linux-kernel - Re: [PATCH 1/2] cx82310_eth: re-enable ethernet mode after router reboot

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]

Message-Id: <202010121242.55826.linux@zary.sk>
Date:   Mon, 12 Oct 2020 12:42:55 +0200
From:   Ondrej Zary <linux@...y.sk>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Oliver Neukum <oneukum@...e.com>, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] cx82310_eth: re-enable ethernet mode after router reboot

On Monday 12 October 2020, Jakub Kicinski wrote:
> On Sat, 10 Oct 2020 16:00:46 +0200 Ondrej Zary wrote:
> > When the router is rebooted without a power cycle, the USB device
> > remains connected but its configuration is reset. This results in
> > a non-working ethernet connection with messages like this in syslog:
> > 	usb 2-2: RX packet too long: 65535 B
> >
> > Re-enable ethernet mode when receiving a packet with invalid size of
> > 0xffff.
>
> Patch looks good, but could you explain what's a reboot without a power
> cycle in this case? The modem gets reset but USB subsystem doesn't know
> it and doesn't go though a unbind() + bind() cycle?

The router can be rebooted through the web interface. The reboot does not 
disconnect the USB device - it remains connected as if nothing happened. Only 
wrong data starts to come in.

-- 
Ondrej Zary