(Redirected from SIL)
SIL is a new mechanism in iOS 18 to draw security indicators, like the orange dot when the microphone is in use. Supposedly it stands for Secure Indicator Light[1]. The rendering is done by an Exclave applet, talking directly to the display controller. This is isolated from userspace and even the kernel.
It seems to be supported on M4 and A18 devices.
The indicators that are currently available are:
- Camera (blue dot on status bar)
- Microphone (orange dot on status bar)
- FaceID (face icon and spinning circle)
- Lock (for the lock screen)
All of these are multi-frame animations. Some of them even have multiple states and a state transition graph.
The images are duplicated in both the RootFS volume (PrivateFrameworks/SILManager.framework) and in the ExclaveOS volume (Frameworks/SILManagerComponent.framework).