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

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Message-ID: <52D95AD4.6060603@zytor.com>
Date:	Fri, 17 Jan 2014 08:31:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Ren Qiaowei <qiaowei.ren@...el.com>
CC:	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 01/13/2014 02:38 AM, Borislav Petkov wrote:
> On Mon, Jan 13, 2014 at 11:17:15AM +0800, Ren Qiaowei wrote:
>> Yes, I run this with lockdep enabled.
> 
> Ok, but you still are doing memory allocation in the exception handler,
> AFAICT:
> 

Sure... what is the problem with that?  We do that in several other
exception handlers, e.g. #NM, and of course page faults.  As long as the
exception originates from user space there shouldn't be any issue.

	-hpa


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