Security issue - storing NTACL's in non-NT-security-namespace

[Jeremy Allison]

On Fri, Dec 13, 2013 at 01:32:12PM -0800, L.A. Walsh wrote:
> Now NOTE: if I don't use "explicit action" (-a) in my copy:
> 
> Ishtar:law/Documents> /usr/bin/cp testfile.txt testcopy.txt
> Ishtar:law/Documents> attr -l testcopy.txt
> Attribute "SGI_ACL_FILE" has a 76 byte value for testcopy.txt
> 
> ONLY the root-namespace ACL is save  -- the user and security
> attributes are striped.

What is the namespace for SGI_ACL_FILE ?