linux-kernel - [PATCH v2] crypto: chacha20poly1305 - Annotate struct chachapoly_ctx with __counted

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Message-ID: <20240805221129.2644-2-thorsten.blum@toblux.com>
Date: Tue,  6 Aug 2024 00:11:30 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: herbert@...dor.apana.org.au,
	davem@...emloft.net,
	kees@...nel.org,
	gustavoars@...nel.org
Cc: linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH v2] crypto: chacha20poly1305 - Annotate struct chachapoly_ctx with __counted_by()

Add the __counted_by compiler attribute to the flexible array member
salt to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Reviewed-by: Kees Cook <kees@...nel.org>
Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
Changes in v2:
- Drop using struct_size_t() as suggested by Eric Biggers and Kees Cook
- Link to v1: https://lore.kernel.org/linux-kernel/20240805175237.63098-2-thorsten.blum@toblux.com/
---
 crypto/chacha20poly1305.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c
index 9e4651330852..d740849f1c19 100644
--- a/crypto/chacha20poly1305.c
+++ b/crypto/chacha20poly1305.c
@@ -27,7 +27,7 @@ struct chachapoly_ctx {
 	struct crypto_ahash *poly;
 	/* key bytes we use for the ChaCha20 IV */
 	unsigned int saltlen;
-	u8 salt[];
+	u8 salt[] __counted_by(saltlen);
 };
 
 struct poly_req {
-- 
2.45.2