linux-kernel - RE: [PATCH v7 09/10] x86, mpx: cleanup unused bound tables

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Date:	Thu, 24 Jul 2014 00:49:43 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	"Hansen, Dave" <dave.hansen@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: RE: [PATCH v7 09/10] x86, mpx: cleanup unused bound tables



On 2014-07-24, Hansen, Dave wrote:
> On 07/20/2014 10:38 PM, Qiaowei Ren wrote:
>> Since the kernel allocated those tables on-demand without userspace
>> knowledge, it is also responsible for freeing them when the
>> associated mappings go away.
>> 
>> Here, the solution for this issue is to hook do_munmap() to check
>> whether one process is MPX enabled. If yes, those bounds tables
>> covered in the virtual address region which is being unmapped will
>> be freed
> also.
> 
> This is the part of the code that I'm the most concerned about.
> 
> Could you elaborate on how you've tested this to make sure it works OK?

I can check a lot of debug information when one VMA and related bounds tables are allocated and freed through adding a lot of print() like log into kernel/runtime. Do you think this is enough?

Thanks,
Qiaowei
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