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

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Message-Id: <200807242313.47041.nickpiggin@yahoo.com.au>
Date:	Thu, 24 Jul 2008 23:13:46 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	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

On Thursday 24 July 2008 23:04, Herbert Xu wrote:
> On Thu, Jul 24, 2008 at 10:56:08PM +1000, Nick Piggin wrote:
> > OTOH, skb allocation uses kmalloc don't they? So you could still use
> > SLOB ksize for that I guess.
>
> Yes I was referring to the data portion which is kmalloc'ed.
> That is also why I'm interested in ksize because a priori we
> don't know exactly how big it's going to be.  However, we do
> know that statistically 1500 will dominate.
>
> I'm not interested in ksize for kmem_cache at all.  So in fact
> we could have something simpler that's based on kmalloc's rounding
> algorithm instead.

Yes you could definitely have a function that returns allocated
bytes for a given kmalloc size. Should be about as fast or faster
than extracting the size from the kaddr...

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