FS 寄存器使用

来源：互联网发布：传智播客java 编辑：程序博客网时间：2024/05/02 23:14

在用户层下，FS寄存器指向当前活动线程的TEB结构

nt!_TEB
   +0x000 NtTib            : _NT_TIB
   +0x01c EnvironmentPointer : Ptr32 Void
   +0x020 ClientId         : _CLIENT_ID
   +0x028 ActiveRpcHandle  : Ptr32 Void
   +0x02c ThreadLocalStoragePointer : Ptr32 Void
   +0x030 ProcessEnvironmentBlock : Ptr32 _PEB
   +0x034 LastErrorValue   : Uint4B
   +0x038 CountOfOwnedCriticalSections : Uint4B
   +0x03c CsrClientThread  : Ptr32 Void
   +0x040 Win32ThreadInfo  : Ptr32 Void
   +0x044 User32Reserved   : [26] Uint4B
   +0x0ac UserReserved     : [5] Uint4B
   +0x0c0 WOW32Reserved    : Ptr32 Void
   +0x0c4 CurrentLocale    : Uint4B
   +0x0c8 FpSoftwareStatusRegister : Uint4B
   +0x0cc SystemReserved1  : [54] Ptr32 Void
   +0x1a4 ExceptionCode    : Int4B
   +0x1a8 ActivationContextStack : _ACTIVATION_CONTEXT_STACK
   +0x1bc SpareBytes1      : [24] UChar
   +0x1d4 GdiTebBatch      : _GDI_TEB_BATCH
   +0x6b4 RealClientId     : _CLIENT_ID
   +0x6bc GdiCachedProcessHandle : Ptr32 Void
   +0x6c0 GdiClientPID     : Uint4B
   +0x6c4 GdiClientTID     : Uint4B
   +0x6c8 GdiThreadLocalInfo : Ptr32 Void
   +0x6cc Win32ClientInfo  : [62] Uint4B
   +0x7c4 glDispatchTable  : [233] Ptr32 Void
   +0xb68 glReserved1      : [29] Uint4B
   +0xbdc glReserved2      : Ptr32 Void
   +0xbe0 glSectionInfo    : Ptr32 Void
   +0xbe4 glSection        : Ptr32 Void
   +0xbe8 glTable          : Ptr32 Void
   +0xbec glCurrentRC      : Ptr32 Void
   +0xbf0 glContext        : Ptr32 Void
   +0xbf4 LastStatusValue  : Uint4B
   +0xbf8 StaticUnicodeString : _UNICODE_STRING
   +0xc00 StaticUnicodeBuffer : [261] Uint2B
   +0xe0c DeallocationStack : Ptr32 Void
   +0xe10 TlsSlots         : [64] Ptr32 Void
   +0xf10 TlsLinks         : _LIST_ENTRY
   +0xf18 Vdm              : Ptr32 Void
   +0xf1c ReservedForNtRpc : Ptr32 Void
   +0xf20 DbgSsReserved    : [2] Ptr32 Void
   +0xf28 HardErrorsAreDisabled : Uint4B
   +0xf2c Instrumentation  : [16] Ptr32 Void
   +0xf6c WinSockData      : Ptr32 Void
   +0xf70 GdiBatchCount    : Uint4B
   +0xf74 InDbgPrint       : UChar
   +0xf75 FreeStackOnTermination : UChar
   +0xf76 HasFiberData     : UChar
   +0xf77 IdealProcessor   : UChar
   +0xf78 Spare3           : Uint4B
   +0xf7c ReservedForPerf  : Ptr32 Void
   +0xf80 ReservedForOle   : Ptr32 Void
   +0xf84 WaitingOnLoaderLock : Uint4B
   +0xf88 Wx86Thread       : _Wx86ThreadState
   +0xf94 TlsExpansionSlots : Ptr32 Ptr32 Void
   +0xf98 ImpersonationLocale : Uint4B
   +0xf9c IsImpersonating  : Uint4B
   +0xfa0 NlsCache         : Ptr32 Void
   +0xfa4 pShimData        : Ptr32 Void
   +0xfa8 HeapVirtualAffinity : Uint4B
   +0xfac CurrentTransactionHandle : Ptr32 Void
   +0xfb0 ActiveFrame      : Ptr32 _TEB_ACTIVE_FRAME
   +0xfb4 SafeThunkCall    : UChar
   +0xfb5 BooleanSpare     : [3] UChar

