From owner-freebsd-arch@FreeBSD.ORG Sun May 22 05:15:32 2005 Return-Path: X-Original-To: freebsd-arch@freebsd.org Delivered-To: freebsd-arch@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9809E16A41C for ; Sun, 22 May 2005 05:15:32 +0000 (GMT) (envelope-from cperciva@freebsd.org) Received: from pd4mo3so.prod.shaw.ca (shawidc-mo1.cg.shawcable.net [24.71.223.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 310C343D49 for ; Sun, 22 May 2005 05:15:32 +0000 (GMT) (envelope-from cperciva@freebsd.org) Received: from pd5mr6so.prod.shaw.ca (pd5mr6so-qfe3.prod.shaw.ca [10.0.141.182]) by l-daemon (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0IGV006U8L7RAP30@l-daemon> for freebsd-arch@freebsd.org; Sat, 21 May 2005 23:14:15 -0600 (MDT) Received: from pn2ml7so.prod.shaw.ca ([10.0.121.151]) by pd5mr6so.prod.shaw.ca (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0IGV00BYLL7R8GH0@pd5mr6so.prod.shaw.ca> for freebsd-arch@freebsd.org; Sat, 21 May 2005 23:14:15 -0600 (MDT) Received: from [192.168.0.60] (S0106006067227a4a.vc.shawcable.net [24.87.209.6]) by l-daemon (iPlanet Messaging Server 5.2 HotFix 1.18 (built Jul 28 2003)) with ESMTP id <0IGV00H5RL7Q9C@l-daemon> for freebsd-arch@freebsd.org; Sat, 21 May 2005 23:14:14 -0600 (MDT) Date: Sat, 21 May 2005 22:14:06 -0700 From: Colin Percival In-reply-to: <1116738628.867.33.camel@dirk.no.domain> To: Sam Lawrance Message-id: <4290151E.9020508@freebsd.org> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 7bit X-Accept-Language: en-us, en X-Enigmail-Version: 0.91.0.0 References: <428FC00B.3080909@freebsd.org> <428FD710.4060200@freebsd.org> <9e8314b53980a379445cc8c07086901d@xcllnt.net> <428FE788.8020408@freebsd.org> <42900C01.10904@freebsd.org> <429012D3.6070803@freebsd.org> <1116738628.867.33.camel@dirk.no.domain> User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050406) cc: freebsd-arch@freebsd.org Subject: Re: Scheduler fixes for hyperthreading X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 May 2005 05:15:32 -0000 Sam Lawrance wrote: > On Sat, 2005-05-21 at 22:04 -0700, Colin Percival wrote: >>Sam Lawrance wrote: >>>I'm just curious here... would the mac_seeotheruids policy help in >>>obscuring the value of any information collected by a spy process? >> >>Yes. It would mean that the spy could steal an SSL certificate, but >>not know whose SSL certificate it was. :-) > > Can the spy be sure that it's not just stealing fortunes though? > > I mean for example, can the cache timings shown on page 7 of your paper > be used to reliably identify what the other thread on the CPU is? Yes. The patterns are very distinctive. Colin Percival