+ kunit-taint-the-kernel-when-kunit-tests-are-run.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: kunit: taint the kernel when KUnit tests are run
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     kunit-taint-the-kernel-when-kunit-tests-are-run.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kunit-taint-the-kernel-when-kunit-tests-are-run.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: David Gow <davidgow@google.com>
Subject: kunit: taint the kernel when KUnit tests are run
Date: Sat, 2 Jul 2022 12:09:58 +0800

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).

Link: https://lkml.kernel.org/r/20220702040959.3232874-3-davidgow@google.com
Signed-off-by: David Gow <davidgow@google.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Tested-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guilherme G. Piccoli <gpiccoli@igalia.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/kunit/test.h |    3 ++-
 lib/kunit/test.c     |    4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

--- a/include/kunit/test.h~kunit-taint-the-kernel-when-kunit-tests-are-run
+++ a/include/kunit/test.h
@@ -277,7 +277,8 @@ static inline int kunit_run_all_tests(vo
 	{								\
 		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 */
--- a/lib/kunit/test.c~kunit-taint-the-kernel-when-kunit-tests-are-run
+++ a/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 *
 	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) {
_

Patches currently in -mm which might be from davidgow@google.com are

panic-taint-kernel-if-tests-are-run.patch
module-panic-taint-the-kernel-when-selftest-modules-load.patch
kunit-taint-the-kernel-when-kunit-tests-are-run.patch
selftest-taint-kernel-when-test-module-loaded.patch