diff options
| author | Pengfei Xu <pengfei.xu@intel.com> | 2023-07-31 11:04:18 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-18 10:19:01 -0700 |
| commit | 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef (patch) | |
| tree | 9810e360ebb074022879191fe9a1f0c2e43e66fd /arch/x86/kernel/Makefile | |
| parent | 6b72e5f9e79360fce4f2be7fe81159fbdf4256a5 (diff) | |
| download | lwn-0d345996e4cb573f8cc81d49b3ee9a7fd2035bef.tar.gz lwn-0d345996e4cb573f8cc81d49b3ee9a7fd2035bef.zip | |
x86/kernel: increase kcov coverage under arch/x86/kernel folder
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
Link: https://lkml.kernel.org/r/06c0bb7b5f61e5884bf31180e8c122648c752010.1690771380.git.pengfei.xu@intel.com
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Pengfei Xu <pengfei.xu@intel.com>
Cc: Aleksandr Nogikh <nogikh@google.com>
Cc: <heng.su@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Kees Cook <keescook@google.com>,
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/x86/kernel/Makefile')
| -rw-r--r-- | arch/x86/kernel/Makefile | 9 |
1 files 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 |