Date: Sun, 15 May 2005 16:29:32 -0400 From: Colin Percival <cperciva@freebsd.org> To: Nate Lawson <nate@root.org> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/amd64/amd64 mp_machdep.csrc/sys/amd64/include cpufunc.h src/sys/i386/i386 mp_machdep.c src/sys/i386/include cpufunc.h Message-ID: <4287B12C.9080903@freebsd.org> In-Reply-To: <4287AD84.6070600@root.org> References: <97079.1116154766@critter.freebsd.dk> <4287AD84.6070600@root.org>
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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. The fact that this channel is many times faster than all the other channels combined makes it not just quantitatively different but also qualitatively different and deserving of more careful treatment. Colin Percival
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