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Masahiro Yamada 7f7f6f7ad6 Makefile: remove redundant tool coverage variables

Now Kbuild provides reasonable defaults for objtool, sanitizers, and
profilers.

Remove redundant variables.

Note:

This commit changes the coverage for some objects:

  - include arch/mips/vdso/vdso-image.o into UBSAN, GCOV, KCOV
  - include arch/sparc/vdso/vdso-image-*.o into UBSAN
  - include arch/sparc/vdso/vma.o into UBSAN
  - include arch/x86/entry/vdso/extable.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso-image-*.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso32-setup.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vma.o into GCOV, KCOV
  - include arch/x86/um/vdso/vma.o into KASAN, GCOV, KCOV

I believe these are positive effects because all of them are kernel
space objects.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Roberto Sassu <roberto.sassu@huawei.com>

2024-05-14 23:35:48 +09:00

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SPDX-License-Identifier: GPL-2.0

List of files in the vdso

Include the generic Makefile to check the built vdso.

include $(srctree)/lib/vdso/Makefile obj-vdso64 = vdso_user_wrapper.o note.o obj-cvdso64 = vdso64_generic.o getcpu.o VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE)

Build rules

targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64))

KBUILD_AFLAGS += -DBUILD_VDSO KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING

KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS)) KBUILD_AFLAGS_64 += -m64

KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS)) KBUILD_CFLAGS_64 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_64)) KBUILD_CFLAGS_64 := $(filter-out -munaligned-symbols,$(KBUILD_CFLAGS_64)) KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin ldflags-y := -shared -soname=linux-vdso64.so.1
--hash-style=both --build-id=sha1 -T

$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64) $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)

obj-y += vdso64_wrapper.o targets += vdso64.lds CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)

Force dependency (incbin is bad)

$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so

quiet_cmd_vdso_and_check = VDSO $@ cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)

link rule for the .so file, .lds has to be first

$(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE $(call if_changed,vdso_and_check)

strip rule for the .so file

$(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy)

assembly rules for the .S files

$(obj-vdso64): %.o: %.S FORCE $(call if_changed_dep,vdso64as)

$(obj-cvdso64): %.o: %.c FORCE $(call if_changed_dep,vdso64cc)

actual build commands

quiet_cmd_vdso64as = VDSO64A $@ cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $< quiet_cmd_vdso64cc = VDSO64C $@ cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $<

Generate VDSO offsets using helper script

gen-vdsosym := $(src)/gen_vdso_offsets.sh quiet_cmd_vdsosym = VDSOSYM $@ cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@

include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE $(call if_changed,vdsosym)

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