linux-kernel - Re: [tip:x86/mm] x86, mm: NX protection for kernel data

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Message-ID: <20100222105457.GA31148@elte.hu>
Date:	Mon, 22 Feb 2010 11:54:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	mingo@...hat.com, hpa@...or.com, sliakh.lkml@...il.com,
	jmorris@...ei.org, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, tglx@...utronix.de, jiang@...ncsu.edu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86, mm: NX protection for kernel data


* tip-bot for Siarhei Liakh <sliakh.lkml@...il.com> wrote:

> Commit-ID:  01ab31371da90a795b774d87edf2c21bb3a64dda
> Gitweb:     http://git.kernel.org/tip/01ab31371da90a795b774d87edf2c21bb3a64dda
> Author:     Siarhei Liakh <sliakh.lkml@...il.com>
> AuthorDate: Sun, 31 Jan 2010 18:27:55 -0500
> Committer:  H. Peter Anvin <hpa@...or.com>
> CommitDate: Wed, 17 Feb 2010 10:11:24 -0800
> 
> x86, mm: NX protection for kernel data
> 
> This patch expands functionality of CONFIG_DEBUG_RODATA to set main
> (static) kernel data area as NX.

-tip testing is seeing boot hangs along the lines of:

[   15.568108] EXT3-fs (sda1): recovery complete
[   15.573064] EXT3-fs (sda1): mounted filesystem with ordered data mode
[   15.580313] VFS: Mounted root (ext3 filesystem) readonly on device 8:1.
[   15.584021] async_waiting @ 1
[   15.588008] async_continuing @ 1 after 0 usec
[   15.592163] Freeing unused kernel memory: 540k freed
[   15.600126] NX-protecting the kernel data: c15ab000, 2919 pages

which i suspect could be due to the commit above.

Config attached. Athlon64 testbox.

	Ingo

View attachment "config" of type "text/plain" (70552 bytes)