From: Jason Cooper <git@lakedaemon.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Jeff King <peff@peff.net>,
Ian Jackson <ijackson@chiark.greenend.org.uk>,
Joey Hess <id@joeyh.name>, Git Mailing List <git@vger.kernel.org>
Subject: Re: SHA1 collisions found
Date: Sun, 26 Feb 2017 01:13:59 +0000 [thread overview]
Message-ID: <20170226011359.GI11350@io.lakedaemon.net> (raw)
In-Reply-To: <xmqqinnyztqe.fsf@gitster.mtv.corp.google.com>
Hi Junio,
On Fri, Feb 24, 2017 at 10:10:01PM -0800, Junio C Hamano wrote:
> I was thinking we would need mixed mode support for smoother
> transition, but it now seems to me that the approach to stratify the
> history into old and new is workable.
As someone looking to deploy (and having previously deployed) git in
unconventional roles, I'd like to add one caveat. The flag day in the
history is great, but I'd like to be able to confirm the integrity of
the old history.
"Counter-hashing" the blobs is easy enough, but the trees, commits and
tags would need to have, iiuc, some sort of cross-reference. As in my
previous example, "git tag -v v3.16" also checks the counter hash to
further verify the integrity of the history (yes, it *really* needs to
check all of the old hashes, but I'd like to make sure I can do step one
first).
Would there be opposition to counter-hashing the old commits at the flag
day?
thx,
Jason.
next prev parent reply other threads:[~2017-02-26 1:14 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-23 16:43 SHA1 collisions found Joey Hess
2017-02-23 17:00 ` David Lang
2017-02-23 17:02 ` Junio C Hamano
2017-02-23 17:12 ` David Lang
2017-02-23 20:49 ` Jakub Narębski
2017-02-23 20:57 ` Jeff King
2017-02-23 17:18 ` Junio C Hamano
2017-02-23 17:35 ` Joey Hess
2017-02-23 17:52 ` Linus Torvalds
2017-02-23 18:21 ` Joey Hess
2017-02-23 18:31 ` Joey Hess
2017-02-23 19:13 ` Morten Welinder
2017-02-24 15:52 ` Geert Uytterhoeven
2017-02-23 18:40 ` Linus Torvalds
2017-02-23 18:46 ` Jeff King
2017-02-23 19:09 ` Linus Torvalds
2017-02-23 19:32 ` Jeff King
2017-02-23 19:47 ` Linus Torvalds
2017-02-23 19:57 ` Jeff King
[not found] ` <alpine.LFD.2.20.1702231428540.30435@i7.lan>
2017-02-23 22:43 ` Jeff King
2017-02-23 22:50 ` Linus Torvalds
2017-02-23 23:05 ` Jeff King
2017-02-23 23:05 ` [PATCH 1/3] add collision-detecting sha1 implementation Jeff King
2017-02-23 23:15 ` Stefan Beller
2017-02-24 0:01 ` Jeff King
2017-02-24 0:12 ` Linus Torvalds
2017-02-24 0:16 ` Jeff King
2017-02-23 23:05 ` [PATCH 2/3] sha1dc: adjust header includes for git Jeff King
2017-02-23 23:06 ` [PATCH 3/3] Makefile: add USE_SHA1DC knob Jeff King
2017-02-24 18:36 ` HW42
2017-02-24 18:57 ` Jeff King
2017-02-23 23:14 ` SHA1 collisions found Linus Torvalds
2017-02-28 18:41 ` Junio C Hamano
2017-02-28 19:07 ` Junio C Hamano
2017-02-28 19:20 ` Jeff King
2017-03-01 8:57 ` Dan Shumow
2017-02-28 19:34 ` Linus Torvalds
2017-02-28 19:52 ` Shawn Pearce
2017-02-28 22:56 ` Linus Torvalds
2017-02-28 21:22 ` Dan Shumow
2017-02-28 22:50 ` Marc Stevens
2017-02-28 23:11 ` Linus Torvalds
2017-03-01 19:05 ` Jeff King
2017-02-23 20:47 ` Øyvind A. Holm
2017-02-23 20:46 ` Joey Hess
