linux-hardening - Re: [PATCH] leds: lm3697: Annotate struct lm3697 with __counted

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Date:   Fri, 15 Sep 2023 14:47:19 -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: lm3697: Annotate struct lm3697 with __counted_by



On 9/15/23 14:10, 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 lm3697.
> 
> [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-lm3697.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-lm3697.c b/drivers/leds/leds-lm3697.c
> index cfb8ac220db6..380d17a58fe9 100644
> --- a/drivers/leds/leds-lm3697.c
> +++ b/drivers/leds/leds-lm3697.c
> @@ -89,7 +89,7 @@ struct lm3697 {
>   	int bank_cfg;
>   	int num_banks;
>   
> -	struct lm3697_led leds[];
> +	struct lm3697_led leds[] __counted_by(num_banks);
>   };
>   
>   static const struct reg_default lm3697_reg_defs[] = {