Re: Issue with clone() and CLONE_NEWUSER as unprivileged user

[Marcel Holtmann]

Hi Andy,

>> I am trying to use clone() and CLONE_NEWUSER for creating a new user namespace as an unprivileged user. I always get an operation not permitted error. However when I used fork() + unshare() as unprivileged user, I can create the new user namespace just fine.
>> 
>> Is there something obvious that I am missing? My understand is that CLONE_NEWUSER should not require any special capabilities. I tried the sample code from the manpage and also from LWN.net, but both give me the same error.
> 
> It works for me on 3.16 and 3.15 but not on 3.15.8-200.fc20.x86_64.  I'm
> a bit confused.  What kernel are you using?

I am running 3.15.6-200.fc20.x86_64 actually. What confused me is that fork() + unshare() works fine, but clone() doesn't.

Regards

Marcel

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