获取NtOpenProcess的当前地址和原函数地址

// 获取当前NtOpenProcess的地址
ULONG GetCurr_Addr()
{
/*
LONG *SSDT_Adr,SSDT_NtOpenProcess_Cur_Addr,t_addr;
KdPrint(("驱动成功被加载中.............................\n"));
//读取SSDT表中索引值为0x7A的函数
//poi(poi(KeServiceDescriptorTable)+0x7a*4)
t_addr=(LONG)KeServiceDescriptorTable->ServiceTableBase;
KdPrint(("当前ServiceTableBase地址为%x \n",t_addr));
SSDT_Adr=(PLONG)(t_addr+0x7A*4);
KdPrint(("当前t_addr+0x7A*4=%x \n",SSDT_Adr));
SSDT_NtOpenProcess_Cur_Addr=*SSDT_Adr;
KdPrint(("当前SSDT_NtOpenProcess_Cur_Addr地址为%x \n",SSDT_NtOpenProcess_Cur_Addr));*/

/* */
ULONG SSDT_NtOpenProcess_Cur_Addr;
//读取SSDT表中 NtOpenProcess当前地址 KeServiceDescriptorTable
// [[KeServiceDescriptorTable]+0x7A*4]
__asm
{
push ebx
push eax
mov ebx, KeServiceDescriptorTable
mov ebx, [ebx]
mov eax, 0x7A
shl eax, 2     //imul eax, 4    // shl eax, 2
add ebx, eax
mov ebx,[ebx]
mov SSDT_NtOpenProcess_Cur_Addr, ebx

pop eax
pop ebx
}

KdPrint(("SSDT_NtOpenProcess_Cur_Addr=%x\n\n",SSDT_NtOpenProcess_Cur_Addr));

return SSDT_NtOpenProcess_Cur_Addr;
}

// 获取原函数地址
ULONG GetOld_Addr()
{
UNICODE_STRING Old_NtOpenProcess;
ULONG Old_Addr;
RtlInitUnicodeString(&Old_NtOpenProcess,L"NtOpenProcess");
Old_Addr = (ULONG)MmGetSystemRoutineAddress(&Old_NtOpenProcess);
KdPrint(("SSDT_NtOpenProcess_Old_Addr=%x\n\n", Old_Addr));

return Old_Addr;
}