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

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Message-ID: <CAHmME9r3zCE6zLsL9Jrp3a2D3mpH6oYEnz3BBerAGZXyJpr2mQ@mail.gmail.com>
Date:   Thu, 22 Dec 2016 17:16:47 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "Theodore Ts'o" <tytso@....edu>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        kernel-hardening@...ts.openwall.com,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        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

Hi Ted,

On Thu, Dec 22, 2016 at 4:58 PM, Theodore Ts'o <tytso@....edu> wrote:
> Can we do this as a separate series, please?  At this point, it's a
> completely separate change from a logical perspective, and we can take
> in the change through the random.git tree.
>
> Changes that touch files that are normally changed in several
> different git trees leads to the potential for merge conflicts during
> the linux-next integration and merge window processes.  Which is why
> it's generally best to try to isolate changes as much as possible.

Sure, I can separate things out.

Could you offer a bit of advice on how to manage dependencies between
patchsets during merge windows? I'm a bit new to the process.

Specifically, we how have 4 parts:
1. add siphash, and use it for some networking code. to: david miller's net-next
2. convert char/random to use siphash. to: ted ts'o's random-next
3. move lib/md5.c to static function in crypto/md5.c, remove entry
inside of linux/cryptohash.h. to: ??'s ??-next
4. move lib/halfmd4.c to static function in fs/ext/hash.c, remove
entry inside of linux/cryptohash.c. to: td ts'o's ext-next

Problem: 2 depends on 1, 3 depends on 1 & 2. But this can be
simplified into 3 parts:

1. add siphash, and use it for some networking code. to: david miller's net-next
2. convert char/random to use siphash, move lib/md5.c to static
function in crypto/md5.c, remove entry inside of linux/cryptohash.h.
to: ted ts'o's random-next
3. move lib/halfmd4.c to static function in fs/ext/hash.c, remove
entry inside of linux/cryptohash.c. to: td ts'o's ext-next

Problem: 2 depends on 1. Is that okay with you?

Also, would you like me to merge (3) and (2) of the second list into
one series for you?

Jason