linux-kernel - [PATCH] fs/xattr: Annotate struct simple_xattr with __counted

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Message-ID: <20251109132356.473873-1-thorsten.blum@linux.dev>
Date: Sun,  9 Nov 2025 14:23:51 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] fs/xattr: Annotate struct simple_xattr with __counted_by

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

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

diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 86b0d47984a1..2d0ccf99ee75 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -114,7 +114,7 @@ struct simple_xattr {
 	struct rb_node rb_node;
 	char *name;
 	size_t size;
-	char value[];
+	char value[] __counted_by(size);
 };
 
 void simple_xattrs_init(struct simple_xattrs *xattrs);
-- 
2.51.1