| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.18 32/59] block: Clear kernel memory before copying to user | Date | Wed, 14 Nov 2018 17:23:04 -0500 |
| |
From: Keith Busch <keith.busch@intel.com>
[ 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> --- block/bio.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/block/bio.c b/block/bio.c index ff94640bc734..5ad106e765fc 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1336,6 +1336,7 @@ 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); } -- 2.17.1
|