Accidentally changing permission of '/' directory to 'chmod 660 '

Question

After executing $ sudo chmod 660 /, I can't login with any of the users besides root. How can I restore the permissions ?

have you tried to change it back with `chmod 750 /` while being logged in as `root` ? — magor, Jun 01 '16 at 19:54
related: [wrongly set chmod 777 /](http://unix.stackexchange.com/questions/12998/wrongly-set-chmod-777-problems) — John Militer, Jun 01 '16 at 22:31

score 5 · Answer 1 · answered Jun 01 '16 at 19:59

5

As root

chmod 755 /

restores that to the default permissions. If you'd done

chmod -R 664 /

then you'd have to reinstall.

answered Jun 01 '16 at 19:59

Thomas Dickey

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even if you did `chmod -R 664 /` you could avoid the full re-installation,e.g. on rpm-based system you could verify the file modes with `rpm -V` – Serge Jun 01 '16 at 21:41
1

no - root wouldn't be able to log in. – Thomas Dickey Jun 01 '16 at 22:38

score 0 · Answer 2 · answered Jun 02 '16 at 10:27

Have you tried chkperm utility?

https://gitlab.com/chkperm/chkperm/wikis/home

I think you can use it on fresh linux installation to get the correct permission, then boot your server into recovery mode and use chkperm to fix these permissions to the original state.

Accidentally changing permission of '/' directory to 'chmod 660 '

2 Answers2