// All actions are allowed by default and no policy evaluation is
		// required.

	case roleArn != "":
		arn, err := arn.Parse(roleArn)
		if err != nil {
			iamLogIf(GlobalContext, fmt.Errorf("error parsing role ARN %s: %v", roleArn, err))
			return false
		}
		svcPolicies = newMappedPolicy(sys.rolesMap[arn]).toSlice()

	default:
		// Check policy for parent user of service account.