linux-kernel - [PATCH] isofs: Annotate struct SL_component with __counted

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Message-ID: <20240830164902.112682-2-thorsten.blum@toblux.com>
Date: Fri, 30 Aug 2024 18:49:03 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: jack@...e.cz,
	kees@...nel.org,
	gustavoars@...nel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH] isofs: Annotate struct SL_component with __counted_by()

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

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
 fs/isofs/rock.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/isofs/rock.h b/fs/isofs/rock.h
index ee9660e9671c..7755e587f778 100644
--- a/fs/isofs/rock.h
+++ b/fs/isofs/rock.h
@@ -44,7 +44,7 @@ struct RR_PN_s {
 struct SL_component {
 	__u8 flags;
 	__u8 len;
-	__u8 text[];
+	__u8 text[] __counted_by(len);
 } __attribute__ ((packed));
 
 struct RR_SL_s {
-- 
2.46.0