linux-kernel - Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate bound tables

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Message-ID: <52D95F93.3030000@zytor.com>
Date:	Fri, 17 Jan 2014 08:51:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Ren Qiaowei <qiaowei.ren@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate
 bound tables

On 01/17/2014 08:48 AM, Borislav Petkov wrote:
> On Fri, Jan 17, 2014 at 08:31:16AM -0800, H. Peter Anvin wrote:
>>  As long as the exception originates from user space there shouldn't
>> be any issue.
> 
> And if it originates from kernel space?
> 

We shouldn't have any BOUND or MPX instructions in kernel space.  Panic.

	-hpa

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