[Bug 120671] missing info about userns restrictions

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https://bugzilla.kernel.org/show_bug.cgi?id=120671

--- Comment #5 from Michał Zegan <webczat_200@xxxxxxxxxxxxxx> ---
yes, what I mean is just to make soe things more detailed in case someone
wonders.
About filesystes, you can try to test mounting an ext4 filesystem after doing
unshare of both userns and mountns, almost sure you will fail. I mean mounting
the fs from inside of the ns. I may test that too when I have time, to be sure,
but I am almost certain that is the case, especially that mounting an arbitrary
fs could be a security risk because uids are not shifted.

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