linux-kernel - [PATCH] wireguard: noise: Add __nonstring annotations for unterminated strings

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Message-Id: <20250310222249.work.154-kees@kernel.org>
Date: Mon, 10 Mar 2025 15:22:50 -0700
From: Kees Cook <kees@...nel.org>
To: "Jason A . Donenfeld" <Jason@...c4.com>
Cc: Kees Cook <kees@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	wireguard@...ts.zx2c4.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] wireguard: noise: 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: Jason A. Donenfeld <Jason@...c4.com>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: wireguard@...ts.zx2c4.com
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <kees@...nel.org>
---
 drivers/net/wireguard/noise.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/noise.c b/drivers/net/wireguard/noise.c
index 202a33af5a72..7eb9a23a3d4d 100644
--- a/drivers/net/wireguard/noise.c
+++ b/drivers/net/wireguard/noise.c
@@ -25,8 +25,8 @@
  * <- e, ee, se, psk, {}
  */
 
-static const u8 handshake_name[37] = "Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s";
-static const u8 identifier_name[34] = "WireGuard v1 zx2c4 Jason@...c4.com";
+static const u8 handshake_name[37] __nonstring = "Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s";
+static const u8 identifier_name[34] __nonstring = "WireGuard v1 zx2c4 Jason@...c4.com";
 static u8 handshake_init_hash[NOISE_HASH_LEN] __ro_after_init;
 static u8 handshake_init_chaining_key[NOISE_HASH_LEN] __ro_after_init;
 static atomic64_t keypair_counter = ATOMIC64_INIT(0);
-- 
2.34.1