linux-kernel - [PATCH] keys: Annotate struct asymmetric_key_id with __counted

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Message-ID: <20251023174810.75805-2-thorsten.blum@linux.dev>
Date: Thu, 23 Oct 2025 19:48:11 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: David Howells <dhowells@...hat.com>,
	Lukas Wunner <lukas@...ner.de>,
	Ignat Korchagin <ignat@...udflare.com>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	keyrings@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] keys: Annotate struct asymmetric_key_id with __counted_by

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

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

diff --git a/include/keys/asymmetric-type.h b/include/keys/asymmetric-type.h
index 69a13e1e5b2e..1b91c8f98688 100644
--- a/include/keys/asymmetric-type.h
+++ b/include/keys/asymmetric-type.h
@@ -49,7 +49,7 @@ enum asymmetric_payload_bits {
  */
 struct asymmetric_key_id {
 	unsigned short	len;
-	unsigned char	data[];
+	unsigned char	data[] __counted_by(len);
 };
 
 struct asymmetric_key_ids {
-- 
2.51.0