netdev - Re: [GIT PULL v2] Open vSwitch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20111130070219.GB32630@gondor.apana.org.au>
Date:	Wed, 30 Nov 2011 15:02:19 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jesse Gross <jesse@...ira.com>
Cc:	"Fischer, Anna" <anna.fischer@...com>,
	"jhs@...atatu.com" <jhs@...atatu.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [GIT PULL v2] Open vSwitch

On Tue, Nov 29, 2011 at 10:21:32PM -0800, Jesse Gross wrote:
>
> It's userspace which is managing the entries in the kernel hash table
> and it has some intelligence about aging out entries (and specifically
> about doing it more aggressively as the number of entries increases),
> so it's not really unbounded.  In practice, userspace actually keeps
> the number of entries much smaller than the maximum size of the table.

Right, I thought you would have something like this.

But I think you still need to rehash the table periodically, as
otherwise even with a limited number of entries and attacker could
construct long chains in a hash bucket, given enough time.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html