linux-kernel - [PATCH v2] wifi: virt_wifi: Add __nonstring annotations for unterminated strings

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Message-Id: <20250311225604.it.926-kees@kernel.org>
Date: Tue, 11 Mar 2025 15:56:05 -0700
From: Kees Cook <kees@...nel.org>
To: Johannes Berg <johannes@...solutions.net>
Cc: Kees Cook <kees@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	En-Wei Wu <en-wei.wu@...onical.com>,
	Kalle Valo <kvalo@...nel.org>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH v2] wifi: virt_wifi: 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]
Signed-off-by: Kees Cook <kees@...nel.org>
---
 v1: https://lore.kernel.org/lkml/20250310222318.work.395-kees@kernel.org/
 v2: correctly split and fix subject
Cc: Johannes Berg <johannes@...solutions.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: En-Wei Wu <en-wei.wu@...onical.com>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org
---
 drivers/net/wireless/virtual/virt_wifi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/virtual/virt_wifi.c b/drivers/net/wireless/virtual/virt_wifi.c
index 4ee374080466..fc122b79301a 100644
--- a/drivers/net/wireless/virtual/virt_wifi.c
+++ b/drivers/net/wireless/virtual/virt_wifi.c
@@ -146,7 +146,7 @@ static void virt_wifi_inform_bss(struct wiphy *wiphy)
 	static const struct {
 		u8 tag;
 		u8 len;
-		u8 ssid[8];
+		u8 ssid[8] __nonstring;
 	} __packed ssid = {
 		.tag = WLAN_EID_SSID,
 		.len = VIRT_WIFI_SSID_LEN,
-- 
2.34.1