linux-hardening - Re: [PATCH v2] [next] drm/radeon: Replace one-element array with flexible-array member

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Date:   Fri, 28 Oct 2022 21:04:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] [next] drm/radeon: Replace one-element array with
 flexible-array member

On Sat, Oct 29, 2022 at 04:32:05PM +1300, Paulo Miguel Almeida 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 _ATOM_FAKE_EDID_PATCH_RECORD and
> refactor the rest of the code accordingly.
> 
> It's worth mentioning that doing a build before/after this patch results
> in no binary output differences.

Thanks for checking it!

> 
> 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/239
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1]
> 
> Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook