linux-kernel - Re: [PATCH v2] misc: fastrpc: restrict user apps from sending kernel RPC messages

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Message-ID: <CAA8EJpo-U74KAyoHY=9wutk=iCOBMv6T1Ez-MEogYdPE6X1yCQ@mail.gmail.com>
Date:   Mon, 1 Mar 2021 18:34:10 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        open list <linux-kernel@...r.kernel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Jonathan Marek <jonathan@...ek.ca>, stable@...r.kernel.org
Subject: Re: [PATCH v2] misc: fastrpc: restrict user apps from sending kernel
 RPC messages

On Sat, 13 Feb 2021 at 11:25, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Feb 12, 2021 at 10:26:58PM +0300, Dmitry Baryshkov wrote:
> > Verify that user applications are not using the kernel RPC message
> > handle to restrict them from directly attaching to guest OS on the
> > remote subsystem. This is a port of CVE-2019-2308 fix.
>
> A port of the fix of what to what?

I'm sorry for the confusion. It is a port of the original
Qualcomm/CodeAurora fix to the upstream driver.

See https://source.codeaurora.org/quic/la/kernel/msm-4.9/commit/?id=cc2e11eeb988964af72309f71b0fb21c11ed6ca9,

> Is this to go only into a stable tree (if so what ones and what is the
> id in Linus's tree), or is it to go into Linus's tree like normal (if so
> how can this be a port)?

It's a port from QCI kernel, not a backport.
So I'd prefer for it to go into Linus's tree (and then be backported
to relevant -stable trees).

-- 
With best wishes
Dmitry