This is a note to let you know that I've just added the patch titled
fscrypto: require write access to mount to set encryption policy
to the 4.4-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:
fscrypto-require-write-access-to-mount-to-set-encryption-policy.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ba63f23d69a3a10e7e527a02702023da68ef8a6d Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Thu, 8 Sep 2016 14:20:38 -0700
Subject: fscrypto: require write access to mount to set encryption policy
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit ba63f23d69a3a10e7e527a02702023da68ef8a6d upstream.
Since setting an encryption policy requires writing metadata to the
filesystem, it should be guarded by mnt_want_write/mnt_drop_write.
Otherwise, a user could cause a write to a frozen or readonly
filesystem. This was handled correctly by f2fs but not by ext4. Make
fscrypt_process_policy() handle it rather than relying on the filesystem
to get it right.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.1+; check fs/{ext4,f2fs}
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Acked-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/ioctl.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -629,7 +629,13 @@ resizefs_out:
goto encryption_policy_out;
}
+ err = mnt_want_write_file(filp);
+ if (err)
+ goto encryption_policy_out;
+
err = ext4_process_policy(&policy, inode);
+
+ mnt_drop_write_file(filp);
encryption_policy_out:
return err;
#else
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-4.4/fscrypto-require-write-access-to-mount-to-set-encryption-policy.patch
queue-4.4/fscrypto-add-authorization-check-for-setting-encryption-policy.patch
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