry *lower_new_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
u64 file_size_save;
|
|
int rc;
|
|
|
|
file_size_save = i_size_read(old_dentry->d_inode);
|
|
lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
|
|
lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
|
|
dget(lower_old_dentry);
|
|
dget(lower_new_dentry);
|
|
lower_dir_dentry = lock_parent(lower_new_dentry);
|
|
rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
|
|
lower_new_dentry);
|
|
if (rc || !lower_new_dentry->d_inode)
|
|
goto out_lock;
|
|
rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out_lock;
|
|
fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
|
|
old_dentry->d_inode->i_nlink =
|
|
ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
|
|
i_size_write(new_dentry->d_inode, file_size_save);
|
|
out_lock:
|
|
unlock_dir(lower_dir_dentry);
|
|
dput(lower_new_dentry);
|
|
dput(lower_old_dentry);
|
|
d_drop(lower_old_dentry);
|
|
d_drop(new_dentry);
|
|
d_drop(old_dentry);
|
|
return rc;
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
dentry->d_inode->i_nlink =
|
|
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);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *symname)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
char *encoded_symname;
|
|
size_t encoded_symlen;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
dget(lower_dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dir->i_sb)->mount_crypt_stat;
|
|
rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
|
|
&encoded_symlen,
|
|
NULL,
|
|
mount_crypt_stat, symname,
|
|
strlen(symname));
|
|
if (rc)
|
|
goto out_lock;
|
|
rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
|
|
encoded_symname);
|
|
kfree(encoded_symname);
|
|
if (rc || !lower_dentry->d_inode)
|
|
goto out_lock;
|
|
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out_lock;
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
|
|
out_lock:
|
|
unlock_dir(lower_dir_dentry);
|
|
dput(lower_dentry);
|
|
if (!dentry->d_inode)
|
|
d_drop(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
|
|
if (rc || !lower_dentry->d_inode)
|
|
goto out;
|
|
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out;
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
|
|
dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
|
|
out:
|
|
unlock_dir(lower_dir_dentry);
|
|
if (!dentry->d_inode)
|
|
d_drop(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
int rc;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
dget(dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
dget(lower_dentry);
|
|
rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
|
|
dput(lower_dentry);
|
|
if (!rc)
|
|
d_delete(lower_dentry);
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
|
|
unlock_dir(lower_dir_dentry);
|
|
if (!rc)
|
|
d_drop(dentry);
|
|
dput(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_dentry;
|
|
struct dentry *lower_dir_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
lower_dir_dentry = lock_parent(lower_dentry);
|
|
rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
|
|
if (rc || !lower_dentry->d_inode)
|
|
goto out;
|
|
rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0);
|
|
if (rc)
|
|
goto out;
|
|
fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
|
|
out:
|
|
unlock_dir(lower_dir_dentry);
|
|
if (!dentry->d_inode)
|
|
d_drop(dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
int rc;
|
|
struct dentry *lower_old_dentry;
|
|
struct dentry *lower_new_dentry;
|
|
struct dentry *lower_old_dir_dentry;
|
|
struct dentry *lower_new_dir_dentry;
|
|
|
|
lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
|
|
lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
|
|
dget(lower_old_dentry);
|
|
dget(lower_new_dentry);
|
|
lower_old_dir_dentry = dget_parent(lower_old_dentry);
|
|
lower_new_dir_dentry = dget_parent(lower_new_dentry);
|
|
lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
|
|
lower_new_dir_dentry->d_inode, lower_new_dentry);
|
|
if (rc)
|
|
goto out_lock;
|
|
fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL);
|
|
if (new_dir != old_dir)
|
|
fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL);
|
|
out_lock:
|
|
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
dput(lower_new_dentry->d_parent);
|
|
dput(lower_old_dentry->d_parent);
|
|
dput(lower_new_dentry);
|
|
dput(lower_old_dentry);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
|
|
{
|
|
char *lower_buf;
|
|
size_t lower_bufsiz;
|
|
struct dentry *lower_dentry;
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
char *plaintext_name;
|
|
size_t plaintext_name_size;
|
|
mm_segment_t old_fs;
|
|
int rc;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->readlink) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dentry->d_sb)->mount_crypt_stat;
|
|
/*
|
|
* If the lower filename is encrypted, it will result in a significantly
|
|
* longer name. If needed, truncate the name after decode and decrypt.
