linux-kernel - Re: [PATCH v2 net-next] hv_netvsc: Copy packets sent by Hyper-V out of the receive buffer

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Date:   Wed, 3 Feb 2021 12:17:48 +0100
From:   Andrea Parri <parri.andrea@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, mikelley@...rosoft.com,
        linux-hyperv@...r.kernel.org, skarade@...rosoft.com,
        juvazq@...rosoft.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] hv_netvsc: Copy packets sent by Hyper-V out
 of the receive buffer

On Tue, Feb 02, 2021 at 11:45:49AM -0800, Jakub Kicinski wrote:
> On Tue, 2 Feb 2021 09:18:43 +0100 Andrea Parri wrote:
> > Hi net maintainers,
> > 
> > 
> > On Sat, Jan 30, 2021 at 12:50:06AM +0000, patchwork-bot+netdevbpf@...nel.org wrote:
> > > Hello:
> > > 
> > > This patch was applied to netdev/net-next.git (refs/heads/master):
> > > 
> > > On Tue, 26 Jan 2021 17:29:07 +0100 you wrote:  
> > > > Pointers to receive-buffer packets sent by Hyper-V are used within the
> > > > guest VM.  Hyper-V can send packets with erroneous values or modify
> > > > packet fields after they are processed by the guest.  To defend against
> > > > these scenarios, copy (sections of) the incoming packet after validating
> > > > their length and offset fields in netvsc_filter_receive().  In this way,
> > > > the packet can no longer be modified by the host.
> > > > 
> > > > [...]  
> > > 
> > > Here is the summary with links:
> > >   - [v2,net-next] hv_netvsc: Copy packets sent by Hyper-V out of the receive buffer
> > >     https://git.kernel.org/netdev/net-next/c/0ba35fe91ce3  
> > 
> > I'd have some fixes on top of this and I'm wondering about the process: would
> > you consider fixes/patches on top of this commit now? 
> 
> Fixes for bugs present in Linus's tree?
> 
> You need to target the net tree, and give us instructions on how to
> resolve the conflict which will arise from merging net into net-next.
> 
> > would you rather prefer me to squash these fixes into a v3? other?
> 
> Networking trees are immutable, and v2 was already applied. We could
> do a revert, apply fix, apply v3, but we prefer to just handle the 
> merge conflict.

Thanks for the clarification, Jakub.

And sorry for the confusion; let me just send out the 'fixes'/patches (I
have one targeting the net tree and two targeting the net-next tree, with
no conflict between them), so that they can be reviewed and we can agree
/discuss any further steps.

Thanks,
  Andrea