This is a note to let you know that I've just added the patch titled
ext4: don't allow encrypted operations without keys
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-don-t-allow-encrypted-operations-without-keys.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 173b8439e1ba362007315868928bf9d26e5cc5a6 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Wed, 28 Dec 2016 00:22:52 -0500
Subject: ext4: don't allow encrypted operations without keys
From: Theodore Ts'o <tytso@xxxxxxx>
commit 173b8439e1ba362007315868928bf9d26e5cc5a6 upstream.
While we allow deletes without the key, the following should not be
permitted:
# cd /vdc/encrypted-dir-without-key
# ls -l
total 4
-rw-r--r-- 1 root root 0 Dec 27 22:35 6,LKNRJsp209FbXoSvJWzB
-rw-r--r-- 1 root root 286 Dec 27 22:35 uRJ5vJh9gE7vcomYMqTAyD
# mv uRJ5vJh9gE7vcomYMqTAyD 6,LKNRJsp209FbXoSvJWzB
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/namei.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3527,6 +3527,12 @@ static int ext4_rename(struct inode *old
EXT4_I(old_dentry->d_inode)->i_projid)))
return -EXDEV;
+ if ((ext4_encrypted_inode(old_dir) &&
+ !fscrypt_has_encryption_key(old_dir)) ||
+ (ext4_encrypted_inode(new_dir) &&
+ !fscrypt_has_encryption_key(new_dir)))
+ return -ENOKEY;
+
retval = dquot_initialize(old.dir);
if (retval)
return retval;
@@ -3726,6 +3732,12 @@ static int ext4_cross_rename(struct inod
u8 new_file_type;
int retval;
+ if ((ext4_encrypted_inode(old_dir) &&
+ !fscrypt_has_encryption_key(old_dir)) ||
+ (ext4_encrypted_inode(new_dir) &&
+ !fscrypt_has_encryption_key(new_dir)))
+ return -ENOKEY;
+
if ((ext4_encrypted_inode(old_dir) ||
ext4_encrypted_inode(new_dir)) &&
(old_dir != new_dir) &&
Patches currently in stable-queue which might be from tytso@xxxxxxx are
queue-4.9/vfs-deny-copy_file_range-for-non-regular-files.patch
queue-4.9/ext4-don-t-allow-encrypted-operations-without-keys.patch
queue-4.9/ext4-fix-data-corruption-for-mmap-writes.patch
queue-4.9/ext4-don-t-clear-sgid-when-inheriting-acls.patch
queue-4.9/f2fs-don-t-allow-encrypted-operations-without-keys.patch