trunk:
    The attached patch allows unprivileged clients to export from or import
    to the largeobject owned by themselves.
    
    The current security policy does not allow them to import/export any
    largeobjects without any clear reason.
    
    NOTE: Export of the largeobject means that it dumps whole of the
    largeobject into a local file, so SE-PostgreSQL checks both of
    db_blob:{read export} on the largeobject and file:{write} on the
    local file. Import is a reversal behavior.
    
    KaiGai Kohei