Date: Sun, 22 May 2005 10:31:59 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Stephan Uphoff <ups@tree.com> Cc: Colin Percival <cperciva@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: Scheduler fixes for hyperthreading Message-ID: <40426.1116750719@critter.freebsd.dk> In-Reply-To: Your message of "Sat, 21 May 2005 22:44:25 EDT." <1116729865.1917.92.camel@palm>
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In message <1116729865.1917.92.camel@palm>, Stephan Uphoff writes: >Would it be enough to disable access to RDTSC for user processes? >I believe the attack needs a very exact time source. You'd be surprised how much software breaks if you do that :-( -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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