Re: Oops with tip/x86/fpu

[Dave Hansen]

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?
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