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

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Message-ID: <CAGXu5jKK+BJnbzJy0pZxVG2BdgxdJ5vNChMRUAJdKrGaHCOsNg@mail.gmail.com>
Date:	Wed, 2 Oct 2013 12:38:54 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] perf: mmap2 not covering VM_CLONE regions

On Wed, Oct 2, 2013 at 12:00 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Oct 02, 2013 at 11:10:15AM -0700, Kees Cook wrote:
>> Seems like a simple enough solution. Surely there must be a catch. :)
>
> I didn't want to add this to the core mm just for perf..

It seems like it would be pretty inexpensive. It might also be
valuable in other situations. Not that I can think of any at the
moment. Additionally, it could likely be hidden by a CONFIG, so that
if perf isn't built in, there's no change?

-Kees

-- 
Kees Cook
Chrome OS Security
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