linux-kernel - Re: [PATCH v1] misc: fastrpc: Reassign memory ownership only for remote heap

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Date:   Fri, 12 May 2023 13:40:14 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Ekansh Gupta <quic_ekangupt@...cinc.com>,
        linux-arm-msm@...r.kernel.org, ekangupt@....qualcomm.com,
        linux-kernel@...r.kernel.org, bkumar@....qualcomm.com,
        fastrpc.upstream@....qualcomm.com, stable <stable@...nel.org>
Subject: Re: [PATCH v1] misc: fastrpc: Reassign memory ownership only for
 remote heap



On 29/03/2023 11:09, Greg KH wrote:
> On Tue, Mar 21, 2023 at 08:53:33PM +0000, Srinivas Kandagatla wrote:
>>
>>
>> On 21/03/2023 10:21, Ekansh Gupta wrote:
>>> The userspace map request for remote heap allocates CMA memory.
>>> The ownership of this memory needs to be reassigned to proper
>>> owners to allow access from the protection domain running on
>>> DSP. This reassigning of ownership is not correct if done for
>>> any other supported flags.
>>>
>>> When any other flag is requested from userspace, fastrpc is
>>> trying to reassign the ownership of memory and this reassignment
>>> is getting skipped for remote heap request which is incorrect.
>>> Add proper flag check to reassign the memory only if remote heap
>>> is requested.
>>>
>>> Fixes: 532ad70c6d44 ("misc: fastrpc: Add mmap request assigning for static PD pool")
>>> Cc: stable <stable@...nel.org>
>>> Tested-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
>>> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
>>
>> Thanks for fixing this,  without this fix the code inside if condition was a
>> dead code.
>>
>>
>> Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> Are you going to be collecting these and sending them on?  If not,
> please do.
Sorry for long delay,
I will take care of collecting fastrpc patches and send it.

--srini



> 
> thanks,
> 
> greg k-h