netdev - Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized memory in __alloc

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Date:	Wed, 20 Apr 2011 08:04:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, casteyde.christian@...e.fr,
	Vegard Nossum <vegardno@....uio.no>
Subject: Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from
 uninitialized memory in __alloc_skb

Le mercredi 20 avril 2011 à 08:56 +0300, Pekka Enberg a écrit :
> On 4/19/11 11:17 PM, Eric Dumazet wrote:
> > Le mardi 19 avril 2011 à 12:10 -0500, Christoph Lameter a écrit :
> >> On Tue, 19 Apr 2011, Eric Dumazet wrote:
> >>
> >>>   	}
> >>>   }
> >>>
> >>> -#ifdef CONFIG_CMPXCHG_LOCAL
> >>> +#if defined(CONFIG_CMPXCHG_LOCAL)&&  \
> >>> +	!defined(CONFIG_KMEMCHECK)&&  !defined(DEBUG_PAGEALLOC)
> >>> +#define SLUB_USE_CMPXCHG_DOUBLE
> >>> +#endif
> >>> +
> >>> +#ifdef SLUB_USE_CMPXCHG_DOUBLE
> >>>   #ifdef CONFIG_PREEMPT
> >>>   /*
> >> Ugg.. Isnt there some way to indicate to kmemcheck that a speculative
> >> access is occurring?
> > Yes, here is a totally untested patch (only compiled here), to keep
> > kmemcheck&  cmpxchg_double together.
> 
> Looks good to me! Can we get someone to test it as well?

I tested first patch, but was not able to trigger the fault anyway
without it. I'll try a bit more today if time permits...

It would be nice if Christian can reproduce the initial problem easily
and give us the steps...



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