linux-kernel - Re: [PATCH 0/2] Noinstr fixes for K[CA]SAN with GCOV

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Message-ID: <20251218095112.GX3707837@noisy.programming.kicks-ass.net>
Date: Thu, 18 Dec 2025 10:51:12 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Marco Elver <elver@...gle.com>, Kees Cook <kees@...nel.org>,
	Brendan Jackman <jackmanb@...gle.com>,
	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>,
	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Noinstr fixes for K[CA]SAN with GCOV

On Sat, Dec 13, 2025 at 08:59:44AM +0900, Ard Biesheuvel wrote:

> > After that I sat down and finally got around to implement the builtin
> > that should solve this once and for all, regardless of where it's
> > called: https://github.com/llvm/llvm-project/pull/172030
> > What this will allow us to do is to remove the
> > "K[AC]SAN_SANITIZE_noinstr.o := n" lines from the Makefile, and purely
> > rely on the noinstr attribute, even in the presence of explicit
> > instrumentation calls.
> >
> 
> Excellent! Thanks for the quick fix. Happy to test and/or look into
> the kernel side of this once this lands.

Well, would not GCC need to grow the same thing and then we must wait
until these versions are the minimum supported versions for sanitizer
builds.

I mean, the extension is nice, but I'm afraid we can't really use it
until much later :/