https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/1425685
http://www.halfdog.net/Security/2015/UpstartLogrotationPrivilegeEscalation/
http://seclists.org/fulldisclosure/2015/Mar/7
http://packetstormsecurity.com/files/130587/Ubuntu-Vivid-Upstart-Privilege-Escalation.html
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