linux-kernel - Re: [BUG] SLOB breaks Crypto

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Date:	Mon, 17 May 2010 18:17:14 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	michael-dev@...i-braun.de, Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Matt Mackall <mpm@...enic.com>,
	Atsushi Nemoto <anemo@....ocn.ne.jp>
Subject: Re: [BUG] SLOB breaks Crypto

On Fri, Mar 19, 2010 at 02:33, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Thu, Mar 18, 2010 at 10:24:41PM +0100, michael-dev@...i-braun.de wrote:
>>
>> Pekka Enberg schrieb:
>> > Even with CONFIG_DEBUG_SLAB enabled or with CONFIG_SLUB and
>> > CONFIG_SLUB_DEBUG_ON?
>>
>> no, these options have not been / are not enabled.
>
> Can you please try it with those options enabled? That will tell
> us if there is some latent bug in the crypto layer that only shows
> up right away under SLOB.

After seeing a posting from Nemoto-san on the linux-mips list (should
show up soon on
http://www.linux-mips.org/archives/linux-mips/2010-05/threads.html),
I'm wondering if these defaults are the culprit;

mm/slab.c:#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
mm/slob.c:#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long)
mm/slub.c:#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)

Note that some platforms override this.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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