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

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Message-ID: <fe057f57aba0f8a9040d4700d27f5bd478032925.camel@physik.fu-berlin.de>
Date: Wed, 31 Jan 2024 12:19:22 +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 Wed, 2024-01-31 at 12:03 +0100, John Paul Adrian Glaubitz wrote:
> 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.

I tried to reproduce the error using your tree and the branch devel/overflow/ubsan-only
minus the above patch and using the provided config but I'm unable to reproduce the
error above.

Am I missing anything?

Thanks,
Adrian

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