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山寨U盘加解密
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发表于: 2013-3-26 20:29
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翻阅硬盘，偶然发现了很久以前的许多代码，当初只是改着玩一玩，也没有往深了写，发出来坐等大牛各种拍砖。大概看了一下，ms创建了一个线程来处理读写请求。改的diskperf，实在很挫，难登大雅之堂。
VOID
DiskPerfReadWriteThread(
IN PVOID Context
)
{
PDEVICE_OBJECT pDevice=(PDEVICE_OBJECT)Context;
PDEVICE_EXTENSION DevExt=pDevice->DeviceExtension;
PLIST_ENTRY ReqEntry=NULL;
NTSTATUS status;
PIRP Irp=NULL;
PIO_STACK_LOCATION Irpsp=NULL;
ULONG length=0;
LARGE_INTEGER offset={0};
PUCHAR sysBuf=NULL;
KeSetPriorityThread(KeGetCurrentThread(), LOW_REALTIME_PRIORITY);
for (; ; )
{
KeWaitForSingleObject(
&DevExt->ReqEvent,
Executive,
KernelMode,
FALSE,
NULL);
if (DevExt->ThreadTermFlag)
{
PsTerminateSystemThread(STATUS_SUCCESS);
return ;
}
while (ReqEntry=ExInterlockedRemoveHeadList(&DevExt->ReqList, &DevExt->ReqLock))
{
Irp=CONTAINING_RECORD(ReqEntry, IRP, Tail.Overlay.ListEntry);
Irpsp=IoGetCurrentIrpStackLocation(Irp);
if (NULL==Irp->MdlAddress)
{
sysBuf=(PUCHAR)Irp->UserBuffer;
}
else
{
sysBuf=(PUCHAR)MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
}
/* if (gPDevice==DevExt->PhysicalDeviceObject || gPDevice==NULL)
{
IoSkipCurrentIrpStackLocation(Irp);
IoCallDriver(DevExt->TargetDeviceObject, Irp);
continue;
}*/
/* if (DiskPerfIsCVolume(DevExt))
{
IoSkipCurrentIrpStackLocation(Irp);
IoCallDriver(DevExt->TargetDeviceObject, Irp);
continue;
}*/
if (!DevExt->VolumeOnline)
{
IoSkipCurrentIrpStackLocation(Irp);
IoCallDriver(DevExt->TargetDeviceObject, Irp);
continue;
}
if(IRP_MJ_READ==Irpsp->MajorFunction)
{
IRP_CONTEXT readContext;
KEVENT event;
offset=Irpsp->Parameters.Read.ByteOffset;
length=Irpsp->Parameters.Read.Length;
readContext.DataBuf=sysBuf;
readContext.length=length;
readContext.offset=offset;
KeInitializeEvent(&event, NotificationEvent, FALSE);
readContext.Event=&event;
IoCopyCurrentIrpStackLocationToNext(Irp);
IoSetCompletionRoutine(
Irp,
DiskPerfReadCompletion,
&readContext,
TRUE,
TRUE,
TRUE);
status=IoCallDriver(DevExt->TargetDeviceObject, Irp);
if (status== STATUS_PENDING)
{
KeWaitForSingleObject(
&event,
Executive,
KernelMode,
FALSE,
NULL);
status=Irp->IoStatus.Status;
}
Irp->IoStatus.Status=STATUS_SUCCESS;
// IoCompleteRequest(Irp, IO_DISK_INCREMENT);
continue;
}
else
{
int i=0;
IRP_CONTEXT readContext;
KEVENT event;
offset=Irpsp->Parameters.Write.ByteOffset;
length=Irpsp->Parameters.Write.Length;
readContext.DataBuf=sysBuf;
readContext.length=length;
readContext.offset=offset;
KeInitializeEvent(&event, NotificationEvent, FALSE);
readContext.Event=&event;
for(i=0; i<length; i++)
{
sysBuf[i]=sysBuf[i]^0xff;
}
IoCopyCurrentIrpStackLocationToNext(Irp);
IoSetCompletionRoutine(
Irp,
DiskPerfWriteCompletion,
&readContext,
TRUE,
TRUE,
TRUE);
status=IoCallDriver(DevExt->TargetDeviceObject, Irp);
if (status== STATUS_PENDING)
{
KeWaitForSingleObject(
&event,
Executive,
KernelMode,
FALSE,
NULL);
status=Irp->IoStatus.Status;
}
Irp->IoStatus.Status=STATUS_SUCCESS;
// IoCompleteRequest(Irp, IO_DISK_INCREMENT);
continue;
}
}
}
}
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