Function mem_set_perms

/ Set a memory page to be writable, so we can patch it. Save the */ info so we can undo the changes afterwards. This is for x86-64, */ since it has a 4 level page table. Every part of the walk to */ the final PTE needs to be writable, not just the entry itself. */ Reference: */ http://www.intel.com/design/processor/applnots/317080.pdf */ /