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

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Message-ID: <52D96149.8070706@zytor.com>
Date:	Fri, 17 Jan 2014 08:58:49 -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 08:56 AM, Borislav Petkov wrote:
> On Fri, Jan 17, 2014 at 08:51:31AM -0800, H. Peter Anvin wrote:
>> We shouldn't have any BOUND or MPX instructions in kernel space.  Panic.
> 
> How do we enforce that?

#BR exception from kernel space -> panic.

We have tons of rules on kernel code... e.g. no FPU usage.  This one is
minor in comparison.

	-hpa


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