7. Mar 2018 11:27 by to...@tuxteam.de: > I can't reproduce, either. Once the chown to root happens, non-root > user can't touch files in directory. Ext4.
I double checked. Sorry the previous example was not good. To reproduce the issue, you have to create another directory inside the top one. Here is a working example: # terminal A su mkdir /opt/experiment/ chown aristo:aristo /opt/experiment mkdir /opt/experiment/apple chown aristo:aristo /opt/experiment/apple # terminal B, whoami # aristo cd /opt/experiment/apple touch aaa # OK # terminal A chown root:root /opt/experiment chmod 700 /opt/experiment # terminal B pwd # Gives /opt/experiment/apple touch bbb # OK bbb is created cd /opt/experiment/apple # Gives permission denied # new terminal C cd /opt/experiment/apple # Denied touch /opt/experiment/apple/ccc # Denied Note that, after chmod 700, in terminal B you can still create files, although you cannot cd into apple.
