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

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Date:	Tue, 10 May 2011 13:52:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <cl@...ux.com>, 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 mardi 10 mai 2011 à 13:19 +0300, Pekka Enberg a écrit :
> On 5/10/11 1:17 PM, Eric Dumazet wrote:
> > Le mardi 10 mai 2011 à 13:03 +0300, Pekka Enberg a écrit :
> >
> >> Can't we fix the issue by putting kmemcheck_mark_initialized() to
> >> set_freepointer()?
> >
> > This would solve kmemcheck problem, not DEBUG_PAGEALLOC
> 
> Oh, right. Christoph? We need to support DEBUG_PAGEALLOC with SLUB.


Maybe have a special version of "irqsafe_cpu_cmpxchg_double" and make it
use something like :


local_irq_save(flags);
if (probe_kernel_address(...)) {
	res = false;
} else {
	res = unsafe_cpu_cmpxchg_double(...)
	}
local_irq_restore(flags);

Just the idea, I dont have time to cook a patch.


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