Greg Parker
[objc explain]: Non-pointer isa. http://sealiesoftware.com/blog/671674.html … On iOS for arm64, the isa field of Objective-C objects is no longer a pointer.
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@gparker Doesn't that require mapping any binary into the lowest 32 bits of address space, making ASLR less useful?
Benjamin Kramer
@d0k iOS 7 currently uses only a 33-bit virtual address space, and the isa spans it all. Even OS X uses only 47 bits outside the kernel.
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@gparker Ow. 47 bits is far more than 33 bits for ASLR and mapping everything without having to conserve address space though.
Filipe Cabecinhas
Charles Parnot
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