[CentOS] Giving full administrator privileges through sudo on production systems

Thu Aug 29 15:25:50 UTC 2019
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On 2019-08-17 08:42, Jonathan Billings wrote:
> On Aug 17, 2019, at 9:25 AM, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote:
>> I like this one. Long-long ago it was one of the “tricky” questions at the UNIX admin test (exam). Basically, no matter how devastating that may sound, the command only will remove what is (alphabetically it was that time) before /dev/[root_device]. Once the device root filesystem lives on is removed from /dev, no further damage is done. So, you will be able to mount drive on another machine and get your /etc, /home, /var, /usr/local intact ;-) Asking that question other people gave me (an them usually) a lot of fun.
> I’m not sure what UNIX systems where that’d actually happen, but on Linux systems, removing the device in /dev/ would not deter rm from being able to delete everything else on the mounted filesystems.
> Certainly if you were using some sort of automount system, and the filesystems hadn’t unmounted, it would be fine.

Thanks, everybody, for confirming that on Linux

rm -rf /

does lead to devastating result. Just for fun I tried the same on 
FreeBSD (12.0 RELEASE - which is latest release):

root at point:/home/valeri # cd
root at point:~ # whoami
root at point:~ # rm -rf /
rm: "/" may not be removed

Somebody is really clever in this World ;-) Well, FreeBSD folks made my 
day (again!). Note, that that I did on my live workstation (yes, I did 
test it on throw-away system first ;-) - so I can copy and paste what I 
got to this email.


> --
> Jonathan Billings <billings at negate.org>
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247