linux-kernel - Re: [kernel-hardening] Re: [PATCH 1/2] security, perf: allow further restriction of perf_event

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Message-ID: <20160803214437.GI6879@twins.programming.kicks-ass.net>
Date:	Wed, 3 Aug 2016 23:44:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeff Vander Stoep <jeffv@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [kernel-hardening] Re: [PATCH 1/2] security, perf: allow further
 restriction of perf_event_open

On Wed, Aug 03, 2016 at 11:53:41AM -0700, Kees Cook wrote:
> > Kees Cook <keescook@...omium.org> writes:
> >
> >> On Tue, Aug 2, 2016 at 1:30 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> >> Let me take this another way instead. What would be a better way to
> >> provide a mechanism for system owners to disable perf without an LSM?
> >> (Since far fewer folks run with an enforcing "big" LSM: I'm seeking as
> >> wide a coverage as possible.)
> >
> > I vote for sandboxes.  Perhaps seccomp.  Perhaps a per userns sysctl.
> > Perhaps something else.
> 
> Peter, did you happen to see Eric's solution to this problem for
> namespaces? Basically, a per-userns sysctl instead of a global sysctl.
> Is that something that would be acceptable here?

Someone would have to educate me on what a userns is and how that would
help here.