linux-kernel - Re: [PATCH v6] can, tty: can327 CAN/ldisc driver for ELM327 based OBD-II adapters

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 13 May 2022 13:52:23 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <vincent.mailhol@...il.com>
Cc:     Max Staudt <max@...as.org>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oliver Neukum <oneukum@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] can, tty: can327 CAN/ldisc driver for ELM327 based
 OBD-II adapters

On 13.05.2022 11:38:31, Vincent Mailhol wrote:
> > +
> > +       /* We shouldn't get here after a hardware fault:
> > +        * can_bus_off() calls netif_carrier_off()
> > +        */
> > +       WARN_ON_ONCE(elm->uart_side_failure);
> > +
> > +       if (!elm->tty ||
> > +           elm->uart_side_failure ||
> > +           elm->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
> 
> Can the xmit function get called when CAN_CTRLMODE_LISTENONLY is on?

I think yes. You can skip the whole CAN stack by injecting CAN frames in
the kernel via the packet socket. Maybe we should add a check to
can_dropped_invalid_skb().

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)