netdev - Re: Where exactly will arch_fast

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Message-ID: <54808123.8000704@redhat.com>
Date:	Thu, 04 Dec 2014 16:43:31 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Thomas Graf <tgraf@...g.ch>
CC:	Herbert Xu <herbert@...dor.apana.org.au>,
	"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 12/04/2014 04:39 PM, Thomas Graf wrote:
> On 12/04/14 at 11:29pm, Herbert Xu wrote:
>> 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.
>
> Well, it's called fast hash and not secure hash ;-) but a clear hint
> definitely wouldn't hurt.

Hm, I thought the kernel doc on arch_fast_hash() in include/linux/hash.h
would give enough of a hint ...
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