linux-kernel - Re: Oops with tip/x86/fpu

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Message-ID: <55148B9E.1070203@intel.com>
Date:	Thu, 26 Mar 2015 15:43:42 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Oleg Nesterov <oleg@...hat.com>, Borislav Petkov <bp@...e.de>
CC:	Quentin Casasnovas <quentin.casasnovas@...cle.com>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Riikonen <priikone@....fi>,
	Rik van Riel <riel@...hat.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Oops with tip/x86/fpu

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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