linux-kernel - Re: race between flush_to_ldisc and pty

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Message-ID: <20190201142109.GA3211@kroah.com>
Date:   Fri, 1 Feb 2019 15:21:09 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Maninder Singh <maninder1.s@...sung.com>
Cc:     "peter@...leysoftware.com" <peter@...leysoftware.com>,
        "jslaby@...e.com" <jslaby@...e.com>,
        "keun-o.park@...kmatter.ae" <keun-o.park@...kmatter.ae>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        AMIT SAHRAWAT <a.sahrawat@...sung.com>,
        Vaneet Narang <v.narang@...sung.com>,
        Rohit Thapliyal <r.thapliyal@...sung.com>,
        Ayush Mittal <ayush.m@...sung.com>
Subject: Re: race between flush_to_ldisc and pty_cleanup

On Fri, Feb 01, 2019 at 07:03:26PM +0530, Maninder Singh wrote:
> Hi,
> 
> 
> There is some race condition between tty_port_put and flush_to_ldisc
> which lead to use after free case:
> (Kernel 4.1)

Wait, 4.1 is _REALLY_ old and obsolete and broken in numerous known
places.

Can you duplicate this on 4.20, or better yet, 5.0-rc4?  Lots of tty and
ldisc fixes has gone into the tree in the past 3 1/2 years since that
kernel was released.

thanks,

greg k-h