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https://github.com/yardenshafir/WinDbg_Scripts
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yardenshafir
57 lines
2.7 KiB
Markdown
57 lines
2.7 KiB
Markdown
# WinDbg_Scripts
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Useful scripts for WinDbg using the debugger data model
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Usage, examples, explanations and general rants (also available in PDF form here):
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https://medium.com/@yardenshafir2/windbg-the-fun-way-part-1-2e4978791f9b </br>
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https://medium.com/@yardenshafir2/windbg-the-fun-way-part-2-7a904cba5435
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## Useful Commands and Syntax
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- <b>__iserror(x)</b>
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Returns true if a statement throws an error.
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```
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dx @$curprocess.Io.Handles.Where(h => !__iserror(h.Type == "File") && h.Type == "File")
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```
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- <b>SelectMany</b>
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Flattens a nested collection, for example runs a query on all threads in all processes and flattens the results
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```
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dx @$cursession.Processes.SelectMany(p => p.Threads.Select(t => t.KernelObject.ThreadName))
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```
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- <b>Conditional Operations</b>
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```
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dx @$curthread.KernelObject.ActiveImpersonationInfo != 0 ? @$curthread.KernelObject.ClientSecurity.ImpersonationLevel : "Not Impersonating"
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```
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- <b>Executing a Legacy Command</b>
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```
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dx @$printSecurityDescriptor = (sd => Debugger.Utility.Control.ExecuteCommand("!sd " + ((__int64)sd).ToDisplayString("x") + " 1"))
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```
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- <b>Cast Pointer to Function Address</b>
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```
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dx @$curprocess.Threads.Select(t => (void(*)())t.KernelObject.StartAddress)
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```
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## String Types and Conversions
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WinDbg uses regular, null terminated strings.
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That can be challenging when trying to compare them with Windows strings, which can be counted strings (ANSI or UNICODE strings) or wide strings.
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To fix that, you can cast Windows strings into "regular" strings with .ToDisplayString:
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- .ToDisplayString("s"): convert a char array (not a wide string) to a string. Outout string will be wrapped in double quotes.
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- .ToDisplayString("sb"): convert a char array (not a wide string) to a string. Outout string will not be wrapped in double quotes.
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- .ToDisplayString("su"): convert a wchar_t array (wide string) to a string. Outout string will be wrapped in double quotes.
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To convert a counted string to a basic string, convert the Buffer field of the counted string using .ToDisplayString(). For example, to convert an ANSI_STRING to a string:
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```
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dx (@$CountedString->Buffer).ToDisplayString("sb")
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```
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As another example, you can create a helper function to compare a user-defined path to the ObjectName field of an OBJECT_ATTRIBUTES structure. ObjectName is a wide string so use .ToDisplayString("su"), and wrap the requested string in double quotes to match the output received from .ToDisplayString("su").
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In this helper function, the two arguments are:
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- o: a pointer to an OBJECT_ATTRIBUTES structure
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- p: a string to be compared to the ObjectName field of the OBJECT_ATRIBUTES structure passed in argument o
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```
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dx @$comparePathFromObjAttr = ((o, p) => (((nt!_OBJECT_ATTRIBUTES*)o)->ObjectName->Buffer).ToDisplayString("su") == "\"" + p + "\"")
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```
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