From: Heiko Carstens <hca@xxxxxxxxxxxxx>
commit 938f0c35d7d93a822ab9c9728e3205e8e57409d0 upstream.
Nathan Chancellor reported a kernel build error on Fedora 39:
$ clang --version | head -1
clang version 16.0.5 (Fedora 16.0.5-1.fc39)
$ s390x-linux-gnu-ld --version | head -1
GNU ld version 2.40-1.fc39
$ make -skj"$(nproc)" ARCH=s390 CC=clang CROSS_COMPILE=s390x-linux-gnu- olddefconfig all
s390x-linux-gnu-ld: arch/s390/boot/startup.o(.text+0x5b4): misaligned symbol `_decompressor_end' (0x35b0f) for relocation R_390_PC32DBL
make[3]: *** [.../arch/s390/boot/Makefile:78: arch/s390/boot/vmlinux] Error 1
It turned out that the problem with misaligned symbols on s390 was fixed
with commit 80ddf5ce1c92 ("s390: always build relocatable kernel") for the
kernel image, but did not take into account that the decompressor uses its
own set of CFLAGS, which come without -fPIE.
Add the -fPIE flag also to the decompresser CFLAGS to fix this.
Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Tested-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reported-by: CKI <cki-project@xxxxxxxxxx>
Suggested-by: Ulrich Weigand <Ulrich.Weigand@xxxxxxxxxx>
Link: https://github.com/ClangBuiltLinux/linux/issues/1747
Link: https://lore.kernel.org/32935.123062114500601371@xxxxxxxxxxxxxxxxxxxxxxxx/
Link: https://lore.kernel.org/r/20230622125508.1068457-1-hca@xxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/Makefile | 1 +
1 file changed, 1 insertion(+)
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -29,6 +29,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += -fno-delet
KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
+KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
