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Date: Thu, 30 Mar 2017 20:45:28 +0100
From: Russell King - ARM Linux <>
To: Kees Cook <>
Cc: Hoeun Ryu <>,
	"" <>,
	Andy Lutomirski <>, PaX Team <>,
	Emese Revfy <>, "" <>,
	Catalin Marinas <>,
	Will Deacon <>,
	Ard Biesheuvel <>,
	Christoffer Dall <>,
	Mark Rutland <>,
	Suzuki K Poulose <>,
	Laura Abbott <>, Hugh Dickins <>,
	Steve Capper <>,
	Ganapatrao Kulkarni <>,
	James Morse <>,
	Kefeng Wang <>,
	"" <>,
	LKML <>
Subject: Re: [RFCv2] arm64: support HAVE_ARCH_RARE_WRITE and

On Thu, Mar 30, 2017 at 12:38:15PM -0700, Kees Cook wrote:
> Great work! I think this will need some further changes, though, since
> it doesn't look to me like this would pass LKDTM's tests if it was
> built as a module. (This is missing from my ARM attempt too... I
> haven't figured out how to set the domain on the kernel modules...)

You're not going to be able to do it very easily.  The only way I can
think of achieving it would be to split the module area into one
chunk for text, one chunk for write-rare and one chunk for data.

I still think that using domains is a mistake for this - it's a good
solution for things that are contiguous and big (like userspace), but
not for small amounts of data (like module sections.)

RMK's Patch system:
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to

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