Debugging Scenarios in Software

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The kernel debugger is the best option in this scenario, and the easiest option is to just redirect the debugger console into the kernel debugger The image file execution option is changed, as explained before, to use a different debugger command line, ntsd -d
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HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ myServiceexe] Debugger = c:\\debugx86\\ntsdexe d
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In several cases, the process name is not a good discriminator, as in the case of modules loaded by DllHostexe, and you want to be able to debug only your module In this case, the debugger accepts a few commands from the command line, asking the debugger to stop on the initial breakpoint (don t use the g option), to raise an exception on the module load, and to continue the execution If the shared host never loads our module, the breakpoint is never hit and the system runs normally
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HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ dllhostexe] Debugger = c:\\debugx86\\ntsdexe d G c sxe ld <mymodule>;g
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2 INTRODUCTION TO THE DEBUGGERS
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When no kernel debugger is connected to the target system, the system can be debugged using the user mode debugger s remote capabilities A debugger in server mode is used as a debugger parameter in IFEO
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HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ dllhostexe] Debugger = c:\debugx86\ntsdexe -server tcp:port=6000 -G
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The client connects to the debug server, after the server process was started, using a specific connection string
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C:\>windbg -remote tcp:port=6000,server=localhost
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This method does not work well when the debugger target implements a Windows service and the debugger exits without warning shortly after starting the debugging session That is Service Control Manager, also known as SCM, standard behavior if the
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2
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Introduction to the Debuggers
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service does not communicate the starting status back to it in 30 seconds Fortunately, this limit can be changed by modifying one registry setting, as shown here:
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control ServicesPipeTimeout = NewTimeoutInMiliseconds
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What happens if the service is started multiple times on the system, as is the case for the dllhostexe process Since each debugger instance opens the specified endpoint, only the first process will start normally under the debugger; all the other instances will fail when the debugger tries to open the endpoint and start the debugger server The solution is to defer the debugger server initialization until the target process loading that module is identified The option of specifying a command to be executed when the debugger prompts the user allows us to send the command to break the execution when the specific DLL is loaded and only then starts the remote server
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HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ dllhostexe] Debugger = c:\\debugx86\\ntsdexe d G c sxe ld <mymodule>;g;server tcp:port=6000
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All techniques described here can be combined with the CLICON option mentioned in the TCP section to better synchronize the debugger server with the debugger client When multiple processes share the same IEFO key and all processes must be debugged using debugger servers, the endpoint must be dynamically created, but names must be predictable The named pipe name can be autogenerated by the debugger, as shown in Listing 245, with a discoverable name that is used later on the debugger client The next listing represents the registry value causing each dllhostexe process to start a named pipe debugger server, using the pipe name \\\pipe\dllHost_xyz
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HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ dllhostexe] Debugger = c:\debugx86\ntsdexe d G c server npipe:pipe=dllHost_%i;g
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Summary
Summary
The Windows debuggers are powerful tools that can be used to troubleshoot software problems throughout the whole software life cycle In the initial development phase, the debuggers are used to validate the correctness of the code, usually with the source code available Later, after the code is deployed, the software developers debug the dump files generated each time the application crashes on the user system Because of their flexibility, the Windows debuggers can be used in various combinations and can be extended to maximize the productivity of all engineers involved in the development process To effectively use the debugger, the user should have a good grasp of some basic commands and must be willing to learn new commands or options, as required by the debugging scenario at hand The next chapters introduce additional commands as required by the chapter scenarios