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

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Message-ID: <c532ea34f7854217064e0fe1a2b6444f878e9c67.camel@redhat.com>
Date:   Wed, 18 Jan 2023 16:15:11 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Ben Skeggs <bskeggs@...hat.com>, Karol Herbst <kherbst@...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: [RESEND][PATCH] drm/nouveau/fb/ga102: Replace zero-length array
 of trailing structs with flex-array

Hi! Sorry for the late response, I've had my head buried in some regressions
from AMD for a while now and am now just catching up on my email.

Does this still need to be pushed upstream?

On Tue, 2023-01-03 at 18:52 -0600, Gustavo A. R. Silva wrote:
> On Tue, Jan 03, 2023 at 03:48:36PM -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>
> 
> Here is my RB again:
> 
> Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> 
> Thanks!
> --
> Gustavo
> 
> > ---
> > Sent before as: https://lore.kernel.org/all/20221118211207.never.039-kees@kernel.org/
> > ---
> >  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
> > 
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat