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- Subject: Re: Integer subtype and NaN trick
- From: Owen Shepherd <owen.shepherd@...>
- Date: Sun, 16 Jun 2013 08:14:35 +0100
Coda Highland wrote:
Unless I'm wrong, ASLR isn't restricted to 48 bits. Virtual memory
allocation can use whatever addresses it wants.
The hardware itself is physically limited to 48-bits. Each page is 4kB, plus there are 4 layers of page tables, bringing the total up to 48 bits.
The processors throw an exception on a memory access if bits 63-48 don't match bit 47.
This is all baked into silicon