linux-kernel - Re: [kernel-hardening] Re: HalfSipHash Acceptable Usage

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Message-ID: <1482340101.8944.53.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 21 Dec 2016 09:08:21 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Rik van Riel <riel@...hat.com>
Cc:     kernel-hardening@...ts.openwall.com,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        George Spelvin <linux@...encehorizons.net>,
        Theodore Ts'o <tytso@....edu>, Andi Kleen <ak@...ux.intel.com>,
        David Miller <davem@...emloft.net>,
        David Laight <David.Laight@...lab.com>,
        "Daniel J . Bernstein" <djb@...yp.to>,
        Eric Biggers <ebiggers3@...il.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Netdev <netdev@...r.kernel.org>,
        Tom Herbert <tom@...bertland.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: [kernel-hardening] Re: HalfSipHash Acceptable Usage

On Wed, 2016-12-21 at 11:39 -0500, Rik van Riel wrote:

> Does anybody still have a P4?
> 
> If they do, they're probably better off replacing
> it with an Atom. The reduced power bills will pay
> for replacing that P4 within a year or two.

Well, maybe they have millions of units to replace.

> 
> In short, I am not sure how important the P4
> performance numbers are, especially if we can
> improve security for everybody else...

Worth adding that the ISN or syncookie generation are less than 10% of
the actual cost of handling a problematic (having to generate ISN or
syncookie) TCP packet anyway.

So we are talking of minors potential impact for '2000-era' cpus.

Definitely I vote for using SipHash in TCP ASAP.