Commit 6425e7b0 authored Nov 22, 2014 by Milan Broz Committed by Greg Kroah-Hartman Jan 08, 2015

dm crypt: use memzero_explicit for on-stack buffer



commit 1a71d6ffe18c0d0f03fc8531949cc8ed41d702ee upstream.

Use memzero_explicit to cleanup sensitive data allocated on stack
to prevent the compiler from optimizing and removing memset() calls.

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 3c737ac9

drivers/md/dm-crypt.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -705,7 +705,7 @@ static int crypt_iv_tcw_whitening(struct crypt_config *cc,
		for (i = 0; i < ((1 << SECTOR_SHIFT) / 8); i++)
		crypto_xor(data + i * 8, buf, 8);
		out:
		memset(buf, 0, sizeof(buf));
		memzero_explicit(buf, sizeof(buf));
		return r;
		}