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Date: Mon, 2 Jul 2018 11:43:40 -0700
From: Kees Cook <keescook@...omium.org>
To: Chris von Recklinghausen <crecklin@...hat.com>
Cc: Laura Abbott <labbott@...hat.com>, Paolo Abeni <pabeni@...hat.com>, 
	LKML <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, 
	Kernel Hardening <kernel-hardening@...ts.openwall.com>, Josh Poimboeuf <jpoimboe@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3] add param that allows bootline control of hardened usercopy

On Sat, Jun 30, 2018 at 1:43 PM, Christoph von Recklinghausen
<crecklin@...hat.com> wrote:
> The last issue I'm chasing is build failures on ARCH=m68k. The error is
> atomic_read and friends needed by the jump label code not being found.
> The config has CONFIG_BROKEN_ON_SMP=y, so the jump label calls I added
> will only be made #ifndef CONFIG_BROKEN_ON_SMP. Do you think that's
> worth a mention in the blurb that's added to
> Documentation/admin-guide/kernel-parameters.txt?

Uhm, that's weird -- I think the configs on m68k need fixing then? I
don't want to have to sprinkle that ifdef in generic code.

How are other users of static keys and jump labels dealing with m68k weirdness?

-Kees

-- 
Kees Cook
Pixel Security

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