netdev - Re: Where exactly will arch_fast

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Message-ID: <20141204152929.GA22075@gondor.apana.org.au>
Date:	Thu, 4 Dec 2014 23:29:29 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Theodore Ts'o <tytso@....edu>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Where exactly will arch_fast_hash be used

On Thu, Dec 04, 2014 at 03:26:37PM +0000, Thomas Graf wrote:
>
> As Daniel pointed out, this work originated for the OVS edge use
> case where security is of less concern and the rehashing is
> sufficient. Identifying collisions is less of interest as the user
> space fall back provides a greater surface for an attack.

Well in that case the current setup I think is very misleading.
It's inviting unsuspecting kernel developers to use it as a hash
function for general hash tables, which AFAICS is something that
it fails at miserably.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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