macOS/IOS: mach_msg doesn't copy memory in a certain case(CVE-2017-2456)

When sending ool memory via |machmsg| with |deallocate| flag or |MACHMSGVIRTUALCOPY| flag, |machmsg| performs moving the memory to the destination process instead of copying it. But it doesn't consider the memory entry object that could resurrect the moved memory. As a result, it could lead to a...

Apple macOS/IOS 10.12.2 (16C67) - 'mach_msg' Heap Overflow

/ Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1083 When sending ool memory via |machmsg| with |deallocate| flag or |MACHMSGVIRTUALCOPY| flag, |machmsg| performs moving the memory to the destination process instead of copying it. But it doesn't consider the memory entry objec...