2017-02-23 18:42 ` Jeff King
2017-02-23 17:52 ` David Lang
2017-02-23 19:20 ` David Lang
2017-02-23 17:19 ` Linus Torvalds
2017-02-23 17:29 ` Linus Torvalds
2017-02-23 18:10 ` Joey Hess
2017-02-23 18:29 ` Linus Torvalds
2017-02-23 18:38 ` Junio C Hamano
2017-02-24 9:42 ` Duy Nguyen
2017-02-25 19:04 ` brian m. carlson
2017-02-27 13:29 ` René Scharfe
2017-02-28 13:25 ` brian m. carlson
2017-02-24 15:13 ` Ian Jackson
2017-02-24 17:04 ` ankostis
2017-02-24 17:23 ` Jason Cooper
2017-02-25 23:22 ` ankostis
2017-02-24 17:32 ` Junio C Hamano
2017-02-24 17:45 ` David Lang
2017-02-24 18:14 ` Junio C Hamano
2017-02-24 18:58 ` Stefan Beller
2017-02-24 19:20 ` Junio C Hamano
2017-02-24 20:05 ` ankostis
2017-02-24 20:32 ` Junio C Hamano
2017-02-25 0:31 ` ankostis
2017-02-26 0:16 ` Jason Cooper
2017-02-26 17:38 ` brian m. carlson
2017-02-26 19:11 ` Linus Torvalds
2017-02-26 21:38 ` Ævar Arnfjörð Bjarmason
2017-02-26 21:52 ` Jeff King
2017-02-27 13:00 ` Transition plan for git to move to a new hash function Ian Jackson
2017-02-27 14:37 ` Why BLAKE2? Markus Trippelsdorf
2017-02-27 15:42 ` Ian Jackson
2017-02-27 19:26 ` Transition plan for git to move to a new hash function Tony Finch
2017-02-28 21:47 ` brian m. carlson
2017-03-02 18:13 ` Ian Jackson
2017-03-04 22:49 ` brian m. carlson
2017-03-05 13:45 ` Ian Jackson
2017-03-05 23:45 ` brian m. carlson
2017-02-24 20:05 ` SHA1 collisions found Junio C Hamano
2017-02-24 20:33 ` Philip Oakley
2017-02-24 23:39 ` Jeff King
2017-02-25 0:39 ` Linus Torvalds
2017-02-25 0:54 ` Linus Torvalds
2017-02-25 1:16 ` Jeff King
2017-02-26 18:55 ` Junio C Hamano
2017-02-25 6:10 ` Junio C Hamano
2017-02-26 1:13 ` Jason Cooper [this message]
2017-02-26 5:18 ` Jeff King
2017-02-26 18:30 ` brian m. carlson
2017-03-02 21:46 ` Brandon Williams
2017-03-03 11:13 ` Jeff King
2017-03-03 14:54 ` Ian Jackson
2017-03-03 22:18 ` Jeff King
2017-03-02 19:55 ` Linus Torvalds
2017-03-02 20:43 ` Junio C Hamano
2017-03-02 21:21 ` Linus Torvalds
2017-03-02 21:54 ` Joey Hess
2017-03-02 22:27 ` Linus Torvalds
2017-03-03 1:50 ` Mike Hommey
2017-03-03 2:19 ` Linus Torvalds
2017-03-03 11:04 ` Jeff King
2017-03-03 21:47 ` Stefan Beller
2017-02-25 1:00 ` David Lang
2017-02-25 1:15 ` Stefan Beller
2017-02-25 1:21 ` Jeff King
2017-02-25 1:39 ` David Lang
2017-02-25 1:47 ` Jeff King
2017-02-25 1:56 ` David Lang
2017-02-25 2:28 ` Jacob Keller
2017-02-25 2:26 ` Jacob Keller
2017-02-25 5:39 ` grarpamp
2017-02-24 23:43 ` Ian Jackson
2017-02-25 0:06 ` Ian Jackson
2017-02-25 18:50 ` brian m. carlson
2017-02-25 19:26 ` Jeff King
2017-02-25 22:09 ` Mike Hommey
2017-02-26 17:38 ` brian m. carlson
2017-02-24 22:47 ` Jakub Narębski
2017-02-24 22:53 ` Santiago Torres
2017-02-24 23:05 ` Jakub Narębski
2017-02-24 23:24 ` Øyvind A. Holm
2017-02-24 23:06 ` Jeff King
2017-02-24 23:35 ` Jakub Narębski
2017-02-25 22:35 ` Lars Schneider
2017-02-26 0:46 ` Jeff King
2017-02-26 18:22 ` Junio C Hamano
2017-02-26 18:57 ` Thomas Braun
2017-02-26 21:30 ` Jeff King
2017-02-27 9:57 ` Geert Uytterhoeven
2017-02-27 10:43 ` Jeff King
2017-02-27 12:39 ` Morten Welinder
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