> I suspect if you put the same number of people at z/OS as anything else
> they would find lots of holes in it.

I suspect you wouldn't.

> z/OS is secure because nobody cares about it. It only takes one person
> to care enough.

z/OS is secure because it has been IBM's officially stated policy ever since OS/VS2 
Version 2
first shipped that all APARs describing integrity exposures would be unconditionally 
accepted:

MVS B1 SUPPORT:  Selected MVS/ESA products, collectively called a
trusted computing base (TCB), were evaluated by the United States
Department of Defense's National Computer Security Center (NCSC),
found to meet the criteria for a B1 level of trusted system, and
posted on the Evaluated Product List in September 1990.  The
following products, along with specific service, were evaluated in 1990:
           o   MVS/SP-JES2 Version 3 Release 1.3
           o   MVS/SP-JES3 Version 3 Release 1.3
           o   MVS/DFP Version 3 Release 1.1
           o   ACF/VTAM Version 3 Release 3
           o   TSO/E Version 2 Release 1.1
           o   RACF Version 1 Release 9
           o   PSF/MVS Version 1 Release 3
For more information on the IBM MVS/ESA JES2 and JES3
Security System Packages, refer to Software Announcement 290-497,
MVS/ESA PLANNING: B1 SECURITY  for MVS/SP Version 3 (GC28-1800),
or contact your IBM representative.

--
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803

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