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authorDmitry Vyukov <dvyukov@google.com>2018-06-15 01:27:44 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-15 01:55:24 +0300
commit758517202bd2e427664857c9f2aa59da36848aca (patch)
tree550ace0c2101cf557526c0ac07c04dc2f938c7e1 /arch/arm/vdso
parent0ed557aa813922f6f32adec69e266532091c895b (diff)
downloadlinux-758517202bd2e427664857c9f2aa59da36848aca.tar.xz
arm: port KCOV to arm
KCOV is code coverage collection facility used, in particular, by syzkaller system call fuzzer. There is some interest in using syzkaller on arm devices. So port KCOV to arm. On implementation level this merely declares that KCOV is supported and disables instrumentation of 3 special cases. Reasons for disabling are commented in code. Tested with qemu-system-arm/vexpress-a15. Link: http://lkml.kernel.org/r/20180511143248.112484-1-dvyukov@google.com Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Abbott Liu <liuwenliang@huawei.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Koguchi Takuo <takuo.koguchi.sw@hitachi.com> Cc: <syzkaller@googlegroups.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/vdso')
-rw-r--r--arch/arm/vdso/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index bb4118213fee..f4efff9d3afb 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -30,6 +30,9 @@ CFLAGS_vgettimeofday.o = -O2
# Disable gcov profiling for VDSO code
GCOV_PROFILE := n
+# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
+KCOV_INSTRUMENT := n
+
# Force dependency
$(obj)/vdso.o : $(obj)/vdso.so