Mount /lib/modules via COW for StandaloneVM

[marmarek]

Reported by joanna on 16 Aug 2011 11:16 UTC
Currently /lib/modules is mounted as R/O. This is problematic in the following scenario:

A user creates a "wififun" Standalone VM to which she delegates one or more WiFi devices. Then, to get the actual "fun" out of this setup, she wants to use "injection", so she must patch some of the WiFi kernel modules. This is normally done by downloading the bleeding edge compat-wireless package, applying some patches from aircrack-ng, and then doing make && make install that copies the new modules into /lib/modules/XXX/. Obviously this won't work in our setup. A temp workaround is to do umount /lib/modules and then do make install. But this requires doing umount on each VM start, and the reload of all the WiFi stack modules.

It should be simple to backup /lib/modules device with a CoW (perhaps located on the same device where we keep swap and root cow?). This would also be more in-line with the philosophy of the Standalone VM -- i.e. that the fs modifications aree persistent.

Migrated-From: https://wiki.qubes-os.org/ticket/333

[marmarek]

Comment by marmarek on 3 Sep 2011 14:54 UTC
http://git.qubes-os.org/gitweb/?p=marmarek/core.git;a=commit;h=ac917ef1d82341608b4750ada6bdb43a7cc98282

[marmarek]

Comment by marmarek on 3 Sep 2011 14:54 UTC
http://git.qubes-os.org/gitweb/?p=marmarek/core.git;a=commit;h=ac917ef1d82341608b4750ada6bdb43a7cc98282