Let's have a look at how JavaScriptCore implements JavaScript Objects and values like integers and floats. We can use lldb to look into the memory.

Phrack: http://phrack.org/papers/attacking_javascript_engines.html
The Linus: https://twitter.com/linushenze
The Exploit: https://github.com/LinusHenze/WebKit-RegEx-Exploit
The Fix: https://bugs.webkit.org/show_bug.cgi?id=191731

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