linux-kernel - [PATCH] ovl: Annotate struct ovl_entry with __counted

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Message-ID: <20250503132537.343082-1-thorsten.blum@linux.dev>
Date: Sat,  3 May 2025 15:25:36 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Miklos Szeredi <miklos@...redi.hu>,
	Amir Goldstein <amir73il@...il.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-unionfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] ovl: Annotate struct ovl_entry with __counted_by()

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

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

diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index cb449ab310a7..afb7762f873f 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -51,7 +51,7 @@ struct ovl_path {
 
 struct ovl_entry {
 	unsigned int __numlower;
-	struct ovl_path __lowerstack[];
+	struct ovl_path __lowerstack[] __counted_by(__numlower);
 };
 
 /* private information held for overlayfs's superblock */
-- 
2.49.0