[PATCH v2 3/5] fs, fscrypt: clear DCACHE_ENCRYPTED_NAME when unaliasing directory

Theodore Ts'o tytso at mit.edu
Wed Apr 17 07:06:10 PDT 2019

On Wed, Mar 20, 2019 at 11:39:11AM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers at google.com>
> Make __d_move() clear DCACHE_ENCRYPTED_NAME on the source dentry.  This
> is needed for when d_splice_alias() moves a directory's encrypted alias
> to its decrypted alias as a result of the encryption key being added.
> Otherwise, the decrypted alias will incorrectly be invalidated on the
> next lookup, causing problems such as unmounting a mount the user just
> mount()ed there.
> Note that we don't have to support arbitrary moves of this flag because
> fscrypt doesn't allow dentries with DCACHE_ENCRYPTED_NAME to be the
> source or target of a rename().
> Fixes: 28b4c263961c ("ext4 crypto: revalidate dentry after adding or removing the key")
> Reported-by: Sarthak Kukreti <sarthakkukreti at chromium.org>
> Signed-off-by: Eric Biggers <ebiggers at google.com>

Looks good, applied.

					- Ted

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