From: Thomas Graf <tgraf@suug.ch>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Daniel Borkmann <dborkman@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Theodore Ts'o <tytso@mit.edu>,
netdev@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Where exactly will arch_fast_hash be used
Date: Thu, 4 Dec 2014 15:39:38 +0000 [thread overview]
Message-ID: <20141204153938.GC32140@casper.infradead.org> (raw)
In-Reply-To: <20141204152929.GA22075@gondor.apana.org.au>
On 12/04/14 at 11:29pm, Herbert Xu wrote:
> On Thu, Dec 04, 2014 at 03:26:37PM +0000, Thomas Graf wrote:
> >
> > As Daniel pointed out, this work originated for the OVS edge use
> > case where security is of less concern and the rehashing is
> > sufficient. Identifying collisions is less of interest as the user
> > space fall back provides a greater surface for an attack.
>
> Well in that case the current setup I think is very misleading.
> It's inviting unsuspecting kernel developers to use it as a hash
> function for general hash tables, which AFAICS is something that
> it fails at miserably.
Well, it's called fast hash and not secure hash ;-) but a clear hint
definitely wouldn't hurt.
I wasn't aware of the distribution weakness of the lower bits. Do
you have a reference to more information?
next prev parent reply other threads:[~2014-12-04 15:39 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 8:11 Where exactly will arch_fast_hash be used Herbert Xu
2014-12-04 12:34 ` Hannes Frederic Sowa
2014-12-04 13:14 ` Daniel Borkmann
2014-12-04 15:26 ` Thomas Graf
2014-12-04 15:29 ` Herbert Xu
2014-12-04 15:39 ` Thomas Graf [this message]
2014-12-04 15:43 ` Daniel Borkmann
2014-12-04 15:47 ` Herbert Xu
2014-12-04 15:51 ` Daniel Borkmann
2014-12-04 15:56 ` David Laight
2014-12-04 16:10 ` Herbert Xu
-- strict thread matches above, loose matches on Subject: below --
2014-12-07 5:20 George Spelvin
2014-12-07 9:28 ` Herbert Xu
2014-12-07 10:02 ` George Spelvin
2014-12-07 12:51 ` Herbert Xu
2014-12-07 13:23 ` George Spelvin
2014-12-07 14:06 ` Hannes Frederic Sowa
2014-12-07 21:33 ` George Spelvin
2014-12-08 11:25 ` Hannes Frederic Sowa
2014-12-08 16:19 ` George Spelvin
2014-12-08 16:32 ` Hannes Frederic Sowa
2014-12-09 14:24 ` Herbert Xu
2014-12-07 13:14 ` Hannes Frederic Sowa
2014-12-07 13:30 ` George Spelvin
2014-12-07 13:41 ` Hannes Frederic Sowa
2014-12-07 13:52 ` Hannes Frederic Sowa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20141204153938.GC32140@casper.infradead.org \
--to=tgraf@suug.ch \
--cc=davem@davemloft.net \
--cc=dborkman@redhat.com \
--cc=herbert@gondor.apana.org.au \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=tytso@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).