6431c34b8a
Unprivileged namespaces are only allowed if the "setgroups" file is set to "deny" for processes. And we need to write it before writing the gidmap. Hence add a parameter for that. Then, also patch all current users to actually enable this. The usecase generally don't need it (because they don't care about unprivileged userns), but it doesn't hurt to enable the concept anyway in all current users (none of them actually runs complex userspace in them, but they mostly use userns_acquire() for idmapped mounts and similar). Let's anyway make this option explicit in the function call, to indicate that the concept exists and is applied.
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