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CVE-2015-6764: Why can use g_textobj_pointer to get textobj_elements_pointer? #1

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@alset0326

In CVE-2015-6764 exploit, function leak_textobj_elements_pointer() can be used to get the textobj_elements_pointer. But why does it work?
I figure out that g_textobj_pointer stored in the second InternalField of JSObject. What type is this pointer and when does it be assigned?
Thank u so much.

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