IV50927: CRASH DUE TO UDP_RECEIVE() INTERFACE CHANGE APPLIES TO AIX 6100-09

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A system may crash while accessing the data returned
  from the udp_receive() interface because the format of
  that data changed.
  .
  udp_receive() originally returned a pointer to an mbuf in its
  second argument, but was changed to return a pointer to an IP
  address as part of a performance enhancement.
  .
  Kernel extensions that hook into the AIX networking stack's
  protosw table for datagram sockets and intercept udp_receive()
  may expect the original data format and crash.
  .
  Specifically, this crash has been seen on systems using Symantec
  Critical System Protection (SCSP)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:
  * Systems running the 7100-03 Technology Level with the
  * bos.mp64 and bos.net.tcp.client filesets at the 7.1.3.15
  * levels.
  ****************************************************************
  * PROBLEM DESCRIPTION:
  * A system may crash while accessing the data returned
  * from the udp_receive() interface because the format of
  * that data changed.
  * .
  * udp_receive() originally returned a pointer to an mbuf in its
  * second argument, but was changed to return a pointer to an IP
  * address as part of a performance enhancement.
  * .
  * Kernel extensions that hook into the AIX networking stack's
  * protosw table for datagram sockets and intercept udp_receive()
  * may expect the original data format and crash.
  * .
  * Specifically, this crash has been seen on systems using Symant
  ****************************************************************
  * RECOMMENDATION:
  * Install APAR IV50927.
  ****************************************************************
  

Problem conclusion

• The udp_receive() interface will be restored back to its
  previous behavior by default, returning a pointer to an mbuf
  once again.
  .
  You can choose to enable the performance improvements
  which will change the data returned from udp_receive() to
  return a pointer to the IP address in the second argument.
  .
  This can be done by enabling a new network option,
  udp_recv_perf, using the 'no' command.
  

Temporary fix

• Prior to fix availability, some interim fixes are available
  from:
  ftp://public.dhe.ibm.com/aix/ifixes/iv50927/
  .
  If there is no ifix there for your level and you cannot
  update to the required level for the ifix, you can call
  IBM support to evaluate having a customer ifix built for
  your level.
  

Comments

• 6100-08 - use AIX APAR IV44968
  6100-09 - use AIX APAR IV50927
  6100-09 - use AIX APAR IV50927
  6100-09 - use AIX APAR IV50927
  6100-09 - use AIX APAR IV50927
  7100-02 - use AIX APAR IV46294
  7100-03 - use AIX APAR IV50987
  7100-03 - use AIX APAR IV50987
  7100-04 - use AIX APAR IV54555
  

APAR Information

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

  IV44968

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

Fix information

• Fixed component name

  AIX 610 STD EDI

• Fixed component ID

  5765G6200

Applicable component levels

• R610 PSY U866320

     UP14/05/21 I 1000