linux-kernel - Re: [PATCH 00/11] x86: Supervisor Mode Access Prevention

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Message-ID: <5060C330.1000407@zytor.com>
Date:	Mon, 24 Sep 2012 13:31:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Linda Wang <lwang@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 00/11] x86: Supervisor Mode Access Prevention

On 09/22/2012 04:32 AM, Ingo Molnar wrote:
> 
> * H. Peter Anvin <hpa@...ux.intel.com> wrote:
> 
>> On 09/21/2012 03:08 PM, Dave Jones wrote:
>>>
>>> Perhaps add a printk somewhere to show that it's actually been enabled maybe ?
>>>
>>> Also, would it be feasible to add something like we have for test_nx ?
>>> If this feature regresses in some way in the future, I suspect we'd like
>>> to know about it sooner rather than later.
>>
>> Good idea... should add this both for SMEP and SMAP.
> 
> Very much agreed - these exploit preventation hardware features 
> are really useful, and it's good to inform the user that they 
> are active.
> 

I was thinking about this, do you think a printk would be better, or a
new field in /proc/cpuinfo?

	-hpa
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