From: Simon Horman <horms-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>
To: Herbert Xu <herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
Cc: "dev-yBygre7rU0TnMu66kgdUjQ@public.gmane.org"
<dev-yBygre7rU0TnMu66kgdUjQ@public.gmane.org>,
"Fischer, Anna" <anna.fischer-VXdhtT5mjnY@public.gmane.org>,
"netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"jhs-jkUAjuhPggJWk0Htik3J/w@public.gmane.org"
<jhs-jkUAjuhPggJWk0Htik3J/w@public.gmane.org>,
David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Subject: Re: [GIT PULL v2] Open vSwitch
Date: Thu, 1 Dec 2011 17:06:20 +0900 [thread overview]
Message-ID: <20111201080620.GH18436@verge.net.au> (raw)
In-Reply-To: <20111201075237.GA12799-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
On Thu, Dec 01, 2011 at 03:52:37PM +0800, Herbert Xu wrote:
> On Thu, Dec 01, 2011 at 04:24:18PM +0900, Simon Horman wrote:
> >
> > So while I agree that optimizing the hash is a good idea. I don't believe
> > it is a bottle-neck at this point. Though I could be convinced otherwise if
> > long collision chains could be constructed with relatively few flows.
> > Something I had not considered until I rad your email just now.
>
> It's not an optimisation issue, but a security one. If you leave
> a hash like this with a constant seed, an attacker would have an
> infinite amount of time to find collisions.
>
> Rehashing isn't all that difficult.
Sorry for missing the point. Yes, I agree that rehashing makes a lot of sense.
next prev parent reply other threads:[~2011-12-01 8:06 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 21:30 [GIT PULL v2] Open vSwitch Jesse Gross
[not found] ` <1321911029-20707-1-git-send-email-jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2011-11-21 21:30 ` [PATCH v2 1/5] genetlink: Add genl_notify() Jesse Gross
2011-11-21 21:30 ` [PATCH v2 2/5] genetlink: Add lockdep_genl_is_held() Jesse Gross
2011-11-21 21:30 ` [PATCH v2 3/5] genetlink: Add rcu_dereference_genl and genl_dereference Jesse Gross
2011-11-21 21:30 ` [PATCH v2 4/5] vlan: Move vlan_set_encap_proto() to vlan header file Jesse Gross
2011-11-21 21:30 ` [PATCH v2 5/5] net: Add Open vSwitch kernel components Jesse Gross
[not found] ` <1321911029-20707-6-git-send-email-jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2011-11-21 21:59 ` Stephen Hemminger
[not found] ` <20111121135955.571254b1-We1ePj4FEcvRI77zikRAJc56i+j3xesD0e7PPNI6Mm0@public.gmane.org>
2011-11-21 23:18 ` Jesse Gross
[not found] ` <CAEP_g=8uoq7tJjUTAC_Sp3kOYwZJuKjD3J7Ratu67Kq56ZiyYA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-11-21 23:25 ` Stephen Hemminger
[not found] ` <20111121152518.79e82eb8-We1ePj4FEcvRI77zikRAJc56i+j3xesD0e7PPNI6Mm0@public.gmane.org>
2011-11-21 23:49 ` Michał Mirosław
2011-11-21 22:12 ` Stephen Hemminger
[not found] ` <20111121141235.71a5f8fd-We1ePj4FEcvRI77zikRAJc56i+j3xesD0e7PPNI6Mm0@public.gmane.org>
2011-11-21 23:23 ` Jesse Gross
2011-11-22 0:27 ` Stephen Hemminger
2011-11-22 17:03 ` Jesse Gross
2011-11-22 20:50 ` [GIT PULL v2] Open vSwitch David Miller
2011-11-22 23:18 ` Stephen Hemminger
[not found] ` <20111122151854.198da33d-We1ePj4FEcvRI77zikRAJc56i+j3xesD0e7PPNI6Mm0@public.gmane.org>
2011-11-23 5:34 ` Chris Wright
2011-11-23 7:54 ` Herbert Xu
[not found] ` <20111123075433.GA7928-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2011-11-23 8:12 ` Eric Dumazet
2011-11-23 8:21 ` Herbert Xu
2011-11-23 12:47 ` jamal
2011-11-23 12:55 ` Eric Dumazet
2011-11-23 13:44 ` Jamal Hadi Salim
2011-11-23 16:05 ` John Fastabend
[not found] ` <4ECD19AC.8090505-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2011-11-24 13:19 ` Jamal Hadi Salim
2011-11-27 19:34 ` Lennert Buytenhek
[not found] ` <20111127193438.GV795-OLH4Qvv75CYX/NnBR394Jw@public.gmane.org>
2011-11-27 21:31 ` jamal
2011-11-23 13:13 ` David Täht
[not found] ` <4ECCF17D.5020509-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-11-23 13:36 ` jamal
2011-11-23 14:15 ` Eric Dumazet
2011-11-24 13:04 ` Jamal Hadi Salim
2011-11-27 14:14 ` WANG Cong
2011-11-23 12:22 ` jamal
2011-11-28 13:04 ` Herbert Xu
[not found] ` <20111128130409.GB16828-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2011-11-28 13:54 ` Fischer, Anna
2011-11-28 14:51 ` Herbert Xu
[not found] ` <20111128145157.GA17678-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2011-11-30 6:21 ` Jesse Gross
2011-11-30 7:02 ` Herbert Xu
[not found] ` <20111130070219.GB32630-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2011-12-01 7:24 ` Simon Horman
2011-12-01 7:52 ` Herbert Xu
[not found] ` <20111201075237.GA12799-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
2011-12-01 8:06 ` Simon Horman [this message]
2011-12-02 23:00 ` Jesse Gross
[not found] ` <0199E0D51A61344794750DC57738F58E7586A74137-1IhDuF6AwYvulpxXP3Mx0dVKv6DIAtwysh7EHKopUjU@public.gmane.org>
2011-11-28 14:07 ` Issues with openflow protocol WAS(RE: " Jamal Hadi Salim
2011-11-28 18:44 ` Justin Pettit
[not found] ` <20124540-D566-41B0-B86F-0BCA19B948AA-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2011-11-28 18:54 ` Fischer, Anna
2011-11-28 22:55 ` Jamal Hadi Salim
2011-11-28 16:04 ` Ben Pfaff
[not found] ` <20111128160400.GB6349-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2011-11-28 18:52 ` Fischer, Anna
2011-11-28 14:02 ` Jamal Hadi Salim
2011-11-28 15:27 ` Martin Casado
2011-11-28 15:32 ` [ovs-dev] " Jamal Hadi Salim
2011-11-28 15:50 ` Martin Casado
2011-11-28 16:01 ` Ben Pfaff
[not found] ` <20111128160117.GA6349-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2011-11-28 22:21 ` Jamal Hadi Salim
2011-11-28 23:14 ` [ovs-dev] " Ben Pfaff
2011-11-30 6:18 ` Jesse Gross
2011-11-30 7:06 ` Herbert Xu
[not found] ` <CAEP_g=-+F8bpkb8Qe1bPk65PQVNxz+VO7NoUrBCw6=GDUFbOFg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-11-30 13:23 ` jamal
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