linux-hardening - Re: [PATCH] sh: Fix build with CONFIG

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Date: Wed, 31 Jan 2024 12:03:44 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Kees Cook <keescook@...omium.org>, Yoshinori Sato
	 <ysato@...rs.sourceforge.jp>
Cc: kernel test robot <lkp@...el.com>, Rich Felker <dalias@...c.org>, 
 Masahiro Yamada <masahiroy@...nel.org>, Nicolas Schier <n.schier@....de>,
 linux-sh@...r.kernel.org,  linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] sh: Fix build with CONFIG_UBSAN=y

Hi Kees,

On Tue, 2024-01-30 at 15:27 -0800, Kees Cook wrote:
> The early boot stub for sh had UBSan instrumentation present where it is
> not supported. Disable it for this part of the build.
> 
>   sh4-linux-ld: arch/sh/boot/compressed/misc.o: in function `zlib_inflate_table':
>   misc.c:(.text+0x670): undefined reference to `__ubsan_handle_shift_out_of_bounds'
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202401310416.s8HLiLnC-lkp@intel.com/
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Rich Felker <dalias@...c.org>
> Cc: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: Nicolas Schier <n.schier@....de>
> Cc: linux-sh@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  arch/sh/boot/compressed/Makefile | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/sh/boot/compressed/Makefile b/arch/sh/boot/compressed/Makefile
> index b5e29f99c02c..6c6c791a1d06 100644
> --- a/arch/sh/boot/compressed/Makefile
> +++ b/arch/sh/boot/compressed/Makefile
> @@ -12,6 +12,7 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 \
>             vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo $(OBJECTS)
>  
>  GCOV_PROFILE := n
> +UBSAN_SANITIZE := n
>  
>  #
>  # IMAGE_OFFSET is the load offset of the compression loader

Thanks for the patch. I'm looking into this now and will provide the review later.

Adrian

-- 
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