|
|
*/
|
|
if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
|
|
lower_bufsiz = PATH_MAX;
|
|
else
|
|
lower_bufsiz = bufsiz;
|
|
/* Released in this function */
|
|
lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
|
|
if (lower_buf == NULL) {
|
|
printk(KERN_ERR "%s: Out of memory whilst attempting to "
|
|
"kmalloc [%d] bytes\n", __func__, lower_bufsiz);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
old_fs = get_fs();
|
|
set_fs(get_ds());
|
|
rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
|
|
(char __user *)lower_buf,
|
|
lower_bufsiz);
|
|
set_fs(old_fs);
|
|
if (rc >= 0) {
|
|
rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name,
|
|
&plaintext_name_size,
|
|
dentry, lower_buf,
|
|
rc);
|
|
if (rc) {
|
|
printk(KERN_ERR "%s: Error attempting to decode and "
|
|
"decrypt filename; rc = [%d]\n", __func__,
|
|
rc);
|
|
goto out_free_lower_buf;
|
|
}
|
|
/* Check for bufsiz <= 0 done in sys_readlinkat() */
|
|
rc = copy_to_user(buf, plaintext_name,
|
|
min((unsigned) bufsiz, plaintext_name_size));
|
|
if (rc)
|
|
rc = -EFAULT;
|
|
else
|
|
rc = plaintext_name_size;
|
|
kfree(plaintext_name);
|
|
fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode);
|
|
}
|
|
out_free_lower_buf:
|
|
kfree(lower_buf);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
{
|
|
char *buf;
|
|
int len = PAGE_SIZE, rc;
|
|
mm_segment_t old_fs;
|
|
|
|
/* Released in ecryptfs_put_link(); only release here on error */
|
|
buf = kmalloc(len, GFP_KERNEL);
|
|
if (!buf) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
old_fs = get_fs();
|
|
set_fs(get_ds());
|
|
rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
|
|
set_fs(old_fs);
|
|
if (rc < 0)
|
|
goto out_free;
|
|
else
|
|
buf[rc] = '\0';
|
|
rc = 0;
|
|
nd_set_link(nd, buf);
|
|
goto out;
|
|
out_free:
|
|
kfree(buf);
|
|
out:
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static void
|
|
ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
|
|
{
|
|
/* Free the char* */
|
|
kfree(nd_get_link(nd));
|
|
}
|
|
|
|
/**
|
|
* upper_size_to_lower_size
|
|
* @crypt_stat: Crypt_stat associated with file
|
|
* @upper_size: Size of the upper file
|
|
*
|
|
* Calculate the required size of the lower file based on the
|
|
* specified size of the upper file. This calculation is based on the
|
|
* number of headers in the underlying file and the extent size.
|
|
*
|
|
* Returns Calculated size of the lower file.
|
|
*/
|
|
static loff_t
|
|
upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
|
|
loff_t upper_size)
|
|
{
|
|
loff_t lower_size;
|
|
|
|
lower_size = crypt_stat->num_header_bytes_at_front;
|
|
if (upper_size != 0) {
|
|
loff_t num_extents;
|
|
|
|
num_extents = upper_size >> crypt_stat->extent_shift;
|
|
if (upper_size & ~crypt_stat->extent_mask)
|
|
num_extents++;
|
|
lower_size += (num_extents * crypt_stat->extent_size);
|
|
}
|
|
return lower_size;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_truncate
|
|
* @dentry: The ecryptfs layer dentry
|
|
* @new_length: The length to expand the file to
|
|
*
|
|
* Function to handle truncations modifying the size of the file. Note
|
|
* that the file sizes are interpolated. When expanding, we are simply
|
|
* writing strings of 0's out. When truncating, we need to modify the
|
|
* underlying file size according to the page index interpolations.
