mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Tyler Hicks](/assets/img/avatar_default.png)
Fixes a regression caused by 21edad3220
When file name encryption was enabled, ecryptfs_lookup() failed to use
the encrypted and encoded version of the upper, plaintext, file name
when performing a lookup in the lower file system. This made it
impossible to lookup existing encrypted file names and any newly created
files would have plaintext file names in the lower file system.
https://bugs.launchpad.net/ecryptfs/+bug/623087
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
1234 lines
35 KiB
C
1234 lines
35 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 <linux/slab.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;
|
|
char zero_virt[] = { 0x00 };
|
|
int rc = 0;
|
|
|
|
rc = ecryptfs_write(ecryptfs_inode, 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_put;
|
|
}
|
|
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,
|
|
ECRYPTFS_INTERPOSE_FLAG_D_ADD);
|
|
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) {
|
|
memset(page_virt, 0, PAGE_CACHE_SIZE);
|
|
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->metadata_size
|
|
+ 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_put:
|
|
dput(lower_dentry);
|
|
mntput(lower_mnt);
|
|
d_drop(ecryptfs_dentry);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_new_lower_dentry
|
|
* @name: The name of the new dentry.
|
|
* @lower_dir_dentry: Parent directory of the new dentry.
|
|
* @nd: nameidata from last lookup.
|
|
*
|
|
* Create a new dentry or get it from lower parent dir.
|
|
*/
|
|
static struct dentry *
|
|
ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
struct dentry *new_dentry;
|
|
struct dentry *tmp;
|
|
struct inode *lower_dir_inode;
|
|
|
|
lower_dir_inode = lower_dir_dentry->d_inode;
|
|
|
|
tmp = d_alloc(lower_dir_dentry, name);
|
|
if (!tmp)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_lock(&lower_dir_inode->i_mutex);
|
|
new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd);
|
|
mutex_unlock(&lower_dir_inode->i_mutex);
|
|
|
|
if (!new_dentry)
|
|
new_dentry = tmp;
|
|
else
|
|
dput(tmp);
|
|
|
|
return new_dentry;
|
|
}
|
|
|
|
|
|
/**
|
|
* ecryptfs_lookup_one_lower
|
|
* @ecryptfs_dentry: The eCryptfs dentry that we are looking up
|
|
* @lower_dir_dentry: lower parent directory
|
|
* @name: lower file name
|
|
*
|
|
* Get the lower dentry from vfs. If lower dentry does not exist yet,
|
|
* create it.
|
|
*/
|
|
static struct dentry *
|
|
ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry,
|
|
struct dentry *lower_dir_dentry, struct qstr *name)
|
|
{
|
|
struct nameidata nd;
|
|
struct vfsmount *lower_mnt;
|
|
int err;
|
|
|
|
lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(
|
|
ecryptfs_dentry->d_parent));
|
|
err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd);
|
|
mntput(lower_mnt);
|
|
|
|
if (!err) {
|
|
/* we dont need the mount */
|
|
mntput(nd.path.mnt);
|
|
return nd.path.dentry;
|
|
}
|
|
if (err != -ENOENT)
|
|
return ERR_PTR(err);
|
|
|
|
/* create a new lower dentry */
|
|
return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
struct qstr lower_name;
|
|
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);
|
|
lower_name.name = ecryptfs_dentry->d_name.name;
|
|
lower_name.len = ecryptfs_dentry->d_name.len;
|
|
lower_name.hash = ecryptfs_dentry->d_name.hash;
|
|
if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
|
|
rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
|
|
&lower_name);
|
|
if (rc < 0)
|
|
goto out_d_drop;
|
|
}
|
|
lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
|
|
lower_dir_dentry, &lower_name);
|
|
if (IS_ERR(lower_dentry)) {
|
|
rc = PTR_ERR(lower_dentry);
|
|
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
|
|
"[%d] on lower_dentry = [%s]\n", __func__, rc,
|
|
encrypted_and_encoded_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;
|
|
}
|
|
lower_name.name = encrypted_and_encoded_name;
|
|
lower_name.len = encrypted_and_encoded_name_size;
|
|
lower_name.hash = full_name_hash(lower_name.name, lower_name.len);
|
|
if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) {
|
|
rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry,
|
|
&lower_name);
|
|
if (rc < 0)
|
|
goto out_d_drop;
|
|
}
|
|
lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry,
|
|
lower_dir_dentry, &lower_name);
|
|
if (IS_ERR(lower_dentry)) {
|
|
rc = PTR_ERR(lower_dentry);
