Re: [PATCH AUTOSEL 6.8 75/98] sh: Fix build with CONFIG_UBSAN=y

[Kees Cook]

On Fri, Mar 29, 2024 at 08:37:46AM -0400, Sasha Levin wrote:
> From: Kees Cook <keescook@xxxxxxxxxxxx>
> 
> [ Upstream commit e36b70fb8c707a0688960184380bc151390d671b ]
> 
> 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@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202401310416.s8HLiLnC-lkp@xxxxxxxxx/
> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> Cc: Rich Felker <dalias@xxxxxxxx>
> Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
> Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> Cc: Nicolas Schier <n.schier@xxxxxx>
> Cc:  <linux-sh@xxxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/20240130232717.work.088-kees@xxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

Same as the other:

This is harmless to backport, but doesn't do anything. (The UBSAN
changes needing this are only in Linus's tree.)

-Kees

-- 
Kees Cook