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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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576b1b7b11
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: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202601070505.xQcLr5KV-lkp@intel.com/
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
77 lines
2.6 KiB
Makefile
77 lines
2.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# List of files in the vdso
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# Include the generic Makefile to check the built vdso.
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include $(srctree)/lib/vdso/Makefile.include
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obj-vdso = vdso_user_wrapper.o note.o vgetrandom-chacha.o
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obj-cvdso = vdso_generic.o getcpu.o vgetrandom.o
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VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE)
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CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE)
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CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE)
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CFLAGS_REMOVE_vdso_generic.o = $(VDSO_CFLAGS_REMOVE)
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ifneq ($(c-getrandom-y),)
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CFLAGS_vgetrandom.o += -include $(c-getrandom-y)
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endif
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# Build rules
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targets := $(obj-vdso) $(obj-cvdso) vdso.so vdso.so.dbg
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
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obj-cvdso := $(addprefix $(obj)/, $(obj-cvdso))
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KBUILD_AFLAGS_VDSO := $(KBUILD_AFLAGS) -DBUILD_VDSO
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KBUILD_CFLAGS_VDSO := $(KBUILD_CFLAGS) -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
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KBUILD_CFLAGS_VDSO := $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_VDSO))
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KBUILD_CFLAGS_VDSO := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_VDSO))
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KBUILD_CFLAGS_VDSO := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_VDSO))
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KBUILD_CFLAGS_VDSO := $(filter-out -fno-asynchronous-unwind-tables,$(KBUILD_CFLAGS_VDSO))
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KBUILD_CFLAGS_VDSO += -fPIC -fno-common -fno-builtin -fasynchronous-unwind-tables
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KBUILD_CFLAGS_VDSO += -fno-stack-protector $(DISABLE_KSTACK_ERASE)
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ldflags-y := -shared -soname=linux-vdso.so.1 \
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--hash-style=both --build-id=sha1 -T
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$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_VDSO)
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$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_VDSO)
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obj-y += vdso_wrapper.o
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targets += vdso.lds
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CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
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# Force dependency (incbin is bad)
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$(obj)/vdso_wrapper.o : $(obj)/vdso.so
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quiet_cmd_vdso_and_check = VDSO $@
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cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)
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# link rule for the .so file, .lds has to be first
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$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) $(obj-cvdso) FORCE
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$(call if_changed,vdso_and_check)
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# strip rule for the .so file
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$(obj)/%.so: OBJCOPYFLAGS := -S
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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# assembly rules for the .S files
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$(obj-vdso): %.o: %.S FORCE
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$(call if_changed_dep,vdsoas)
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$(obj-cvdso): %.o: %.c FORCE
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$(call if_changed_dep,vdsocc)
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# actual build commands
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quiet_cmd_vdsoas = VDSOA $@
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cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
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quiet_cmd_vdsocc = VDSOC $@
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cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $<
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# Generate VDSO offsets using helper script
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gen-vdsosym := $(src)/gen_vdso_offsets.sh
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quiet_cmd_vdsosym = VDSOSYM $@
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
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$(call if_changed,vdsosym)
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