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

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Message-ID: <530B9A54.5060502@zytor.com>
Date:	Mon, 24 Feb 2014 11:15:32 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Vince Weaver <vincent.weaver@...ne.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, "H.J. Lu" <hjl.tools@...il.com>
Subject: Re: perf_fuzzer compiled for x32 causes reboot

On 02/24/2014 11:13 AM, Steven Rostedt wrote:
>>
>> Either way, it really seems like we have a case of CR2 leakage out of
>> the NMI context.
> 
> Ah, and x86_64 saves off the cr2 register when entering NMI and restores
> it before returning. But it seems to be missing from the i386 code.
> 

OK, that might be a problem, but this is the 64-bit kernel.

	-hpa


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