Apple has been working to harden the XNU kernel that powers its various operating systems, including iOS and macOS, with a feature called "exclaves." The term appears to have first surfaced in a libc file in Apple's open source software collection in 2023, and subsequently within iOS 17, released in September of that year, as later noted by Howard Oakley on his Eclectic Light Co blog. Exclaves, Oakley observed last June, are believed to implement "domains isolated from the kernel that protect ke...