Re: unshare -m for non-root user

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Mike Frysinger wrote on 11/15/2015 07:28 AM:
On 15 Nov 2015 03:10, U.Mutlu wrote:
Mike Frysinger wrote on 11/15/2015 02:24 AM:
On 15 Nov 2015 01:49, U.Mutlu wrote:
So, then the question remains: how to give non-root user a secure mount

no, it doesn't.  at least two people have already told you how to do it:
use the usernamespace (-U) option that unshare already supports.

It's not yet clear for me how to use that. Can you give an example?
unshare -U /bin/bash

the unshare(1) man page already includes an example:
$ unshare --map-root-user --user sh -c whoami
root

No, firstly there is no such example in man unshare, secondly it doesn't do here:
$ unshare --map-root-user --user sh -c whoami
unshare: unshare failed: Operation not permitted

Is there maybe a bug in the Debian version?
$ unshare --version
unshare from util-linux 2.25.2

And thirdly: is that not even more dangerous to give a user root permission then? I don't understand this philosophy. Or, where is the trick in this?



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