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On 2016-07-31 13:45, Andrew David Wong wrote:
> On 2016-07-31 13:42, Andrew David Wong wrote:
>> On 2016-07-31 13:38, Marek Marczykowski-Górecki wrote:
>>> On Sun, Jul 31, 2016 at 01:30:42PM -0700, Andrew David Wong wrote:
>>>> On 2016-07-31 10:41, donoban wrote:
>>>>> On 07/30/2016 11:52 PM, Marek Marczykowski-Górecki wrote:
>>>>>> On Sat, Jul 30, 2016 at 02:44:24PM -0700, tel wrote:
>>>>>>> Sorry for the delay, Chris. I was waiting for 3.2-rc2, which I
>>>>>>>  just installed. It seems to come with the latest AEM package,
>>>>>>> so I didn't have to install that package myself.
>>>>> 
>>>>>>> I added the parameter to the tboot line. It didn't reboot, but 
>>>>>>> it hung before asking for the password with "Waiting for 
>>>>>>> /dev/disk/by-label/aem* to be connected..."
>>>>> 
>>>>>>> Not sure where to go from here.
>>>>> 
>>>>>> Do you use also USB VM? In that case, dom0 has no access to USB 
>>>>>> controllers...
>>>>> 
>>>>>> But you can re-enable it just for boot time by editing 
>>>>>> /etc/default/grub and removing the line with "hide_all_usb" (or 
>>>>>> just comment it out). Then rerun `grub2-mkconfig -o 
>>>>>> /boot/grub2/grub.cfg`. It will expose dom0 for all connected USB 
>>>>>> devices for a short time during system startup.
>>>>> 
>>>>> 
>>>>> 
>>>>> Nice, this should be added to: 
>>>>> https://www.qubes-os.org/doc/usb/#tocAnchor-1-1-4
>>>>> 
>>>>> With some warning: "Caution! Enabling usb-vm with LUKS encryption
>>>>> and a USB keyboard could stop you from booting your system"
>>>>> 
>>>>> :)
>>>>> 
> 
>>>> If a USB keyboard is detected, the installer does not allow the
>>>> option of creating a USB qube, so it should not be possible for a
>>>> user to accidentally get him- or herself into this predicament.
> 
>>> But using USB qube will not stop you from creating AEM usb stick (or
>>> the other way around).
> 
> 
>> So, the problem is that if rd.qubes.hide_all_usb is added to grub.cfg
>> when the USB qube is created, but the user later decides to create an AEM
>> USB stick, then the user must be told to remove rd.qubes.hide_all_usb, or
>> else it will not work. Is that correct?
> 
> 
> (And, as you said, the converse: If a user creates an AEM USB stick, then 
> later decides to create a USB qube, they should be warned not to add 
> rd.qubes.hide_all_usb to grub.cfg.)
> 

Ok, added a new section to the USB documentation explaining hiding USB devices
from dom0:

https://github.com/QubesOS/qubes-doc/commit/15d418b778a8879323091c79fdc1084d
ecb890cb

And a pull request to the AEM README with a warning about using an AEM USB
device with a USB qube:

https://github.com/QubesOS/qubes-antievilmaid/pull/15

- -- 
Andrew David Wong (Axon)
Community Manager, Qubes OS
https://www.qubes-os.org
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