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kOSKextReturnSystemPolicy
Policy is a separate decision point
kOSKextReturnSystemPolicy means that macOS policy prevented the kext from loading. It should not be treated as proof that the bundle is malformed or unauthenticated: validation and authentication decide whether a bundle passes their checks, while policy decides whether the operating system permits that extension in the current security and management context.
Apple documents additional controls for third-party kexts, including approval requirements, restart-related deployment through the Auxiliary Kernel Collection, and hardware-specific startup security conditions. Managed Macs can also be governed by an allowlist or other deployment policy. The decisive factor is the policy state of the affected Mac, not a generic setting copied from another machine.
What to establish
- Record macOS version, hardware family, current boot-security context, and whether the Mac is managed.
- Determine whether the failure concerns user approval, an organization-managed allowlist, an Auxiliary Kernel Collection update, or a platform security prerequisite.
- Keep policy evidence separate from signing and dependency diagnostics so that the real blocking stage is not obscured.
- Do not disable platform protections as a routine workaround; use the supported deployment path or assess whether DriverKit is suitable for the driver.
References
- XNU: OSKextLib.h
- Apple Platform Security: securely extending the kernel
- Apple Deployment: system extensions in macOS
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