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

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Message-ID: <20160804155523.GO6879@twins.programming.kicks-ass.net>
Date:	Thu, 4 Aug 2016 17:55:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Micay <danielmicay@...il.com>
Cc:	kernel-hardening@...ts.openwall.com,
	Kees Cook <keescook@...omium.org>,
	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>,
	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 Thu, Aug 04, 2016 at 11:44:28AM -0400, Daniel Micay wrote:

> This feature doesn't come from Android. The perf events subsystem in the
> mainline kernel is packed full of vulnerabilities too. 

Uhh, not so much. I spend a _lot_ of time a while back to get the core
and x86 solid. I could run the fuzzers for hours on end at some point.

> The problem is so bad that pointing one of the public fuzzers at it
> for a short period of time is all that's required to start finding
> them.

If you know of any that reproduce on x86 I'll go fix. For anything else
you need to complain elsewhere as I don't have hardware nor bandwidth.