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| author | Keith Busch <keith.busch@intel.com> | 2018-11-07 07:37:45 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-27 16:13:05 +0100 |
| commit | a4da95ea101b2741488c6d84d3ce6e3d0cdffd62 (patch) | |
| tree | 6407fe53c36a96abd58e52bce90038204c32139a /block | |
| parent | b352afaac108d9d6c10cd1d9cd6155b83b779b65 (diff) | |
| download | linux-stable-a4da95ea101b2741488c6d84d3ce6e3d0cdffd62.tar.gz linux-stable-a4da95ea101b2741488c6d84d3ce6e3d0cdffd62.tar.bz2 linux-stable-a4da95ea101b2741488c6d84d3ce6e3d0cdffd62.zip | |
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index 0093bed81c0e..41173710430c 100644 --- a/block/bio.c +++ b/block/bio.c @@ -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); } |