linux-kernel - Re: [PATCH 2/2] procfs/tasks: add a simple per-task procfs hidepid= field

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Date:   Thu, 3 Nov 2016 18:55:58 +0100
From:   Jann Horn <jann@...jh.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     Lafcadio Wluiki <wluikil@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 2/2] procfs/tasks: add a simple per-task procfs hidepid=
 field

On Thu, Nov 03, 2016 at 10:12:55AM -0600, Kees Cook wrote:
> On Thu, Nov 3, 2016 at 9:30 AM, Lafcadio Wluiki <wluikil@...il.com> wrote:
> > (Third, rebased submission, since first two submissions yielded no replies.)
> >
> > This adds a new per-task hidepid= flag that is honored by procfs when
> > presenting /proc to the user, in addition to the existing hidepid= mount
> > option. So far, hidepid= was exclusively a per-pidns setting. Locking
> > down a set of processes so that they cannot see other user's processes
> > without affecting the rest of the system thus currently requires
> > creation of a private PID namespace, with all the complexity it brings,
> > including maintaining a stub init process as PID 1 and losing the
> > ability to see processes of the same user on the rest of the system.
[...]
> Since this adds a new prctl interface, it's best to Cc linux-arch
> (which I added now).

Please also CC linux-api for the next iteration, since this is a new
userspace-facing API.