RE: Oops with tip/x86/fpu

[Yu, Fenghua]

> From: Hansen, Dave
> Sent: Thursday, March 26, 2015 3:44 PM
> On 03/26/2015 03:37 PM, Yu, Fenghua wrote:
> >> > void sighup(int sig, siginfo_t *info, void *ctxt) {
> >> > 	struct ucontext *uctxt = ctxt;
> >> > 	struct sigcontext *sctxt = (void*)&uctxt->uc_mcontext;
> >> >
> >> > 	printf("SIGHUP! %p\n", sctxt->fpstate);
> >> > 	sctxt->fpstate = (void *)1;
> > sctxt->fpstate=(void *)1 changes the fpstate pointer in the sigcontext. It
> will generate segfault and bad frame info in kernel.
> >
> > This is expected behavior, right? Is this still a valid test?
> 
> Just to be clear, I saw a full-on kernel panic induced from an unprivileged
> application.
> 
> Are you seeing something different?

I use latest tip tree. Maybe it has the fixes already. I see "bad frame" reported in kernel. Seems the issue has been fixed in tip tree.

Thanks.

-Fenghua
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