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

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Message-ID: <533075A9-A6CF-4549-AFC8-B90505B198FD@joelfernandes.org>
Date:   Thu, 28 Mar 2019 12:59:46 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Christian Brauner <christian@...uner.io>,
        Jonathan Kowalski <bl0pbl33p@...il.com>
CC:     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 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!


Joel Fernandes, Android kernel team
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