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

Christopher J. PeBenito cpebenito at tresys.com
Tue Sep 27 08:17:56 CDT 2011

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.

Chris PeBenito
Tresys Technology, LLC
www.tresys.com | oss.tresys.com

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