linux-kernel - Re: [PATCH 0/3] misc: fastrpc: fix memory corruption

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Date:   Fri, 2 Sep 2022 11:02:35 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] misc: fastrpc: fix memory corruption

Hi Johan,

On 29/08/2022 09:05, Johan Hovold wrote:
> The fastrpc driver uses a fixed-sized array to store its sessions but
> missing and broken sanity checks could lead to memory beyond the array
> being corrupted.
> 
> This specifically happens on SC8280XP platforms that use 14 sessions for
> the compute DSP.
> 
Thanks for doing this.

I see that we hit this issue once again, and the way we are fixing it is 
not really scalable. We should really get rid of FASTRPC_MAX_SESSIONS.

We should allocate the sessions dynamically based in the child node 
count and qcom,nsessions.



thanks,
Srini

> These are all needed for 6.0.
> 
> Johan
> 
> 
> Johan Hovold (3):
>    misc: fastrpc: fix memory corruption on probe
>    misc: fastrpc: fix memory corruption on open
>    misc: fastrpc: increase maximum session count
> 
>   drivers/misc/fastrpc.c | 14 +++++++++-----
>   1 file changed, 9 insertions(+), 5 deletions(-)
>