|
|
*
|
|
* Returns zero on success; non-zero otherwise
|
|
*/
|
|
int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
|
|
{
|
|
int rc = 0;
|
|
struct inode *inode = dentry->d_inode;
|
|
struct dentry *lower_dentry;
|
|
struct file fake_ecryptfs_file;
|
|
struct ecryptfs_crypt_stat *crypt_stat;
|
|
loff_t i_size = i_size_read(inode);
|
|
loff_t lower_size_before_truncate;
|
|
loff_t lower_size_after_truncate;
|
|
|
|
if (unlikely((new_length == i_size)))
|
|
goto out;
|
|
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
|
|
/* Set up a fake ecryptfs file, this is used to interface with
|
|
* the file in the underlying filesystem so that the
|
|
* truncation has an effect there as well. */
|
|
memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file));
|
|
fake_ecryptfs_file.f_path.dentry = dentry;
|
|
/* Released at out_free: label */
|
|
ecryptfs_set_file_private(&fake_ecryptfs_file,
|
|
kmem_cache_alloc(ecryptfs_file_info_cache,
|
|
GFP_KERNEL));
|
|
if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
ecryptfs_set_file_lower(
|
|
&fake_ecryptfs_file,
|
|
ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
|
|
/* Switch on growing or shrinking file */
|
|
if (new_length > i_size) {
|
|
char zero[] = { 0x00 };
|
|
|
|
/* Write a single 0 at the last position of the file;
|
|
* this triggers code that will fill in 0's throughout
|
|
* the intermediate portion of the previous end of the
|
|
* file and the new and of the file */
|
|
rc = ecryptfs_write(&fake_ecryptfs_file, zero,
|
|
(new_length - 1), 1);
|
|
} else { /* new_length < i_size_read(inode) */
|
|
/* We're chopping off all the pages down do the page
|
|
* in which new_length is located. Fill in the end of
|
|
* that page from (new_length & ~PAGE_CACHE_MASK) to
|
|
* PAGE_CACHE_SIZE with zeros. */
|
|
size_t num_zeros = (PAGE_CACHE_SIZE
|
|
- (new_length & ~PAGE_CACHE_MASK));
|
|
|
|
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
|
|
rc = vmtruncate(inode, new_length);
|
|
if (rc)
|
|
goto out_free;
|
|
rc = vmtruncate(lower_dentry->d_inode, new_length);
|
|
goto out_free;
|
|
}
|
|
if (num_zeros) {
|
|
char *zeros_virt;
|
|
|
|
zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
|
|
if (!zeros_virt) {
|
|
rc = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
|
|
new_length, num_zeros);
|
|
kfree(zeros_virt);
|
|
if (rc) {
|
|
printk(KERN_ERR "Error attempting to zero out "
|
|
"the remainder of the end page on "
|
|
"reducing truncate; rc = [%d]\n", rc);
|
|
goto out_free;
|
|
}
|
|
}
|
|
vmtruncate(inode, new_length);
|
|
rc = ecryptfs_write_inode_size_to_metadata(inode);
|
|
if (rc) {
|
|
printk(KERN_ERR "Problem with "
|
|
"ecryptfs_write_inode_size_to_metadata; "
|
|
"rc = [%d]\n", rc);
|
|
goto out_free;
|
|
}
|
|
/* We are reducing the size of the ecryptfs file, and need to
|
|
* know if we need to reduce the size of the lower file. */
|
|
lower_size_before_truncate =
|
|
upper_size_to_lower_size(crypt_stat, i_size);
|
|
lower_size_after_truncate =
|
|
upper_size_to_lower_size(crypt_stat, new_length);
|
|
if (lower_size_after_truncate < lower_size_before_truncate)
|
|
vmtruncate(lower_dentry->d_inode,
|
|
lower_size_after_truncate);
|
|
}
|
|
out_free:
|
|
if (ecryptfs_file_to_private(&fake_ecryptfs_file))
|
|
kmem_cache_free(ecryptfs_file_info_cache,
|
|
ecryptfs_file_to_private(&fake_ecryptfs_file));
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_permission(struct inode *inode, int mask)
|
|
{
|
|
return inode_permission(ecryptfs_inode_to_lower(inode), mask);
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_setattr
|
|
* @dentry: dentry handle to the inode to modify
|
|
* @ia: Structure with flags of what to change and values
|
|
*
|
|
* Updates the metadata of an inode. If the update is to the size
|
|
* i.e. truncation, then ecryptfs_truncate will handle the size modification
|
|
* of both the ecryptfs inode and the lower inode.
|
|
*
|
|
* All other metadata changes will be passed right to the lower filesystem,
|
|
* and we will just update our inode to look like the lower.
|
|
*/
|
|
static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
struct inode *inode;
|
|
struct inode *lower_inode;
|
|
struct ecryptfs_crypt_stat *crypt_stat;
|
|
|
|
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
|
|
if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
|
|
ecryptfs_init_crypt_stat(crypt_stat);
|
|
inode = dentry->d_inode;
|
|
lower_inode = ecryptfs_inode_to_lower(inode);
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
mutex_lock(&crypt_stat->cs_mutex);
|
|
if (S_ISDIR(dentry->d_inode->i_mode))
|
|
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
|
|
else if (S_ISREG(dentry->d_inode->i_mode)
|
|
&& (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
|
|
|| !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dentry->d_sb)->mount_crypt_stat;
|
|
rc = ecryptfs_read_metadata(dentry);
|
|
if (rc) {
|
|
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;
|
|
}
|
|
rc = 0;
|
|
crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
|
|
}
|
|
}
|
|
mutex_unlock(&crypt_stat->cs_mutex);
|
|
if (ia->ia_valid & ATTR_SIZE) {
|
|
ecryptfs_printk(KERN_DEBUG,
|
|
"ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n",
|
|
ia->ia_valid, ATTR_SIZE);
|
|
rc = ecryptfs_truncate(dentry, ia->ia_size);
|
|
/* ecryptfs_truncate handles resizing of the lower file */
|
|
ia->ia_valid &= ~ATTR_SIZE;
|
|
ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n",
|
|
ia->ia_valid);
|
|
if (rc < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* mode change is for clearing setuid/setgid bits. Allow lower fs
|
|
* to interpret this in its own way.
|
|
*/
|
|
if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
|
|
ia->ia_valid &= ~ATTR_MODE;
|
|
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = notify_change(lower_dentry, ia);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
fsstack_copy_attr_all(inode, lower_inode, NULL);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
|
|
size_t size, int flags)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->setxattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value,
|
|
size, flags);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
ssize_t
|
|
ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
|
|
void *value, size_t size)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (!lower_dentry->d_inode->i_op->getxattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
|
|
size);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t
|
|
ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
|
|
size_t size)
|
|
{
|
|
return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
|
|
value, size);
|
|
}
|
|
|
|
static ssize_t
|
|
ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->listxattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
|
|
{
|
|
int rc = 0;
|
|
struct dentry *lower_dentry;
|
|
|
|
lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
if (!lower_dentry->d_inode->i_op->removexattr) {
|
|
rc = -ENOSYS;
|
|
goto out;
|
|
}
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode)
|
|
{
|
|
if ((ecryptfs_inode_to_lower(inode)
|
|
== (struct inode *)candidate_lower_inode))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int ecryptfs_inode_set(struct inode *inode, void *lower_inode)
|
|
{
|
|
ecryptfs_init_inode(inode, (struct inode *)lower_inode);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations ecryptfs_symlink_iops = {
|
|
.readlink = ecryptfs_readlink,
|
|
.follow_link = ecryptfs_follow_link,
|
|
.put_link = ecryptfs_put_link,
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|
|
|
|
const struct inode_operations ecryptfs_dir_iops = {
|
|
.create = ecryptfs_create,
|
|
.lookup = ecryptfs_lookup,
|
|
.link = ecryptfs_link,
|
|
.unlink = ecryptfs_unlink,
|
|
.symlink = ecryptfs_symlink,
|
|
.mkdir = ecryptfs_mkdir,
|
|
.rmdir = ecryptfs_rmdir,
|
|
.mknod = ecryptfs_mknod,
|
|
.rename = ecryptfs_rename,
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|
|
|
|
const struct inode_operations ecryptfs_main_iops = {
|
|
.permission = ecryptfs_permission,
|
|
.setattr = ecryptfs_setattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|