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As far as I understand, EKS doesn't support PodSecurityPolicy yet so any user that can launch a pod can trivially root the host via host mounts already. This surprisingly isn't clearly documented.

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ECS doesn't have a top level resource called "PodSecurityPolicy" but we do provide task level configuration options for all the major settings that you would normally put in your pod security policy, including including adding and dropping capabilities, privileged or unprivileged mode, docker security options for controlling SELinux or AppArmor, ulimits, sysctl settings, among others. You can find all these configuration options and more documented here: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/...

It is definitely possible to prevent a task running in ECS from getting root access to the host. If there is something missing that you feel we need to add to ECS to better enable this, definitely reach out and let me know!

I'm referring to EKS here not ECS. EKS doesn't yet enable the PodSecurityPolicy admission controller, so any user that can launch a pod via EKS can root the EKS cluster regardless of RBAC rules. The main ask here is to just find a way to enable PodSecurityPolicy admission controller so that secure multi-user EKS clusters are possible like ECS.

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