netdev - Re: [PATCH RFC v1 2/3] ipv6: move from sha1 to blake2s in address calculation

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Date:   Thu, 13 Jan 2022 14:54:05 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        "open list:BPF JIT for MIPS (32-BIT AND 64-BIT)" 
        <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Erik Kline <ek@...gle.com>,
        Fernando Gont <fgont@...networks.com>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
Subject: Re: [PATCH RFC v1 2/3] ipv6: move from sha1 to blake2s in address calculation

On Thu, Jan 13, 2022 at 2:50 PM Ard Biesheuvel <ardb@...nel.org> wrote:
> > Then, at some point down the road, we can talk about removing
> > CONFIG_NET_OBSOLETE_INSECURE_ADDRCONF_HASH too.
> >
>
> What is the point of having CONFIG_OLD_N_CRUSTY if all distros are
> going to enable it indefinitely?

I think there's probably some combination of
CONFIG_NET_OBSOLETE_INSECURE_ADDRCONF_HASH and CONFIG_OLD_N_CRUSTY and
maybe even a CONFIG_GOD_MURDERS_KITTENS that might be sufficiently
disincentivizing? Or this ties into other general ideas on a gradual
obsolescence->removal flow for things.