linux-hardening - Re: [PATCH 0/3] kbuild: remove many tool coverage variables

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Date: Mon, 13 May 2024 16:28:25 -0700
From: Kees Cook <keescook@...omium.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Marco Elver <elver@...gle.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Peter Oberparleiter <oberpar@...ux.ibm.com>,
	Roberto Sassu <roberto.sassu@...weicloud.com>,
	Johannes Berg <johannes@...solutions.net>,
	kasan-dev@...glegroups.com, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/3] kbuild: remove many tool coverage variables

On Tue, May 14, 2024 at 07:39:31AM +0900, Masahiro Yamada wrote:
> On Tue, May 14, 2024 at 3:48 AM Kees Cook <keescook@...omium.org> wrote:
> > I am worried about the use of "guess" and "most", though. :) Before, we
> > had some clear opt-out situations, and now it's more of a side-effect. I
> > think this is okay, but I'd really like to know more about your testing.
> 
> - defconfig for arc, hexagon, loongarch, microblaze, sh, xtensa
> - allmodconfig for the other architectures
> 
> (IIRC, allmodconfig failed for the first case, for reasons unrelated
> to this patch set, so I used defconfig instead.
> I do not remember what errors I observed)
> 
> I checked the diff of .*.cmd files.

Ah-ha, perfect! Thanks. :)

> > Did you find any cases where you found that instrumentation was _removed_
> > where not expected?
> 
> See the commit log of 1/3.

Okay, thanks. I wasn't sure if that was the complete set or just part of
the "most" bit. :)

Thanks! I think this should all be fine. I'm not aware of anything
melting down yet from these changes being in -next, so:

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook