From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Subject: Re: [kernel-hardening] Re: [PATCH v7 3/6] random: use SipHash in
 place of MD5
Date: Thu, 22 Dec 2016 16:12:24 +0100
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Cc: kernel-hardening@lists.openwall.com,
        "Theodore Ts'o" <tytso@mit.edu>,
        Andy Lutomirski <luto@amacapital.net>,
        Netdev <netdev@vger.kernel.org>,
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        Eric Biggers <ebiggers3@gmail.com>,
        Tom Herbert <tom@herbertland.com>,
        Andi Kleen <ak@linux.intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
To: Hannes Frederic Sowa <hannes@stressinduktion.org>
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On Thu, Dec 22, 2016 at 4:05 PM, Hannes Frederic Sowa
<hannes@stressinduktion.org> wrote:
> This change would need a new version of the ext4 super block, because
> you should not change existing file systems.

Right.

As a first step, I'm considering adding a patch to move halfmd4.c
inside the ext4 domain, or at the very least, simply remove it from
linux/cryptohash.h. That'll then leave the handful of bizarre sha1
usages to consider.