linux-kernel - Re: [Ksummit-discuss] security-related TODO items?

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Message-ID: <CACVxJT8jQFr9w+s6DS2LA0_ia6qg7UyHyb8vK0BsYLKhVwzbzA@mail.gmail.com>
Date:   Tue, 24 Jan 2017 13:38:28 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Kees Cook <keescook@...omium.org>,
        Djalal Harouni <tixxdz@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Josh Armour <jarmour@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "ksummit-discuss@...ts.linuxfoundation.org" 
        <ksummit-discuss@...ts.linuxfoundation.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Ksummit-discuss] security-related TODO items?

        [add linux-kernel]

On Tue, Jan 24, 2017 at 5:38 AM, Andy Lutomirski <luto@...capital.net> wrote:
> Here's another one: split up and modernize /proc.
>
> I'm imagining a whole series of changes:
>
>  - Make a sysctlfs.  You could mount it and get all the sysctls if you
> have global privilege.  If you only have privilege relative to some
> namespace, you could pass a mount option like -o scope=net to get just
> sysctls that belong to the mounting process' netns.  If done
> carefully, this should be safe for unprivileged mounting without the
> fs_fully_visible() checks.
>
>  - Teach procfs to understand mount options for real (per-superblock).
> Shouldn't be that hard.
>
>  - Make it possible to control hidepid per mount.  systemd and such
> could use this to tighten up daemons.
>
>  - Make it possible to make /proc/PID/cmdline only show argv[0] via
> per-mount option or perhaps sysctl.
>
>  - Make it possible to mount a mini-proc that doesn't have all the
> non-PID stuff.  Presumably it would still have an empty directory
> called sys and maybe some other minimal contents for compatibility

Yes, please!

mount -t sysctl ...
mount -t proc-pid ...
mount -t proc-kitchen-sink ...