ModemManager and d-bus permissions in OpenWrt

Hugo Osvaldo Barrera hugo at
Tue Nov 22 20:13:32 UTC 2022

On Tue, 22 Nov 2022, at 20:48, Peter Naulls wrote:
> This is really an OpenWrt question, but I wanted to understand the specifics 
> with MM.  We're undergoing a security review, and it's been pointed out that
> d-bus runs as non-root. I've created a new "dbus" user and group like ubus
> has and have d-bus run under it as per its config file.
> Everything seems OK with MM, and indeed I think this is the only user of
> it under my OpenWrt setup, hence the question here.
> Is this likely to break anything?

ModemManager interacts with hardware drivers themselves, it needs some rather
elevated capabilities. A non-root user won't work immediately; you'd need to
make sure that the user can access all the lower layer in the hardware stack.

I wouldn't bet that this is currently possible.


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