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authorKeith Busch <keith.busch@intel.com>2018-11-07 07:37:45 -0700
committerJens Axboe <axboe@kernel.dk>2018-11-07 15:41:31 -0700
commitf3587d76da05f68098ddb1cb3c98cc6a9e8a402c (patch)
tree8b63b149df907b539e68069d20bcfcfd1480a06d
parente31d36b0a453d581fb077fce6883811c5e14874d (diff)
downloadlinux-f3587d76da05f68098ddb1cb3c98cc6a9e8a402c.tar.bz2
block: Clear kernel memory before copying to user
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>
-rw-r--r--block/bio.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c
index 4a5a036268fb..9a9c59067521 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1260,6 +1260,7 @@ 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);
}