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[求助]关于PspCidTable遍历进程
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发表于:
2010-8-16 17:03
5320
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近日学习PspCidTable，结合KsBinSword的代码
VOID IsValidProcess()
{
ULONG PspCidTable;
ULONG TableCode;
ULONG table1,table2;
ULONG object,objectheader;
ULONG NextFreeTableEntry;
ULONG processtype,type;
ULONG flags;
ULONG i;
PspCidTable=GetCidAddr();
processtype=GetProcessType();
if(PspCidTable==0)
{
return ;
}
else
{
//TableCode的最后两位在XP中决定了句柄表的层数
TableCode=*(PULONG)(*(PULONG)PspCidTable);
if((TableCode&0x3)==0x0)
{
table1=TableCode;
table2=0x0;
}
if((TableCode&0x3)==0x1)
{
TableCode=TableCode&0xfffffffc;
table1=*(PULONG)TableCode;
table2=*(PULONG)(TableCode+0x4);
}
//对cid从0x0到0x4e1c进行遍历
for(i=0x0;i<0x4e1c;i++)
{
if(i<=0x800)
{
if(MmIsAddressValid((PULONG)(table1+i*2)))
{
object=*(PULONG)(table1+i*2);
if(MmIsAddressValid((PULONG)(table1+i*2+NEXTFREETABLEENTRY)))
{
NextFreeTableEntry=*(PULONG)(table1+i*2+NEXTFREETABLEENTRY);
if(NextFreeTableEntry==0x0)//正常的_HANDLE_TABLE_ENTRY中NextFreeTableEntry为0x0
{
object=((object | 0x80000000)& 0xfffffff8);//转换为对象（体）指针
objectheader=(ULONG)OBJECT_TO_OBJECT_HEADER(object);//获取对象（头）指针
if(MmIsAddressValid((PULONG)(objectheader+TYPE)))
{
type=*(PULONG)(objectheader+TYPE);
if(type==processtype)
{
flags=*(PULONG)((ULONG)object+FLAGS);
if((flags&0xc)!=0xc)
RecordInfo(object);//flags显示进程没有退出
}
}
}
}
}
}
else
{
if(table2!=0)
{
if(MmIsAddressValid((PULONG)(table2+(i-0x800)*2)))
{
object=*(PULONG)(table2+(i-0x800)*2);
if(MmIsAddressValid((PULONG)((table2+(i-0x800)*2)+NEXTFREETABLEENTRY)))
{
NextFreeTableEntry=*(PULONG)((table2+(i-0x800)*2)+NEXTFREETABLEENTRY);
if(NextFreeTableEntry==0x0)
{
object=((object | 0x80000000)& 0xfffffff8);
objectheader=(ULONG)OBJECT_TO_OBJECT_HEADER(object);
if(MmIsAddressValid((PULONG)(objectheader+TYPE)))
{
type=*(PULONG)(objectheader+TYPE);
if(type==processtype)
{
flags=*(PULONG)((ULONG)object+FLAGS);
if((flags&0xc)!=0xc)
RecordInfo(object);
}
}
}
}
}
}
}
}
}
}
其中的
//对cid从0x0到0x4e1c进行遍历
for(i=0x0;i<0x4e1c;i++)
{
if(i<=0x800)
这个地方遍历方法我认为有些问题。
例如，如果句柄表只有一个，进程pid=0x5B8，那么它在表中的位置应该就是ulPspcidtableAddress + pid*2；
而pid*2 = 0xB70；
那么if语句将i与0x800比较的话不就跳过了这个进程么？
实在想不通，而且我windbg输入也没有输出这个进程。
望高手解答。
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