linux-kernel - [PATCH] nfs: Annotate struct pnfs_commit_array with __counted

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Message-ID: <20240930173352.136553-4-thorsten.blum@linux.dev>
Date: Mon, 30 Sep 2024 19:33:54 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Trond Myklebust <trondmy@...nel.org>,
	Anna Schumaker <anna@...nel.org>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] nfs: Annotate struct pnfs_commit_array with __counted_by()

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

Compile-tested only.

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

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 12d8e47bc5a3..559273a0f16d 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1336,7 +1336,7 @@ struct pnfs_commit_array {
 	struct rcu_head rcu;
 	refcount_t refcount;
 	unsigned int nbuckets;
-	struct pnfs_commit_bucket buckets[];
+	struct pnfs_commit_bucket buckets[] __counted_by(nbuckets);
 };
 
 struct pnfs_ds_commit_info {
-- 
2.46.2