linux-hardening - Re: [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7: warning: argument to variable-length array may be too large due to conversion from 'int' to 'long unsigned int'

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Message-ID: <202505070847.F9BEC6E@keescook>
Date: Wed, 7 May 2025 08:48:53 -0700
From: Kees Cook <kees@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>,
	Christoph Hellwig <hch@....de>, Arnd Bergmann <arnd@...db.de>,
	linux-hardening@...r.kernel.org
Subject: Re: [kees:for-next/hardening 6/14] mm/kasan/kasan_test_c.c:1504:7:
 warning: argument to variable-length array may be too large due to
 conversion from 'int' to 'long unsigned int'

On Wed, May 07, 2025 at 02:08:26PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
> head:   48b79238694db6e7eb3dd6153cf71107db624a11
> commit: 1ca6c23046d30abfe57d8706248ad5888aafa3bf [6/14] kbuild: Switch from -Wvla to -Wvla-larger-than=1
> :::::: branch date: 33 hours ago
> :::::: commit date: 9 days ago
> config: arm64-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250507/202505071331.4iOzqmuE-lkp@intel.com/config)
> compiler: aarch64-linux-gcc (GCC) 8.5.0
> [...]
>    mm/kasan/kasan_test_c.c: At top level:
>    cc1: warning: unrecognized command line option '-Wno-vla-larger-than'

Man, GCC 8 and this option is pretty broken. I've update the patch
again to just do option removal instead of traditional warning
disabling:

https://web.git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=for-next/hardening&id=a81be1e542c0f35e171bc564d8b60785a12cff29

Thanks!

-- 
Kees Cook