netdev - Re: [kernel-hardening] Re: [PATCH v7 3/6] random: use SipHash in place of MD5

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Date:   Thu, 22 Dec 2016 16:05:53 +0100
From:   Hannes Frederic Sowa <hannes@...essinduktion.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        kernel-hardening@...ts.openwall.com
Cc:     Theodore Ts'o <tytso@....edu>,
        Andy Lutomirski <luto@...capital.net>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        David Laight <David.Laight@...lab.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biggers <ebiggers3@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>
Subject: Re: [kernel-hardening] Re: [PATCH v7 3/6] random: use SipHash in
 place of MD5

On 22.12.2016 14:10, Jason A. Donenfeld wrote:
> On Thu, Dec 22, 2016 at 1:47 PM, Hannes Frederic Sowa
> <hannes@...essinduktion.org> wrote:
>> following up on what appears to be a random subject: ;)
>>
>> IIRC, ext4 code by default still uses half_md4 for hashing of filenames
>> in the htree. siphash seems to fit this use case pretty good.
> 
> I saw this too. I'll try to address it in v8 of this series.

This change would need a new version of the ext4 super block, because
you should not change existing file systems.