偏移说明

030 PEB结构地址（进程结构）

在用户层下，经常使用

fs:[0x30]来获取PEB，从而可以修改进程链表或枚举进程加载模块等等。

在内核层中，FS指向 KPCR（Kernel's Processor Control Region）

!_KPCR
   +0x000 NtTib            : _NT_TIB
   +0x01c SelfPcr          : Ptr32 _KPCR
   +0x020 Prcb             : Ptr32 _KPRCB
   +0x024 Irql             : UChar
   +0x028 IRR              : Uint4B
   +0x02c IrrActive        : Uint4B
   +0x030 IDR              : Uint4B
   +0x034 KdVersionBlock   : Ptr32 Void
   +0x038 IDT              : Ptr32 _KIDTENTRY
   +0x03c GDT              : Ptr32 _KGDTENTRY
   +0x040 TSS              : Ptr32 _KTSS
   +0x044 MajorVersion     : Uint2B
   +0x046 MinorVersion     : Uint2B
   +0x048 SetMember        : Uint4B
   +0x04c StallScaleFactor : Uint4B
   +0x050 DebugActive      : UChar
   +0x051 Number           : UChar
   +0x052 Spare0           : UChar
   +0x053 SecondLevelCacheAssociativity : UChar
   +0x054 VdmAlert         : Uint4B
   +0x058 KernelReserved   : [14] Uint4B
   +0x090 SecondLevelCacheSize : Uint4B
   +0x094 HalReserved      : [16] Uint4B
   +0x0d4 InterruptMode    : Uint4B
   +0x0d8 Spare1           : UChar
   +0x0dc KernelReserved2 : [17] Uint4B
   +0x120 PrcbData         : _KPRCB

