linux-kernel - Re: Please pull my perf.git urgent branch

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Date:	Wed, 28 Jul 2010 11:15:38 -0500
From:	Kumar Gala <kumar.gala@...escale.com>
To:	Paul Mackerras <paulus@...ba.org>
CC:	Scott Wood <scottwood@...escale.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Please pull my perf.git urgent branch


On Jul 27, 2010, at 11:47 PM, Paul Mackerras wrote:

> On Tue, Jul 27, 2010 at 11:28:54AM -0500, Scott Wood wrote:
> 
>> Doesn't the setting of .period need to be maintained (it is in the other
>> powerpc perf_event implementation that this is derived from)?
> 
> Gah, yes it does.
> 
>> I don't see how this is a security fix -- the existing initializer above
>> should zero-fill the fields that are not explicitly initialized.  In fact,
>> it's taking other fields that were previously initialized to zero and is
>> making them uninitialized, since perf_sample_data_init only sets addr and
>> raw.
> 
> So I misunderstood how an initializer for an automatic struct works.
> Brown paper bag time for me... :(
> 
> Regarding the other fields, I assume Peter et al. have checked that
> they don't need to be cleared, so it's a microoptimization to not
> clear them.
> 
>> CCing linuxppc-dev on the original patch would have been nice...
> 
> True, but at least I can blame Peter Z. for that. :)
> 
> Kumar and Ben, how do you want to proceed on this one?

If we aren't concerned about an oops being generated lets just submit a patch for 2.6.36.

- k
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