selftest/firmware: Add selftest timeout in settings

The firmware tests would always time out for me. Add a correct timeout,
including details on how the value was reached. Additionally allow the
test harness to skip comments in settings files and report how long a
given timeout was.

Reviewed-by: SeongJae Park <sjpark@amazon.de>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20200724213640.389191-3-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/testing/selftests/firmware/settings

@@ -0,0 +1,8 @@
+# The async firmware timeout is set to 1 second (but ends up being effectively
+# 2 seconds). There are 3 test configs, each done with and without firmware
+# present, each with 2 "nowait" functions tested 5 times. Expected time for a
+# normal execution should be 2 * 3 * 2 * 2 * 5 = 120 seconds for those alone.
+# Additionally, fw_fallback may take 5 seconds for internal timeouts in each
+# of the 3 configs, so at least another 15 seconds are needed. Add another
+# 10 seconds for each testing config: 120 + 15 + 30
+timeout=165

tools/testing/selftests/kselftest/runner.sh

@@ -53,6 +53,10 @@ run_one()
 	settings="$BASE_DIR/$DIR/settings"
 	if [ -r "$settings" ] ; then
 		while read line ; do
+			# Skip comments.
+			if echo "$line" | grep -q '^#'; then
+				continue
+			fi
 			field=$(echo "$line" | cut -d= -f1)
 			value=$(echo "$line" | cut -d= -f2-)
 			eval "kselftest_$field"="$value"
@@ -80,7 +84,7 @@ run_one()
 			echo "not ok $test_num $TEST_HDR_MSG # SKIP"
 		elif [ $rc -eq $timeout_rc ]; then \
 			echo "#"
-			echo "not ok $test_num $TEST_HDR_MSG # TIMEOUT"
+			echo "not ok $test_num $TEST_HDR_MSG # TIMEOUT $kselftest_timeout seconds"
 		else
 			echo "not ok $test_num $TEST_HDR_MSG # exit=$rc"
 		fi)