linux-kernel - [PATCH] iio: magnetometer: ak8974: Add __nonstring annotations for unterminated strings

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Message-Id: <20250310222346.work.810-kees@kernel.org>
Date: Mon, 10 Mar 2025 15:23:47 -0700
From: Kees Cook <kees@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Kees Cook <kees@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] iio: magnetometer: ak8974: Add __nonstring annotations for unterminated strings

When a character array without a terminating NUL character has a static
initializer, GCC 15's -Wunterminated-string-initialization will only
warn if the array lacks the "nonstring" attribute[1]. Mark the arrays
with __nonstring to and correctly identify the char array as "not a C
string" and thereby eliminate the warning.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117178 [1]
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Jonathan Cameron <jic23@...nel.org>
Cc: Lars-Peter Clausen <lars@...afoo.de>
Cc: linux-iio@...r.kernel.org
Signed-off-by: Kees Cook <kees@...nel.org>
---
 drivers/iio/magnetometer/ak8974.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c
index 08975c60e325..44d8428a69b0 100644
--- a/drivers/iio/magnetometer/ak8974.c
+++ b/drivers/iio/magnetometer/ak8974.c
@@ -535,8 +535,8 @@ static int ak8974_detect(struct ak8974 *ak8974)
 				       fab_data2, sizeof(fab_data2));
 
 		for (i = 0; i < 3; ++i) {
-			static const char axis[3] = "XYZ";
-			static const char pgaxis[6] = "ZYZXYX";
+			static const char axis[3] __nonstring = "XYZ";
+			static const char pgaxis[6] __nonstring = "ZYZXYX";
 			unsigned offz = le16_to_cpu(fab_data2[i]) & 0x7F;
 			unsigned fine = le16_to_cpu(fab_data1[i]);
 			unsigned sens = le16_to_cpu(fab_data1[i + 3]);
-- 
2.34.1