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Subject[PATCH 3/4] selftests/lkdtm: Reset WARN_ONCE to avoid false negatives
Date
Since we expect to see warnings every time for many tests, just reset
the WARN_ONCE flags each time the script runs.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
tools/testing/selftests/lkdtm/run.sh | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/lkdtm/run.sh b/tools/testing/selftests/lkdtm/run.sh
index ee64ff8df8f4..8383eb89d88a 100755
--- a/tools/testing/selftests/lkdtm/run.sh
+++ b/tools/testing/selftests/lkdtm/run.sh
@@ -8,6 +8,7 @@
#
set -e
TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT
+CLEAR_ONCE=/sys/kernel/debug/clear_warn_once
KSELFTEST_SKIP_TEST=4

# Verify we have LKDTM available in the kernel.
@@ -67,6 +68,11 @@ cleanup() {
}
trap cleanup EXIT

+# Reset WARN_ONCE counters so we trip it each time this runs.
+if [ -w $CLEAR_ONCE ] ; then
+ echo 1 > $CLEAR_ONCE
+fi
+
# Save existing dmesg so we can detect new content below
dmesg > "$DMESG"

--
2.25.1
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