On Thu, Mar 07, 2024 at 04:38:20PM +0100, Sumanth Korikkar wrote:
> From d6641b8492ade37709a7099cea0ef71f29d062d0 Mon Sep 17 00:00:00 2001
> From: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
> Date: Thu, 7 Mar 2024 09:46:11 +0100
> Subject: [PATCH] s390/tools: handle rela R_390_GOTPCDBL/R_390_GOTOFF64
>
> lkp test robot reported unhandled relocation type: R_390_GOTPCDBL, when
> kernel is built with -fno-PIE. relocs tool reads vmlinux and handles
> absolute relocations. PC relative relocs doesn't need adjustment.
>
> Also, the R_390_GOTPCDBL/R_390_GOTOFF64 relocations are present
> currently only when KASAN is enabled.
>
> The following program can create a R_390_GOTPCDBL/R_390_GOTOFF64 reloc
> (with fPIE/fPIC).
>
> void funcb(int *b) {
> *b = *b + 100;
> }
>
> void gen_gotoff(void)
> {
> int b = 10;
> funcb (&b);
> }
>
> gcc -c sample.c -fPIC -fsanitize=kernel-address --param asan-stack=1
>
> The above example (built with -fPIC) was linked to one of the
> built-in.a (built with -fno-PIE) and checked for correctness with kaslr
> enabled. Both the relocs turns out relative and can be skipped.
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202402221404.T2TGs8El-lkp@xxxxxxxxx/
> Fixes: 55dc65b46023 ("s390: add relocs tool")
> Signed-off-by: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
> ---
> arch/s390/tools/relocs.c | 2 ++
> 1 file changed, 2 insertions(+)
Applied, thanks!
