netdev - Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

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: <20080809142918.GA30387@gondor.apana.org.au>
Date:	Sat, 9 Aug 2008 22:29:18 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Wolfgang Walter <wolfgang.walter@...m.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"vegard.nossum@...il.com" <vegard.nossum@...il.com>,
	austin zhang <austin_zhang@...ux.intel.com>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

On Sat, Aug 09, 2008 at 08:38:30AM +0800, Herbert Xu wrote:
>
> If there is a significant degradation I suggest that we back out
> the FPU changes.  Making your competitor's processor go slow is
> not a nice thing to do, especially when you've just released a
> processor in the same space.

OK I take that back, Intel (and AMD) processors are equally affected
by this.  For a start, the newly added Intel crc32c driver suffers
from exactly the same problem since the instruction used is also
SSE.

According to

	http://softwarecommunity.intel.com/articles/eng/3788.htm

the Intel AES instructions are also SSE so they too will suffer
from this.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <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