linux-kernel - [PATCH 4/6] lib/crypto: poly1305: Add at_least decoration to fixed-size array params

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Message-ID: <20251122194206.31822-5-ebiggers@kernel.org>
Date: Sat, 22 Nov 2025 11:42:04 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	"Jason A . Donenfeld" <Jason@...c4.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-hardening@...r.kernel.org,
	Kees Cook <kees@...nel.org>,
	Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH 4/6] lib/crypto: poly1305: Add at_least decoration to fixed-size array params

Add the at_least (i.e. 'static') decoration to the fixed-size array
parameters of the poly1305 library functions.  This causes clang to warn
when a too-small array of known size is passed.

Signed-off-by: Eric Biggers <ebiggers@...nel.org>
---
 include/crypto/poly1305.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/crypto/poly1305.h b/include/crypto/poly1305.h
index d4daeec8da19..190beb427c6d 100644
--- a/include/crypto/poly1305.h
+++ b/include/crypto/poly1305.h
@@ -57,11 +57,11 @@ struct poly1305_desc_ctx {
 	u32 s[4];
 	struct poly1305_block_state state;
 };
 
 void poly1305_init(struct poly1305_desc_ctx *desc,
-		   const u8 key[POLY1305_KEY_SIZE]);
+		   const u8 key[at_least POLY1305_KEY_SIZE]);
 void poly1305_update(struct poly1305_desc_ctx *desc,
 		     const u8 *src, unsigned int nbytes);
 void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest);
 
 #endif
-- 
2.51.2