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IV50987: CRASH DUE TO UDP_RECEIVE() INTERFACE CHANGE APPLIES TO AIX 7100-03

A fix is available

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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 IV50987.
    ****************************************************************
    

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/iv50987/
    .
    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 number

    IV50987

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    NoHIPER

  • Submitted date

    2013-10-16

  • Closed date

    2013-10-31

  • Last modified date

    2016-05-10

  • 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 V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U866417

       UP14/05/22 I 1000



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV50987

Modified date: 10 May 2016