Commit 576b1b7b authored by Heiko Carstens's avatar Heiko Carstens
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s390/vdso: Disable kstack erase 



For some reason gcc 8, 9, 10, and 11 generate a dynamic relocation in
vdso.so.dbg if CONFIG_KSTACK_ERASE is enabled:

>> arch/s390/kernel/vdso/vdso.so.dbg: dynamic relocations are not supported
   make[3]: *** [arch/s390/kernel/vdso/Makefile:54: arch/s390/kernel/vdso/vdso.so.dbg] Error 1

$ readelf -rW arch/s390/kernel/vdso/vdso.so.dbg

Relocation section '.rela.dyn' at offset 0x15c0 contains 1 entry:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
00000000000015f0  000000010000000b R_390_JMP_SLOT         0000000000000000 __sanitizer_cov_stack_depth + 0

Add $(DISABLE_KSTACK_ERASE) to vdso compile flags to fix this.

Reported-by: default avatarkernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202601070505.xQcLr5KV-lkp@intel.com/


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 9448598b

arch/s390/kernel/vdso/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -28,7 +28,7 @@ KBUILD_CFLAGS_VDSO := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAG 
KBUILD_CFLAGS_VDSO := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_VDSO))

KBUILD_CFLAGS_VDSO := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_VDSO))

KBUILD_CFLAGS_VDSO += -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables

KBUILD_CFLAGS_VDSO += -fno-stack-protector

KBUILD_CFLAGS_VDSO += -fno-stack-protector $(DISABLE_KSTACK_ERASE)

ldflags-y := -shared -soname=linux-vdso.so.1 \

	     --hash-style=both --build-id=sha1 -T