linux-kernel - Re: binderfs interferes with syzkaller?

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Message-ID: <20200126093506.oa2ee5kbptur4zhz@wittgenstein>
Date:   Sun, 26 Jan 2020 10:35:07 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Christian Brauner <christian@...uner.io>,
        Hridya Valsaraju <hridya@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: binderfs interferes with syzkaller?

On Sun, Jan 26, 2020 at 09:55:35AM +0100, Greg Kroah-Hartman wrote:
> On Sat, Jan 25, 2020 at 06:49:49PM +0100, Dmitry Vyukov wrote:
> > Hi binder maintainers,
> > 
> > It seems that something has happened and now syzbot has 0 coverage in
> > drivers/android/binder.c:
> > https://storage.googleapis.com/syzkaller/cover/ci-upstream-kasan-gce-root.html
> > It covered at least something there before as it found some bugs in binder code.
> > I _suspect_ it may be related to introduction binderfs, but it's
> > purely based on the fact that binderfs changed lots of things there.
> > And I see it claims to be backward compatible.
> 
> It is backwards compatible if you mount binderfs, right?

Yes, it is backwards compatible. The devices that would usually be
created in devtmpfs are now created in binderfs. The core
binder-codepaths are the same.

Christian