[v5,3/4] kunit: Taint the kernel when KUnit tests are run

Commit Message

David Gow July 2, 2022, 4:09 a.m. UTC

Make KUnit trigger the new TAINT_TEST taint when any KUnit test is run.
Due to KUnit tests not being intended to run on production systems, and
potentially causing problems (or security issues like leaking kernel
addresses), the kernel's state should not be considered safe for
production use after KUnit tests are run.

This both marks KUnit modules as test modules using MODULE_INFO() and
manually taints the kernel when tests are run (which catches builtin
tests).

Acked-by: Luis Chamberlain <[e-mail]>
Tested-by: Daniel Latypov <[e-mail]>
Reviewed-by: Brendan Higgins <[e-mail]>
Signed-off-by: David Gow <[e-mail]>
---
 include/kunit/test.h | 3 ++-
 lib/kunit/test.c     | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

Patch

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 8ffcd7de9607..ccae848720dc 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -277,7 +277,8 @@  static inline int kunit_run_all_tests(void)
 	{								\
 		return __kunit_test_suites_exit(__suites);		\
 	}								\
-	module_exit(kunit_test_suites_exit)
+	module_exit(kunit_test_suites_exit)				\
+	MODULE_INFO(test, "Y");
 #else
 #define kunit_test_suites_for_module(__suites)
 #endif /* MODULE */
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index a5053a07409f..8b11552dc215 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -11,6 +11,7 @@ 
 #include <kunit/test-bug.h>
 #include <linux/kernel.h>
 #include <linux/moduleparam.h>
+#include <linux/panic.h>
 #include <linux/sched/debug.h>
 #include <linux/sched.h>
 
@@ -501,6 +502,9 @@  int kunit_run_tests(struct kunit_suite *suite)
 	struct kunit_result_stats suite_stats = { 0 };
 	struct kunit_result_stats total_stats = { 0 };
 
+	/* Taint the kernel so we know we've run tests. */
+	add_taint(TAINT_TEST, LOCKDEP_STILL_OK);
+
 	if (suite->suite_init) {
 		suite->suite_init_err = suite->suite_init(suite);
 		if (suite->suite_init_err) {