linux-hardening - Re: [PATCH] leds: aw200xx: Annotate struct aw200xx with __counted

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Message-ID: <0030c52a-3a63-3405-cbfb-b3d16cb6c502@embeddedor.com>
Date:   Fri, 15 Sep 2023 14:46:20 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, Pavel Machek <pavel@....cz>
Cc:     Lee Jones <lee@...nel.org>, linux-leds@...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] leds: aw200xx: Annotate struct aw200xx with __counted_by



On 9/15/23 14:09, 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 aw200xx.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Pavel Machek <pavel@....cz>
> Cc: Lee Jones <lee@...nel.org>
> Cc: linux-leds@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/leds/leds-aw200xx.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
> index 691a743cc9b0..4d517cace3e7 100644
> --- a/drivers/leds/leds-aw200xx.c
> +++ b/drivers/leds/leds-aw200xx.c
> @@ -112,7 +112,7 @@ struct aw200xx {
>   	struct mutex mutex;
>   	u32 num_leds;
>   	u32 display_rows;
> -	struct aw200xx_led leds[];
> +	struct aw200xx_led leds[] __counted_by(num_leds);
>   };
>   
>   static ssize_t dim_show(struct device *dev, struct device_attribute *devattr,