The underlying bug is that, in slip.c, slip_down() has no idea whether the user is actually allowed to take down the specified interface.
I'm thinking the proper fix would be to send the open fd to uml_net just like when it was upped (if you can open it, you own it). The line discipline on the fd can be checked with ioctl TIOCGETD if it's N_SLIP, but I'm not sure the interface name can be recovered from the fd. The tty ioctl TIOCSETD in the kernel looks like it returns two different values: either the dev index if the slip line is new (useful), or 0 if it has already been set (not useful).
Steve Schmidtke
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