linux-kernel - Re: [tip:perf/urgent] perf: Treat attr.config as u64 in perf_swevent

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Date:	Mon, 22 Apr 2013 08:33:04 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	mingo@...nel.org, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, acme@...stprotocols.net,
	tglx@...utronix.de, tt.rantala@...il.com
Subject: Re: [tip:perf/urgent] perf: Treat attr.config as u64 in
 perf_swevent_init()

On Thu, 18 Apr 2013, Peter Zijlstra wrote:

> On Mon, 2013-04-15 at 03:42 -0700, tip-bot for Tommi Rantala wrote:
> > Commit-ID:  8176cced706b5e5d15887584150764894e94e02f
> > Gitweb:     http://git.kernel.org/tip/8176cced706b5e5d15887584150764894e94e02f
> > Author:     Tommi Rantala <tt.rantala@...il.com>
> > AuthorDate: Sat, 13 Apr 2013 22:49:14 +0300
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Mon, 15 Apr 2013 11:42:12 +0200
> > 
> > perf: Treat attr.config as u64 in perf_swevent_init()
> > 
> > Trinity discovered that we fail to check all 64 bits of
> > attr.config passed by user space, resulting to out-of-bounds
> > access of the perf_swevent_enabled array in
> > sw_perf_event_destroy().
> 
> Gah, I so missed we could hide bits in the top word and then use them
> in _destroy().
> 
> The alternative is of course to also truncate to int in _destroy(), but
> yes keeping the natural size seems the best alternative.

has this been marked for stable now that it's in 3.9-rc8?  It's trivial to 
oops/lock the kernel with a few line program and the problem has been 
around a while.

Vince

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