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.
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