linux-kernel - Re: [RFC] perf: mmap2 not covering VM

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Message-ID: <20131002115826.GM26785@twins.programming.kicks-ass.net>
Date:	Wed, 2 Oct 2013 13:58:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [RFC] perf: mmap2 not covering VM_CLONE regions

On Wed, Oct 02, 2013 at 01:23:16PM +0200, Peter Zijlstra wrote:
> So the only thing I can come up with is something like the below;
> supposedly the sha hash mixing a boot time random seed and the mm
> pointer is enough to avoid it being a data leak.

That is, right until it becomes feasible to run 2^64 SHA1 computations.
I've actually no idea how hard that is given todays GPU assisted
efforts.

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