[refpolicy] what is a suitable type for /dev/cdc-wdm[01]

Dominick Grift dominick.grift at gmail.com
Tue Sep 27 10:49:32 CDT 2011


On Tue, 2011-09-27 at 09:17 -0400, Christopher J. PeBenito wrote:
> On 09/26/11 06:27, Dominick Grift wrote:
> > /dev/cdc-wdm[01] character device nodes are currently labeled type
> > device_t:
> > 
> >> # matchpathcon /dev/cdc-wdm0
> >> /dev/cdc-wdm0	system_u:object_r:device_t:s0
> > 
> > what would be suitable type for these devices?
> > 
> >> CDC Device Management (2 "devices") 
> >>  CDC Mobile Direct Line (1 "device") 
> >>
> >> The first is supported by the cdc-wdm driver available in 2.6.29 
> >> (haven't checked exactly when it was added, but it is rather new).
> >>  It 
> >> will add two new devices you can send AT commands
> >> to /dev/cdc-wdm[01], 
> >> but not do any high speed data transfers over.  Quite useful, since
> >> the 
> >> three ACM devices are easily "lost" to GPS, SMS daemon and PPP. 
> 
> I'm not sure, possibly modem_device_t or a new type.
> 
> >> The CDC Mobile Direct Line is actually a masqueraded CDC Ethernet 
> 
> If this is a different device node then this probably should be a new type.
> 
> >> device. Ericsson has provided a driver which is mostly a copy of 
> >> cdc_ether.c.  Nice feature to have, but I've not been able to measure 
> >> any speed advantages compared to PPP on ttyACM0.  Still, fun to play 
> >> with :-)
> >
> > Also, why are ACM tty character device nodes labeled type tty_device_t
> > and not for example acmtty_device_t?
> 
> It would seem that modem_device_t would be a better choice, assuming all ttyACM* devices are cellular modems.
> 

From what i am reading these ttyACM character device nodes are "USB
virtual serial ports"

On my system they are used for sms gps and ppp but i am not sure if that
makes modem_device_t a suitable type for these.

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