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

On Fri, Mar 29, 2024 at 08:37:46AM -0400, Sasha Levin wrote:
> From: Kees Cook <[email protected]>
> 
> [ 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 <[email protected]>
> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
> Cc: Yoshinori Sato <[email protected]>
> Cc: Rich Felker <[email protected]>
> Cc: John Paul Adrian Glaubitz <[email protected]>
> Cc: Masahiro Yamada <[email protected]>
> Cc: Nicolas Schier <[email protected]>
> Cc:  <[email protected]>
> Link: https://lore.kernel.org/r/[email protected]
> Signed-off-by: Kees Cook <[email protected]>
> Signed-off-by: Sasha Levin <[email protected]>

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