linux-hardening - Re: [PATCH] media: allegro: Annotate struct mcu_msg_push_buffers_internal with __counted

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Message-ID: <3527897d-6fb1-7fa0-ac8d-7a53f4d00fe4@embeddedor.com>
Date: Sat, 23 Sep 2023 10:25:50 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 Michael Tretter <m.tretter@...gutronix.de>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...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] media: allegro: Annotate struct
 mcu_msg_push_buffers_internal with __counted_by



On 9/22/23 11:49, 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 mcu_msg_push_buffers_internal.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Michael Tretter <m.tretter@...gutronix.de>
> Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: linux-media@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/media/platform/allegro-dvt/allegro-mail.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/allegro-dvt/allegro-mail.h b/drivers/media/platform/allegro-dvt/allegro-mail.h
> index a5686058d754..c0c9013f1aab 100644
> --- a/drivers/media/platform/allegro-dvt/allegro-mail.h
> +++ b/drivers/media/platform/allegro-dvt/allegro-mail.h
> @@ -184,7 +184,7 @@ struct mcu_msg_push_buffers_internal {
>   	struct mcu_msg_header header;
>   	u32 channel_id;
>   	size_t num_buffers;
> -	struct mcu_msg_push_buffers_internal_buffer buffer[];
> +	struct mcu_msg_push_buffers_internal_buffer buffer[] __counted_by(num_buffers);
>   };
>   
>   struct mcu_msg_put_stream_buffer {