mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
9c6b7fbbd7
After building with CONFIG_FORTIFY_SOURCE=y, many .*.d files are left
in lib/test_fortify/ because the compiler outputs header dependencies
into *.d without fixdep being invoked.
When compiling C files, if_changed_dep should be used so that the
auto-generated header dependencies are recorded in .*.cmd files.
Currently, if_changed is incorrectly used, and only two headers are
hard-coded in lib/Makefile.
In the previous patch version, the kbuild test robot detected new errors
on GCC 7.
GCC 7 or older does not produce test.d with the following test code:
$ echo 'void b(void) __attribute__((__error__(""))); void a(void) { b(); }' |
gcc -Wp,-MMD,test.d -c -o /dev/null -x c -
Perhaps, this was a bug that existed in older GCC versions.
Skip the tests for GCC<=7 for now, as this will be eventually solved
when we bump the minimal supported GCC version.
Link: https://lore.kernel.org/oe-kbuild-all/CAK7LNARmJcyyzL-jVJfBPi3W684LTDmuhMf1koF0TXoCpKTmcw@mail.gmail.com/T/#m13771bf78ae21adff22efc4d310c973fb4bcaf67
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20240727150302.1823750-4-masahiroy@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
29 lines
973 B
Makefile
29 lines
973 B
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
ccflags-y := $(call cc-disable-warning,fortify-source)
|
|
|
|
quiet_cmd_test_fortify = TEST $@
|
|
cmd_test_fortify = $(CONFIG_SHELL) $(src)/test_fortify.sh \
|
|
$< $@ "$(NM)" $(CC) $(c_flags) -DKBUILD_EXTRA_WARN1
|
|
|
|
$(obj)/%.log: $(src)/%.c $(src)/test_fortify.sh FORCE
|
|
$(call if_changed_dep,test_fortify)
|
|
|
|
logs = $(patsubst $(src)/%.c, %.log, $(wildcard $(src)/*-*.c))
|
|
targets += $(logs)
|
|
|
|
quiet_cmd_gen_fortify_log = CAT $@
|
|
cmd_gen_fortify_log = cat $(or $(real-prereqs),/dev/null) > $@
|
|
|
|
$(obj)/test_fortify.log: $(addprefix $(obj)/, $(logs)) FORCE
|
|
$(call if_changed,gen_fortify_log)
|
|
|
|
# GCC<=7 does not always produce *.d files.
|
|
# Run the tests only for GCC>=8 or Clang.
|
|
always-$(call gcc-min-version, 80000) += test_fortify.log
|
|
always-$(CONFIG_CC_IS_CLANG) += test_fortify.log
|
|
|
|
# Some architectures define __NO_FORTIFY if __SANITIZE_ADDRESS__ is undefined.
|
|
# Pass CFLAGS_KASAN to avoid warnings.
|
|
KASAN_SANITIZE := y
|