mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
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 += $(CFLAGS_KCOV) Link: http://lkml.kernel.org/r/1464008380-11405-1-git-send-email-vegard.nossum@oracle.com Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
f1cb637e75
commit
a4691deabf
@ -719,6 +719,17 @@ config KCOV
|
||||
|
||||
For more details, see Documentation/kcov.txt.
|
||||
|
||||
config KCOV_INSTRUMENT_ALL
|
||||
bool "Instrument all code by default"
|
||||
depends on KCOV
|
||||
default y if KCOV
|
||||
help
|
||||
If you are doing generic system call fuzzing (like e.g. syzkaller),
|
||||
then you will want to instrument the whole kernel and you should
|
||||
say y here. If you are doing more targeted fuzzing (like e.g.
|
||||
filesystem fuzzing with AFL) then you will want to enable coverage
|
||||
for more specific subsets of files, and should say n here.
|
||||
|
||||
config DEBUG_SHIRQ
|
||||
bool "Debug shared IRQ handlers"
|
||||
depends on DEBUG_KERNEL
|
||||
|
@ -138,7 +138,7 @@ endif
|
||||
|
||||
ifeq ($(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
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user