linux-hardening - [PATCH] bcachefs: Add a comment to clarify the removal of __counted

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Message-ID: <20250501185108.203158-1-mmpgouride@gmail.com>
Date: Fri,  2 May 2025 02:51:08 +0800
From: Alan Huang <mmpgouride@...il.com>
To: kent.overstreet@...ux.dev,
	kees@...nel.org,
	gustavoars@...nel.org,
	thorsten.blum@...lux.com
Cc: linux-bcachefs@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Alan Huang <mmpgouride@...il.com>
Subject: [PATCH] bcachefs: Add a comment to clarify the removal of __counted_by

Signed-off-by: Alan Huang <mmpgouride@...il.com>
---
 fs/bcachefs/xattr_format.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/bcachefs/xattr_format.h b/fs/bcachefs/xattr_format.h
index e9f810539552..8fe0bb897038 100644
--- a/fs/bcachefs/xattr_format.h
+++ b/fs/bcachefs/xattr_format.h
@@ -13,6 +13,12 @@ struct bch_xattr {
 	__u8			x_type;
 	__u8			x_name_len;
 	__le16			x_val_len;
+	/*
+	 * Do not reintroduce __counted_by(x_name_len) here.
+	 * There is a value following x_name. __counted_by requires
+	 * that the flexible array member contains exactly the
+	 * amount of elements that are specified.
+	 */
 	__u8			x_name[];
 } __packed __aligned(8);
 
-- 
2.48.1