linux-kernel - Re: [PATCH v8 3/3] hv_netvsc: Use vmbus_requestor to generate transaction IDs for VMBus hardening

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Date:   Thu, 5 Nov 2020 04:32:58 +0100
From:   Andrea Parri <parri.andrea@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, linux-hyperv@...r.kernel.org,
        Andres Beltran <lkmlabelt@...il.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Saruhan Karademir <skarade@...rosoft.com>,
        Juan Vazquez <juvazq@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v8 3/3] hv_netvsc: Use vmbus_requestor to generate
 transaction IDs for VMBus hardening

On Wed, Nov 04, 2020 at 01:45:05PM -0800, Jakub Kicinski wrote:
> On Wed, 4 Nov 2020 13:43:48 -0800 Jakub Kicinski wrote:
> > On Wed,  4 Nov 2020 16:40:27 +0100 Andrea Parri (Microsoft) wrote:
> > > From: Andres Beltran <lkmlabelt@...il.com>
> > > 
> > > Currently, pointers to guest memory are passed to Hyper-V as
> > > transaction IDs in netvsc. In the face of errors or malicious
> > > behavior in Hyper-V, netvsc should not expose or trust the transaction
> > > IDs returned by Hyper-V to be valid guest memory addresses. Instead,
> > > use small integers generated by vmbus_requestor as requests
> > > (transaction) IDs.
> > > 
> > > Signed-off-by: Andres Beltran <lkmlabelt@...il.com>
> > > Co-developed-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> > > Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> > > Reviewed-by: Michael Kelley <mikelley@...rosoft.com>  
> > 
> > I'm assuming this is targeting net-next? If so could you please tag it
> > as [PATCH net-next vN]?
> 
> Ah, you don't 'cause you only sent us the third patch. In that case with
> the nit below addressed:
> 
> Acked-by: Jakub Kicinski <kuba@...nel.org>

I fixed the declarations locally.  Thank you for the review, Jakub.

(Yes, FWIW, I was imaging the series to go via hyperv-next...)

Thanks,
  Andrea


> 
> > > @@ -695,10 +695,19 @@ static void netvsc_send_tx_complete(struct net_device *ndev,
> > >  				    const struct vmpacket_descriptor *desc,
> > >  				    int budget)
> > >  {
> > > -	struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
> > > +	struct sk_buff *skb;
> > >  	struct net_device_context *ndev_ctx = netdev_priv(ndev);  
> > 
> > Swap these two lines please to keep the variables declaration lines
> > longest to shortest.
>