linux-hardening - [PATCH] USB: serial: garmin_gps: annotate struct garmin_packet with __counted

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Message-Id: <20240619-garmin_gps_counted_by-v1-1-d8d816f085d9@gmail.com>
Date: Wed, 19 Jun 2024 11:40:57 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Johan Hovold <johan@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-hardening@...r.kernel.org, llvm@...ts.linux.dev, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH] USB: serial: garmin_gps: annotate struct garmin_packet
 with __counted_by

Use the __counted_by compiler attribute for the data[] flexible array member
to improve the results of array bound sanitizers.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
The size is assigned before the first reference to the flexible array
(see pkt_add()), which allows for a straightforward annotation without
further modifications.
---
 drivers/usb/serial/garmin_gps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
index 670e942fdaaa..57df6ad183ff 100644
--- a/drivers/usb/serial/garmin_gps.c
+++ b/drivers/usb/serial/garmin_gps.c
@@ -104,7 +104,7 @@ struct garmin_packet {
 	int               seq;
 	/* the real size of the data array, always > 0 */
 	int               size;
-	__u8              data[];
+	__u8              data[] __counted_by(size);
 };

 /* structure used to keep the current state of the driver */

---
base-commit: 0c52056d9f77508cb6d4d68d3fc91c6c08ec71af
change-id: 20240619-garmin_gps_counted_by-376545960353

Best regards,
-- 
Javier Carrasco <javier.carrasco.cruz@...il.com>