dm crypt: wipe kernel key copy after IV initialization

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commit dc94902bde upstream.

Loading key via kernel keyring service erases the internal
key copy immediately after we pass it in crypto layer. This is
wrong because IV is initialized later and we use wrong key
for the initialization (instead of real key there's just zeroed
block).

The bug may cause data corruption if key is loaded via kernel keyring
service first and later same crypt device is reactivated using exactly
same key in hexbyte representation, or vice versa. The bug (and fix)
affects only ciphers using following IVs: essiv, lmk and tcw.

Fixes: c538f6ec9f ("dm crypt: add ability to use keys from the kernel key retention service")
Signed-off-by: Ondrej Kozina <okozina@redhat.com>
Reviewed-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ondrej Kozina 2018-01-12 16:30:32 +01:00 • committed by Greg Kroah-Hartman

parent 6b8fdeadeb

commit 82e12f1b26

1 changed files with 8 additions and 4 deletions

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drivers/md/dm-crypt.c

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