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Explore the intricacies of Apple's UserFS (Userspace Filesystem) in this 26-minute Black Hat conference talk. Gain a comprehensive understanding of the UserFS architecture and its operational mechanisms. Compare the changes in filesystem security before and after UserFS implementation, examining how it reduces kernel attack surface while introducing new vulnerabilities. Delve into specific vulnerabilities discovered through reverse-engineering and analysis, including both kernel and userspace weaknesses. Evaluate the effectiveness of UserFS in hardening iOS security and consider potential avenues for system exploitation. Learn from speaker Zuozhi Fan's in-depth research and findings on this critical component of Apple's ecosystem.
