linux-hardening - [PATCH] ext4: Annotate struct ext4_xattr_inode_array with __counted

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Message-ID: <20240729110454.346918-3-thorsten.blum@toblux.com>
Date: Mon, 29 Jul 2024 13:04:56 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: tytso@....edu,
	adilger.kernel@...ger.ca,
	kees@...nel.org,
	gustavoars@...nel.org
Cc: linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH] ext4: Annotate struct ext4_xattr_inode_array with __counted_by()

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

Remove the now obsolete comment on the count field.

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
 fs/ext4/xattr.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index bd97c4aa8177..e14fb19dc912 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -130,8 +130,8 @@ struct ext4_xattr_ibody_find {
 };
 
 struct ext4_xattr_inode_array {
-	unsigned int count;		/* # of used items in the array */
-	struct inode *inodes[];
+	unsigned int count;
+	struct inode *inodes[] __counted_by(count);
 };
 
 extern const struct xattr_handler ext4_xattr_user_handler;
-- 
2.45.2