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MF68097 - LIC MITIGATE POWER9 L1 CACHE VULNERABILITY

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

LIC MITIGATE POWER9 L1 CACHE VULNERABILITY


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
TR   5770999  V7R2M0    MF99109   00/00    0000
CO   5770999  V7R2M0    MF68096   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

-----------------------------------------------
Vulnerability CVE-2020-4788 in the IBM POWER9 processor
affects IBM i on IBM Power Systems with POWER9 technology.

Vulnerability Details:
CVEID: CVE-2020-4788
DESCRIPTION: IBM Power9 processors could allow a local user
to obtain sensitive information from the data in the L1 cache
under extenuating circumstances.
CVSS Base score: 5.1
CVSS Temporal Score:
See: https://exchange.xforce.ibmcloud.com/vulnerabilities/189296
for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

CORRECTION FOR APAR MA48752 :
-----------------------------
Vulnerability CVE-2020-4788 is mitigated by applying this PTF.

CIRCUMVENTION FOR APAR MA48752 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


********************************************************************
THE FOLLOWING ARE SUPERSEDED SPECIAL INSTRUCTIONS. IF THE SUPERSEDED
PTF HAS ALREADY BEEN APPLIED AND ITS SPECIAL INSTRUCTION FOLLOWED,
IT IS NOT NECESSARY TO FOLLOW THAT SPECIAL INSTRUCTION AGAIN.
********************************************************************

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF68028 :
=================================================

This PTF can be loaded and applied independently from Power FW
fixes that have been created to address the Spectre and Meltdown
vulnerabilities, but both IBM i PTFs and available Power FW fixes
are required to mitigate vulnerabilities.


Default Instructions

THIS IS A DELAYED PTF TO BE APPLIED AT IPL TIME.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF68028      LIC-PERFM DISPATCHER HOT CACHE LINE IMPACTS PERFORMANCE SCAL
   MF66135      LIC-OTHER-WAIT SYSTEM HANG DUE TO WORKLOAD CAPPING
   MF66707      LIC-OTHER-LOOP DLPAR OPERATION CAUSES LOOP
   MF65643      LIC-UNPRED LARGE PROCESSOR DLPAR REQUEST FAILS
   MF65315      LIC-OTHER Enablement for future function
   MF64552      LIC MITIGATE SPECTRE AND MELTDOWN VULNERABILITY
   MF65235      LIC-OTHER-INCORROUT Prerequisite for APAR MA47228
   MF65232      LIC MITIGATE SPECTRE AND MELTDOWN VULNERABILITIES

Summary Information

System..............................i
Models..............................
Release.............................V7R2M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA48752
Superseded by:......................
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C1084720


IBM i Support

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Document Information

Modified date:
17 April 2021