Shmuel Metz (Seymour J.) wrote:

> Elardus Engelbrecht said:
>>I know Google is using a special hardened version of Linux system

>SEL, or beyond that?

It is not known. In 
http://www.google.com/about/datacenters/inside/data-security/index.html , 

look at Security White Paper. There is a PDF document which says on page 9:

<snippage>

Designed in-house from the ground up, Google’s production servers are based on 
a stripped and hardened version of Linux that has been customized to include 
only the components necessary to run Google applications, such as those 
services required to administer the system and serve user traffic. The system 
is designed for Google to be able to maintain control over the entire hardware 
and software stack and to help provide a secure application environment.
Google’s production servers are built on a standard hardened operating system 
(OS), and security fixes are uniformly deployed to the company’s entire 
infrastructure. This homogeneous environment is maintained by proprietary 
software that continually monitors systems for binary modifications. If a 
modification is found that differs from the standard Google image, the system 
is automatically returned to its official state. These automated, self-healing 
mechanisms are designed to enable Google to monitor and remediate destabilizing 
events, receive notifications about incidents, and slow down potential 
compromise on the network.

<end snippage>

This is apparently the most you will get from Google about their operating 
system(s).

Groete / Greetings
Elardus Engelbrecht

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