linux-kernel - [PATCH] unwind deferred: Annotate struct unwind_cache with __counted

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Message-ID: <20251114122748.222833-1-thorsten.blum@linux.dev>
Date: Fri, 14 Nov 2025 13:27:47 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Josh Poimboeuf <jpoimboe@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] unwind deferred: Annotate struct unwind_cache with __counted_by

Add the __counted_by() compiler attribute to the flexible array member
'entries' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

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

diff --git a/include/linux/unwind_deferred_types.h b/include/linux/unwind_deferred_types.h
index 33b62ac25c86..d4b67f0116f3 100644
--- a/include/linux/unwind_deferred_types.h
+++ b/include/linux/unwind_deferred_types.h
@@ -5,7 +5,7 @@
 struct unwind_cache {
 	unsigned long		unwind_completed;
 	unsigned int		nr_entries;
-	unsigned long		entries[];
+	unsigned long		entries[] __counted_by(nr_entries);
 };
 
 /*
-- 
2.51.1