Dice Question Streamline Icon: https://streamlinehq.com

Secure Indicator Light (SIL) rendering path within Exclaves

Determine the exact mechanisms by which Exclaves components render the Secure Indicator Light (SIL), including the control flow from exclaves_sensor_start through the Exclave Indicator Controller (EIC) and any Secure RTKit interactions with the Display Coprocessor (DCP) in Apple’s guarded execution environment.

Information Square Streamline Icon: https://streamlinehq.com

Background

The paper identifies Exclave resources such as ExclaveIndicatorController and the SILManagerComponent framework, and notes a linkage between sensor start operations and indicators. However, due to redacted code, the authors cannot reconstruct the rendering path.

Elucidating this mechanism is central to evaluating SIL’s robustness against tampering and the trust boundaries enforced by Exclaves.

References

Due to the redacted code in the further handling of the call, we are unable to determine the exact mechanisms regarding SIL rendering.

— Modern iOS Security Features -- A Deep Dive into SPTM, TXM, and Exclaves (2510.09272 - Steffin et al., 10 Oct 2025) in Section “Exclaves — Secure Indicator Light”