[uml-user] my uml kernel config breaks TUN/TAP

[<li...@re...>]

Hi,

I recently built a UML binary based on 2.4.24 off of kernel.org. My new
kernel starts up fine, but when I start up eth0, I get:

# ifup eth0
SIOCSIFFLAGS: Operation not permitted
SIOCSIFFLAGS: Operation not permitted

and dmesg says:

execvp of 'uml_net' failed - errno = 2
execvp of 'uml_net' failed - errno = 2
read_output - read of length failed, err = 0
execvp of 'uml_net' failed - errno = 2
eration not permitted
execvp of 'uml_net' failed - errno = 2
read_output - read of length failed, err = 0

Before I built this kernel, I was using the UML binary available in
Debian/Stable. Starting a UML session with that binary works fine on the
same root_fs and with the same boot options, and I can bring up the
interface with no trouble. So, I think there has to be something wrong
with how I'm choosing my kernel config options. I've attached my kernel
config; can anyone give me a hint what I might be screwing up?

Thanks!