linux-kernel - Re: KASAN: use-after-free Read in binder_release

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Message-ID: <CAB0TPYHLxjfmisvmVLOw+6XjV+mt=buZPJFCpg44JZpGimjLjw@mail.gmail.com>
Date:   Mon, 23 Apr 2018 11:41:04 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Eric Biggers <ebiggers3@...il.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Todd Kjos <tkjos@...roid.com>,
        syzbot <syzbot+0cf1f1aa154f56ff2e8d@...kaller.appspotmail.com>
Subject: Re: KASAN: use-after-free Read in binder_release_work

On Mon, Apr 23, 2018 at 11:28 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> https://syzkaller.appspot.com/bug?extid=09e05aba06723a94d43d
> and that happened in binder. But then syzkaller found a reproducer for
> it, but it turned out to be in rdma subsystem. It's generally not
> possible to properly distinguish different bugs that look similar, and
> if syzbot does more sensitive bug classification, then it will also
> inevitably report more duplicates. So that bug was closed as an rdma
> bug.

Thanks for the clarification! It looks like I sent the patch with the
original reported-by tag after it was closed as an rdma issue; would
it help if syzbot sent a reply saying this bug was already marked as
closed with a different commit, or are there other complications with
that?

Thanks,
Martijn

> Now syzbot already skips list_del frame and takes the next one, so it
> should become slightly better.
>
> Let's close this one with the binder fix (since that one was closed
> with an rdma fix):
>
> #syz fix: ANDROID: binder: prevent transactions into own process.