I use Kali Linux and discovered the following "problem":
root@kali:/proc/self# ls -l cmdline
-r--r--r-- l root root 0 May 27 13:43 cmdline
root@kali:/proc/self# chmod 744 cmdline
chmod: changing permissions of `cmdline': Operation not permitted
I am not allowed to change the permissions of that file... but I am root? Why is that? Are there ways to work around this? I allready tried some things like moving the file (what is obviously not possible), change the runlevel etc.