No. https://en.wikipedia.org/wiki/Time-sharing#Security https://en.wikipedia.org/wiki/Time-sharing#Security Read up on basic user based security. Multiple use

No. https://en.wikipedia.org/wiki/Time-sharing#Security https://en.wikipedia.org/wiki/Time-sharing#Security Read up on basic user based security. Multiple users can exist on a system, each with its own resources, root/admin can effectively affect any user, so breaking the user-root barrier could allow a user to affect other users. Originally users meant actual people, but in modern systems users can belong to subsystem, so for example an HTTP server with a website may have its own user, but a mail system could have another, so a breach in the website system would be confined to said user. Going from user to root is called a Local Privilege Escalation and would allow a breach from the website to metastasize into the mail system.