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Date:   Fri, 10 Aug 2018 20:32:32 -0600
From:   Tycho Andersen <tycho@tycho.ws>
To:     Dinesh Subhraveti <subhraveti@apporbit.com>
Cc:     Kees Cook <keescook@chromium.org>, Tobin Harding <me@tobin.cc>,
        linux-api@vger.kernel.org, containers@lists.linux-foundation.org,
        Akihiro Suda <suda.akihiro@lab.ntt.co.jp>,
        Oleg Nesterov <oleg@redhat.com>, linux-kernel@vger.kernel.org,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Andy Lutomirski <luto@amacapital.net>
Subject: Re: [PATCH v4 0/4] seccomp trap to userspace
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 <20180807024442.GA12274@cisco.lan>
 <CAP4sa4+rODVahad2hW-L3h7k6fkfGBsoCfDfBVuMwp3Aaie2KA@mail.gmail.com>
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On Tue, Aug 07, 2018 at 09:11:50PM -0700, Dinesh Subhraveti wrote:
> On Mon, Aug 6, 2018 at 7:44 PM, Tycho Andersen <tycho@tycho.ws> wrote:
> > Hi all,
> >
> > Dinesh Subhraveti has claimed that some part of this series might be
> > patented. While he has not furnished me with anything to confirm this
> > claim, I'll put this series on hold.
> 
> For the sake of everyone's clarity, there is no patent or intellectual
> property issue here and we'd like to see this feature in the kernel.  I did
> indicate that there is a patent related to the mechanism underlying this
> patch set but that is completely incidental to the issue here.  We have
> filed that patent only for the purpose of defense and have no interest or
> resources to go after infringements.  As such, I spoke about the approach,
> it's value for networking and a few possible ways of implementing it in the
> kernel at Linux Plumbers Conference 2017.
> 
> As a contractor and a member of our team at AppSwitch (FKA Fermat), Tycho
> Andersen helped implement a fully user space version of system call trap
> mechanism based on seccomp / fd-passing and participated in our team
> discussions about upstreaming a kernel version of the feature.  Given that
> context, we were taken aback that he posted the v1 patch set without
> letting us know and without any mention of AppSwitch in the post even
> though he was still under contract at that time.

It seems we disagree on the series of events, but agree that this
patchset should move forward. I'll work on preparing a v5.

Thanks!

Tycho