Messages in this thread Patch in this message | | | From | Pengfei Xu <> | Subject | [PATCH v1 1/1] x86/kernel: Increase kcov coverage under arch/x86/kernel folder | Date | Tue, 4 Jul 2023 17:00:41 +0800 |
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Currently kcov instrument is disabled for object files under arch/x86/kernel folder. For object files under arch/x86/kernel, actually just disabling the kcov instrument of files:"head32.o or head64.o and sev.o" could achieve successful booting and provide kcov coverage for object files that do not disable kcov instrument. The additional kcov coverage collected from arch/x86/kernel folder helps kernel fuzzing efforts to find bugs.
Link to related improvement discussion is below: https://groups.google.com/g/syzkaller/c/Dsl-RYGCqs8/m/x-tfpTyFBAAJ Related ticket is as follow: https://bugzilla.kernel.org/show_bug.cgi?id=198443
Signed-off-by: Pengfei Xu <pengfei.xu@intel.com> --- arch/x86/kernel/Makefile | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 4070a01c11b7..00df34c263cc 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -33,11 +33,10 @@ KCSAN_SANITIZE := n KMSAN_SANITIZE_head$(BITS).o := n KMSAN_SANITIZE_nmi.o := n -# If instrumentation of this dir is enabled, boot hangs during first second. -# Probably could be more selective here, but note that files related to irqs, -# boot, dumpstack/stacktrace, etc are either non-interesting or can lead to -# non-deterministic coverage. -KCOV_INSTRUMENT := n +# If instrumentation of the following files is enabled, boot hangs during +# first second. +KCOV_INSTRUMENT_head$(BITS).o := n +KCOV_INSTRUMENT_sev.o := n CFLAGS_irq.o := -I $(srctree)/$(src)/../include/asm/trace -- 2.31.1
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