fs, fscrypt: clear DCACHE_ENCRYPTED_NAME when unaliasing directory

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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: 28b4c26396 ("ext4 crypto: revalidate dentry after adding or removing the key")
Reported-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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Eric Biggers 2019-03-20 11:39:11 -07:00 • committed by Theodore Ts'o

parent 968dd6d0c6

commit 0bf3d5c160

2 changed files with 18 additions and 0 deletions

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2

fs/dcache.c

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16

include/linux/fscrypt.h

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