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Date: Sat, 30 Nov 2019 08:48:23 -0800
From: Kees Cook <>
To: Mark Rutland <>
Cc: Kassad <>,
Subject: Re: Contributing to KSPP newbie

On Fri, Nov 29, 2019 at 11:29:13AM +0000, Mark Rutland wrote:
> On Thu, Nov 28, 2019 at 11:39:11PM -0500, Kassad wrote:
> > Hey Kees,
> > 
> > I'm 3rd university student interested in learning more about the linux kernel.
> > I'm came across this subsystem, since it aligns with my interest in security.
> > Do you think as a newbie this task will
> > be a good starting point?
> I think this specific task (Disable arm32 kuser helpers) has already
> been done, and the ticket is stale.

Oh, thank you! I entirely missed both of these commits. I've added
notes to the bug and closed it.

> On arm CONFIG_KUSER_HELPERS can be disabled on kernels that don't need
> to run on HW prior to ARMv6. See commit:
>   f6f91b0d9fd971c6 ("ARM: allow kuser helpers to be removed from the vector page")
> On arm64, CONFIG_KUSER_HELPERS can be disabled on any kernel. See
> commit:
>   1b3cf2c2a3f42b ("arm64: compat: Add KUSER_HELPERS config option")

(Typo: a1b3cf2c2a3f42b)


> Thanks,
> Mark.

Kees Cook

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