linux-hardening - Re: [PATCH 1/2] Input: ims-pcu - annotate struct ims_pcu_flash_fmt with __counted

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Message-ID: <26028fee-8043-4f81-a062-bbff12f4c904@embeddedor.com>
Date: Wed, 19 Jun 2024 15:26:51 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Kees Cook <kees@...nel.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/2] Input: ims-pcu - annotate struct ims_pcu_flash_fmt
 with __counted_by

On 19/06/24 23:13, Javier Carrasco wrote:
> Use the __counted_by compiler attribute for the data[] flexible array
> member to improve the results of array bound sanitizers.
> 
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>

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

Thanks
-- 
Gustavo

> ---
>   drivers/input/misc/ims-pcu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
> index 408a586f8c36..91f8ad826238 100644
> --- a/drivers/input/misc/ims-pcu.c
> +++ b/drivers/input/misc/ims-pcu.c
> @@ -761,7 +761,7 @@ static int ims_pcu_switch_to_bootloader(struct ims_pcu *pcu)
>   struct ims_pcu_flash_fmt {
>   	__le32 addr;
>   	u8 len;
> -	u8 data[];
> +	u8 data[] __counted_by(len);
>   };
>   
>   static unsigned int ims_pcu_count_fw_records(const struct firmware *fw)
>