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Message-ID: <494586ed5a0871cf7cfd005f513577952306a0bc.camel@physik.fu-berlin.de>
Subject: Re: [PATCH] sh: Fix build with CONFIG_UBSAN=y
From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: Kees Cook <keescook@chromium.org>, Yoshinori Sato
	 <ysato@users.sourceforge.jp>
Cc: kernel test robot <lkp@intel.com>, Rich Felker <dalias@libc.org>, 
 Masahiro Yamada <masahiroy@kernel.org>, Nicolas Schier <n.schier@avm.de>,
 linux-sh@vger.kernel.org,  linux-kernel@vger.kernel.org,
 linux-hardening@vger.kernel.org
Date: Wed, 31 Jan 2024 12:03:44 +0100
In-Reply-To: <20240130232717.work.088-kees@kernel.org>
References: <20240130232717.work.088-kees@kernel.org>
Autocrypt: addr=glaubitz@physik.fu-berlin.de; prefer-encrypt=mutual;
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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.
>=20
>   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'
>=20
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202401310416.s8HLiLnC-lkp@i=
ntel.com/
> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> Cc: Rich Felker <dalias@libc.org>
> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
> Cc: Masahiro Yamada <masahiroy@kernel.org>
> Cc: Nicolas Schier <n.schier@avm.de>
> Cc: linux-sh@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  arch/sh/boot/compressed/Makefile | 1 +
>  1 file changed, 1 insertion(+)
>=20
> diff --git a/arch/sh/boot/compressed/Makefile b/arch/sh/boot/compressed/M=
akefile
> index b5e29f99c02c..6c6c791a1d06 100644
> --- a/arch/sh/boot/compressed/Makefile
> +++ b/arch/sh/boot/compressed/Makefile
> @@ -12,6 +12,7 @@ targets :=3D vmlinux vmlinux.bin vmlinux.bin.gz vmlinux=
bin.bz2 \
>             vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo $(OBJECTS)
> =20
>  GCOV_PROFILE :=3D n
> +UBSAN_SANITIZE :=3D n
> =20
>  #
>  # 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

--=20
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913