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75d2080e53
Changing the real and effective user/group IDs and the saved set-user/group-ID is not enough to get rid of intial access permissions. The list of groups must be cleared also, otherwise a process changing from, e.g. `root:root` to `nobody:nobody` retains rights to access `:wheel` files (assuming `root` is a member of the `wheel` group). For example: ``` # id uid=0(root) gid=0(wheel) groups=0(wheel), 2(kmem), 3(sys), 4(tty), 5(operator), 20(staff), 31(guest) # ./yggdrasil -autoconf -logto /dev/null -user nobody & [1] 4337 # ps -o command,user,group,supgrp -U nobody COMMAND USER GROUP SUPGRP ./yggdrasil -aut nobody nobody wheel,kmem,sys,tty,operator,staff,guest ``` Fix that so the process runs as mere ``` COMMAND USER GROUP SUPGRP ./yggdrasil -aut nobody nobody nobody ``` Fixes #927.