linux-kernel - Re: [PATCH 2/4] pid: add pidfd

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Message-ID: <20190328170700.hx5ywsij77wawmon@brauner.io>
Date:   Thu, 28 Mar 2019 18:07:01 +0100
From:   Christian Brauner <christian@...uner.io>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Jonathan Kowalski <bl0pbl33p@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Andy Lutomirski <luto@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Kerrisk-manpages <mtk.manpages@...il.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Daniel Colascione <dancol@...gle.com>
Subject: Re: [PATCH 2/4] pid: add pidfd_open()

On Thu, Mar 28, 2019 at 12:59:46PM -0400, Joel Fernandes wrote:
> 
> 
> On March 28, 2019 6:38:15 AM EDT, Christian Brauner <christian@...uner.io> wrote:
> >> All that said, thanks for the work on this once again. My intention
> >is
> >> just that we don't end up with an API that could have been done
> >better
> >> and be cleaner to use for potential users in the coming years.
> >
> >Thanks for your input on all of this. I still don't find multiplexers
> >in
> >the style of seccomp()/fsconfig()/keyctl() to be a problem since they
> >deal with a specific task. They are very much different from ioctl()s
> >in
> >that regard. But since Joel, you, and Daniel found the pidctl()
> >approach
> >not very nice I dropped it. The interface needs to be satisfactory for
> >all of us especially since Android and other system managers will be
> >the
> >main consumers.
> >So let's split this into pidfd_open(pid_t pid, unsigned int flags)
> >which
> >allows to cleanly get pidfds independent procfs and do the translation
> >to procpidfds in an ioctl() as we've discussed in prior threads. This
> >should also accommodate comments and ideas from Andy and Jann.
> >I'm coding this up now.
> 
> This sounds quite sensible to me. Thanks!

Thanks! I have it ready and hope to send it out later today.

Christian