|
|
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() 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_dir_dentry->d_inode);
|
|
fsstack_copy_inode_size(dir, lower_dir_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);
|
|
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;
|
|
|
|
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);
|
|
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);
|
|
dput(lower_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;
|
|
struct dentry *trap = NULL;
|
|
|
|
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);
|
|
trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
|
|
/* source should not be ancestor of target */
|
|
if (trap == lower_old_dentry) {
|
|
rc = -EINVAL;
|
|
goto out_lock;
|
|
}
|
|
/* target should not be ancestor of source */
|
|
if (trap == lower_new_dentry) {
|
|
rc = -ENOTEMPTY;
|
|
goto out_lock;
|
|
}
|
|
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);
|
|
if (new_dir != old_dir)
|
|
fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
|
|
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_lower(struct dentry *dentry, char **buf,
|
|
size_t *bufsiz)
|
|
{
|
|
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
char *lower_buf;
|
|
size_t lower_bufsiz = PATH_MAX;
|
|
mm_segment_t old_fs;
|
|
int rc;
|
|
|
|
lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
|
|
if (!lower_buf) {
|
|
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)
|
|
goto out;
|
|
lower_bufsiz = rc;
|
|
rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
|
|
lower_buf, lower_bufsiz);
|
|
out:
|
|
kfree(lower_buf);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
|
|
{
|
|
char *kbuf;
|
|
size_t kbufsiz, copied;
|
|
int rc;
|
|
|
|
rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
|
|
if (rc)
|
|
goto out;
|
|
copied = min_t(size_t, bufsiz, kbufsiz);
|
|
rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
|
|
kfree(kbuf);
|
|
fsstack_copy_attr_atime(dentry->d_inode,
|
|
ecryptfs_dentry_to_lower(dentry)->d_inode);
|
|
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) {
|
|
buf = ERR_PTR(-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) {
|
|
kfree(buf);
|
|
buf = ERR_PTR(rc);
|
|
} else
|
|
buf[rc] = '\0';
|
|
out:
|
|
nd_set_link(nd, buf);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
|
|
{
|
|
char *buf = nd_get_link(nd);
|
|
if (!IS_ERR(buf)) {
|
|
/* Free the char* */
|
|
kfree(buf);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 = ecryptfs_lower_header_size(crypt_stat);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* truncate_upper
|
|
* @dentry: The ecryptfs layer dentry
|
|
* @ia: Address of the ecryptfs inode's attributes
|
|
* @lower_ia: Address of the lower inode's attributes
|
|
*
|
|
* 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 truncate the upper
|
|
* inode and update the lower_ia according to the page index
|
|
* interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
|
|
* the caller must use lower_ia in a call to notify_change() to perform
|
|
* the truncation of the lower inode.
|
|
*
|
|
* Returns zero on success; non-zero otherwise
|
|
*/
|
|
static int truncate_upper(struct dentry *dentry, struct iattr *ia,
|
|
struct iattr *lower_ia)
|
|
{
|
|
int rc = 0;
|
|
struct inode *inode = dentry->d_inode;
|
|
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((ia->ia_size == i_size))) {
|
|
lower_ia->ia_valid &= ~ATTR_SIZE;
|
|
goto out;
|
|
}
|
|
crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
|
|
/* Switch on growing or shrinking file */
|
|
if (ia->ia_size > i_size) {
|
|
char zero[] = { 0x00 };
|
|
|
|
lower_ia->ia_valid &= ~ATTR_SIZE;
|
|
/* 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(inode, zero,
|
|
(ia->ia_size - 1), 1);
|
|
} else { /* ia->ia_size < i_size_read(inode) */
|
|
/* We're chopping off all the pages down to the page
|
|
* in which ia->ia_size is located. Fill in the end of
|
|
* that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
|
|
* PAGE_CACHE_SIZE with zeros. */
|
|
size_t num_zeros = (PAGE_CACHE_SIZE
|
|
- (ia->ia_size & ~PAGE_CACHE_MASK));
|
|
|
|
|
|
/*
|
|
* XXX(truncate) this should really happen at the begginning
|
|
* of ->setattr. But the code is too messy to that as part
|
|
* of a larger patch. ecryptfs is also totally missing out
|
|
* on the inode_change_ok check at the beginning of
|
|
* ->setattr while would include this.
