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Makefile: support flag -fsanitizer-coverage=trace-cmp

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The flag enables Clang instrumentation of comparison operations
(currently not supported by GCC).  This instrumentation is needed by the
new KCOV device to collect comparison operands.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Victor Chibotaru <[email protected]>
Signed-off-by: Alexander Potapenko <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Alexander Popov <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Vegard Nossum <[email protected]>
Cc: Quentin Casasnovas <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Victor Chibotaru authored and Linus Torvalds committed 2017-11-17 16:10:04 -08:00
1 parent ded97d2c2b
commit d677a4d601
3 files changed
+18 -2
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Makefile
+1 -2
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@@ -375,8 +375,6 @@ CFLAGS_KERNEL =
AFLAGS_KERNEL =
LDFLAGS_vmlinux =
CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE := \
@@ -659,6 +657,7 @@ ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLA
KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
endif
include scripts/Makefile.kcov
include scripts/Makefile.gcc-plugins
ifdef CONFIG_READABLE_ASM
lib/Kconfig.debug
+10
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@@ -756,6 +756,16 @@ config KCOV
For more details, see Documentation/dev-tools/kcov.rst.
config KCOV_ENABLE_COMPARISONS
bool "Enable comparison operands collection by KCOV"
depends on KCOV
default n
help
KCOV also exposes operands of every comparison in the instrumented
code along with operand sizes and PCs of the comparison instructions.
These operands can be used by fuzzing engines to improve the quality
of fuzzing coverage.
config KCOV_INSTRUMENT_ALL
bool "Instrument all code by default"
depends on KCOV
scripts/Makefile.kcov
+7
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@@ -0,0 +1,7 @@
ifdef CONFIG_KCOV
CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
ifeq ($(CONFIG_KCOV_ENABLE_COMPARISONS),y)
CFLAGS_KCOV += $(call cc-option,-fsanitize-coverage=trace-cmp,)
endif
endif