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-rw-r--r--lib/Kconfig.debug11
-rw-r--r--scripts/Makefile.lib2
2 files changed, 12 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f07842e2d69f..cc02f282d05b 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -719,6 +719,17 @@ config KCOV
For more details, see Documentation/kcov.txt.
+config KCOV_INSTRUMENT_ALL
+ bool "Instrument all code by default"
+ depends on KCOV
+ default y if KCOV
+ help
+ If you are doing generic system call fuzzing (like e.g. syzkaller),
+ then you will want to instrument the whole kernel and you should
+ say y here. If you are doing more targeted fuzzing (like e.g.
+ filesystem fuzzing with AFL) then you will want to enable coverage
+ for more specific subsets of files, and should say n here.
+
config DEBUG_SHIRQ
bool "Debug shared IRQ handlers"
depends on DEBUG_KERNEL
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index e7df0f5db7ec..76494e15417b 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -138,7 +138,7 @@ endif
ifeq ($(CONFIG_KCOV),y)
_c_flags += $(if $(patsubst n%,, \
- $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)y), \
+ $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
$(CFLAGS_KCOV))
endif