[Toybox] setuid (TOYFLAG_STAYROOT) requirement - in nested case

[Ashwini Sharma]

Hey Rob,

   I have a case, where setuid is required in nested case.

nested case:
  lets say there are two commands in toybox called __acmd__ and __bcmd__.
__acmd__ doesn't require setuid bit, whereas __bcmd__ does require setuid
bit.

Take a case where __acmd__ will run/launch __bcmd__. Now since __acmd__
doesn't need TOYFLAG_STAYROOT, this sets the euid to be of uid in
toy_init() function.
When __bcmd__ is run from __acmd__, this would have lost the setuid bit and
hence fails to run due to this.

Pls do give your opinion on the same.

regards,
Ashwini
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