linux-kernel - Re: [PATCH 4/4] media: venus: hfi: add a check to handle OOB in sfr region

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Message-ID: <a71e75e2-14fb-449f-bb27-2770261708ea@linaro.org>
Date: Tue, 5 Nov 2024 11:27:13 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 4/4] media: venus: hfi: add a check to handle OOB in sfr
 region

On 05/11/2024 08:54, Vikash Garodia wrote:
> sfr->buf_size is in shared memory and can be modified by malicious user.
> OOB write is possible when the size is made higher than actual sfr data
> buffer.
> 
> Cc: stable@...r.kernel.org
> Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files")
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
>   drivers/media/platform/qcom/venus/hfi_venus.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
> index 50d92214190d88eff273a5ba3f95486f758bcc05..c19d6bf686d0f31c6a2f551de3f7eb08031bde85 100644
> --- a/drivers/media/platform/qcom/venus/hfi_venus.c
> +++ b/drivers/media/platform/qcom/venus/hfi_venus.c
> @@ -1041,18 +1041,23 @@ static void venus_sfr_print(struct venus_hfi_device *hdev)
>   {
>   	struct device *dev = hdev->core->dev;
>   	struct hfi_sfr *sfr = hdev->sfr.kva;
> +	u32 size;
>   	void *p;
>   
>   	if (!sfr)
>   		return;
>   
> -	p = memchr(sfr->data, '\0', sfr->buf_size);
> +	size = sfr->buf_size;
> +	if (size > ALIGNED_SFR_SIZE)
> +		return;
> +
> +	p = memchr(sfr->data, '\0', size);
>   	/*
>   	 * SFR isn't guaranteed to be NULL terminated since SYS_ERROR indicates
>   	 * that Venus is in the process of crashing.
>   	 */
>   	if (!p)
> -		sfr->data[sfr->buf_size - 1] = '\0';
> +		sfr->data[size - 1] = '\0';
>   
>   	dev_err_ratelimited(dev, "SFR message from FW: %s\n", sfr->data);
>   }
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>