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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…
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…/git/ecryptfs/ecryptfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  ecryptfs: use after free
  ecryptfs: Eliminate useless code
  ecryptfs: fix interpose/interpolate typos in comments
  ecryptfs: pass matching flags to interpose as defined and used there
  ecryptfs: remove unnecessary d_drop calls in ecryptfs_link
  ecryptfs: don't ignore return value from lock_rename
  ecryptfs: initialize private persistent file before dereferencing pointer
  eCryptfs: Remove mmap from directory operations
  eCryptfs: Add getattr function
  eCryptfs: Use notify_change for truncating lower inodes
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@torvalds
torvalds committed Jan 21, 2010
2 parents 30a0f5e + ece550f commit 15e551e
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Showing 4 changed files with 109 additions and 50 deletions.
4 changes: 2 additions & 2 deletions fs/ecryptfs/crypto.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1748,7 +1748,7 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
char *cipher_name, size_t *key_size)
{
char dummy_key[ECRYPTFS_MAX_KEY_BYTES];
char *full_alg_name;
char *full_alg_name = NULL;
int rc;

*key_tfm = NULL;
Expand All @@ -1763,7 +1763,6 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
if (rc)
goto out;
*key_tfm = crypto_alloc_blkcipher(full_alg_name, 0, CRYPTO_ALG_ASYNC);
kfree(full_alg_name);
if (IS_ERR(*key_tfm)) {
rc = PTR_ERR(*key_tfm);
printk(KERN_ERR "Unable to allocate crypto cipher with name "
Expand All @@ -1786,6 +1785,7 @@ ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
goto out;
}
out:
kfree(full_alg_name);
return rc;
}

Expand Down
17 changes: 8 additions & 9 deletions fs/ecryptfs/file.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,7 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
struct dentry *ecryptfs_dentry = file->f_path.dentry;
/* Private value of ecryptfs_dentry allocated in
* ecryptfs_lookup() */
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
struct dentry *lower_dentry;
struct ecryptfs_file_info *file_info;

mount_crypt_stat = &ecryptfs_superblock_to_private(
Expand Down Expand Up @@ -191,13 +191,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
| ECRYPTFS_ENCRYPTED);
}
mutex_unlock(&crypt_stat->cs_mutex);
if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
&& !(file->f_flags & O_RDONLY)) {
rc = -EPERM;
printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
"file must hence be opened RO\n", __func__);
goto out;
}
if (!ecryptfs_inode_to_private(inode)->lower_file) {
rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
if (rc) {
Expand All @@ -208,6 +201,13 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
goto out;
}
}
if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
&& !(file->f_flags & O_RDONLY)) {
rc = -EPERM;
printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
"file must hence be opened RO\n", __func__);
goto out;
}
ecryptfs_set_file_lower(
file, ecryptfs_inode_to_private(inode)->lower_file);
if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
Expand Down Expand Up @@ -299,7 +299,6 @@ static int ecryptfs_ioctl(struct inode *inode, struct file *file,
const struct file_operations ecryptfs_dir_fops = {
.readdir = ecryptfs_readdir,
.ioctl = ecryptfs_ioctl,
.mmap = generic_file_mmap,
.open = ecryptfs_open,
.flush = ecryptfs_flush,
.release = ecryptfs_release,
Expand Down
134 changes: 97 additions & 37 deletions fs/ecryptfs/inode.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -282,7 +282,8 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
goto out;
}
rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
ecryptfs_dir_inode->i_sb, 1);
ecryptfs_dir_inode->i_sb,
ECRYPTFS_INTERPOSE_FLAG_D_ADD);
if (rc) {
printk(KERN_ERR "%s: Error interposing; rc = [%d]\n",
__func__, rc);
Expand Down Expand Up @@ -463,9 +464,6 @@ static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
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;
}

Expand Down Expand Up @@ -614,14 +612,25 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *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);
lock_rename(lower_old_dir_dentry, lower_new_dir_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)
Expand Down Expand Up @@ -772,18 +781,23 @@ upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
}

/**
* ecryptfs_truncate
* truncate_upper
* @dentry: The ecryptfs layer dentry
* @new_length: The length to expand the file to
* @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 need to modify the
* underlying file size according to the page index interpolations.
* 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
*/
int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
static int truncate_upper(struct dentry *dentry, struct iattr *ia,
struct iattr *lower_ia)
{
int rc = 0;
struct inode *inode = dentry->d_inode;
Expand All @@ -794,8 +808,10 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
loff_t lower_size_before_truncate;
loff_t lower_size_after_truncate;

if (unlikely((new_length == i_size)))
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;
/* Set up a fake ecryptfs file, this is used to interface with
* the file in the underlying filesystem so that the
Expand All @@ -815,28 +831,30 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
&fake_ecryptfs_file,
ecryptfs_inode_to_private(dentry->d_inode)->lower_file);
/* Switch on growing or shrinking file */
if (new_length > i_size) {
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(&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
(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
- (new_length & ~PAGE_CACHE_MASK));
- (ia->ia_size & ~PAGE_CACHE_MASK));

if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
rc = vmtruncate(inode, new_length);
rc = vmtruncate(inode, ia->ia_size);
if (rc)
goto out_free;
rc = vmtruncate(lower_dentry->d_inode, new_length);
lower_ia->ia_size = ia->ia_size;
lower_ia->ia_valid |= ATTR_SIZE;
goto out_free;
}
if (num_zeros) {
Expand All @@ -848,7 +866,7 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
goto out_free;
}
rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt,
new_length, num_zeros);
ia->ia_size, num_zeros);
kfree(zeros_virt);
if (rc) {
printk(KERN_ERR "Error attempting to zero out "
Expand All @@ -857,7 +875,7 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
goto out_free;
}
}
vmtruncate(inode, new_length);
vmtruncate(inode, ia->ia_size);
rc = ecryptfs_write_inode_size_to_metadata(inode);
if (rc) {
printk(KERN_ERR "Problem with "
Expand All @@ -870,10 +888,12 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
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);
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_free:
if (ecryptfs_file_to_private(&fake_ecryptfs_file))
Expand All @@ -883,6 +903,33 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
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)
{
Expand All @@ -905,6 +952,7 @@ 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;
Expand Down Expand Up @@ -943,15 +991,11 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
}
}
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) {
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);
rc = truncate_upper(dentry, ia, &lower_ia);
if (rc < 0)
goto out;
}
Expand All @@ -960,17 +1004,32 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
* 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;
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, ia);
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(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)
Expand Down Expand Up @@ -1100,6 +1159,7 @@ const struct inode_operations ecryptfs_dir_iops = {
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,
Expand Down
4 changes: 2 additions & 2 deletions fs/ecryptfs/main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -585,8 +585,8 @@ static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
* with as much information as it can before needing
* the lower filesystem.
* ecryptfs_read_super(): this accesses the lower filesystem and uses
* ecryptfs_interpolate to perform most of the linking
* ecryptfs_interpolate(): links the lower filesystem into ecryptfs
* ecryptfs_interpose to perform most of the linking
* ecryptfs_interpose(): links the lower filesystem into ecryptfs (inode.c)
*/
static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
Expand Down

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