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Subject[PATCH AUTOSEL 4.18 32/59] block: Clear kernel memory before copying to user
Date
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
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