#2527 NORM Trial-3: Rainbow needs to robustly de-allocate resources

[Zarro Boogs per Child]

#2527: Rainbow needs to robustly de-allocate resources
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 Reporter:  mstone    |       Owner:  mstone            
     Type:  defect    |      Status:  new               
 Priority:  normal    |   Milestone:  Trial-3           
Component:  security  |     Version:  Git as of bug date
 Keywords:            |    Verified:  0                 
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 Rainbow's technique for cleaning up bind-mounts fails in the face of
 recursive bind-mounts such as occur in /var.

 Unfortunately, since there is no good way to topo-sort the mount tree,
 we're going to have to iteratively unmount the intersection of
 /proc/mounts and our island directory until we reach a fixed-point.

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Ticket URL: <https://dev.laptop.org/ticket/2527>
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