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| author | Vegard Nossum | 2016-08-02 23:07:30 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2016-08-03 01:35:43 +0200 |
| commit | a4691deabf284a601149a067525759939cc563b2 (patch) | |
| tree | 40524fe55bd55def7831a68e6a3d775b4a1ea3fd /scripts/Makefile.lib | |
| parent | init/Kconfig: add clarification for out-of-tree modules (diff) | |
| download | kernel-qcow2-linux-a4691deabf284a601149a067525759939cc563b2.tar.gz kernel-qcow2-linux-a4691deabf284a601149a067525759939cc563b2.tar.xz kernel-qcow2-linux-a4691deabf284a601149a067525759939cc563b2.zip | |
kcov: allow more fine-grained coverage instrumentation
For more targeted fuzzing, it's better to disable kernel-wide
instrumentation and instead enable it on a per-subsystem basis. This
follows the pattern of UBSAN and allows you to compile in the kcov
driver without instrumenting the whole kernel.
To instrument a part of the kernel, you can use either
# for a single file in the current directory
KCOV_INSTRUMENT_filename.o := y
or
# for all the files in the current directory (excluding subdirectories)
KCOV_INSTRUMENT := y
or
# (same as above)
ccflags-y += $(CFLAGS_KCOV)
or
# for all the files in the current directory (including subdirectories)
subdir-ccflags-y += $(CFLAGS_KCOV)
Link: http://lkml.kernel.org/r/1464008380-11405-1-git-send-email-vegard.nossum@oracle.com
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/Makefile.lib')
| -rw-r--r-- | scripts/Makefile.lib | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index e7df0f5db7ec..76494e15417b 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -138,7 +138,7 @@ endif ifeq ($(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 |