Re: Arrested Development

[Michael Buesch <mb@bu3sch.de>]

On Sunday 08 July 2007 20:15:24 Ulrich Kunitz wrote:
> On 07-07-08 17:22 Andy Green wrote:
> 
> > I rebooted into the new kernel and did this only
> > 
> > # iwconfig wlan0 mode monitor
> > # ifconfig wlan0 up
> > # iwconfig wlan0 channel 6
> > # tcpdump -i wlan0
> > 
> > But all I could see were beacons, this is despite I am ssh-d into that
> > box over the same channel 6 network with WPA and should surely be seeing
> > the encrypted packets?
> 
> I assume you were connected over a different interface. It appears
> that the code, which enables the reception of all packets hasn't
> been called or is wrong. Currently you will see only packets that
> are sent to the interface. Promiscous mode is also interesting,
> but shouldn't have any importance in monitor mode, which the
> iwconfig manual describes as passing all packets on the frequency.
> 
> > Then I decided to start wpa_supplicant (this
> > is an FC6 box so it was service wpa_supplicant start) and I got this oops:
> > 
> > ...
> > EIP is at zd_mac_config_interface+0xc/0x35 [zd1211rw_mac80211]
> > ...
> 
> I believe Jon Smirl reported the same bug. But I didn't quite
> understand how to provoke it.

I think it's the NULL pointer dereference of the mac address pointer,
if there's only a monitor interface. The address pointer can be NULL.

-- 
Greetings Michael.