linux-hardening - [PATCH] bcachefs: Annotate struct bch_xattr with __counted

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Message-ID: <20240824135740.1971-2-thorsten.blum@toblux.com>
Date: Sat, 24 Aug 2024 15:57:41 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: kent.overstreet@...ux.dev,
	kees@...nel.org,
	gustavoars@...nel.org
Cc: linux-bcachefs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH] bcachefs: Annotate struct bch_xattr with __counted_by()

Add the __counted_by compiler attribute to the flexible array member
x_name to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
 fs/bcachefs/xattr_format.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/bcachefs/xattr_format.h b/fs/bcachefs/xattr_format.h
index e9f810539552..c7916011ef34 100644
--- a/fs/bcachefs/xattr_format.h
+++ b/fs/bcachefs/xattr_format.h
@@ -13,7 +13,7 @@ struct bch_xattr {
 	__u8			x_type;
 	__u8			x_name_len;
 	__le16			x_val_len;
-	__u8			x_name[];
+	__u8			x_name[] __counted_by(x_name_len);
 } __packed __aligned(8);
 
 #endif /* _BCACHEFS_XATTR_FORMAT_H */
-- 
2.46.0