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

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Date:	Mon, 22 Feb 2010 18:21:53 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	mingo@...hat.com, sliakh.lkml@...il.com, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, arjan@...ux.intel.com,
	tglx@...utronix.de, jiang@...ncsu.edu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86, mm: NX protection for kernel data


* H. Peter Anvin <hpa@...or.com> wrote:

> On 02/22/2010 03:01 AM, Ingo Molnar 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.
> > 
> > Yep, that's confirmed now, applying these 3 reverts makes it boot fine:
> > 
> > 833e0ca: Revert "x86, mm: NX protection for kernel data"
> > ce4b6b4: Revert "x86: RO/NX protection for loadable kernel modules"
> > e357312: Revert "module: fix () used as prototype in include/linux/module.h"
> > 
> 
> Given that e357312 is a () -> (void) prototype fix, is hardly seems
> likely to be at fault.  The RO/NX stuff, on the other hand, make a lot
> of sense.

Yes, i reverted e357312 because it was a dependent change.

Thanks,

	Ingo
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