linux-kernel - [PATCH 3/4] selftests/lkdtm: Reset WARN

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Message-Id: <20200529200347.2464284-4-keescook@chromium.org>
Date:   Fri, 29 May 2020 13:03:46 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        linux-kselftest@...r.kernel.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] selftests/lkdtm: Reset WARN_ONCE to avoid false negatives

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@...omium.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