netdev - Re: Where exactly will arch_fast

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Message-ID: <20141204161058.GA22431@gondor.apana.org.au>
Date:	Fri, 5 Dec 2014 00:10:58 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Daniel Borkmann <dborkman@...hat.com>, Thomas Graf <tgraf@...g.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Theodore Ts'o <tytso@....edu>,
	"netdev@...r.kernel.org" <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 03:56:30PM +0000, David Laight wrote:
> 
> "This CRC algorithm used by this hash is 'linear', ie hash(a xor b) ==
> hash(a) xor hash(b). This means that it is relatively easy for a remote
> attacker to generate multiple items with the same hash."

The attacker could be local too, e.g., opening a netlink socket
can be done by any user and gets hashed in net/netlink/af_netlink.c.

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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