main/udisks: mount USB flash memory as noexec
while we do have PaX protections, we shouldn’t strictly rely on them to keep us from being rooted.
consider a user, who has USB flash memory and shouldn’t really be using your computer. said user could insert USB dongle with precompiled statically linked exploit binary to possibly gain root without any other access by opening a terminal on the computer.
if we make the USB flash memory noexec, then this cannot happen.
(from redmine: issue id 845, created on 2011-12-01)