ring0.asm

通过汇编获得Ring0级权限

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		.586P			;	保护模式
		.model flat,stdcall
		option casemap:none
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include		ddk\NTDDK.INC
include		Ring0.inc
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; 代码段
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		.code
	szBuffer	db	16 dup(0)
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MyIntFunc	proc
		push	edx
		call	eax
		iretd
MyIntFunc	endp

;====================================================================
AddMyInt	proc		uses edi
		local	@IDT

		sidt	szBuffer
		mov		edi,(IDT_REG ptr [szBuffer]).base
		add		edi,21h*8

	;	使用Int21中断,该中断在Win2k下没有使用
;		cli
		mov	eax,offset MyIntFunc
		mov	[edi],ax
		shr	eax,16
		mov	[edi+6],ax		;	设置入口地址
		mov	[edi+2],cs		;	设置段地址
	;	设置Ring3可以访问
		mov	WORD ptr [edi+4],0EE00h
;		sti

		ret
AddMyInt	endp
;====================================================================
WdmUnload	proc	DriverObject:DWORD
		local	@IDT

		sidt	szBuffer
		mov		edi,(IDT_REG ptr [szBuffer]).base
		add		edi,21h*8
		xor	eax,eax
		mov	[edi],ax
		mov	[edi+6],ax		;	设置入口地址
		mov	[edi+2],ax		;	设置段地址
		mov	WORD ptr [edi+4],ax

		ret
WdmUnload	endp
;====================================================================
DriverEntry		proc	DriverObj:DWORD,RegistryPath:DWORD


		mov		eax,DriverObj
		assume	eax:ptr DRIVER_OBJECT
		mov		[eax].DriverUnload,offset WdmUnload
		assume	eax:nothing
		invoke	AddMyInt

		xor	eax,eax
		ret
DriverEntry		endp
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end DriverEntry