Red Hat Bugzilla – Bug 474660
[LTC 5.5 FEAT] Enhanced Linux System Layout for System z 
Last modified: 2009-08-03 07:00:32 EDT
Emily J. Ratliff <email@example.com> -
1. Feature Overview:
Feature Id: 
a. Name of Feature: Linux on System z: Enhanced Linux System Layout
b. Feature Description
Execute the user program in secondary space mode (executable comes through primary space while data
is accessed through the secondary space). Add a second paging table for data access. This enables
the kernel to map executable code to primary space only. The kernel itself will operate in home
2. Feature Details:
Arch Specificity: Both
Affects Core Kernel: Yes
Delivery Mechanism: Backport
Request Type: Kernel - Enhancement from IBM
d. Upstream Acceptance: Accepted
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: IBM code
g. Component Version Target: 2.6.21
3. Business Case
Enhanced Security: protection against buffer overwrite exploits.
The item introduces a secure Linux system that is protected against stack overwrites, e.g.
delivering a system that is insensitive against buffer exploits (security!).
4. Primary contact at Red Hat:
5. Primary contacts at Partner:
Project Management Contact:
Hans-Georg Markgraf, firstname.lastname@example.org, Boeblingen 49-7031-16-3978
Gonzalo Muelas Serrano, email@example.com
Thomas Schwarz, firstname.lastname@example.org
IBM is signed up to test and provide feedback.
As discussed in yesterdays call, this feature request need to be deferred to RHEL 5.5.
John plans to open a RHEL 5.5 Tracker BZ and connect that to this feature BZ to use this request for RHEL 5.5
I set this to defer for now, to re-open for RHEL 5.5 feature submission
Closing as DEFERRED based on comment 2
------- Comment From email@example.com 2009-08-03 06:58 EDT-------
IBM not pursue this with RHEL 5 stream.
Closing feature request