BIND 10 #268: review: setuid via -u on b10-auth

[BIND 10 Development]

#268: review: setuid via -u on b10-auth
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      Reporter:  shane        |        Owner:  jelte                      
          Type:  enhancement  |       Status:  reviewing                  
      Priority:  major        |    Milestone:  06. 4th Incremental Release
     Component:  b10-auth     |   Resolution:                             
      Keywords:               |    Sensitive:  0                          
Estimatedhours:  0.0          |        Hours:  0                          
      Billable:  1            |   Totalhours:  1.0                        
      Internal:  0            |  
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Comment(by jinmei):

 Replying to [comment:14 jelte]:
 > Well the old trick for getting a second superuser account is to set its
 uid to 0. Don't know if it's in the standards (i suspect they left
 specifying that out on purpose), and I *think* that having a second uid=0
 account and then asking for its username will return root again, so in
 practice I don't think it really matters, but i believe that that is the
 check the system actually makes (unless there are capabilities or other
 such modern nonsense)
 >
 I've changed the check to uid==0 (r2670).

 I've googled on whether it's specified in some standard or just a
 convention, but couldn't find an answer.  But at least uid==0 wouldn't be
 worse than username="root", and probably a bit more portable.

 Is it now okay to merge?

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Ticket URL: <https://bind10.isc.org/ticket/268#comment:15>
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