Message ID | 20210705100006.90-1-xieyongji@bytedance.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | [v4] virtio-blk: Add validation for block size in config space | expand |
On Mon, Jul 05, 2021 at 06:00:06PM +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 <xieyongji@bytedance.com> I replied on v3. Silently ignoring what hypervisor said is not a good idea. > --- > 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 e4bd3b1fc3c2..e9d7747c3cc0 100644 > --- a/drivers/block/virtio_blk.c > +++ b/drivers/block/virtio_blk.c > @@ -819,7 +819,7 @@ 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
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index e4bd3b1fc3c2..e9d7747c3cc0 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -819,7 +819,7 @@ 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);
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(-)