【code】ring0下的安全拷贝

BOOLEAN SafeCopyMemory(PVOID pDestination, PVOID pSourceAddress, SIZE_T SizeOfCopy)
{
    PMDL pMdl = NULL;
    PVOID pSafeAddress = NULL;
    if(!MmIsAddressValid(pDestination) || !MmIsAddressValid(pSourceAddress))
        return FALSE;
    pMdl = IoAllocateMdl(pDestination, (ULONG)SizeOfCopy, FALSE, FALSE, NULL);
    if(!pMdl)
        return FALSE;
    
    __try{
        MmProbeAndLockPages(pMdl, KernelMode, IoReadAccess);
    }
    __except(EXCEPTION_EXECUTE_HANDLER){
        IoFreeMdl(pMdl);
        return FALSE;
    }
    
    pSafeAddress = MmGetSystemAddressForMdlSafe(pMdl, NormalPagePriority);
    
    if(!pSafeAddress)        return FALSE;
    
    __try{
        RtlMoveMemory(pSafeAddress, pSourceAddress, SizeOfCopy);
    }
    __except(EXCEPTION_EXECUTE_HANDLER){
        ;
    }
    MmUnlockPages(pMdl);
    IoFreeMdl(pMdl);
    return TRUE;
}