Date: Fri, 7 Nov 1997 22:03:48 +0100 (MET) From: Finn Arne Gangstad <finnag@guardian.no> To: hackers@FreeBSD.ORG Subject: Re: Newest Pentium bug (fatal) Message-ID: <Pine.LNX.3.95.971107214918.23770A-100000@lucifer.guardian.no> In-Reply-To: <3463605C.41C67EA6@whistle.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 7 Nov 1997, Julian Elischer wrote: > 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(); > } EEk - don't try this on a compaq armada 1510 - no hard reset button (that i can find) and power button is also soft power - so now I have to wait for the battery to go empty on me.. objdump --disassemble-all --show-raw-insn pentiumcrash.o Disassembly of section .data: 00000000 <x> f0 0f c7 c8 lock cmpxchg8b %eax Bleh - illegal address mode but why oh why does it have to hang :( - Finn Arne
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.LNX.3.95.971107214918.23770A-100000>