kernel-packages team mailing list archive

[Shaun Turnbull <1025467@xxxxxxxxxxxxxxxxxx>]

Apologies once again. Now understand S U B are only sysrq commands
allowed by default by the use of bitmask 176 which for it is easy to
change or adapt relevant settings to any other commands as needed or
desired. This for me is applicable to 12.10 and 13.04 desktop amd64.
Suprisingly very little information regarding sysrq in Official Ubuntu
Documentation.  Have posted an answer with much useful information
regarding the use and configuration of sysrq in the link posted in last
comment.  The majority of the answer is copied from another ditrubitions
wiki which is based on the Linux Kernel Documentation regarding sysrq.
The conclusion to the answer in linked Ask Ubuntu question above is to
leave the default settings as is unless there is obvious need to do
otherwise.  Just use SUB instead of RSEIUB!  Tryng sysrq commands in tty
will give text output which helps understand and prove there never was a
complete disabling of sysrq.  Have taken back my affected vote as a
little research has proven i am unaffected. Another example of how Ask
Ubuntu is a brilliant learning tool and just one of the many brilliant
resources available through using Ubuntu!  Links provided by mniess in
other answer to the same question are key in understanding and
appreciating why the need for different bitmask has come about and this
is not a new concept.

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https://bugs.launchpad.net/bugs/1025467

Title:
  sysrq is now completely disabled, it would be nice to maintain the
  ability to reboot etc

Status in “linux” package in Ubuntu:
  In Progress
Status in “procps” package in Ubuntu:
  Fix Released

Bug description:
  In fixing Bug #194676 all of the sysrq functionality was disabled.
  Some options are of low security impact but aid debugabilty of
  systems.  It would be good to reenable what we can.  See the original
  bug for suggested values in use by other distros.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: procps 1:3.3.3-2ubuntu2
  ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6
  Uname: Linux 3.5.0-4-generic i686
  ApportVersion: 2.3-0ubuntu4
  Architecture: i386
  Date: Mon Jul 16 23:13:10 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  SourcePackage: procps
  UpgradeStatus: Upgraded to quantal on 2012-01-04 (194 days ago)

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