linux-kernel - Re: perf_fuzzer compiled for x32 causes reboot

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Date:	Mon, 24 Feb 2014 12:41:14 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf_fuzzer compiled for x32 causes reboot

On Mon, 24 Feb 2014, Vince Weaver wrote:

> I do note that 
> 	perf_callchain_user();
> 
> Does
> 	fp = (void __user *)regs->bp;
> 	
> 	...
> 
> 	bytes = copy_from_user_nmi(&frame, fp, sizeof(frame));
> 
> 
> And in my particular executable RBP has nothing to do with a frame 
> pointer, but is instead being used as a general purpose register.

and as a reminder, I'm seeing this on an x32 executable, so 
perf_callchain_user32() is probably coming into play.

So maybe it is an x32 issue after all.

Vince
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