fix: UaF in boot-manifest-hash fallback #10
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CFDataGetBytePtr doesn't return a copy. Somehow it happened to work fine up until iOS 16.3.1, but on iOS 16.4+ the early CFRelease causes the result to be all zeroes. This isn't critical as it's just a fallback if it fails to get root-snapshot-name and that still works fine, but it's worth fixing anyway.
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CFDataGetBytePtr doesn't return a copy. Somehow it happened to work fine up until iOS 16.3.1, but on iOS 16.4+ the early CFRelease causes the result to be all zeroes.
This isn't critical as it's just a fallback if it fails to get root-snapshot-name and that still works fine, but it's worth fixing anyway.