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

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Message-ID: <13ed115d-d0ba-f723-ee05-df0da9f56e6c@embeddedor.com>
Date:   Sat, 23 Sep 2023 10:29:23 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     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: Re: [PATCH] Input: Annotate struct input_leds with __counted_by



On 9/22/23 11:50, Kees Cook wrote:
> 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>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   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)