KIRQL irqlCur;
PMDL pMdlSrc = NULL;
PMDL pMdlDst = NULL;
PVOID pMdlSafeSrc = NULL;
PVOID pMdlSafeDst = NULL;
/// 校验所有要操作的字节地址
ulLen = (ulLenToCopy > 0) ? (ulLenToCopy - 1) : 0;
do
{
if (/*!MmIsAddressValid(((UCHAR *)ulAddrDst + ulLen)) || */
!MmIsAddressValid(((UCHAR *)ulAddrSrc + ulLen)))
{
goto _SafeCopy_END;
}
} while (0 != ulLen--);
pMdlDst = IoAllocateMdl(ulAddrDst, ulLenToCopy, FALSE, FALSE, NULL);
pMdlSrc = IoAllocateMdl(ulAddrSrc, ulLenToCopy, FALSE, FALSE, NULL);
if ((NULL != pMdlSrc) && (NULL != pMdlDst))
{
__try
{
MmProbeAndLockPages(pMdlDst, UserMode, (LOCK_OPERATION)IoReadAccess);
MmProbeAndLockPages(pMdlSrc, KernelMode, (LOCK_OPERATION)(IoWriteAccess | IoReadAccess));
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
status = GetExceptionCode();
goto _SafeCopy_END;
}
}
pMdlSafeDst = MmGetSystemAddressForMdlSafe(pMdlDst, NormalPagePriority);
pMdlSafeSrc = MmGetSystemAddressForMdlSafe(pMdlSrc, NormalPagePriority);
if ((NULL != pMdlSafeDst) && (NULL != pMdlSafeSrc))
{
irqlCur = KeRaiseIrqlToDpcLevel();
memcpy(pMdlSafeDst, pMdlSafeSrc, ulLenToCopy);
KeLowerIrql(irqlCur);
status = STATUS_SUCCESS;
}
