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

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Message-ID: <20210126143405.GA1364@anparri>
Date:   Tue, 26 Jan 2021 15:34:05 +0100
From:   Andrea Parri <parri.andrea@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        linux-hyperv@...r.kernel.org,
        Saruhan Karademir <skarade@...rosoft.com>,
        Juan Vazquez <juvazq@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] hv_netvsc: Copy packets sent by Hyper-V out of
 the receive buffer

On Tue, Jan 26, 2021 at 12:38:47PM +0100, Andrea Parri (Microsoft) 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.
> 
> Reported-by: Juan Vazquez <juvazq@...rosoft.com>
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: netdev@...r.kernel.org

Please ignore this submission, I'm sending a new version shortly...  Sorry for
the hassle.

  Andrea