FTP Server Maintains D191 (Dummy) Link to Its Own 191 Minidisk

 
 APAR Identifier ...... PQ38736      Last Changed ........ 00/11/01
 FTP SERVER MAINTAINS D191 (DUMMY) LINK TO ITS OWN 191 MINIDISK
 
 Symptom ...... IN INCORROUT         Status ........... CLOSED  PER
 Severity ................... 3      Date Closed ......... 00/06/20
 Component .......... 5735FAL00      Duplicate of ........
 Reported Release ......... 320      Fixed Release ............ 999
 Component Name TCP/IP V2 FOR V      Special Notice
 Current Target Date ..              Flags
 SCP ...................
 Platform ............
 
 Status Detail: SHIPMENT - Packaged solution is available for
                           shipment.
 
 PE PTF List:
 
 PTF List:
 Release 320   : UQ44423 available 00/06/28 (0002 )
 
 Parent APAR:
 Child APAR list:
 
 ERROR DESCRIPTION:
 Customer is migrating to using TCP/IP FL320, and is using an
 OEM product to assist with moving various test disks to
 production use.  When an attempt was made to move the FTP
 server 191 minidisk, a message was received that indicated
 another user had a R/O link to this disk.  From a Q LINKS
 command, it was found that FTPSERVE itself had established a
 second link to its 191 disk, with address D191.  Customer
 anticipates this second and apparently unnecessary link will
 create problems as they convert the primary production system
 to VM/ESA 2.4.0 with TCPIP FL320, and whenever minidisk backups
 are performed.
 
 LOCAL FIX:
 None.
 
 PROBLEM SUMMARY:
 ****************************************************************
 * USERS AFFECTED: All customers that use the FTP server        *
 *                 (FTPSERVE) to provide access to data that    *
 *                 resides on a VM/ESA host.                    *
 ****************************************************************
 * PROBLEM DESCRIPTION: The VM/ESA server maintains a second    *
 *                      (dummy) link to its own 191 minidisk.   *
 *                      This can cause problems when system     *
 *                      management/backup operations are        *
 *                      performed.                              *
 ****************************************************************
 * RECOMMENDATION: APPLY PTF                                    *
 ****************************************************************
 As part of FTP server initialization processing, the server
 issues a DMSLINK call to link its own 191 minidisk with virtual
 address D191.  The return values from this call are examined to
 ensure the proper operating environment is present (with
 respect to CMS/CP levels) and to verify that the server has
 authorization to issue Diagnose code 88 and has privilege class
 B.  However, when this test succeeds, the second link to the
 191 minidisk (as D191) is maintained.  This unexpected,
 persistent link can create problems when system maintenance or
 backup activity is performed.
 
 PROBLEM CONCLUSION:
 Part FTSVMSUB has been modified to detach virtual address D191
 after it has been linked following the DMSLINK test call
 performed during server initialization.  In addition, the text
 for message FTSSUB003I (issued when the DMSCSL test call
 succeeds) has been modified.  The existing message text:
 
   FTSSUB003I Diagnose 88 is available for user authorization
              and minidisk links
 
 will now be issued as follows:
 
   FTSSUB003I Diagnose 88 authorization and Class B privilege
              confirmed
 
 The text change has been made to reduce confusion regarding
 access control in environments that make use of an External
 Security Manager (ESM).
 
 TEMPORARY FIX:
 
 COMMENTS:
 
 MODULES/MACROS:   FTSVMSUB MSFTP    SRVRFTP
 
 SRLS:      NONE
 
 RTN CODES:
 
 CIRCUMVENTION:
 
 MESSAGE TO SUBMITTER: