[原创]多核机器下添加新中断的方法
发表于:
2008-12-11 23:51
8623
【文章标题】: 多核情况下添加新中断的方法
【文章作者】: chimney
【作者声明】: 只是感兴趣,没有其他目的。失误之处敬请诸位大侠赐教!
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【详细过程】
中断向量表的修改应该都很熟悉了,combojiang大侠在他的rootkit hook系列文章里将的很详细了。但是combojiang文章
中有关IDT的代码都是在单核机器中实现的,如果你有个双核的机子,你正好又学习了combojiang大大的文章,你就会发现出
问题了。因为每个CPU 都有自己的中断向量表。在多核的机子上,如果你修改了CPU 1的中断向量表,如果应用程序不是运行
在CPU 1上,而是在别的CPU上,这时候就会出现问题了。
在多核的 CPU 上添加新中断,我想方法有两种。一种是让应用程序运行在修改中断向量表的那个CPUS上,另一个是将所有
的CPU的中断向量表都修改,这样应用层就不用管自己运行在那个CPU上了,中断都不会导致系统的崩溃。
让某个程序运行在某个CPU上,那就要设置程序的亲和性了,在应用层设置进程和线程的亲和性的函数是
SetProcessAffinityMask/SetThreadAffinityMask。那么在内核呢?google了下,发现了diyhack 提到了个函数
KeSetSystemAffinityThread。
KeSetSystemAffinityThread是个内核导出的函数,但在DDK头文件中没有发现他的定义,帮助中也没有看见有文字介绍,
于是就直奔WRK。在WRK中找到了这个函数。
VOID
KeSetSystemAffinityThread (
__in KAFFINITY Affinity
)
/*++
Routine Description:
This function set the system affinity of the current thread
Arguments:
Affinity - Supplies the new of set of processors on which the thread can run.
Return Value:
None.
--*/
KeSetSystemAffinityThread 设置当前线程的系统亲和性。在wrk和google的帮助下,实现了在多核下修改IDT比较稳定的
方法。
#include "ntddk.h"
#include "string.h"
#include "stdio.h"
#define ADDINT 0x22
#define MAX_NUM_PROCESSER 8
extern VOID KeSetSystemAffinityThread(KAFFINITY Affinity); //函数声明下
#pragma pack(1)
typedef struct
{
unsigned short LowOffset;
unsigned short selector;
unsigned char unused_lo;
unsigned char segment_type:4; //0x0E is an interrupt gate
unsigned char system_segment_flag:1;
unsigned char DPL:2; // descriptor privilege level
unsigned char P:1; // present
unsigned short HiOffset;
} IDTENTRY;
typedef struct
{
unsigned short IDTLimit;
union
{
unsigned long IDTbase;
};
} IDTINFO;
#pragma pack(1)
IDTENTRY OldIdtEntry[MAX_NUM_PROCESSER]={ 0 };
IDTINFO idt_info[MAX_NUM_PROCESSER]={ 0 };
ULONG orgcr0;
void __declspec (naked) InterruptHandler()
{
_asm iretd
}
VOID DisableWriteProtect(PULONG pOldAttr)
{
ULONG uAttr;
_asm
{
push eax
mov eax, cr0
mov uAttr, eax
and eax, 0FFFEFFFFh // CR0 16 BIT = 0
mov cr0, eax
pop eax
};
*pOldAttr = uAttr; //保存原有的 CRO 属性
}
VOID EnableWriteProtect(ULONG uOldAttr )
{
_asm
{
push eax
mov eax, uOldAttr //恢复原有 CR0 属性
mov cr0, eax
pop eax
};
}
VOID AddInterrupt(LONG dwIndex)
{
IDTENTRY* idt_entries;
IDTINFO idt_infoTmp;
__asm sidt idt_infoTmp;
idt_info[dwIndex]=idt_infoTmp;
idt_entries = (IDTENTRY*)idt_info[dwIndex].IDTbase;
DbgPrint("idt_entries=%x",idt_entries);
if ((idt_entries[ADDINT].LowOffset != 0) || (idt_entries[ADDINT].HiOffset != 0))
return;
DisableWriteProtect(&orgcr0);
memcpy(&OldIdtEntry[dwIndex], &idt_entries[ADDINT], sizeof(IDTENTRY));
idt_entries[ADDINT].LowOffset = (unsigned short)InterruptHandler;
idt_entries[ADDINT].selector = 8;
idt_entries[ADDINT].unused_lo = 0;
idt_entries[ADDINT].segment_type = 0xE;
idt_entries[ADDINT].system_segment_flag = 0;
idt_entries[ADDINT].DPL = 3;
idt_entries[ADDINT].P = 1;
idt_entries[ADDINT].HiOffset = (unsigned short)((unsigned int) InterruptHandler>>16);
EnableWriteProtect(orgcr0);
return;
}
void RemoveInterrupt(LONG dwIndex)
{
IDTENTRY* idt_entries;
idt_entries = (IDTENTRY*)idt_info[dwIndex].IDTbase;
DbgPrint("idt_entries=%x",idt_entries);
DisableWriteProtect(&orgcr0);
memcpy(&idt_entries[ADDINT], &OldIdtEntry[dwIndex], sizeof(IDTENTRY));
EnableWriteProtect(orgcr0);
}
void DriverUnload (IN PDRIVER_OBJECT pDriverObject)
{
KAFFINITY ActiveProcessors, CurrentAffinity;
LONG dwTmp=0;
ActiveProcessors=KeQueryActiveProcessors();
DbgPrint("KeActiveProcessors=%d",ActiveProcessors);
for (CurrentAffinity = 1; ActiveProcessors; CurrentAffinity <<= 1)
{
if (ActiveProcessors & CurrentAffinity)
{
ActiveProcessors &= ~CurrentAffinity;
KeSetSystemAffinityThread(CurrentAffinity);
RemoveInterrupt(dwTmp);
dwTmp++;
}
}
}
NTSTATUS
DriverEntry(
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
)
{
NTSTATUS status = STATUS_SUCCESS;
KAFFINITY ActiveProcessors, CurrentAffinity;
LONG dwTmp=0;
ActiveProcessors=KeQueryActiveProcessors();
DbgPrint("KeActiveProcessors=%d",ActiveProcessors);
for (CurrentAffinity = 1; ActiveProcessors; CurrentAffinity <<= 1)
{
if (ActiveProcessors & CurrentAffinity)
{
ActiveProcessors &= ~CurrentAffinity;
KeSetSystemAffinityThread(CurrentAffinity);
AddInterrupt(dwTmp);
dwTmp++;
}
}
DriverObject->DriverUnload = DriverUnload;
return status;
}
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如有错误之处,还请大家指出!酷睿双核 windows xp sp2 下测试通过
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【版权声明】: 本文原创于看雪技术论坛, 转载请注明作者并保持文章的完整, 谢谢!
2008年12月11日 23:45:32
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