|
|
*/
|
|
rc = inode_newsize_ok(inode, ia->ia_size);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
|
|
truncate_setsize(inode, ia->ia_size);
|
|
lower_ia->ia_size = ia->ia_size;
|
|
lower_ia->ia_valid |= ATTR_SIZE;
|
|
goto out;
|
|
}
|
|
if (num_zeros) {
|
|
char *zeros_virt;
|
|
|
|
zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
|
|
if (!zeros_virt) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
rc = ecryptfs_write(inode, zeros_virt,
|
|
ia->ia_size, 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;
|
|
}
|
|
}
|
|
truncate_setsize(inode, ia->ia_size);
|
|
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;
|
|
}
|
|
/* 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, ia->ia_size);
|
|
if (lower_size_after_truncate < lower_size_before_truncate) {
|
|
lower_ia->ia_size = lower_size_after_truncate;
|
|
lower_ia->ia_valid |= ATTR_SIZE;
|
|
} else
|
|
lower_ia->ia_valid &= ~ATTR_SIZE;
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ecryptfs_truncate
|
|
* @dentry: The ecryptfs layer dentry
|
|
* @new_length: The length to expand the file to
|
|
*
|
|
* Simple function that handles the truncation of an eCryptfs inode and
|
|
* its corresponding lower inode.
|
|
*
|
|
* Returns zero on success; non-zero otherwise
|
|
*/
|
|
int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
|
|
{
|
|
struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
|
|
struct iattr lower_ia = { .ia_valid = 0 };
|
|
int rc;
|
|
|
|
rc = truncate_upper(dentry, &ia, &lower_ia);
|
|
if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
|
|
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
|
|
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = notify_change(lower_dentry, &lower_ia);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
}
|
|
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 iattr lower_ia;
|
|
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);
|
|
memcpy(&lower_ia, ia, sizeof(lower_ia));
|
|
if (ia->ia_valid & ATTR_FILE)
|
|
lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
|
|
if (ia->ia_valid & ATTR_SIZE) {
|
|
rc = truncate_upper(dentry, ia, &lower_ia);
|
|
if (rc < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* mode change is for clearing setuid/setgid bits. Allow lower fs
|
|
* to interpret this in its own way.
|
|
*/
|
|
if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
|
|
lower_ia.ia_valid &= ~ATTR_MODE;
|
|
|
|
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
|
rc = notify_change(lower_dentry, &lower_ia);
|
|
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
|
out:
|
|
fsstack_copy_attr_all(inode, lower_inode);
|
|
return rc;
|
|
}
|
|
|
|
int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
|
|
int rc = 0;
|
|
|
|
mount_crypt_stat = &ecryptfs_superblock_to_private(
|
|
dentry->d_sb)->mount_crypt_stat;
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
|
|
char *target;
|
|
size_t targetsiz;
|
|
|
|
rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
|
|
if (!rc) {
|
|
kfree(target);
|
|
stat->size = targetsiz;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct kstat lower_stat;
|
|
int rc;
|
|
|
|
rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
|
|
ecryptfs_dentry_to_lower(dentry), &lower_stat);
|
|
if (!rc) {
|
|
generic_fillattr(dentry->d_inode, stat);
|
|
stat->blocks = lower_stat.blocks;
|
|
}
|
|
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 = -EOPNOTSUPP;
|
|
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 = -EOPNOTSUPP;
|
|
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 = -EOPNOTSUPP;
|
|
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 = -EOPNOTSUPP;
|
|
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,
|
|
.getattr = ecryptfs_getattr_link,
|
|
.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,
|
|
.getattr = ecryptfs_getattr,
|
|
.setxattr = ecryptfs_setxattr,
|
|
.getxattr = ecryptfs_getxattr,
|
|
.listxattr = ecryptfs_listxattr,
|
|
.removexattr = ecryptfs_removexattr
|
|
};
|