linux-kernel - Re: [PATCH] kbuild: Switch from -Wvla to -Wvla-larger-than=0

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Message-Id: <174527103909.545282.5440977919378383304.b4-ty@kernel.org>
Date: Mon, 21 Apr 2025 14:30:41 -0700
From: Kees Cook <kees@...nel.org>
To: Christoph Hellwig <hch@....de>,
	Kees Cook <kees@...nel.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.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>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	kasan-dev@...glegroups.com,
	linux-mm@...ck.org,
	linux-kbuild@...r.kernel.org,
	llvm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] kbuild: Switch from -Wvla to -Wvla-larger-than=0

On Fri, 18 Apr 2025 14:32:39 -0700, Kees Cook wrote:
> Variable Length Arrays (VLAs) on the stack must not be used in the kernel.
> Function parameter VLAs[1] should be usable, but -Wvla will warn for
> those. For example, this will produce a warning but it is not using a
> stack VLA:
> 
>     int something(size_t n, int array[n]) { ...
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] kbuild: Switch from -Wvla to -Wvla-larger-than=0
      https://git.kernel.org/kees/c/9c2cfa10444c

Take care,

-- 
Kees Cook