Date: Fri, 22 Sep 2023 15:00:47 -0400
From: Lyude Paul <lyude@...hat.com>
To: Kees Cook <keescook@...omium.org>, David Airlie <airlied@...il.com>
Cc: Ben Skeggs <bskeggs@...hat.com>, Karol Herbst <kherbst@...hat.com>, 
 Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org,
 nouveau@...ts.freedesktop.org, Emma Anholt <emma@...olt.net>, Evan Quan
 <evan.quan@....com>, Alex Deucher <alexander.deucher@....com>, Christian
 König <christian.koenig@....com>, "Pan, Xinhui"
 <Xinhui.Pan@....com>, Xiaojian Du <Xiaojian.Du@....com>, Huang Rui
 <ray.huang@....com>, Kevin Wang <kevin1.wang@....com>, Hawking Zhang
 <Hawking.Zhang@....com>, Jani Nikula <jani.nikula@...ux.intel.com>, Joonas
 Lahtinen <joonas.lahtinen@...ux.intel.com>,  Rodrigo Vivi
 <rodrigo.vivi@...el.com>, Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
 Chris Wilson <chris@...is-wilson.co.uk>, John Harrison
 <john.c.harrison@...el.com>, Andi Shyti <andi.shyti@...ux.intel.com>,
 Matthew Brost <matthew.brost@...el.com>, Rob Clark <robdclark@...il.com>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Dmitry Baryshkov
 <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, Marijn Suijten
 <marijn.suijten@...ainline.org>, Bjorn Andersson <andersson@...nel.org>, 
 Maxime Ripard <mripard@...nel.org>, David Airlie <airlied@...hat.com>, Gerd
 Hoffmann <kraxel@...hat.com>,  Gurchetan Singh
 <gurchetansingh@...omium.org>, Chia-I Wu <olvaffe@...il.com>, Zack Rusin
 <zackr@...are.com>,  VMware Graphics Reviewers
 <linux-graphics-maintainer@...are.com>, Melissa Wen <mwen@...lia.com>,
 Nathan Chancellor <nathan@...nel.org>,  Nick Desaulniers
 <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, Le Ma
 <le.ma@....com>, Lijo Lazar <lijo.lazar@....com>, Yifan Zhang
 <yifan1.zhang@....com>, Prike Liang <Prike.Liang@....com>, Lang Yu
 <Lang.Yu@....com>, Tejas Upadhyay <tejas.upadhyay@...el.com>, Nirmoy Das
 <nirmoy.das@...el.com>, Andrzej Hajda <andrzej.hajda@...el.com>, Neil
 Armstrong <neil.armstrong@...aro.org>,  Kuogee Hsieh
 <quic_khsieh@...cinc.com>, linux-kernel@...r.kernel.org,
 amd-gfx@...ts.freedesktop.org,  intel-gfx@...ts.freedesktop.org,
 linux-arm-msm@...r.kernel.org,  freedreno@...ts.freedesktop.org,
 virtualization@...ts.linux-foundation.org,  llvm@...ts.linux.dev,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH 5/9] drm/nouveau/pm: Annotate struct nvkm_perfdom with
 __counted_by

Reviewed-by: Lyude Paul <lyude@...hat.com>

Thanks!

On Fri, 2023-09-22 at 10:32 -0700, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct nvkm_perfdom.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> 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: dri-devel@...ts.freedesktop.org
> Cc: nouveau@...ts.freedesktop.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h b/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
> index 6ae25d3e7f45..c011227f7052 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
> @@ -82,7 +82,7 @@ struct nvkm_perfdom {
>  	u8  mode;
>  	u32 clk;
>  	u16 signal_nr;
> -	struct nvkm_perfsig signal[];
> +	struct nvkm_perfsig signal[] __counted_by(signal_nr);
>  };
>  
>  struct nvkm_funcdom {

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

Powered by blists - more mailing lists