In the digital world of Android, the permission mechanism is the cornerstone of ensuring user privacy and data security. It is a critically important task for security researchers and engineers to thoroughly study and understand this mechanism. This article will explore four key aspects of the Android permission mechanism: the Uid permission mechanism under Linux, the Permission permission mechanism in Android, the enforcement strategies of SEAndroid, and the fine-grained permission control.
Android is based on the existing permission management mechanism in Linux, which assigns different UIDs and GIDs to each application. The Uid permission mechanism isolates private data and access between different applications;
Android has added a permission mechanism to control the access permissions of components, hardware resources, etc. of Android applications;
The port from SELinux has also added permission control to access system services and other resources;
IPC (Inter-Process Communication) communication between Android apps requires access control through permission mechanisms.
*More Details: *Comprehensive research of Android Permission Mechanisms
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