Já tentou configurá-lo via /etc/sudoers
? Como por sudoers(5)
:
umask_override If set, sudo will set the umask as specified by sudoers
without modification. This makes it possible to
specify a more permissive umask in sudoers than the
user's own umask and matches historical behavior. If
umask_override is not set, sudo will set the umask to
be the union of the user's umask and what is specified
in sudoers. This flag is off by default.