linux-kernel - Re: For review: seccomp_user

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Date:   Wed, 30 Sep 2020 09:11:28 -0600
From:   Tycho Andersen <tycho@...ho.pizza>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     Sargun Dhillon <sargun@...gun.me>,
        Kees Cook <keescook@...omium.org>,
        Christian Brauner <christian@...uner.io>,
        linux-man <linux-man@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Aleksa Sarai <cyphar@...har.com>, Jann Horn <jannh@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>, wad@...omium.org,
        bpf@...r.kernel.org, Song Liu <songliubraving@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andy Lutomirski <luto@...capital.net>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Robert Sesek <rsesek@...gle.com>
Subject: Re: For review: seccomp_user_notif(2) manual page

On Wed, Sep 30, 2020 at 09:03:36AM -0600, Tycho Andersen wrote:
> On Wed, Sep 30, 2020 at 01:07:38PM +0200, Michael Kerrisk (man-pages) wrote:
> >        ┌─────────────────────────────────────────────────────┐
> >        │FIXME                                                │
> >        ├─────────────────────────────────────────────────────┤
> >        │Interestingly, after the event  had  been  received, │
> >        │the  file descriptor indicates as writable (verified │
> >        │from the source code and by experiment). How is this │
> >        │useful?                                              │
> 
> You're saying it should just do EPOLLOUT and not EPOLLWRNORM? Seems
> reasonable.

If we make this change, I suppose we should also drop EPOLLRDNORM from
things which have not been received yet, since they're not really
readable.

Tycho