This IAM role provides full access to S3 and allows accessing or writing S3 data:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"iam:PassRole"
],
"Resource": [
"*"
]
},
{
"Effect": "Allow",
"Action": [
"s3:*"
],
"Resource": [
"*"
]
}
]
}