linux-kernel - Re: [PATCH 3.2 056/185] mm: ensure get_unmapped_area() returns higher address than mmap_min

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Message-Id: <20140106191910.7155.38390934@jp.panasonic.com>
Date:	Mon, 06 Jan 2014 19:19:10 +0900
From:	Akira Takeuchi <takeuchi.akr@...panasonic.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Kiyoshi Owada <owada.kiyoshi@...panasonic.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3.2 056/185] mm: ensure get_unmapped_area() returns higher address than mmap_min_addr

On Fri, 03 Jan 2014 04:26:43 +0000
Ben Hutchings <ben@...adent.org.uk> wrote:

> On Sun, 2013-12-29 at 03:08 +0100, Ben Hutchings wrote:
> > 3.2.54-rc1 review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Akira Takeuchi <takeuchi.akr@...panasonic.com>
> > 
> > commit 2afc745f3e3079ab16c826be4860da2529054dd2 upstream.
> [...]
> > [bwh: Backported to 3.2:
> >  As we do not have vm_unmapped_area(), make arch_get_unmapped_area_topdown()
> >  calculate the lower limit for the new area's end address and then compare
> >  addresses with this instead of with len.  In the process, fix an off-by-one
> >  error which could result in returning 0 if mm->mmap_base == len.]
> 
> I'm dropping this as I have no good way to test the backport (it's not
> used on x86) and I didn't get any confirmation that it's right.

I'm sorry for delayed reply.

Your backport seems right.
Additionally, I've confirmed the problem is resolved by your backport patch.


Best regards,
Akira Takeuchi

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