netdev - Re: KASAN: use-after-free Read in selinux_netlbl_socket

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Date:   Mon, 4 Feb 2019 09:04:11 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.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 Fri, Feb 1, 2019 at 6:58 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> 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.

syzbot can tell if it's not fixed, but for that we need to mark these
bugs as fixed, otherwise syzbot will just consider any new crashes as
the same old bug so nothing to notify about.

#syz fix: netrom: switch to sock timer API