linux-hardening - Re: [PATCH 4/9] drm/msm/dpu: Annotate struct dpu_hw_intr with __counted

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Message-ID: <ebf2ca90-2582-4221-5aa2-45e0d98602a0@embeddedor.com>
Date: Fri, 22 Sep 2023 20:15:40 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, David Airlie <airlied@...il.com>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar
 <quic_abhinavk@...cinc.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
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 Daniel Vetter <daniel@...ll.ch>, Bjorn Andersson <andersson@...nel.org>,
 linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, Emma Anholt <emma@...olt.net>,
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Subject: Re: [PATCH 4/9] drm/msm/dpu: Annotate struct dpu_hw_intr with
 __counted_by

On 9/22/23 11:32, 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 dpu_hw_intr.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Rob Clark <robdclark@...il.com>
> Cc: Abhinav Kumar <quic_abhinavk@...cinc.com>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Sean Paul <sean@...rly.run>
> Cc: Marijn Suijten <marijn.suijten@...ainline.org>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: dri-devel@...ts.freedesktop.org
> Cc: freedreno@...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/msm/disp/dpu1/dpu_hw_interrupts.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> index dab761e54863..50cf9523d367 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> @@ -61,7 +61,7 @@ struct dpu_hw_intr {
>   		void (*cb)(void *arg, int irq_idx);
>   		void *arg;
>   		atomic_t count;
> -	} irq_tbl[];
> +	} irq_tbl[] __counted_by(total_irqs);
>   };
>   
>   /**