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

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Message-ID: <CAM_iQpV42EyuUFcxR7kn7WipkTAkvSxMc+-Me_QZCCUziy_wiQ@mail.gmail.com>
Date:   Fri, 1 Feb 2019 09:58:21 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Paul Moore <paul@...l-moore.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        David Miller <davem@...emloft.net>,
        linux-hams <linux-hams@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzbot <syzbot+1bfc00ca3aabe5bcd4cb@...kaller.appspotmail.com>,
        Eric Paris <eparis@...isplace.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Smalley <sds@...ho.nsa.gov>, selinux@...r.kernel.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in selinux_netlbl_socket_setsockopt

On Thu, Jan 31, 2019 at 10:56 PM Dmitry Vyukov <dvyukov@...gle.com> wrote:
> Hi Paul,
>
> Searching for af_netrom across other syzbot bugs:
> https://groups.google.com/forum/#!searchin/syzkaller-bugs/af_netrom%7Csort:date
>
> I see at least:
> https://syzkaller.appspot.com/bug?extid=b0b1952f5864b4009b09
> https://syzkaller.appspot.com/bug?extid=febf3c50d4262e578b1c
> https://syzkaller.appspot.com/bug?extid=defa700d16f1bd1b9a05
>
> Which suggests there are some serious lifetime problems in netrom
> sockets. That would probably explain this crash as well.

This is supposed to be fixed by:
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=63346650c1a94a92be61a57416ac88c0a47c4327

Please let me know if it isn't.

Thanks.