linux-kernel - [PATCH] Input: Annotate struct input_leds with __counted

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Message-Id: <20230922175031.work.467-kees@kernel.org>
Date:   Fri, 22 Sep 2023 10:50:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Kees Cook <keescook@...omium.org>, linux-input@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: [PATCH] Input: Annotate struct input_leds with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct input_leds.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/input/input-leds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
index 0b11990ade46..0e935914bc3a 100644
--- a/drivers/input/input-leds.c
+++ b/drivers/input/input-leds.c
@@ -44,7 +44,7 @@ struct input_led {
 struct input_leds {
 	struct input_handle handle;
 	unsigned int num_leds;
-	struct input_led leds[];
+	struct input_led leds[] __counted_by(num_leds);
 };
 
 static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev)
-- 
2.34.1