linux-kernel - Re: [PATCH] drm/nouveau/fb/ga102: Replace zero-length array of trailing structs with flex-array

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Date:   Fri, 18 Nov 2022 16:38:52 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Ben Skeggs <bskeggs@...hat.com>, Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Gourav Samaiya <gsamaiya@...dia.com>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] drm/nouveau/fb/ga102: Replace zero-length array of
 trailing structs with flex-array

On Fri, Nov 18, 2022 at 01:12:08PM -0800, Kees Cook wrote:
> Zero-length arrays are deprecated[1] and are being replaced with
> flexible array members in support of the ongoing efforts to tighten the
> FORTIFY_SOURCE routines on memcpy(), correctly instrument array indexing
> with UBSAN_BOUNDS, and to globally enable -fstrict-flex-arrays=3.
> 
> Replace zero-length array with flexible-array member.
> 
> This results in no differences in binary output.
> 
> [1] https://github.com/KSPP/linux/issues/78
> 
> Cc: Ben Skeggs <bskeggs@...hat.com>
> Cc: Karol Herbst <kherbst@...hat.com>
> Cc: Lyude Paul <lyude@...hat.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Gourav Samaiya <gsamaiya@...dia.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: nouveau@...ts.freedesktop.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks!
--
Gustavo

> ---
>  drivers/gpu/drm/nouveau/include/nvfw/hs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/include/nvfw/hs.h b/drivers/gpu/drm/nouveau/include/nvfw/hs.h
> index 8c4cd08a7b5f..8b58b668fc0c 100644
> --- a/drivers/gpu/drm/nouveau/include/nvfw/hs.h
> +++ b/drivers/gpu/drm/nouveau/include/nvfw/hs.h
> @@ -52,7 +52,7 @@ struct nvfw_hs_load_header_v2 {
>  	struct {
>  		u32 offset;
>  		u32 size;
> -	} app[0];
> +	} app[];
>  };
>  
>  const struct nvfw_hs_load_header_v2 *nvfw_hs_load_header_v2(struct nvkm_subdev *, const void *);
> -- 
> 2.34.1
>