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Windows Debuggers The Windows debuggers can generate dumps of different sizes and enable full control of the dump file generation process ADPlus ADPlus is a tool that is part of Debugging Tools for Windows It acts as a process monitor capable of generating dump files whenever a crash or hang occurs Additionally, it has a notification mechanism that can notify the user of a crash
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Windows Error Reporting is a service Microsoft provides that allows customers to register with a live error reporting site Any time a crash occurs in one of the applications owned by a particular customer, an error report is sent from the crashing machine to the Windows Error Reporting Web site The crash information (including dump file) can be retrieved from the WER service analyzed by the customer postmortem Corporate Error Reporting works on the same basis as the Windows Error Reporting, although at a corporate server level rather than sending crash information over the Internet Customers can set up a Corporate Error Server and send crash information to this server Subsequently, crash information can be sent to the Windows Error Reporting site
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13 POSTMORTEM DEBUGGING
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In this section, we cover how to generate dump files using the Windows Debuggers and ADPlus Windows Error Reporting and Corporate Error Reporting mechanisms are discussed later in the chapter To better illustrate the dump file generation process, we use a simple application that allocates memory on the heap, writes to that memory, and then faults Listing 131 shows the code for the sample application Listing 131
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void __cdecl wmain ( ) { WCHAR* pszTitle=L Advanced Windows Debugging ; wprintf(L Press any key to start\n ); WCHAR* pBuffer=(WCHAR*) new WCHAR[wcslen(pszTitle)+1]; if(pBuffer) { StringCchCopy(pBuffer, wcslen(pszTitle)+1, pszTitle); wprintf(L Title: %s\n , pBuffer); pBuffer=NULL; *pBuffer= \0 ; } else {
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Listing 131
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wprintf(L Failed to allocate memory\n ); } wprintf(L Press any key to end\n ); __getch(); }
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The source of the crash should be pretty evident After we copied the string to the newly allocated heap buffer, the string pointer is reset to null and subsequently used when null terminating the buffer, leading to a crash We will start by illustrating how to use the debuggers to generate a dump file
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As noted earlier, the application we will be using is illustrated in Listing 131 The compiled version can be found in the following location: Source code: C:\AWD\13 Binary: C:\AWDBIN\WinXPx86chk\awdscenario1exe Run the application under the debugger and continue execution until the crash occurs
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ModLoad: 5cb70000 5cb96000 C:\WINDOWS\system32\ShimEngdll Press any key to start Title: Advanced Windows Debugging (9d8f0c): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling This exception may be expected and handled eax=00000000 ebx=7ffd5000 ecx=77c418bf edx=77c61b78 esi=7c9118f1 edi=00011970 eip=0100127e esp=0007ff1c ebp=0007ff44 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202 awdscenario1!wmain+0xbe: 0100127e c60000 mov byte ptr [eax],0 ds:0023:00000000= 0:000> kb ChildEBP RetAddr Args to Child 0007ff44 01001495 00000001 00032bf0 00036890 awdscenario1!wmain+0xbe 0007ffc0 7c816fd7 00011970 7c9118f1 7ffd5000 awdscenario1!wmainCRTStartup+0x12f 0007fff0 00000000 01001366 00000000 78746341 kernel32!BaseProcessStart+0x23
Not too surprisingly, we crash because of a second-chance access violation At this point, we would like to generate a dump file for further postmortem analysis The single
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biggest question with generating dump files is how much information to include As a general rule of thumb, the more state that is stored in the dump file, the more information you will have at your disposal when doing postmortem debugging The biggest limiting factor is the size of the dump file You might find yourself in environments in which getting a huge dump file from a highly secure server is not feasible, and you might need to work with a stripped down version The means by which a dump file is generated is using the dump command The dump /m option indicates to the debugger that it should generate a mini dump file Additionally, the dump /m command can take a number of other options, as detailed in Table 132 Table 132