Proxy Window Objects for Secure Window Manager Rendering

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Solution Overview

Problem

Existing computing devices face security risks and performance degradation due to third-party applications accessing the window manager process space, leading to potential crashes and increased memory usage.

Innovation Solution

Implementing a window manager process that hosts proxy window objects created by applications within a composite display structure, allowing the application to control data processing while the window manager controls rendering, thereby preventing direct access to the window manager process and managing memory usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If applications directly access the window manager process space, then applications can control rendering and display, but security risks increase and system stability decreases

Engineering Contradiction:

Improveapplication control over renderingVSAvoidsystem stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces a proxy window object as an intermediary between the application and the window manager process space. The application creates and controls the proxy window object within its own process space, which then communicates with the window manager through defined interfaces. This mediator approach allows the application to influence rendering without directly accessing the window manager process, maintaining security while enabling functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If applications are allowed in the window manager process space, then integration is improved, but memory footprint increases and performance degrades

Engineering Contradiction:

Improveapplication integrationVSAvoidmemory footprint

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent segments the window manager functionality by creating separate proxy window objects for each application within the window manager's process space. Instead of allowing applications to occupy large portions of the window manager process space, each application gets a focused, isolated proxy object that only contains the necessary elements for that specific application's display needs. This segmentation reduces the overall memory footprint while maintaining integration capabilities.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If applications have direct access to window manager process space, then direct control is achieved, but security vulnerabilities increase

Engineering Contradiction:

Improvedirect controlVSAvoidsecurity risks

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The proxy window object serves as a security intermediary that enforces access control policies. It provides a controlled interface through which applications can request rendering operations, while the window manager validates and authorizes these requests. This intermediary layer prevents direct access to sensitive window manager resources, blocking potential security vulnerabilities while still allowing legitimate control operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a proxy window object that is a controlled copy or representation of the application's display elements within the window manager's process space. Rather than allowing the application to directly manipulate window manager objects, the system creates isolated proxy representations that can be safely managed and controlled by the window manager, reducing security risks associated with direct access.

Inventive Principle:

Principle #26Copying

4Adaptability or versatility

If multiple applications occupy window manager process space, then functionality increases, but crash risk increases

Engineering Contradiction:

Improveapplication functionalityVSAvoidcrash resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent isolates each application's display elements into separate proxy window objects within the window manager's process space. This segmentation creates logical boundaries that prevent failures in one application's proxy object from propagating to other applications or crashing the entire window manager process. Each proxy object can be independently managed, updated, or destroyed without affecting the stability of the overall system.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8656418B2Providing a proxy view for an application in a window manager

Publication Date: 2014.02.18 APPLE INC

AI summary

A window manager process hosts proxy window objects created by an application in a window manager display structure. A process in a device creates a local proxy view object within a window manager display structure for the window manager process. The process registers an identifier for a remote proxy window object which corresponds to an application display structure. The application controls processing of data used by the application. The process assigns the identifier for the remote proxy window object to the local proxy view object in the window manager display structure to create a composite display structure and renders the composite display structure to display an image on a display device. The image corresponds to the objects of the application display structure represented by the remote proxy window object. The window manager process controls rendering of the composite display structure.