其中KPRCB结构

nt!_KPRCB
   +0x000 MinorVersion     : Uint2B
   +0x002 MajorVersion     : Uint2B
   +0x004 CurrentThread    : Ptr32 _KTHREAD //当前线程
   +0x008 NextThread       : Ptr32 _KTHREAD
   +0x00c IdleThread       : Ptr32 _KTHREAD
   +0x010 Number           : Char
   +0x011 Reserved         : Char
   +0x012 BuildType        : Uint2B
   +0x014 SetMember        : Uint4B
   +0x018 CpuType          : Char
   +0x019 CpuID            : Char
   +0x01a CpuStep          : Uint2B
   +0x01c ProcessorState   : _KPROCESSOR_STATE
   +0x33c KernelReserved   : [16] Uint4B
   +0x37c HalReserved      : [16] Uint4B
   +0x3bc PrcbPad0         : [92] UChar
   +0x418 LockQueue        : [16] _KSPIN_LOCK_QUEUE
   +0x498 PrcbPad1         : [8] UChar
   +0x4a0 NpxThread        : Ptr32 _KTHREAD
   +0x4a4 InterruptCount   : Uint4B
   +0x4a8 KernelTime       : Uint4B
   +0x4ac UserTime         : Uint4B
   +0x4b0 DpcTime          : Uint4B
   +0x4b4 DebugDpcTime     : Uint4B
   +0x4b8 InterruptTime    : Uint4B
   +0x4bc AdjustDpcThreshold : Uint4B
   +0x4c0 PageColor        : Uint4B
   +0x4c4 SkipTick         : Uint4B
   +0x4c8 MultiThreadSetBusy : UChar
   +0x4c9 Spare2           : [3] UChar
   +0x4cc ParentNode       : Ptr32 _KNODE
   +0x4d0 MultiThreadProcessorSet : Uint4B
   +0x4d4 MultiThreadSetMaster : Ptr32 _KPRCB
   +0x4d8 ThreadStartCount : [2] Uint4B
   +0x4e0 CcFastReadNoWait : Uint4B
   +0x4e4 CcFastReadWait   : Uint4B
   +0x4e8 CcFastReadNotPossible : Uint4B
   +0x4ec CcCopyReadNoWait : Uint4B
   +0x4f0 CcCopyReadWait   : Uint4B
   +0x4f4 CcCopyReadNoWaitMiss : Uint4B
   +0x4f8 KeAlignmentFixupCount : Uint4B
   +0x4fc KeContextSwitches : Uint4B
   +0x500 KeDcacheFlushCount : Uint4B
   +0x504 KeExceptionDispatchCount : Uint4B
   +0x508 KeFirstLevelTbFills : Uint4B
   +0x50c KeFloatingEmulationCount : Uint4B
   +0x510 KeIcacheFlushCount : Uint4B
   +0x514 KeSecondLevelTbFills : Uint4B
   +0x518 KeSystemCalls    : Uint4B
   +0x51c SpareCounter0    : [1] Uint4B
   +0x520 PPLookasideList : [16] _PP_LOOKASIDE_LIST
   +0x5a0 PPNPagedLookasideList : [32] _PP_LOOKASIDE_LIST
   +0x6a0 PPPagedLookasideList : [32] _PP_LOOKASIDE_LIST
   +0x7a0 PacketBarrier    : Uint4B
   +0x7a4 ReverseStall     : Uint4B
   +0x7a8 IpiFrame         : Ptr32 Void
   +0x7ac PrcbPad2         : [52] UChar
   +0x7e0 CurrentPacket    : [3] Ptr32 Void
   +0x7ec TargetSet        : Uint4B
   +0x7f0 WorkerRoutine    : Ptr32     void
   +0x7f4 IpiFrozen        : Uint4B
   +0x7f8 PrcbPad3         : [40] UChar
   +0x820 RequestSummary   : Uint4B
   +0x824 SignalDone       : Ptr32 _KPRCB
   +0x828 PrcbPad4         : [56] UChar
   +0x860 DpcListHead      : _LIST_ENTRY
   +0x868 DpcStack         : Ptr32 Void
   +0x86c DpcCount         : Uint4B
   +0x870 DpcQueueDepth    : Uint4B
   +0x874 DpcRoutineActive : Uint4B
   +0x878 DpcInterruptRequested : Uint4B
   +0x87c DpcLastCount     : Uint4B
   +0x880 DpcRequestRate   : Uint4B
   +0x884 MaximumDpcQueueDepth : Uint4B
   +0x888 MinimumDpcRate   : Uint4B
   +0x88c QuantumEnd       : Uint4B
   +0x890 PrcbPad5         : [16] UChar
   +0x8a0 DpcLock          : Uint4B
   +0x8a4 PrcbPad6         : [28] UChar
   +0x8c0 CallDpc          : _KDPC
   +0x8e0 ChainedInterruptList : Ptr32 Void
   +0x8e4 LookasideIrpFloat : Int4B
   +0x8e8 SpareFields0     : [6] Uint4B
   +0x900 VendorString     : [13] UChar
   +0x90d InitialApicId    : UChar
   +0x90e LogicalProcessorsPerPhysicalProcessor : UChar
   +0x910 MHz              : Uint4B
   +0x914 FeatureBits      : Uint4B
   +0x918 UpdateSignature : _LARGE_INTEGER
   +0x920 NpxSaveArea      : _FX_SAVE_AREA
   +0xb30 PowerState       : _PROCESSOR_POWER_STATE