lkd> dt _EPROCESS
nt!_EPROCESS
+0x000 Pcb : _KPROCESS
+0x06c ProcessLock : _EX_PUSH_LOCK
+0x070 CreateTime : _LARGE_INTEGER
+0x078 ExitTime : _LARGE_INTEGER
+0x080 RundownProtect : _EX_RUNDOWN_REF
+0x084 UniqueProcessId : Ptr32 Void
+0x088 ActiveProcessLinks : _LIST_ENTRY
+0x090 QuotaUsage : [3] Uint4B
+0x09c QuotaPeak : [3] Uint4B
+0x0a8 CommitCharge : Uint4B
+0x0ac PeakVirtualSize : Uint4B
+0x0b0 VirtualSize : Uint4B
+0x0b4 SessionProcessLinks : _LIST_ENTRY
+0x0bc DebugPort : Ptr32 Void
+0x0c0 ExceptionPort : Ptr32 Void
+0x0c4 ObjectTable : Ptr32 _HANDLE_TABLE
+0x0c8 Token : _EX_FAST_REF
+0x0cc WorkingSetLock : _FAST_MUTEX
+0x0ec WorkingSetPage : Uint4B
+0x0f0 AddressCreationLock : _FAST_MUTEX
+0x110 HyperSpaceLock : Uint4B
+0x114 ForkInProgress : Ptr32 _ETHREAD
+0x118 HardwareTrigger : Uint4B
+0x11c VadRoot : Ptr32 Void
+0x120 VadHint : Ptr32 Void
+0x124 CloneRoot : Ptr32 Void
+0x128 NumberOfPrivatePages : Uint4B
+0x12c NumberOfLockedPages : Uint4B
+0x130 Win32Process : Ptr32 Void
+0x134 Job : Ptr32 _EJOB
+0x138 SectionObject : Ptr32 Void
+0x13c SectionBaseAddress : Ptr32 Void
+0x140 QuotaBlock : Ptr32 _EPROCESS_QUOTA_BLOCK
+0x144 WorkingSetWatch : Ptr32 _PAGEFAULT_HISTORY
+0x148 Win32WindowStation : Ptr32 Void
+0x14c InheritedFromUniqueProcessId : Ptr32 Void
+0x150 LdtInformation : Ptr32 Void
+0x154 VadFreeHint : Ptr32 Void
+0x158 VdmObjects : Ptr32 Void
+0x15c DeviceMap : Ptr32 Void
+0x160 PhysicalVadList : _LIST_ENTRY
+0x168 PageDirectoryPte : _HARDWARE_PTE
+0x168 Filler : Uint8B
+0x170 Session : Ptr32 Void
+0x174 ImageFileName : [16] UChar
+0x184 JobLinks : _LIST_ENTRY
+0x18c LockedPagesList : Ptr32 Void
+0x190 ThreadListHead : _LIST_ENTRY
+0x198 SecurityPort : Ptr32 Void
+0x19c PaeTop : Ptr32 Void
+0x1a0 ActiveThreads : Uint4B
+0x1a4 GrantedAccess : Uint4B
+0x1a8 DefaultHardErrorProcessing : Uint4B
+0x1ac LastThreadExitStatus : Int4B
+0x1b0 Peb : Ptr32 _PEB
+0x1b4 PrefetchTrace : _EX_FAST_REF
+0x1b8 ReadOperationCount : _LARGE_INTEGER
+0x1c0 WriteOperationCount : _LARGE_INTEGER
+0x1c8 OtherOperationCount : _LARGE_INTEGER
+0x1d0 ReadTransferCount : _LARGE_INTEGER
+0x1d8 WriteTransferCount : _LARGE_INTEGER
+0x1e0 OtherTransferCount : _LARGE_INTEGER
+0x1e8 CommitChargeLimit : Uint4B
+0x1ec CommitChargePeak : Uint4B
+0x1f0 AweInfo : Ptr32 Void
+0x1f4 SeAuditProcessCreationInfo : _SE_AUDIT_PROCESS_CREATION_INFO
+0x1f8 Vm : _MMSUPPORT
+0x238 LastFaultCount : Uint4B
+0x23c ModifiedPageCount : Uint4B
+0x240 NumberOfVads : Uint4B
+0x244 JobStatus : Uint4B
