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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Mon, 21 Nov 2022 12:43:25 -0500
Message-ID: <CADnq5_NAaX6t3r+J8qcEfL1-8SOunU9YR3HqohmuGTm_xBow+g@mail.gmail.com>
Subject: Re: [PATCH] [next] drm/amdgpu: Replace remaining 1-element array with flex-array
To:     Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Cc:     Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
        "Pan, Xinhui" <Xinhui.Pan@amd.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rongguang Wei <weirongguang@kylinos.cn>,
        Slark Xiao <slark_xiao@163.com>, amd-gfx@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-hardening@vger.kernel.org
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Applied.  Thanks!

Alex

On Mon, Nov 21, 2022 at 2:26 AM Paulo Miguel Almeida
<paulo.miguel.almeida.rodenas@gmail.com> wrote:
>
> One-element arrays are deprecated, and we are replacing them with
> flexible array members instead. So, replace one-element array with
> flexible-array member in struct GOP_VBIOS_CONTENT and refactor the
> rest of the code accordingly.
>
> Important to mention is that doing a build before/after this patch
> results in no functional binary output differences.
>
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [1].
>
> Link: https://github.com/KSPP/linux/issues/79
> Link: https://github.com/KSPP/linux/issues/238
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1]
>
> Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
> ---
> This should be the last one-element array that had references in source
> code. Given the way it was used, no *.c code change was required.
>
> I will move on to the atombios.h in the radeon driver.
> ---
>  drivers/gpu/drm/amd/include/atombios.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/include/atombios.h b/drivers/gpu/drm/amd/include/atombios.h
> index 4dc738c51771..b78360a71bc9 100644
> --- a/drivers/gpu/drm/amd/include/atombios.h
> +++ b/drivers/gpu/drm/amd/include/atombios.h
> @@ -9292,7 +9292,7 @@ typedef struct {
>
>  typedef struct {
>    VFCT_IMAGE_HEADER   VbiosHeader;
> -  UCHAR   VbiosContent[1];
> +  UCHAR   VbiosContent[];
>  }GOP_VBIOS_CONTENT;
>
>  typedef struct {
> --
> 2.37.3
>