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From: Xie Yongji <xieyongji@bytedance.com>
To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com,
	axboe@kernel.dk
Cc: virtualization@lists.linux-foundation.org,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] virtio-blk: Add validation for block size in config space
Date: Tue, 15 Jun 2021 18:48:10 +0800	[thread overview]
Message-ID: <20210615104810.151-1-xieyongji@bytedance.com> (raw)

This ensures that we will not use an invalid block size
in config space (might come from an untrusted device).

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
 drivers/block/virtio_blk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b9fa3ef5b57c..85ae3b27ea4b 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -827,7 +827,7 @@ static int virtblk_probe(struct virtio_device *vdev)
 	err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
 				   struct virtio_blk_config, blk_size,
 				   &blk_size);
-	if (!err)
+	if (!err && blk_size >= SECTOR_SIZE && blk_size <= PAGE_SIZE)
 		blk_queue_logical_block_size(q, blk_size);
 	else
 		blk_size = queue_logical_block_size(q);
-- 
2.11.0


             reply	other threads:[~2021-06-15 10:48 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15 10:48 Xie Yongji [this message]
2021-06-15 15:27 ` [PATCH v2] virtio-blk: Add validation for block size in config space Michael S. Tsirkin
2021-06-15 15:27   ` Michael S. Tsirkin
2021-06-16  8:35   ` Yongji Xie

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