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Date:   Sun, 17 Jan 2021 18:41:39 +0100
From:   Andrea Parri <parri.andrea@gmail.com>
To:     Wei Liu <wei.liu@kernel.org>
Cc:     Jakub Kicinski <kuba@kernel.org>, linux-kernel@vger.kernel.org,
        "K . Y . Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Saruhan Karademir <skarade@microsoft.com>,
        Juan Vazquez <juvazq@microsoft.com>,
        linux-hyperv@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>, netdev@vger.kernel.org,
        bpf@vger.kernel.org
Subject: Re: [PATCH v2] hv_netvsc: Add (more) validation for untrusted
 Hyper-V values
Message-ID: <20210117174139.GA1703@anparri>
References: <20210114202628.119541-1-parri.andrea@gmail.com>
 <20210115203022.7005e66a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
 <20210116130201.GA1579@anparri>
 <20210117151032.sbhjryq2hs3ctnlx@liuwe-devbox-debian-v2>
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On Sun, Jan 17, 2021 at 03:10:32PM +0000, Wei Liu wrote:
> On Sat, Jan 16, 2021 at 02:02:01PM +0100, Andrea Parri wrote:
> > On Fri, Jan 15, 2021 at 08:30:22PM -0800, Jakub Kicinski wrote:
> > > On Thu, 14 Jan 2021 21:26:28 +0100 Andrea Parri (Microsoft) wrote:
> > > > For additional robustness in the face of Hyper-V errors or malicious
> > > > behavior, validate all values that originate from packets that Hyper-V
> > > > has sent to the guest.  Ensure that invalid values cannot cause indexing
> > > > off the end of an array, or subvert an existing validation via integer
> > > > overflow.  Ensure that outgoing packets do not have any leftover guest
> > > > memory that has not been zeroed out.
> > > > 
> > > > Reported-by: Juan Vazquez <juvazq@microsoft.com>
> > > > Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> > > > Cc: "David S. Miller" <davem@davemloft.net>
> > > > Cc: Jakub Kicinski <kuba@kernel.org>
> > > > Cc: Alexei Starovoitov <ast@kernel.org>
> > > > Cc: Daniel Borkmann <daniel@iogearbox.net>
> > > > Cc: Andrii Nakryiko <andrii@kernel.org>
> > > > Cc: Martin KaFai Lau <kafai@fb.com>
> > > > Cc: Song Liu <songliubraving@fb.com>
> > > > Cc: Yonghong Song <yhs@fb.com>
> > > > Cc: John Fastabend <john.fastabend@gmail.com>
> > > > Cc: KP Singh <kpsingh@kernel.org>
> > > > Cc: netdev@vger.kernel.org
> > > > Cc: bpf@vger.kernel.org
> > > > ---
> > > > Applies to 5.11-rc3 (and hyperv-next).
> > > 
> > > So this is for hyperv-next or should we take it via netdev trees?
> > 
> > No preference, either way is good for me.
> 
> To be clear: There is no dependency on any patch in hyperv-next, right?
> 
> That's my understanding, but I would like to confirm it.

Well, I wrote that this *applies* to hyperv-next... but that's indeed
the only 'dependency' I can think of.

Hope this helps.

Thanks,
  Andrea