About Lockdown Mode
Notable highlights for me:<p>> Lockdown Mode is available in iOS 16 and coming soon in iPadOS 16 and macOS Ventura.<p>> Web browsing - Certain complex web technologies are blocked, which might cause some websites to load more slowly or not operate correctly. In addition, web fonts might not be displayed, and images might be replaced with a missing image icon.<p>The first sentence I believe is referring to disabling JIT (just in time compilation of Javascript), which is dangerous as it allocates W+X pages which are often used by the final stage of an exploit. Apple did an amazing job already of hardening iOS by severely restricting which applications can use JIT (and this is their justification for why non-Safari browser engines are not allowed on iOS) and even enabling per-thread memory page permissions. Many more details are in this fantastic post from Google's project Zero: <a href="https://googleprojectzero.blogspot.com/2020/09/jitsploitation-three.html" rel="nofollow">https://googleprojectzero.blogspot.com/2020/09/jitsploitatio...</a><p>Overall it's very interesting to see Apple invest so significantly in something that will benefit relatively few users -- not that I'm complaining!