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eCryptfs: Fix encrypted file name lookup regression

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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>
This commit is contained in:
Tyler Hicks 2010-08-25 10:26:37 -05:00
parent 7371a38201
commit 93c3fe40c2
2 changed files with 24 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
fs/ecryptfs/crypto.c
View file

@ -2169,7 +2169,6 @@ int ecryptfs_encrypt_and_encode_filename(
(ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE
+ encoded_name_no_prefix_size);
(*encoded_name)[(*encoded_name_size)] = '\0';
(*encoded_name_size)++;
} else {
rc = -EOPNOTSUPP;
}

31
fs/ecryptfs/inode.c
View file

@ -349,7 +349,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
/**
* ecryptfs_new_lower_dentry
* @ename: The name of the new dentry.
* @name: The name of the new dentry.
* @lower_dir_dentry: Parent directory of the new dentry.
* @nd: nameidata from last lookup.
*
@ -386,20 +386,19 @@ ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_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 dentry *lower_dir_dentry, struct qstr *name)
{
struct nameidata nd;
struct vfsmount *lower_mnt;
struct qstr *name;
int err;
name = &ecryptfs_dentry->d_name;
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);
@ -434,6 +433,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
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;
@ -444,9 +444,17 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
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_dir_dentry, &lower_name);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "
@ -471,8 +479,17 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
"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_dir_dentry, &lower_name);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned "