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List: linux-kernel
Subject: [Patch 2.6] dm-crypt: zero key before freeing it
From: Stefan Rompf <stefan () loplof ! de>
Date: 2006-01-04 20:08:04
Message-ID: 200601042108.04544.stefan () loplof ! de
[Download RAW message or body]
Hi Andrew,
dm-crypt does not clear struct crypt_config before freeing it. Thus,
information on the key could leak f.e. to a swsusp image even after the
encrypted device has been removed. The attached patch against 2.6.14 / 2.6.15
fixes it.
Signed-off-by: Stefan Rompf <stefan@loplof.de>
Acked-by: Clemens Fruhwirth <clemens@endorphin.org>
--- linux-2.6.14.4/drivers/md/dm-crypt.c.old 2005-12-16 18:27:05.000000000 +0100
+++ linux-2.6.14.4/drivers/md/dm-crypt.c 2005-12-28 12:49:13.000000000 +0100
@@ -694,6 +694,7 @@ bad3:
bad2:
crypto_free_tfm(tfm);
bad1:
+ memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
kfree(cc);
return -EINVAL;
}
@@ -710,6 +711,7 @@ static void crypt_dtr(struct dm_target *
cc->iv_gen_ops->dtr(cc);
crypto_free_tfm(cc->tfm);
dm_put_device(ti, cc->dev);
+ memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
kfree(cc);
}
-
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