/usr/share/idl/tao/PortableServer/ is in libtao-dev 6.0.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/idl/tao/PortableServer/AdapterActivator.pidl
/usr/share/idl/tao/PortableServer/ForwardRequest.pidl
/usr/share/idl/tao/PortableServer/IdAssignmentPolicy.pidl
/usr/share/idl/tao/PortableServer/IdUniquenessPolicy.pidl
/usr/share/idl/tao/PortableServer/ImplicitActivationPolicy.pidl
/usr/share/idl/tao/PortableServer/LifespanPolicy.pidl
/usr/share/idl/tao/PortableServer/POA.pidl
/usr/share/idl/tao/PortableServer/POAManager.pidl
/usr/share/idl/tao/PortableServer/POAManagerFactory.pidl
/usr/share/idl/tao/PortableServer/PS_Current.pidl
/usr/share/idl/tao/PortableServer/PS_Forward.pidl
/usr/share/idl/tao/PortableServer/PortableServer.pidl
/usr/share/idl/tao/PortableServer/PortableServer_include.pidl
/usr/share/idl/tao/PortableServer/RequestProcessingPolicy.pidl
/usr/share/idl/tao/PortableServer/ServantActivator.pidl
/usr/share/idl/tao/PortableServer/ServantLocator.pidl
/usr/share/idl/tao/PortableServer/ServantManager.pidl
/usr/share/idl/tao/PortableServer/ServantRetentionPolicy.pidl
/usr/share/idl/tao/PortableServer/ThreadPolicy.pidl