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Security update for Linux kernel (k_timer)


(Last modified: 08JUL2002)

solutions Security update for Linux kernel (k_timer) SuSE Linux Maintenance Web (9fb366cce01a8579a465e6c68a41a0f8)

Applies to

Product(s): SuSE Linux Enterprise Server 7 for S/390 and zSeries

Package: k_timer
Release: 20020708
Obsoletes: none


Everyone should install this update.


VM not updated to latest APARs.

Problem description

This Kernel contains fixes for the following problems:
  • fix for ip_conntrack security problem
  • fix for TCP RST handling in listen: Linux would previously accept SYN packets with a RST or FIN bit set. This could be used to circumvent some packet filters who assume that these packets cannot open a new connection
  • fix for possibly incorrect TLB flushing under extreme circumstances
  • fix for SMP race in msgrcv(can trigger only with extensive IPC usage)
  • fix for SMP race in locking code of the NFS client
  • fix for CTC not restarting after I/O errors
  • fix for initialisation problems in the dasd discipline drivers
  • update to IBM Code Drop 2002-11-25 which fixes these problems:
    • Linux hangs after a device is gone
    • Linux hangs after a tape attach or attached tape is not recognized
    • Linux fails to detect devices after 'not operational' messages
    • fix for initialisation problems when bringing up IUCV connections
This Kernel includes OCO Modules from IBM which have been updated to the 2002-08-16 (Aug16 2002) drop. These modules are required for using Hipersockets under z/VM 4.3.


Please install the updates provided at the location noted below
For detailed information about the required APARs / PTFs, please refer to the "OSA-Express QDIO performance enhanced in consolidated Linux under z/VM environments" document at

Installation notes

This update is provided as an RPM package that can easily be installed onto a running system by using this command:
rpm -Uvh k_timer.rpm zipl
Now shutdown the Linux system with:
shutdown -h now
(substitute "now" with an appropriate amount of time if you want to give local users a chance to log out before the Linux system goes down.)
After the system has shut down, re-IPL.

links to download packages

Download Source Packages

Download the source code of the patches for maintained products.


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