linux-hardening - Re: [PATCH] leds: el15203000: Annotate struct el15203000 with __counted

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Message-ID: <6c387921-0f30-094e-204b-33ae0daa1f55@embeddedor.com>
Date:   Fri, 15 Sep 2023 14:46:47 -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: el15203000: Annotate struct el15203000 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 el15203000.
> 
> [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-el15203000.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-el15203000.c b/drivers/leds/leds-el15203000.c
> index 7e7b617bcd56..d40194a3029f 100644
> --- a/drivers/leds/leds-el15203000.c
> +++ b/drivers/leds/leds-el15203000.c
> @@ -80,7 +80,7 @@ struct el15203000 {
>   	struct spi_device	*spi;
>   	unsigned long		delay;
>   	size_t			count;
> -	struct el15203000_led	leds[];
> +	struct el15203000_led	leds[] __counted_by(count);
>   };
>   
>   #define to_el15203000_led(d)	container_of(d, struct el15203000_led, ldev)