linux-kernel - Re: [PATCH v7 0/6] seccomp trap to userspace

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Date:   Fri, 28 Sep 2018 15:34:31 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Michael Kerrisk <mtk.manpages@...il.com>
Cc:     Tycho Andersen <tycho@...ho.ws>,
        lkml <linux-kernel@...r.kernel.org>,
        Containers <containers@...ts.linux-foundation.org>,
        Linux API <linux-api@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Oleg Nesterov <oleg@...hat.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Tyler Hicks <tyhicks@...onical.com>,
        Akihiro Suda <suda.akihiro@....ntt.co.jp>,
        Jann Horn <jannh@...gle.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v7 0/6] seccomp trap to userspace

On Fri, Sep 28, 2018 at 3:16 PM, Michael Kerrisk (man-pages)
<mtk.manpages@...il.com> wrote:
> Hi Tycho,
>
> On Sat, 29 Sep 2018 at 00:04, Tycho Andersen <tycho@...ho.ws> wrote:
>>
>> On Fri, Sep 28, 2018 at 11:57:40PM +0200, Michael Kerrisk (man-opages) wrote:
>> > Hi Tycho,
>> >
>> > On 09/27/2018 05:11 PM, Tycho Andersen wrote:
>> > > Hi all,
>> > >
>> > > Here's v7 of the seccomp trap to userspace set. There are various minor
>> > > changes and bug fixes, but two major changes:
>> > >
>> > > * We now pass fds to the tracee via an ioctl, and do it immediately when
>> > >    the ioctl is called. For this we needed some help from the vfs, so
>> > >    I've put the one patch in this series and cc'd fsdevel. This does have
>> > >    the advantage that the feature is now totally decoupled from the rest
>> > >    of the set, which is itself useful (thanks Andy!)
>> > >
>> > > * Instead of putting all of the notification related stuff into the
>> > >    struct seccomp_filter, it now lives in its own struct notification,
>> > >    which is pointed to by struct seccomp_filter. This will save a lot of
>> > >    memory (thanks Tyler!)
>> >
>> > Is there a documentation (man page) patch for this API change?
>>
>> Not yet, but once we decide on a final API I'll prepare one.
>
> Honestly, the production of such documentation should be part of the
> evolution towards the final API...
>
> Documentation is not an afterthought. It's a tool for pushing you, the
> developer (and others, your reviewers) to more deeply consider your
> design.

In Tycho's defense, he did write up documentation in Documentation/
for the feature, so it won't be an afterthought. :) But yes, there's
no manpage delta yet.

-Kees

-- 
Kees Cook
Pixel Security