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 16:26:31 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, casteyde.christian@...e.fr,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	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 09:05 -0500, Christoph Lameter a écrit :
> On Wed, 20 Apr 2011, Eric Dumazet wrote:
> 
> > > Then, just disable SLUB_CMPXCHG_DOUBLE if KMEMCHECK is defined, as I did in my first patch.
> 
> Ok your first patch seems to be the sanest approach.
> 
> >  {
> > @@ -1889,16 +1895,18 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
> >  	struct kmem_cache_cpu *c;
> >  #ifdef CONFIG_CMPXCHG_LOCAL
> >  	unsigned long tid;
> > -#else
> > +#endif
> > +#ifdef MASK_IRQ_IN_SLAB_ALLOC
> >  	unsigned long flags;
> >  #endif
> >
> 
> Yea well that does not bring us much.

Well, we keep the fast free path ?

only slab_alloc() would have to disable irqs for ~20 instructions.



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