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

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Date:	Tue, 19 Apr 2011 12:09:30 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	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>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [Bugme-new] [Bug 33502] New: Caught 64-bit read from uninitialized
 memory in __alloc_skb

On Tue, 19 Apr 2011, Eric Dumazet wrote:

> get_freepointer(s, object) can access to freed memory and kmemcheck
> triggers the fault, while this_cpu_cmpxchg_double() would presumably
> detect a change of tid and would not perform the freelist/tid change.

Sounds right. The new lockless patchset for slub that uses a locked
cmpxchg16b will make this behavior even more common since it will do more
speculative accesses.

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