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Message-ID: <1305028354.2614.25.camel@edumazet-laptop>
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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