linux-kernel - [PATCH] ecryptfs: Annotate struct ecryptfs_message with __counted

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Message-ID: <20260112115314.739612-2-thorsten.blum@linux.dev>
Date: Mon, 12 Jan 2026 12:53:11 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Tyler Hicks <code@...icks.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eric Biggers <ebiggers@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	ecryptfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] ecryptfs: Annotate struct ecryptfs_message 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>
---
 fs/ecryptfs/ecryptfs_kernel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 62a2ea7f59ed..f58b12be8267 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -359,7 +359,7 @@ struct ecryptfs_message {
 	/* Inherits from msg_ctx->index */
 	u32 index;
 	u32 data_len;
-	u8 data[];
+	u8 data[] __counted_by(data_len);
 };
 
 struct ecryptfs_msg_ctx {
-- 
Thorsten Blum <thorsten.blum@...ux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4