Re: [PATCH v2] virtio-blk: Add validation for block size in config space
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2021-06-15 15:27:35
Also in:
linux-block, lkml
On Tue, Jun 15, 2021 at 06:48:10PM +0800, Xie Yongji wrote:
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 <redacted>
I'd say if device presents an unreasonable value, and we want to ignore that, then we should not negotiate VIRTIO_BLK_F_BLK_SIZE so that host knows. So maybe move the logic to validate_features.
quoted hunk
--- 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
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