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block: Clear kernel memory before copying to user

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[ Upstream commit f3587d76da ]

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>
This commit is contained in:
Keith Busch 2018-11-07 07:37:45 -07:00 committed by Greg Kroah-Hartman
parent b352afaac1
commit a4da95ea10
1 changed files with 1 additions and 0 deletions
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block/bio.c
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@ -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);
}