Date: Fri, 07 Nov 1997 10:39:24 -0800 From: Julian Elischer <julian@whistle.com> To: hackers@freebsd.org Subject: Newest Pentium bug (fatal) Message-ID: <3463605C.41C67EA6@whistle.com>
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On a "genuine Intel" pentium (not pentium pro)
execution of the following sequence, 0xf0 0x0f 0xc7 0xc8
will stop the processor. This is doable from user mode and in
16bitmode, or in fact any mode.
try the following c program.
unsigned char x[] = { 0xfo, 0x0f, 0xc7, 0xc8 };
main ()
{
void (*f)(void) = x;
f();
}
We've checked:
K5... OK
P6... OK
P5... *SPLAT*
no idea about the pentium II or other pentium copies.
K6?
other pentium variants?
versions?
this one DEFINITLY dies:
CPU: Pentium (99.38-MHz 586-class CPU)
Origin = "GenuineIntel" Id = 0x525 Stepping=5
Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
share and enjoy..
julian
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