linux-kernel - [PATCH] crypto: af_alg - Annotate struct af_alg_iv with __counted

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Message-ID: <20251114000155.163287-1-thorsten.blum@linux.dev>
Date: Fri, 14 Nov 2025 01:01:54 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: 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>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] crypto: af_alg - Annotate struct af_alg_iv with __counted_by

Add the __counted_by() compiler attribute to the flexible array member
'iv' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 include/uapi/linux/if_alg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_alg.h b/include/uapi/linux/if_alg.h
index b35871cbeed7..4f51e198ac2e 100644
--- a/include/uapi/linux/if_alg.h
+++ b/include/uapi/linux/if_alg.h
@@ -42,7 +42,7 @@ struct sockaddr_alg_new {
 
 struct af_alg_iv {
 	__u32	ivlen;
-	__u8	iv[];
+	__u8	iv[] __counted_by(ivlen);
 };
 
 /* Socket options */
-- 
2.51.1