linux-hardening - [PATCH v2 2/2][next] kunit/overflow: Add tests for STACK_FLEX_ARRAY

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Message-ID: <c127631a03cdd7f59bfa091b9666a93bf69d0322.1745355442.git.gustavoars@kernel.org>
Date: Tue, 22 Apr 2025 15:07:41 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2][next] kunit/overflow: Add tests for
 STACK_FLEX_ARRAY_SIZE() helper

Add a couple of tests for new STACK_FLEX_ARRAY_SIZE() helper.

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes v2:
 - Add 0 test for `empty` instance.

v1:
 - Link: https://lore.kernel.org/linux-hardening/8cf48c3f9d8ef9b999d87cc0a822ffe539bf7a64.1745342381.git.gustavoars@kernel.org/

 lib/tests/overflow_kunit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/tests/overflow_kunit.c b/lib/tests/overflow_kunit.c
index 894691b4411a..19cb03b25dc5 100644
--- a/lib/tests/overflow_kunit.c
+++ b/lib/tests/overflow_kunit.c
@@ -1210,6 +1210,10 @@ static void DEFINE_FLEX_test(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, __struct_size(empty->array), 0);
 	KUNIT_EXPECT_EQ(test, __member_size(empty->array), 0);
 
+	KUNIT_EXPECT_EQ(test, STACK_FLEX_ARRAY_SIZE(two, array), 2);
+	KUNIT_EXPECT_EQ(test, STACK_FLEX_ARRAY_SIZE(eight, array), 8);
+	KUNIT_EXPECT_EQ(test, STACK_FLEX_ARRAY_SIZE(empty, array), 0);
+
 	/* If __counted_by is not being used, array size will have the on-stack size. */
 	if (!IS_ENABLED(CONFIG_CC_HAS_COUNTED_BY))
 		array_size_override = 2 * sizeof(s16);
-- 
2.43.0