linux-kernel - [PATCH] btrfs: Annotate structs with __counted

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Message-ID: <20240812103619.2720-2-thorsten.blum@toblux.com>
Date: Mon, 12 Aug 2024 12:36:20 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: clm@...com,
	josef@...icpanda.com,
	dsterba@...e.com,
	kees@...nel.org,
	gustavoars@...nel.org
Cc: linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH] btrfs: Annotate structs with __counted_by()

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

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

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 37a09ebb34dd..f28fa318036b 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -551,7 +551,7 @@ struct btrfs_io_context {
 	 * stripes[data_stripes + 1]:	The Q stripe (only for RAID6).
 	 */
 	u64 full_stripe_logical;
-	struct btrfs_io_stripe stripes[];
+	struct btrfs_io_stripe stripes[] __counted_by(num_stripes);
 };
 
 struct btrfs_device_info {
@@ -591,7 +591,7 @@ struct btrfs_chunk_map {
 	int io_width;
 	int num_stripes;
 	int sub_stripes;
-	struct btrfs_io_stripe stripes[];
+	struct btrfs_io_stripe stripes[] __counted_by(num_stripes);
 };
 
 #define btrfs_chunk_map_size(n) (sizeof(struct btrfs_chunk_map) + \
-- 
2.46.0