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

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Date:	Thu, 24 Jul 2008 20:22:03 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	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>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

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

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.
Without it all this memory goes to waste.  On a machine that's
doing a lot of networking this could save a signifcant amount
of memory.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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