Re: [PATCH v3] add param that allows bootline control of hardened usercopy

From: Christoph von Recklinghausen
Date: Mon Jul 02 2018 - 14:55:42 EST

On 07/02/2018 02:43 PM, Kees Cook wrote:
> On Sat, Jun 30, 2018 at 1:43 PM, Christoph von Recklinghausen
> <crecklin@xxxxxxxxxx> 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
There's also CONFIG_JUMP_LABEL which is defined in x86_64 but not
defined in the m68k configs. I'll use that instead. In hindsight I
should have spotted that but didn't.