Am 04.04.2016 um 04:54 schrieb fsmithred:
>    session optional pam_umask.so umask=0022"
Add such customization to
    /etc/pam.d/common-session
instead. The statement should appear after the end of the block that is 
automatically updated by "pam-auth-update", i.e. it should follow the line
    # end of pam-auth-update config
I tested the statement
    session optional pam_umask.so umask=0027
and it gives me the expected result.
See /etc/pam.d/common-session and pam-auth-update(8) for more details.
Kind regards,
T.