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Message-ID: <9fda57fc1b1ba6ad9bd6f7df3fb12674d0f4f940.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>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>, 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: Fri, 02 Feb 2024 12:06:22 +0100
In-Reply-To: <202402020228.BBEF7DAC@keescook>
References: <20240130232717.work.088-kees@kernel.org>
	 <494586ed5a0871cf7cfd005f513577952306a0bc.camel@physik.fu-berlin.de>
	 <fe057f57aba0f8a9040d4700d27f5bd478032925.camel@physik.fu-berlin.de>
	 <202402020228.BBEF7DAC@keescook>
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Hi Kees,

On Fri, 2024-02-02 at 02:32 -0800, Kees Cook wrote:
> On Wed, Jan 31, 2024 at 12:19:22PM +0100, John Paul Adrian Glaubitz wrote=
:
> > Hi Kees,
> >=20
> > On Wed, 2024-01-31 at 12:03 +0100, John Paul Adrian Glaubitz wrote:
> > > Hi Kees,
> > >=20
> > > 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_i=
nflate_table':
> > > >   misc.c:(.text+0x670): undefined reference to `__ubsan_handle_shif=
t_out_of_bounds'
> > > >=20
> > > > Reported-by: kernel test robot <lkp@intel.com>
> > > > Closes: https://lore.kernel.org/oe-kbuild-all/202401310416.s8HLiLnC=
-lkp@intel.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/compre=
ssed/Makefile
> > > > 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 v=
mlinux.bin.bz2 \
> > > >             vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo $(OBJEC=
TS)
> > > > =20
> > > >  GCOV_PROFILE :=3D n
> > > > +UBSAN_SANITIZE :=3D n
> > > > =20
> > > >  #
> > > >  # IMAGE_OFFSET is the load offset of the compression loader
> > >=20
> > > Thanks for the patch. I'm looking into this now and will provide the =
review later.
> >=20
> > I tried to reproduce the error using your tree and the branch devel/ove=
rflow/ubsan-only
> > minus the above patch and using the provided config but I'm unable to r=
eproduce the
> > error above.
> >=20
> > Am I missing anything?
>=20
> When I use GCC 13.2 (I'm specifically on Ubuntu 23.10) and the randconfig
> linked from the report:
> https://download.01.org/0day-ci/archive/20240131/202401310416.s8HLiLnC-lk=
p@intel.com/config
> (which is notably enabling CONFIG_UBSAN=3Dy and CONFIG_UBSAN_SHIFT=3Dy) t=
hen I
> see at the final link stage:
>=20
> /usr/bin/sh4-linux-gnu-ld: arch/sh/boot/compressed/misc.o: in function `z=
lib_inflate_table':
> misc.c:(.text+0x650): undefined reference to `__ubsan_handle_shift_out_of=
_bounds'
> ...
>=20
> After the patch, it's solved.

OK, let me test with gcc 13.x. My build host is currently running openSUSE =
Leap 15.5.

Adrian

--=20
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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