eCryptfs: Filename encryption only supports password auth tokens
Returns -ENOTSUPP when attempting to use filename encryption with
something other than a password authentication token, such as a private
token from openssl. Using filename encryption with a userspace eCryptfs
key module is a future goal. Until then, this patch handles the
situation a little better than simply using a BUG_ON().
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: ecryptfs-devel@lists.launchpad.net
Cc: stable <stable@kernel.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 3a61f05..17164e4 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -612,7 +612,12 @@
}
/* TODO: Support other key modules than passphrase for
* filename encryption */
- BUG_ON(s->auth_tok->token_type != ECRYPTFS_PASSWORD);
+ if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
+ rc = -EOPNOTSUPP;
+ printk(KERN_INFO "%s: Filename encryption only supports "
+ "password tokens\n", __func__);
+ goto out_free_unlock;
+ }
sg_init_one(
&s->hash_sg,
(u8 *)s->auth_tok->token.password.session_key_encryption_key,
@@ -910,7 +915,12 @@
}
/* TODO: Support other key modules than passphrase for
* filename encryption */
- BUG_ON(s->auth_tok->token_type != ECRYPTFS_PASSWORD);
+ if (s->auth_tok->token_type != ECRYPTFS_PASSWORD) {
+ rc = -EOPNOTSUPP;
+ printk(KERN_INFO "%s: Filename encryption only supports "
+ "password tokens\n", __func__);
+ goto out_free_unlock;
+ }
rc = crypto_blkcipher_setkey(
s->desc.tfm,
s->auth_tok->token.password.session_key_encryption_key,