Function IsMemoryRangePresent

Kernel-Bridge/API/PteUtils.cpp:294–317

    _IRQL_requires_max_(APC_LEVEL)
    BOOLEAN IsMemoryRangePresent(OPTIONAL PEPROCESS Process, PVOID Address, SIZE_T Size)
    {
        if (!Size) return FALSE;

        BOOLEAN NeedToAttach = Process && Process != PsGetCurrentProcess();
        KAPC_STATE ApcState;
        if (NeedToAttach)
            KeStackAttachProcess(Process, &ApcState);

        BOOLEAN IsPresent = TRUE;

        PVOID Page = Address;
        do {
            ULONG PageSize = 0;
            IsPresent = IsPagePresent(Address, &PageSize) && PageSize;
            if (!IsPresent) break;
            Page = reinterpret_cast<PVOID>(reinterpret_cast<SIZE_T>(ALIGN_DOWN_POINTER_BY(Page, PageSize)) + PageSize);
        } while (Page < reinterpret_cast<PVOID>(reinterpret_cast<SIZE_T>(Address) + Size));

        if (NeedToAttach)
            KeUnstackDetachProcess(&ApcState);

        return IsPresent;
    }
}