0000000001340000 is the start address of the shared memory, 00000000000013C4 is the handle of the child process, 487 is a system error code when VirtualAllocEx fails, 466165760 is an area of shared memory. Although the start address is in the FREE area, it seems that the reservation failed ...
The problem is that VirtualAllocEx (MEM_RESERVE, PAGE_READWRITE) has failed with system error code 487. Since I reserved the address space after starting the child process in the suspended state, I think that it has not been used already. Per step 2, child process is started with it's ...