IBM Support

MF54855 - LIC-COMM-TCPIP TCP may overwrite data with TCP header

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

LIC-COMM-TCPIP TCP may overwrite data with TCP header


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  NUMBER   MIN/MAX  OPTION
---- -------- ---  -------  -------  ------
CO   5770999  710  MF49821   00/00    0000



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
In rare cases, TCP/IP may write the TCP header of a packet over
user data causing data corruption that may or may not be
detected.

CORRECTION FOR APAR MA41722 :
-----------------------------
TCP attempts to prepend its headers to the user data buffer when
it can safely do so without overwriting data, however in one
case it used the user buffer when it should instead have
allocated a separate buffer for the TCP and IP headers. TCP will
now correctly allocate a separate buffer in this case,
preventing any data overwrite.

CIRCUMVENTION FOR APAR MA41722 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF54804      LIC-COMM-TCPIP-WAIT APPLICATION DATA GIVEN TO TCP IN SEPARAT
   MF53300      Integrity Problem
   MF53222      TCPIP TCP WINDOW SCALING
   MF53222      LIC-COMM-TCPIP-UNPRED NO NEW SERVER (TELNET) CONNECTIONS
   MF52893      LIC-COMM-TCPIP-CFG new ipconfig macro options
   MF52348      TCPIP-OTHER-INCORROUT IDS ACKSTORM EVENT GENERATED BY TCP/IP
   MF48598      LIC-COMM-TCPIP Transport Fixes
   MF50394      LIC-COMM-TCPIP-UNPRED RETRANSMISSION TIMER HIGH
   MF49877      LIC-COMM-TCPIP TCP Buffer Copy Prevention

Summary Information

System..............................i
Models..............................
Release.............................V7R1M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA41722
Superseded by:......................View fix details for PTF MF99011
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C2115710


System i Support

IBM disclaims all warranties, whether express or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. By furnishing this document, IBM grants no licenses to any related patents or copyrights. Copyright © 1996,1997,1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 IBM Corporation. Any trademarks and product or brand names referenced in this document are the property of their respective owners. Consult the Terms of use link for trademark information.

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG15V","label":"PTF Cover Letters - OS\/400 General"},"Component":"","ARM Category":[],"Platform":[{"code":"PF012","label":"IBM i"}],"Version":"V7R1M0","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG16D","label":"PTF Cover Letters - IBM i 7.1 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF012","label":"IBM i"}],"Version":"V7R1M0","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
13 January 2012