linux-kernel - [PATCH v2] kasan: disable kasan_strings() kunit test when CONFIG_FORTIFY

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Message-Id: <20250801092805.2602490-1-yeoreum.yun@arm.com>
Date: Fri,  1 Aug 2025 10:28:05 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: thomas.weissschuh@...utronix.de,
	ryabinin.a.a@...il.com,
	glider@...gle.com,
	andreyknvl@...il.com,
	dvyukov@...gle.com,
	vincenzo.frascino@....com,
	akpm@...ux-foundation.org
Cc: kasan-dev@...glegroups.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v2] kasan: disable kasan_strings() kunit test when CONFIG_FORTIFY_SOURCE enabled

When CONFIG_FORTIFY_SOURCE is enabled, invalid access from source
triggers __fortify_panic() which kills running task.

This makes failured of kasan_strings() kunit testcase since the
kunit-try-cacth kthread running kasan_string() dies before checking the
fault.

To address this, add define for __NO_FORTIFY for kasan kunit test.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 mm/kasan/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/kasan/Makefile b/mm/kasan/Makefile
index dd93ae8a6beb..b70d76c167ca 100644
--- a/mm/kasan/Makefile
+++ b/mm/kasan/Makefile
@@ -44,6 +44,10 @@ ifndef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
 CFLAGS_KASAN_TEST += -fno-builtin
 endif

+ifdef CONFIG_FORTIFY_SOURCE
+CFLAGS_KASAN_TEST += -D__NO_FORTIFY
+endif
+
 CFLAGS_REMOVE_kasan_test_c.o += $(call cc-option, -Wvla-larger-than=1)
 CFLAGS_kasan_test_c.o := $(CFLAGS_KASAN_TEST)
 RUSTFLAGS_kasan_test_rust.o := $(RUSTFLAGS_KASAN)
--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}