You can check you Selinux status in settings - About phone
You can set the SELinux to Permissive temporarily by running the bellow two commands in Terminal emulator
But it SElinux will change to default once you hard reboot your phone.. In order to keep it in permissive, you need to soft reboot always whenever reboot needed and it's quite annoying..
So I found a workaround to Set the SELinux to permissive on boot itself.
For this you need to have init.d support.. If you don't have just install it via universal init.d tool available in xda.. (just do a search, u will get it) install universal init.d and activate init.d..
Then go to /etc/init.d directory, create a file and rename it as "08setperm" (without quotes) and add the below lines in the file and save it..
And give full permission (rwxrwxrwx) .. Use root Explorer to edit and give permissions..
Now hard reboot your phone and you can see SELinux is set to "permissive" on boot itself..
Now install Xposed framework by following the steps mentioned in the official xposed thread..
This method is tested in moto G and working fine for me... I'm not responsible for anything if happened with your mobile after trying this..
Ps: if you flash any new nightly or new rom, you need to add the file in to init.d directory again..
I posted this using my mobile. So pardon me if any formatting issues..
Hit thanks if i helped you..