Re: [PATCH 10/21] dmaengine: sprd: Annotate struct sprd_dma_dev with __counted_by

From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Kees Cook <keescook@chromium.org>, Vinod Koul <vkoul@kernel.org>
Cc: Orson Zhai <orsonzhai@gmail.com>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	Chunyan Zhang <zhang.lyra@gmail.com>,
	dmaengine@vger.kernel.org, Hector Martin <marcan@marcan.st>,
	Sven Peter <sven@svenpeter.dev>,
	Alyssa Rosenzweig <alyssa@rosenzweig.io>,
	Ludovic Desroches <ludovic.desroches@microchip.com>,
	Tudor Ambarus <tudor.ambarus@linaro.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Zhou Wang <wangzhou1@hisilicon.com>, Jie Hai <haijie1@huawei.com>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Green Wan <green.wan@sifive.com>,
	Patrice Chotard <patrice.chotard@foss.st.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>,
	Laxman Dewangan <ldewangan@nvidia.com>,
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	Peter Ujfalusi <peter.ujfalusi@gmail.com>,
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	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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Subject: Re: [PATCH 10/21] dmaengine: sprd: Annotate struct sprd_dma_dev with __counted_by
Date: Thu, 17 Aug 2023 19:24:46 -0600	[thread overview]
Message-ID: <488f56f6-7a46-b8f9-bfc8-5d1934d095ab@embeddedor.com> (raw)
In-Reply-To: <20230817235859.49846-10-keescook@chromium.org>


On 8/17/23 17:58, 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 sprd_dma_dev.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Vinod Koul <vkoul@kernel.org>
> Cc: Orson Zhai <orsonzhai@gmail.com>
> Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
> Cc: Chunyan Zhang <zhang.lyra@gmail.com>
> Cc: dmaengine@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
--
Gustavo

> ---
>   drivers/dma/sprd-dma.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
> index 168aa0bd73a0..07871dcc4593 100644
> --- a/drivers/dma/sprd-dma.c
> +++ b/drivers/dma/sprd-dma.c
> @@ -212,7 +212,7 @@ struct sprd_dma_dev {
>   	struct clk		*ashb_clk;
>   	int			irq;
>   	u32			total_chns;
> -	struct sprd_dma_chn	channels[];
> +	struct sprd_dma_chn	channels[] __counted_by(total_chns);
>   };
>   
>   static void sprd_dma_free_desc(struct virt_dma_desc *vd);

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