[PATCH 1/2] kunit: support failure from dynamic analysis tools

[Uriel Guajardo]

Adds an API to allow dynamic analysis tools to fail the currently
running KUnit test case.

- Always places the kunit test in the task_struct to allow other tools
to access the currently running KUnit test.

- Creates a new header file to avoid circular dependencies that could be
created from the test.h file.

Requires KASAN-KUnit integration patch to access the kunit test from
task_struct:
https://lore.kernel.org/linux-kselftest/20200606040349.246780-2-davidgow@xxxxxxxxxx/

Signed-off-by: Uriel Guajardo <urielguajardo@xxxxxxxxxx>
---
 include/kunit/test-bug.h | 24 ++++++++++++++++++++++++
 include/kunit/test.h     |  1 +
 lib/kunit/test.c         | 10 ++++++----
 3 files changed, 31 insertions(+), 4 deletions(-)
 create mode 100644 include/kunit/test-bug.h

diff --git a/include/kunit/test-bug.h b/include/kunit/test-bug.h
new file mode 100644
index 000000000000..283c19ec328f
--- /dev/null
+++ b/include/kunit/test-bug.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KUnit API allowing dynamic analysis tools to interact with KUnit tests
+ *
+ * Copyright (C) 2020, Google LLC.
+ * Author: Uriel Guajardo <urielguajardo@xxxxxxxxxx>
+ */
+
+#ifndef _KUNIT_TEST_BUG_H
+#define _KUNIT_TEST_BUG_H
+
+#if IS_ENABLED(CONFIG_KUNIT)
+
+extern void kunit_fail_current_test(void);
+
+#else
+
+static inline void kunit_fail_current_test(void)
+{
+}
+
+#endif
+
+#endif /* _KUNIT_TEST_BUG_H */
diff --git a/include/kunit/test.h b/include/kunit/test.h
index 3391f38389f8..81bf43a1abda 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -11,6 +11,7 @@
 
 #include <kunit/assert.h>
 #include <kunit/try-catch.h>
+#include <kunit/test-bug.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index dcc35fd30d95..d8189d827368 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -16,6 +16,12 @@
 #include "string-stream.h"
 #include "try-catch-impl.h"
 
+void kunit_fail_current_test(void)
+{
+	if (current->kunit_test)
+		kunit_set_failure(current->kunit_test);
+}
+
 static void kunit_print_tap_version(void)
 {
 	static bool kunit_has_printed_tap_version;
@@ -284,9 +290,7 @@ static void kunit_try_run_case(void *data)
 	struct kunit_suite *suite = ctx->suite;
 	struct kunit_case *test_case = ctx->test_case;
 
-#if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))
 	current->kunit_test = test;
-#endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT) */
 
 	/*
 	 * kunit_run_case_internal may encounter a fatal error; if it does,
@@ -602,9 +606,7 @@ void kunit_cleanup(struct kunit *test)
 		spin_unlock(&test->lock);
 		kunit_remove_resource(test, res);
 	}
-#if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))
 	current->kunit_test = NULL;
-#endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT)*/
 }
 EXPORT_SYMBOL_GPL(kunit_cleanup);
 
-- 
2.28.0.163.g6104cc2f0b6-goog