linux-hardening - Re: [PATCH] media: amphion: Replace zero-length array with flexible-array member

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Date:   Fri, 27 May 2022 17:08:54 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Ming Qian <ming.qian@....com>, Shijie Qin <shijie.qin@....com>,
        Zhou Peng <eagle.zhou@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] media: amphion: Replace zero-length array with
 flexible-array member

On Fri, May 27, 2022 at 02:29:53PM -0700, Kees Cook wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should no
> longer be used[2][3].
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
> [3] https://github.com/KSPP/linux/issues/78
> 
> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
> Cc: Ming Qian <ming.qian@....com>
> Cc: Shijie Qin <shijie.qin@....com>
> Cc: Zhou Peng <eagle.zhou@....com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Gustavo A. R. Silva <gustavoars@...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/amphion/vpu_dbg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/amphion/vpu_dbg.c b/drivers/media/platform/amphion/vpu_dbg.c
> index da62bd718fb8..f72c8a506b22 100644
> --- a/drivers/media/platform/amphion/vpu_dbg.c
> +++ b/drivers/media/platform/amphion/vpu_dbg.c
> @@ -27,7 +27,7 @@ struct print_buf_desc {
>  	u32 bytes;
>  	u32 read;
>  	u32 write;
> -	char buffer[0];
> +	char buffer[];
>  };
>  
>  static char *vb2_stat_name[] = {
> -- 
> 2.32.0
>