netdev - Re: [PATCH] net: implement emergency route cache rebulds when gc

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Message-ID: <20081005032047.GA11997@gondor.apana.org.au>
Date:	Sun, 5 Oct 2008 11:20:47 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Neil Horman <nhorman@...driver.com>
Cc:	netdev@...r.kernel.org, kuznet@....inr.ac.ru, davem@...emloft.net,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net
Subject: Re: [PATCH] net: implement emergency route cache rebulds when
	gc_elasticity is exceeded

On Sun, Oct 05, 2008 at 11:17:27AM +0800, Herbert Xu wrote:
> Neil Horman <nhorman@...driver.com> wrote:
> >        We currently have the ability to disable our route cache secret interval
> > rebuild timer (by setting it to zero), but if we do that its possible for an
> > attacker (if they guess our route cache hash secret, to fill our system with
> > routes that all hash to the same bucket, destroying our performance.  This patch
> 
> This is completely bogus.  We never allow any chain to grow beyond
> the elasticity.  So in the worst case we just bypass the route cache.

OK we don't actually enforce that as it stands, but perhaps we
should have a maximum chain length that is enforced.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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