IC81809: Java application using C security exit that modifies ExitReason crashes

WebSphere MQ V7.0 Fix Pack 7.0.1.9
Fix Pack 7.1.0.2 for WebSphere MQ V7.1

APAR status

• Closed as program error.

Error description

• A Java application connects as a client to a queue manager
  using a channel that is configured to use a security exit
  written in C. During the time that the application is
  connecting, the Java application crashes.
  
  MQ Explorer can crash in this way if channels that it connects
  to are configured to use security exits written in C.
  
  The failing Java application may produce a Java core file
  containing the following function on the stack:
  
  com/ibm/mq/jmqi/remote/exit/NativeExitDefinition.jniCallExit
  (NativeMethod)
  

Local fix

• WMQ was not tolerant to a C channel exit changing the ExitReason
  code in the MQCXP structure passed to it within a Java
  process. L3 has changed the MQ code to be more robust to the
  exit changing the value of the ExitReason field.
  
  ===============================================================
  
  iFix provided by L3:
  7.1.0.0-WS-MQ-Windows-TFP79410
  http://l3.hursley.ibm.com/cgi-bin/ViewPRB.pl?5270
  
  ===============================================================
  
  As a workaround customer could try changing their security exit
  to keep the ExitReason as an input only field to see if this
  fixes their problem.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of Java applications that connect to channels configured
  to use security exits written in C that modify the ExitReason
  field of the MQCXP structure passed to the exit.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows) +Java
  ****************************************************************
  PROBLEM SUMMARY:
  The ExitReason field of the MQCXP structure passed to security
  exits is input only. Therefore the WebSphere MQ Java classes
  that call out to the security exit written in C assumed that the
  ExitReason would not be changed by the exit. If the exit does
  change the ExitReason field then on return from the exit that MQ
  Java classes access invalid data, causing the Java application
  to crash.
  

Problem conclusion

• The MQ Java classes have now been modified not to assume that
  the ExitReason field will not be changed by a security exit.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.9
  --------           --------------------
  Windows            U200337
  AIX                U849391
  HP-UX (PA-RISC)    U849723
  HP-UX (Itanium)    U849728
  Solaris (SPARC)    U849724
  Solaris (x86-64)   U849730
  iSeries            7.0.1.9
  Linux (x86)        U849725
  Linux (x86-64)     U849729
  Linux (zSeries)    U849726
  Linux (Power)      U849727
  
                     v7.1
  Platform           Fix Pack 7.1.0.2
  --------           --------------------
  Windows            7.1.0.2
  AIX                7.1.0.2
  HP-UX (Itanium)    7.1.0.2
  Solaris (SPARC)    7.1.0.2
  Solaris (x86-64)   7.1.0.2
  iSeries            7.1.0.2
  Linux (x86)        7.1.0.2
  Linux (x86-64)     7.1.0.2
  Linux (zSeries)    7.1.0.2
  Linux (Power)      7.1.0.2
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WMQ WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R700 PSY

     UP