Date: Thu, 22 Dec 2016 16:41:59 +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 Hi Hannes, On Thu, Dec 22, 2016 at 4:33 PM, Hannes Frederic Sowa <hannes@...essinduktion.org> wrote: > IPv6 you cannot touch anymore. The hashing algorithm is part of uAPI. > You don't want to give people new IPv6 addresses with the same stable > secret (across reboots) after a kernel upgrade. Maybe they lose > connectivity then and it is extra work? Ahh, too bad. So it goes. > The bpf hash stuff can be changed during this merge window, as it is > not yet in a released kernel. Albeit I would probably have preferred > something like sha256 here, which can be easily replicated by user > space tools (minus the problem of patching out references to not > hashable data, which must be zeroed). Oh, interesting, so time is of the essence then. Do you want to handle changing the new eBPF code to something not-SHA1 before it's too late, as part of a new patchset that can fast track itself to David? And then I can preserve my large series for the next merge window. Jason
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