linux-kernel - Re: [PATCH] Add pidfs filesystem

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Message-ID: <CAFLxGvw2-k1zKkD+cy-ZdfdXv05PLBib-VqnHRkWGNxfCSF-iA@mail.gmail.com>
Date:   Wed, 22 Feb 2017 21:11:22 +0100
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Alexey Gladkov <gladkov.alexey@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Vasiliy Kulikov <segoon@...nwall.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Emelyanov <xemul@...allels.com>,
        Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH] Add pidfs filesystem

On Mon, Feb 20, 2017 at 5:05 AM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Alexey Gladkov <gladkov.alexey@...il.com> writes:
>
>> The pidfs filesystem contains a subset of the /proc file system which
>> contains only information about the processes.
>
> My summary of your motivation.
>
> It hurts when I create a container with a processes with uid 0 inside of
> it.  This generates lots of hacks to attempt to limit uid 0.
>
>   My answer:  Don't run a container with a real uid 0 inside of it.

I agree. Unless I miss something I'd say use a user namespace
to get decent permission checks in /proc (and /sys).

-- 
Thanks,
//richard