cmu-runner can't determine whether the device(s) referred to in XCOPY
    Copy Source/Copy Destination (CSCD) descriptors should be accessible to
    the initiator via transport settings, ACLs, etc. Consequently, fail
    XCOPY requests with CSCD descriptors which refer to any device other
    than where the XCOPY request is processed.
    
    Fixes  CVE-2020-28374