linux-hardening - [PATCH v2 2/3] drm/tests: Use KUNIT_DEFINE_ACTION

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Date: Tue, 28 Nov 2023 15:24:06 +0800
From: David Gow <davidgow@...gle.com>
To: Nathan Chancellor <nathan@...nel.org>, Kees Cook <keescook@...omium.org>, 
	Brendan Higgins <brendan.higgins@...ux.dev>, Rae Moar <rmoar@...gle.com>, dlatypov@...gle.com
Cc: David Gow <davidgow@...gle.com>, Benjamin Berg <benjamin.berg@...el.com>, 
	Maxime Ripard <mripard@...nel.org>, Richard Fitzgerald <rf@...nsource.cirrus.com>, llvm@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-kselftest@...r.kernel.org, linux-hardening@...r.kernel.org, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>
Subject: [PATCH v2 2/3] drm/tests: Use KUNIT_DEFINE_ACTION_WRAPPER()

In order to pass functions to kunit_add_action(), they need to be of the
kunit_action_t type. While casting the function pointer can work, it
will break control-flow integrity.

drm_kunit_helpers already defines wrappers, but we now have a macro
which does this automatically. Using this greatly reduces the
boilerplate needed.

Acked-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: David Gow <davidgow@...gle.com>
---

No changes since v1:
https://lore.kernel.org/linux-kselftest/20231110200830.1832556-2-davidgow@google.com/

---
 drivers/gpu/drm/tests/drm_kunit_helpers.c | 30 +++++++----------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index bccb33b900f3..c251e6b34de0 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -27,27 +27,15 @@ static struct platform_driver fake_platform_driver = {
 	},
 };
 
-static void kunit_action_platform_driver_unregister(void *ptr)
-{
-	struct platform_driver *drv = ptr;
-
-	platform_driver_unregister(drv);
-
-}
-
-static void kunit_action_platform_device_put(void *ptr)
-{
-	struct platform_device *pdev = ptr;
-
-	platform_device_put(pdev);
-}
-
-static void kunit_action_platform_device_del(void *ptr)
-{
-	struct platform_device *pdev = ptr;
-
-	platform_device_del(pdev);
-}
+KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_driver_unregister,
+			    platform_driver_unregister,
+			    struct platform_driver *);
+KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_put,
+			    platform_device_put,
+			    struct platform_device *);
+KUNIT_DEFINE_ACTION_WRAPPER(kunit_action_platform_device_del,
+			    platform_device_del,
+			    struct platform_device *);
 
 /**
  * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
-- 
2.43.0.rc1.413.gea7ed67945-goog