linux-kernel - Re: [1/2] 2.6.22-rc5: known regressions with patches

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Date:	Thu, 21 Jun 2007 16:35:10 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ian McDonald <ian.mcdonald@...di.co.nz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Ingo Molnar <mingo@...e.hu>,
	"Darrick J. Wong" <djwong@...ibm.com>, Andi Kleen <ak@...e.de>,
	Bj?rn Steinbrink <B.Steinbrink@....de>,
	William Cohen <wcohen@...hat.com>,
	"S. P. Prasanna" <prasanna@...ibm.com>,
	Antonino Daplas <adaplas@...il.com>,
	Olaf Hering <olaf@...fle.de>, Ville Syrj?l? <syrjala@....fi>,
	Jean Delvare <khali@...ux-fr.org>,
	Rudolf Marek <r.marek@...embler.cz>,
	Soeren Sonnenburg <kernel@....de>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: [1/2] 2.6.22-rc5: known regressions with patches

Arjan van de Ven wrote:
> --- linux-2.6.22-rc5/arch/i386/Kconfig.debug.org	2007-06-20 22:20:30.000000000 -0700
> +++ linux-2.6.22-rc5/arch/i386/Kconfig.debug	2007-06-20 22:20:55.000000000 -0700
> @@ -49,7 +49,6 @@ config DEBUG_PAGEALLOC
>  config DEBUG_RODATA
>  	bool "Write protect kernel read-only data structures"
>  	depends on DEBUG_KERNEL
> -	depends on !KPROBES # temporary for 2.6.22
>  	help
>  	  Mark the kernel read-only data as write-protected in the pagetables,
>  	  in order to catch accidental (and incorrect) writes to such const
> --- linux-2.6.22-rc5/arch/x86_64/Kconfig.debug.org	2007-06-20 22:20:28.000000000 -0700
> +++ linux-2.6.22-rc5/arch/x86_64/Kconfig.debug	2007-06-20 22:20:44.000000000 -0700
> @@ -9,7 +9,6 @@ source "lib/Kconfig.debug"
>  config DEBUG_RODATA
>         bool "Write protect kernel read-only data structures"
>         depends on DEBUG_KERNEL
> -       depends on !KPROBES # temporary for 2.6.22
>         help
>  	 Mark the kernel read-only data as write-protected in the pagetables,
>  	 in order to catch accidental (and incorrect) writes to such const data.

Shouldn't we add something to the help texts?

+	This option also marks kernel text pages as write-protected,
+	except if you enable KPROBES.

CMIIW.

As mentioned elsewhere in this thread, replacing CONFIG_DEBUG_RODATA by
CONFIG_WRITEPROTECT_RODATA and CONFIG_WRITEPROTECT_TEXT might be a
better idea.  The latter should be mutual exclusive with CONFIG_KPROBES.
-- 
Stefan Richter
-=====-=-=== -==- =-=-=
http://arcgraph.de/sr/
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