IJ36208: KEYTAB IMPLEMENTATION IS NOT THREAD-SAFE

APAR status

• Closed as program error.

Error description

• Error Message: KeyTab: exception Keytab is corrupted
  .
  Stack Trace: N/A
  .
  

Local fix

• N/A
  

Problem summary

• There is the possibility of in-memory Kerberos keytab parsing
  errors due to a multi-threading race condition
  during KeyTab class instantiation.
  

Problem conclusion

• Added a "synchronized" modifier to the KeyTab.getInstance()
  method to eliminate the multi-threading race
  condition during Kerberos keytab class instantiation.
  The files affected by this APAR are: ibmjgssprovider.jar (Java 7
  & 7.1: build_20211118--134, Java 8: build_20211118--133).
  The associated Hursley RTC Problem Report is: PR146658.
  The associated Austin Git issue is: Issue #40 for JGSS.
  The associated Austin APAR issue is: N/A.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR7 FP5   (8.0.7.5)
     7 R1 SR5 FP5   (7.1.5.5)
     7    SR11 FP5  (7.0.11.5)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

  SECURITY

• Fixed component ID

  620700125

Applicable component levels