Description Michael Grandjean 2014-11-14 16:51:00 CET

When plugging in a USB pendrive the partitions are mounted to /run/drives and then shown in drive Z: in the remote session:

> root@ucc-veriton:~# ls -l /run/drives/
> insgesamt 4
> drwxr-xr-x 2 root root   40 Nov 14 16:27 usbdisk-sdb
> drwxrwxrwx 1 root root 4096 Nov 14 16:27 usbdisk-sdb1

If one unplugs the USB pendrive, sdb1 is removed, but sdb is not:

root@ucc-veriton:~# ls -l /run/drives/
insgesamt 0
drwxr-xr-x 2 root root 40 Nov 14 16:27 usbdisk-sdb

Thus, sdb is also still visible in the remote session, although the pendrive is not available anymore (see attached screenshot).

I don't see the necessity to mount sdb in the first place: it's always empty and the needed data partitions are always followed by a digit (e.g. sdb1). 

For a customer I adapted the blacklisting for ram and loop devices to also blacklist exact matches of 'sda', 'sdb', 'sdc' ... (Ticket#2014110321000159)

I have seen this in Citrix XenApp sessions where sdb doesn't seem to disappear at all and in RDP sessions, where sdb disappeared after a couple if minutes. 
I used at least two different USB pen drives and different combinations of fat32, ntfs, formatted with gparted and formatted with windows.