linux-kernel - Re: [PATCH] binder: prevent transactions to context manager from its own process.

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Date:   Mon, 14 Oct 2019 10:37:25 -0700
From:   Hridya Valsaraju <hridya@...gle.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Todd Kjos <tkjos@...roid.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>,
        syzbot+8b3c354d33c4ac78bfad@...kaller.appspotmail.com
Subject: Re: [PATCH] binder: prevent transactions to context manager from its
 own process.

On Fri, Oct 11, 2019 at 3:11 PM Jann Horn <jannh@...gle.com> wrote:
>
> On Fri, Oct 11, 2019 at 11:59 PM Jann Horn <jannh@...gle.com> wrote:
> > (I think you could also let A receive a handle
> > to itself and then transact with itself, but I haven't tested that.)
>
> Ignore this sentence, that's obviously wrong because same-binder_proc
> nodes will always show up as a binder, not a handle.

Thank you for the email and steps to reproduce the issue Jann. I need
some time to take a look at the same and I will get back to you once I
understand it and hopefully have a fix. We do want to disallow
same-process transactions. Here is a little bit more of context for
the patch: https://lkml.org/lkml/2018/3/28/173