linux-kernel - RE: [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT, PR_MPX_DISABLE

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Message-ID: <alpine.DEB.2.11.1410272137140.5308@nanos>
Date:	Mon, 27 Oct 2014 21:38:20 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	"Hansen, Dave" <dave.hansen@...el.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>
Subject: RE: [PATCH v9 10/12] x86, mpx: add prctl commands PR_MPX_ENABLE_MANAGEMENT,
 PR_MPX_DISABLE_MANAGEMENT

On Mon, 27 Oct 2014, Ren, Qiaowei wrote:
> On 2014-10-24, Thomas Gleixner wrote:
> > On Sun, 12 Oct 2014, Qiaowei Ren wrote:
> >> +int mpx_enable_management(struct task_struct *tsk) {
> >> +	struct mm_struct *mm = tsk->mm;
> >> +	void __user *bd_base = MPX_INVALID_BOUNDS_DIR;
> > 
> > What's the point of initializing bd_base here. I had to look twice to
> > figure out that it gets overwritten by task_get_bounds_dir()
> > 
> 
> I just want to put task_get_bounds_dir() outside mm->mmap_sem holding.

What you want is not interesting at all. What's interesting is what
you do and what you send for review.
 
Thanks,

	tglx
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