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Message-ID: <CAHmME9pu-2CY2WRHevnpwo-9qnZcTpqQgC2voGFOpSjo+LPiUA@mail.gmail.com>
Date: Thu, 22 Dec 2016 16:29:14 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc: kernel-hardening@...ts.openwall.com, "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: Re: [PATCH v7 3/6] random: use SipHash in
place of MD5
On Thu, Dec 22, 2016 at 4:12 PM, Jason A. Donenfeld <Jason@...c4.com> wrote:
> 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.
Specifically something like this:
https://git.zx2c4.com/linux-dev/commit/?h=siphash&id=978213351f9633bd1e3d1fdc3f19d28e36eeac90
That only leaves two more uses of "cryptohash" to consider, but they
require a bit of help. First, sha_transform in net/ipv6/addrconf.c.
That might be a straight-forward conversion to SipHash, but perhaps
not; I need to look closely and think about it. The next is
sha_transform in kernel/bpf/core.c. I really have no idea what's going
on with the eBPF stuff, so that will take a bit longer to study. Maybe
sha1 is fine in the end there? I'm not sure yet.
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