linux-kernel - Re: [PATCH] binder: add flag to clear buffer on txn complete

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Message-ID: <CAHRSSEypnwWwNNvs0giYTjOeUXJuAb-4MNTymVf1uUJr8aUwSQ@mail.gmail.com>
Date:   Sat, 21 Nov 2020 09:11:42 -0800
From:   Todd Kjos <tkjos@...gle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Christian Brauner <christian@...uner.io>,
        Arve Hjønnevåg <arve@...roid.com>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Martijn Coenen <maco@...gle.com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Steven Moreland <smoreland@...gle.com>
Subject: Re: [PATCH] binder: add flag to clear buffer on txn complete

On Fri, Nov 20, 2020 at 11:14 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Fri, Nov 20, 2020 at 03:37:43PM -0800, Todd Kjos wrote:
> > Add a per-transaction flag to indicate that the buffer
> > must be cleared when the transaction is complete to
> > prevent copies of sensitive data from being preserved
> > in memory.
> >
> > Signed-off-by: Todd Kjos <tkjos@...gle.com>
> > ---
>
> DOes this need to be backported to stable kernels as well?

It doesn't technically qualify for stable since it is a new feature --
not a bug fix. We will want it for Android S launch devices (5.4+), so
it would be handy to have it in 5.4.y and later.

>
> thanks,
>
> greg k-h
>
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