Re: [PATCH] sh: Fix build with CONFIG_UBSAN=y

[John Paul Adrian Glaubitz]

Hi Yujie,

On Fri, 2024-03-01 at 05:46 +0000, Liu, Yujie wrote:
> On Wed, 2024-02-14 at 13:52 +0100, John Paul Adrian Glaubitz wrote:
> > Hi Kees,
> > 
> > On Mon, 2024-02-12 at 19:45 +0100, John Paul Adrian Glaubitz wrote:
> > > On Mon, 2024-02-12 at 10:26 -0800, Kees Cook wrote:
> > > > > I just wanted to try reproduce the problem again with the reproducer in [1] as well
> > > > > as with gcc-13.2.0, but your branch devel/overflow/ubsan-only no longer exists.
> > > > > 
> > > > > Can you tell me where to find the patches now?
> > > > 
> > > > Sure, they're in -next, but for an -rc2 based tree, see:
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=for-next/kspp
> > > 
> > > OK, thanks. I will give it a try with gcc-13.
> > 
> > I'm still unable to reproduce the error that the kernel test robot reported.
> > 
> > I'm using gcc-13:
> > 
> > glaubitz@node54:/data/home/glaubitz/linux-kees> sh4-linux-gcc
> > sh4-linux-gcc: fatal error: no input files
> > compilation terminated.
> > glaubitz@node54:/data/home/glaubitz/linux-kees> sh4-linux-gcc --version
> > sh4-linux-gcc (GCC) 13.2.0
> > Copyright (C) 2023 Free Software Foundation, Inc.
> > This is free software; see the source for copying conditions.  There is NO
> > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> > 
> > glaubitz@node54:/data/home/glaubitz/linux-kees>
> > 
> > I checked out your tree and the for-next/kspp branch.
> > 
> > Then fetched the config that triggered the bug like this:
> > 
> > $ wget https://download.01.org/0day-ci/archive/20240131/202401310416.s8HLiLnC-lkp@xxxxxxxxx/config -O .config
> > 
> > Building the kernel with "make -j32 uImage" works fine. No errors except for
> > some unreleated warnings that still need to be fixed.
> 
> Sorry for late reply. Seems like the warnings can be reproduced by
> "make zImage" which is the default make target, but cannot be
> reproduced by "make uImage".
> 
> HEAD is now at 918327e9b7ffb ubsan: Remove CONFIG_UBSAN_SANITIZE_ALL
> 
> $ wget https://download.01.org/0day-ci/archive/20240131/202401310416.s8HLiLnC-lkp@xxxxxxxxx/config -O .config
> $ sh4-linux-gcc --version
> sh4-linux-gcc (GCC) 13.2.0
> 
> $ make -j72 CROSS_COMPILE=sh4-linux- ARCH=sh olddefconfig
> $ make -j72 CROSS_COMPILE=sh4-linux- ARCH=sh
> ...
>   LD      arch/sh/boot/compressed/vmlinux
> 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'
> sh4-linux-ld: arch/sh/boot/compressed/misc.o: in function `inflate_fast':
> misc.c:(.text+0xc5c): undefined reference to `__ubsan_handle_shift_out_of_bounds'
> sh4-linux-ld: arch/sh/boot/compressed/misc.o: in function `zlib_inflateReset':
> misc.c:(.text+0xd00): undefined reference to `__ubsan_handle_shift_out_of_bounds'
> sh4-linux-ld: arch/sh/boot/compressed/misc.o: in function `zlib_inflate':
> misc.c:(.text+0x23fc): undefined reference to `__ubsan_handle_shift_out_of_bounds'
> sh4-linux-ld: arch/sh/boot/compressed/ashldi3.o: in function `__ashldi3':
> ashldi3.c:(.text+0xc8): undefined reference to `__ubsan_handle_shift_out_of_bounds'
> make[3]: *** [arch/sh/boot/compressed/Makefile:38: arch/sh/boot/compressed/vmlinux] Error 1
> make[2]: *** [arch/sh/boot/Makefile:40: arch/sh/boot/compressed/vmlinux] Error 2
> make[1]: *** [arch/sh/Makefile:170: zImage] Error 2
> make: *** [Makefile:240: __sub-make] Error 2
> 
> $ make -j72 CROSS_COMPILE=sh4-linux- ARCH=sh uImage
> ...
>   OBJCOPY arch/sh/boot/vmlinux.bin
>   GZIP    arch/sh/boot/vmlinux.bin.gz
>   UIMAGE  arch/sh/boot/uImage.gz
> Image Name:   Linux-6.8.0-rc2+
> Created:      Fri Mar  1 13:31:36 2024
> Image Type:   SuperH Linux Kernel Image (gzip compressed)
> Data Size:    9297141 Bytes = 9079.24 KiB = 8.87 MiB
> Load Address: 08001000
> Entry Point:  08002000
>   Image arch/sh/boot/uImage is ready

Thanks a lot for pointing this out. This explains the problem.

I will have another look over the weekend and acknowledge the patch if Kees wants
to pick it up through his own tree.

Adrian

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