Wrote a Blog Post
Worked with iot
In this post, I will present the minimal set of privileges required for the Greengrass Core Device to operate.

NOTE: I am aware that this post is a bit rough introduction to the AWS IoT Greengrass service. I will mention a few concepts without a proper explanation (like Deployments and Components), but I do hope it will help you understand how the Greengrass service works. I will cover other Greengrass concepts in my future posts.

https://www.thingrex.com/aws_iot_greengrass_permissions/