linux-kernel - CVE-2022-1462: race condition vulnerability in drivers/tty/tty

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Message-ID: <20220601183426.GD2168@kadam>
Date:   Wed, 1 Jun 2022 21:34:26 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     一只狗 <chennbnbnb@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: CVE-2022-1462: race condition vulnerability in
 drivers/tty/tty_buffers.c

Hi Greg, Jiri,

I searched lore.kernel.org and it seemed like CVE-2022-1462 might not
have ever been reported to you?  Here is the original email with the
syzkaller reproducer.

https://seclists.org/oss-sec/2022/q2/155

The reporter proposed a fix, but it won't work.  Smatch says that some
of the callers are already holding the port->lock.  For example,
sci_dma_rx_complete() will deadlock.

regards,
dan carpenter