+0x248 Flags : Uint4B
+0x248 CreateReported : Pos 0, 1 Bit
+0x248 NoDebugInherit : Pos 1, 1 Bit
+0x248 ProcessExiting : Pos 2, 1 Bit
+0x248 ProcessDelete : Pos 3, 1 Bit
+0x248 Wow64SplitPages : Pos 4, 1 Bit
+0x248 VmDeleted : Pos 5, 1 Bit
+0x248 OutswapEnabled : Pos 6, 1 Bit
+0x248 Outswapped : Pos 7, 1 Bit
+0x248 ForkFailed : Pos 8, 1 Bit
+0x248 HasPhysicalVad : Pos 9, 1 Bit
+0x248 AddressSpaceInitialized : Pos 10, 2 Bits
+0x248 SetTimerResolution : Pos 12, 1 Bit
+0x248 BreakOnTermination : Pos 13, 1 Bit
+0x248 SessionCreationUnderway : Pos 14, 1 Bit
+0x248 WriteWatch : Pos 15, 1 Bit
+0x248 ProcessInSession : Pos 16, 1 Bit
+0x248 OverrideAddressSpace : Pos 17, 1 Bit
+0x248 HasAddressSpace : Pos 18, 1 Bit
+0x248 LaunchPrefetched : Pos 19, 1 Bit
+0x248 InjectInpageErrors : Pos 20, 1 Bit
+0x248 VmTopDown : Pos 21, 1 Bit
+0x248 Unused3 : Pos 22, 1 Bit
+0x248 Unused4 : Pos 23, 1 Bit
+0x248 VdmAllowed : Pos 24, 1 Bit
+0x248 Unused : Pos 25, 5 Bits
+0x248 Unused1 : Pos 30, 1 Bit
+0x248 Unused2 : Pos 31, 1 Bit
+0x24c ExitStatus : Int4B
+0x250 NextPageColor : Uint2B
+0x252 SubSystemMinorVersion : UChar
+0x253 SubSystemMajorVersion : UChar
+0x252 SubSystemVersion : Uint2B
+0x254 PriorityClass : UChar
+0x255 WorkingSetAcquiredUnsafe : UChar
+0x258 Cookie : Uint4B
//转贴最近研究某驱动DebugPort清零，学习了使用Windbg查看_EPROCESS结构地址，采用Syser下断查找清零代码。下面主要写下Windbg查看进程的_EPROCESS结构，便以后查阅。大家知道，每一个进程都对应一个_EPROCESS结构,我们如何确定一个进程的_EPROCESS地址呢？以notepad.exe为例使用Windbg的Kernel Debug，输入命令lkd> !process 0 0 //查看当前进程PROCESS 8a5e7088 SessionId: 0 Cid: 0ff0 Peb: 7ffdd000 ParentCid: 0324 DirBase: 0ac40520 ObjectTable: e1a13a30 HandleCount: 65. Image: windbg.exePROCESS 882f2650 SessionId: 0 Cid: 07d8 Peb: 7ffd7000 ParentCid: 0324 DirBase: 0ac404e0 ObjectTable: e506af88 HandleCount: 48. Image: notepad.exe。。。。。可以看到 PROCESS 882f2650,882f2650就是notepad.exe的_EPROCESS结构地址lkd> dt _eprocess 882f2650 //查看notepad.exe的_EPROCESSnt!_EPROCESS +0x000 Pcb : _KPROCESS +0x06c ProcessLock : _EX_PUSH_LOCK +0x070 CreateTime : _LARGE_INTEGER 0x1cb68eb`1575a5ee +0x078 ExitTime : _LARGE_INTEGER 0x0 +0x080 RundownProtect : _EX_RUNDOWN_REF +0x084 UniqueProcessId : 0x000007d8 Void +0x088 ActiveProcessLinks : _LIST_ENTRY [ 0x805648b8 - 0x8a5e7110 ] +0x090 QuotaUsage : [3] 0xc58 +0x09c QuotaPeak : [3] 0x1080 +0x0a8 CommitCharge : 0x220 +0x0ac PeakVirtualSize : 0x2453000 +0x0b0 VirtualSize : 0x22bf000 +0x0b4 SessionProcessLinks : _LIST_ENTRY [ 0xba632014 - 0x8a5e713c ] +0x0bc DebugPort : (null) +0x0c0 ExceptionPort : 0xe1be7658 Void +0x0c4 ObjectTable : 0xe506af88 _HANDLE_TABLE +0x0c8 Token : _EX_FAST_REF +0x0cc WorkingSetLock : _FAST_MUTEX +0x0ec WorkingSetPage : 0x7bbc2 +0x0f0 AddressCreationLock : _FAST_MUTEX +0x110 HyperSpaceLock : 0 +0x114 ForkInProgress : (null) +0x118 HardwareTrigger : 0 +0x11c VadRoot : 0x8a626df0 Void +0x120 VadHint : 0x88380130 Void +0x124 CloneRoot : (null)_EPROCESS + bc处为Debugprot地址，可以使用Syser下断bpm 882f2650+bc w 断在notepad.exe的DebugPort处，如有对它的处理就会断住。。
//转贴
如果是直接来要最终结果的，请绕行，这里只对debugport 清零代码进行逆向。
由于TX会Anti Windbg，用上次的方法后，Windbg能很好的跑起来，但是作者还是热衷于单机调试，在一次偶然的情况下，发现TX没有对SyserDebugger进行anti，这里膜拜下syserdebugger的作者，该调试器据说是作者一人开发，而该作者对内核的熟悉程度，让人有点想流口水。
不管是windbg还是syserdbg， 你都可以下 对EPROCESS+0xbc的写入断点。
windbg ba w addr
syser bpm addr w
这里我们看到syser是兼容了softice指令的。下断后很快就会被断下，可见debugport被清零之频繁。
syser debugger 的菜单有时候会不灵，暂时只能用命令了。 u eip-40.
我们可以清晰的看到tessafe.sys如何对DebugPort清零的
mov edi, edi
push ebp
mov ebp, esp
push ecx
push ebx
xor ebx, ebx
cmp dword ptr [B1DD4050], 5
push esi
mov byte ptr [ebp-2], 1
jne short B1DCB575
cmp dword ptr [B1DD4054], ebx
mov byte ptr [ebp-1], 1
je short B1DCB578
mov byte ptr [ebp-1], bl
mov ecx, B1DD90B0
call dword ptr [<&hal.KfAcquireSpinLock>]
mov esi, dword ptr [B1DD8F60]
cmp esi, B1DD8F60
mov byte ptr [ebp-3], al
je B1DCB61B
mov byte ptr [ebp-2], bl
push edi
mov ecx, dword ptr [B1DD4EC0]
mov ecx, dword ptr [ecx+4]
lea edx, dword ptr [esi-10]
add ecx, dword ptr [edx]
xor eax, eax
xchg dword ptr [ecx], eax
cmp byte ptr [B1DD4EC8], bl
je short B1DCB610
cmp byte ptr [ebp-1], bl
mov ecx, dword ptr [B1DD4EC0]
mov eax, dword ptr [edx]
mov ecx, dword ptr [ecx+C]
mov edi, dword ptr [eax+ecx]
je short B1DCB5E0
cmp edi, ebx
jne short B1DCB610
mov ecx, dword ptr [B1DD4EC0]
mov ecx, dword ptr [ecx]
cmp dword ptr [eax+ecx], 103
je short B1DCB610
jmp short B1DCB5F2
mov ecx, dword ptr [B1DD4EC0]
mov ecx, dword ptr [ecx+10]
cmp dword ptr [eax+ecx], ebx
jne short B1DCB610
cmp edi, ebx
jne short B1DCB610
mov eax, dword ptr [esi]
mov ecx, dword ptr [esi+4]
mov dword ptr [ecx], eax
mov dword ptr [eax+4], ecx
mov eax, B1DD529C
or ecx, FFFFFFFF
lock xadd dword ptr [eax], ecx
push ebx
push edx
call dword ptr [<&ntoskrnl.ExFreePoolWithTag>]
mov esi, dword ptr [esi]
cmp esi, B1DD8F60
jne short B1DCB59C
pop edi
mov dl, byte ptr [ebp-3]
mov ecx, B1DD90B0
call dword ptr [<&hal.KfReleaseSpinLock>]
mov al, byte ptr [ebp-2]
pop esi
pop ebx
leave
retn
int3
int3
int3
int3
int3
int3
就这了。。。突然好累，不想写了。。。。 将那个指针改掉，不能改代码
新版dxxxxfffefefe 对原来的校验非常严格，这个方法已经早就行不通了，只有按照tufuzi说的，修复受影响的函数。