linux-kernel - [3.2-stable] Suspend regression after "x86, 64bit, mm: Mark data/bss/brk to nx"

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Date:	Sun, 11 Jan 2015 21:16:23 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Kees Cook <keescook@...omium.org>, Yinghai Lu <yinghai@...nel.org>
Cc:	x86@...nel.org, stable <stable@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [3.2-stable] Suspend regression after "x86, 64bit, mm: Mark
 data/bss/brk to nx"

On Sun, 2015-01-11 at 00:23 +0000, Ben Hutchings wrote:
> Commit 45e2a9d4701d8c624d4a4bcdd1084eae31e92f58 ("x86, mm: Set NX across
> entire PMD at boot") has been backported to many stable branches:
> 
> v3.10.62: 0b15c16c4f4a x86, mm: Set NX across entire PMD at boot
> v3.12.35: 868b19cb0314 x86, mm: Set NX across entire PMD at boot
> v3.14.26: 1a829c59816e x86, mm: Set NX across entire PMD at boot
> v3.17.5: 6231385167e0 x86, mm: Set NX across entire PMD at boot
> v3.2.65: a5c187d92d2c x86, mm: Set NX across entire PMD at boot
> v3.13.11-ckt12: 3657489f7009 x86, mm: Set NX across entire PMD at boot
> v3.16.7-ckt3: de32229b546e x86, mm: Set NX across entire PMD at boot

Sorry, I think I booted the wrong version at the last step of bisection.
It was actually the previous commit on the 3.2.y branch, which was
commit 72212675d1c96f5db8ec6fb35701879911193158 upstream ("x86, 64bit,
mm: Mark data/bss/brk to nx") that introduced the regression.  I intend
to revert both of these.

Ben.

> Unfortunately, in 3.2.65 suspend/resume stopped working on at least some
> systems - specifically, the system would reboot when woken:
> 
> https://bugs.debian.org/774436 - Lenovo ThinkPad T530
> https://bugs.debian.org/774461 - Lenovo ThinkPad X230
> https://bugs.debian.org/774526 - ECS P4M900T-M2
> https://bugs.debian.org/775059 - ASUS X201EP
> 
> I could reproduce this on my own ASUS P8Z68-V LX and was able to bisect
> to the backport of this commit.
> 
> Assuming that this regression has not occurred on mainline or the other
> branches, I will revert this patch for 3.2.y unless someone can point
> out a missing dependency that I should apply.
> 
> Ben.
> 

-- 
Ben Hutchings
One of the nice things about standards is that there are so many of them.

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