linux-kernel - Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <84144f020807240540vbe7ef50uee2cacabe8016546@mail.gmail.com>
Date:	Thu, 24 Jul 2008 15:40:40 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Herbert Xu" <herbert@...dor.apana.org.au>
Cc:	"Patrick McHardy" <kaber@...sh.net>, "Ingo Molnar" <mingo@...e.hu>,
	"David Miller" <davem@...emloft.net>, w@....eu,
	davidn@...idnewall.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stefanr@...6.in-berlin.de,
	rjw@...k.pl, ilpo.jarvinen@...sinki.fi,
	"Dave Jones" <davej@...hat.com>, "Matt Mackall" <mpm@...enic.com>,
	"Christoph Lameter" <cl@...ux-foundation.org>
Subject: Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

Hi Herbert,

On Thu, Jul 24, 2008 at 02:03:50PM +0200, Patrick McHardy wrote:
>> Does reverting 31d8519c fix this?

On Thu, Jul 24, 2008 at 3:22 PM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> Regardless of whether this is the problem, banning ksize because
> it can be abused is like banning cars because they can kill people.
>
> For example, Ethernet skbs are 1500 bytes long, so using ksize
> we could potentially use the left-over memory for temporary storage.

Using ksize() for skbs will crash your kernel for some configurations
because calling that function for memory allocated with
kmem_cache_alloc() is not supported by all the allocators (well,
SLOB).

                                      Pekka
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