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Message-ID: <c82ea5a2-3139-5f12-e5f7-df2e1a6d9c24@stressinduktion.org>
Date: Thu, 22 Dec 2016 21:02:29 +0100
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: Andy Lutomirski <luto@...nel.org>,
Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>,
"Jason A. Donenfeld" <Jason@...c4.com>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Theodore Ts'o <tytso@....edu>, 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: BPF hash algo (Re: Re: [PATCH v7 3/6] random:
use SipHash in place of MD5)
On 22.12.2016 20:56, Andy Lutomirski wrote:
> It's also not quite clear to me why userspace needs to be able to
> calculate the digest on its own. A bpf(BPF_CALC_PROGRAM_DIGEST)
> command that takes a BPF program as input and hashes it would seem to
> serve the same purpose, and that would allow the kernel to key the
> digest and change the algorithm down the road without breaking things.
I think that people expect digests of BPF programs to be stable over
time and reboots.
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