Commit a4da95ea authored Nov 07, 2018 by Keith Busch Committed by Greg Kroah-Hartman Nov 27, 2018

block: Clear kernel memory before copying to user



[ Upstream commit f3587d76da05f68098ddb1cb3c98cc6a9e8a402c ]

If the kernel allocates a bounce buffer for user read data, this memory
needs to be cleared before copying it to the user, otherwise it may leak
kernel memory to user space.

Laurence Oberman <loberman@redhat.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent b352afaa

block/bio.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1261,6 +1261,7 @@ struct bio bio_copy_user_iov(struct request_queue q,
		if (ret)
		goto cleanup;
		} else {
		zero_fill_bio(bio);
		iov_iter_advance(iter, bio->bi_iter.bi_size);
		}