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Kunal Dawn


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Security-Enhanced Linux in Android

SELinux operates on the ethos of default denial. Anything that is not explicitly allowed is denied. SELinux can operate in one of two global modes: permissive mode, in which permission denials are logged but not enforced, and enforcing mode, in which denials are both logged and enforced. SELinux also supports a per-domain permissive mode in which specific domains (processes) can be made permissive while placing the rest of the system in global enforcing mode. A domain is simply a label identifying a process or set of processes in the security policy, where all processes labeled with the same domain are treated identically by the security policy. Per-domain permissive mode enables incremental application of SELinux to an ever-increasing portion of the system. Per-domain permissive mode also enables policy development for new services while keeping the rest of the system enforcing. Continue reading