linux-kernel - Re: [PATCH v3 7/9] misc: fastrpc: Restrict untrusted app to attach to privileged PD

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Message-ID: <m6wt2nvxjdyll3wg2hlfyixwtcjag4nucsgriygytpisathlsw@ba4avjyceqo6>
Date: Fri, 31 May 2024 02:46:45 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>
Cc: srinivas.kandagatla@...aro.org, linux-arm-msm@...r.kernel.org, 
	gregkh@...uxfoundation.org, quic_bkumar@...cinc.com, linux-kernel@...r.kernel.org, 
	quic_chennak@...cinc.com, stable <stable@...nel.org>
Subject: Re: [PATCH v3 7/9] misc: fastrpc: Restrict untrusted app to attach
 to privileged PD

On Thu, May 30, 2024 at 03:50:25PM +0530, Ekansh Gupta wrote:
> Untrusted application with access to only non-secure fastrpc device
> node can attach to root_pd or static PDs if it can make the respective
> init request. This can cause problems as the untrusted application
> can send bad requests to root_pd or static PDs. Add changes to reject
> attach to privileged PDs if the request is being made using non-secure
> fastrpc device node.
> 
> Fixes: 0871561055e6 ("misc: fastrpc: Add support for audiopd")
> Cc: stable <stable@...nel.org>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
> ---
>  drivers/misc/fastrpc.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry