linux-kernel - Re: [PATCH net-next] virtio-net: don't do header check for dodgy gso packets

Open Source and information security mailing list archives

Date:	Wed, 3 Dec 2014 11:31:49 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] virtio-net: don't do header check for dodgy gso
 packets

On Wed, Dec 03, 2014 at 02:40:44PM +0800, Jason Wang wrote:
> There's no need to do header check for virito-net since:

s/virito/virtio/

> 
> - Host set dodgy for all gso packets from guest and check the header.

s/set/sets/

> - Host should prepare for all kinds of evil packets from guest, since

s/prepare/be prepared/

>   malicious guest can send any kinds of packet.
> 
> So this patch sets NETIF_F_GSO_ROBUST for virtio-net to skip the check.
> 
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

with the comment fixes:

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
>  drivers/net/virtio_net.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index b0bc8ea..4cd242b 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1760,6 +1760,8 @@ static int virtnet_probe(struct virtio_device *vdev)
>  		if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
>  			dev->hw_features |= NETIF_F_TSO_ECN;
>  
> +		dev->features |= NETIF_F_GSO_ROBUST;
> +
>  		if (gso)
>  			dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
>  		/* (!csum && gso) case will be fixed by register_netdev() */
> -- 
> 1.9.1
> 
> _______________________________________________
> Virtualization mailing list
> Virtualization@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/virtualization
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