Date: Mon, 16 May 2005 21:47:33 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Colin Percival <cperciva@freebsd.org> Cc: Nate Lawson <nate@root.org> Subject: Re: cvs commit: src/sys/amd64/amd64 mp_machdep.c src/sys/amd64/include cpufunc.h src/sys/i386/i386 mp_machdep.c src/sys/i386/include cpufunc.h Message-ID: <1976.1116272853@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 15 May 2005 16:29:32 EDT." <4287B12C.9080903@freebsd.org>
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In message <4287B12C.9080903@freebsd.org>, Colin Percival writes: >Nate Lawson wrote: >> Every general-purpose machine has measurable timing side channels. The >> question is merely one of bandwidth. > >Absolutely. Most covert channels operate at up to a few kbps; this covert >channel operates at several Mbps. Not only that, but the measurement precision is much better than for more indirect inspection methods like ps(1). -- 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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