Exception dispatched to the user mode debugger in Software

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Listing 319
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Exception dispatched to the user mode debugger
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ParentCid: 0a70 7
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kd> !process 0 4 02sampleexe PROCESS ff68a020 SessionId: 0 Cid: 0a7c Peb: 7ffdd000 DirBase: 03912000 ObjectTable: e180e158 HandleCount: Image: 02sampleexe THREAD ffa7d868 Cid 0a7c0a78
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Teb: 7ffdf000 Win32Thread: 00000000 WAIT
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kd> !thread ffa7d868 THREAD ffa7d868 Cid 0a7c0a78 Teb: 7ffdf000 Win32Thread: 00000000 WAIT: (Executive) KernelMode Non-Alertable SuspendCount 1 f7cf3490 SynchronizationEvent Not impersonating DeviceMap e19f85a0 Owning Process ff68a020 Image: 02sampleexe Wait Start TickCount 14796478 Ticks: 1035 (0:00:00:10364) Context Switch Count 44 UserTime 00:00:000000 KernelTime 00:00:000290 Win32 Start Address 02sample!mainCRTStartup (0x0040183d) Start Address kernel32!BaseProcessStartThunk (0x7c810867) Stack Init f7cf4000 Current f7cf3414 Base f7cf4000 Limit f7cf1000 Call 0 Priority 10 BasePriority 8 PriorityDecrement 0 DecrementCount 16 ChildEBP RetAddr Args to Child f7cf342c 804dc6a6 ffa7d8d8 ffa7d868 804dc6f2 nt!KiSwapContext+0x2e () f7cf3438 804dc6f2 00000000 ffa7d868 f7cf3488 nt!KiSwapThread+0x46
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3 DEBUGGERS UNCOVERED
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(continues)
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3
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Debuggers Uncovered
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Listing 319 Exception dispatched to the user mode debugger (continued)
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f7cf3460 8065879b 00000000 00000000 00000000 nt!KeWaitForSingleObject+0x1c2 f7cf3540 80659903 ff68a020 00000000 f7cf3578 nt!DbgkpQueueMessage+0x17c f7cf3564 8060fed2 f7cf3578 00000001 f7cf3d64 nt!DbgkpSendApiMessage+0x45 f7cf35f0 804fc914 f7cf39d8 00000001 00000000 nt!DbgkForwardException+0x8f f7cf39b0 804fcbfe f7cf39d8 00000000 f7cf3d64 nt!KiDispatchException+0x1f4 f7cf3d34 804e297d 0006fe48 0006fb64 00000000 nt!KiRaiseException+0x175 f7cf3d50 804df06b 0006fe48 0006fb64 00000001 nt!NtRaiseException+0x31 f7cf3d50 7c81eb33 0006fe48 0006fb64 00000001 nt!KiFastCallEntry+0xf8 (TrapFrame @ f7cf3d64) 0006fe98 77c2272c e06d7363 00000001 00000003 kernel32!RaiseException+0x53 0006fed8 004012c5 0006feec 00401d38 004012b0 msvcrt!_CxxThrowException+0x36 0006fef0 00401471 00011970 7c9118f1 7ffdd000 02sample!RaiseCPP+0x25 0006ff44 0040196c 00000002 00262588 00262a58 02sample!wmain+0xe1 0006ffc0 7c816d4f 00011970 7c9118f1 7ffdd000 02sample!mainCRTStartup+0x12f 0006fff0 00000000 0040183d 00000000 78746341 kernel32!BaseProcessStart+0x23 kd> trap f7cf3d64 ErrCode = 00000000 eax=0006fe48 ebx=7ffdd000 ecx=00000000 edx=002625b0 esi=0006fed8 edi=0006fed8 eip=7c81eb33 esp=0006fe44 ebp=0006fe98 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000206 kernel32!RaiseException+0x53: 001b:7c81eb33 5e pop esi kd> k *** Stack trace for last set context - thread/cxr resets it ChildEBP RetAddr 0006fe98 77c2272c kernel32!RaiseException+0x53 0006fed8 004012c5 msvcrt!_CxxThrowException+0x36 0006fef0 00401471 02sample!RaiseCPP+0x25 0006ff44 0040196c 02sample!wmain+0xe1 0006ffc0 7c816d4f 02sample!mainCRTStartup+0x12f 0006fff0 00000000 kernel32!BaseProcessStart+0x23
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The handler uses the trap information and possibly other information retrieved from the processor to create two pieces of information: an exception record, describing the exception encountered and an exception context, containing the state of the processor at the time the processor encountered that exception Please note that the trap frame information (shown in the first kernel function from the previous stack as TrapFrame) captured at the transition into the kernel mode point can be used as context information to the trap command, as shown in Listing 319
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User Mode Debugger Internals
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Software exceptions are initiated by an explicit call into a kernel mode, using the undocumented API ntdll!NtRaiseException called by the public API kernel32! RaiseException ntdll!NtRaiseException creates the exception record and captures the process state in an exception context With the exception record and the exception context, the kernel is ready to dispatch the exception using the exception-dispatching mechanism, similar to the hardware exceptions The dispatching process starts in kernel mode and continues later in user mode or kernel mode, matching the mode active when the exception was encountered All exceptions encountered in kernel mode should be handled; otherwise, that exception causes a bug check (also known as blue screen errors or BSOD), such as the following:
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bug check 0x8E: KERNEL_MODE_EXCEPTION_NOT_HANDLED
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With the exception information captured as described previously, the operating system starts the exception-dispatching routine As part of this routine, the Windows operating system performs several activities, such as
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Attempts to call all registered handlers until the exception is handled Provides additional functionality such as exception logging Ultimately decides what to do with any unhandled exception
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This complex functionality, provided by the Windows operating system, is performed almost silently We use almost because the exception dispatching is relatively expensive when compared to normal code execution As long as no exceptions are raised as part of the normal execution flow, the overall cost of dispatching the exception is negligible
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Exception Dispatching The Windows operating system takes debugger availability into account when an exception is dispatched that is, a user mode debugger attached to the process generating the exception or a kernel mode debugger attached to the system causing the exception The scope of this section is limited to exceptions encountered while executing user mode code When the Windows operating system starts to process user mode exceptions, it first asks the user mode debugger attached to the process, if any, to handle the exception If no debugger is attached to the process, the kernel examines a global flag controlling the
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