7f7f6f7ad6
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>
1.6 KiB
SPDX-License-Identifier: GPL-2.0
Building vDSO images for x86.
VDSO64-y := y
vdso-install-$(VDSO64-y) += vdso.so
files to link into the vdso
vobjs-y := vdso-note.o um_vdso.o
files to link into kernel
obj-$(VDSO64-y) += vdso.o vma.o
vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
$(obj)/vdso.o: $(obj)/vdso.so
targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
CPPFLAGS_vdso.lds += -P -C
VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1
-Wl,-z,max-page-size=4096
$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE $(call if_changed,vdso)
$(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy)
Don't omit frame pointers for ease of userspace debugging, but do
optimize sibling calls.
CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64
$(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector
-fno-omit-frame-pointer -foptimize-sibling-calls
$(vobjs): KBUILD_CFLAGS += $(CFL)
vDSO code runs in userspace and -pg doesn't help with profiling anyway.
CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
The DSO images are built using a special linker script.
quiet_cmd_vdso = VDSO $@
cmd_vdso = $(CC) -nostdlib -o $@
$(CC_FLAGS_LTO) $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F)))
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) &&
sh $(src)/checkundef.sh '$(NM)' '$@'
VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack