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Listing 336
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0:001> ~ 0 Id: 3edc1970 Suspend: 1 Teb: 7ffdf000 Unfrozen 1 Id: 3edc44e8 Suspend: 1 Teb: 7ffde000 Unfrozen 0:001> ~0s eax=0043de20 ebx=008f0507 ecx=00420000 edx=a4011de2 esi=0007fefc edi=77d491c6 eip=7c90eb94 esp=0007febc ebp=0007fed8 iopl=0 nv up ei pl zr na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246 ntdll!KiFastSystemCallRet: 7c90eb94 c3 ret 0:000> ~ 0 Id: 3edc1970 Suspend: 1 Teb: 7ffdf000 Unfrozen # 1 Id: 3edc44e8 Suspend: 1 Teb: 7ffde000 Unfrozen
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Changing the current thread affects the scope of all the commands dependent on the current thread and is extremely useful for complex commands, such as the kb command or the !teb extension command
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Currently, the kernel debugger does not offer a similar way of altering the execution pattern, such as suspending a thread, resuming a thread, or even scheduling another thread for execution instead of the current one This is not available for multiple reasons, ranging from the complexity of providing such support to the safety of such a mechanism Even more important, such support has limited usefulness in kernel space, as the number of threads is relatively large However, it is possible to simulate this functionality with the support already available in the kernel debugger, provided that several conditions are met The scenario calling for this functionality is presented in the rest of this section We assume that one process of interest stops in the kernel mode debugger as a result of executing a DebugBreak() statement The process cannot continue after the break has been encountered, and any attempt to continue the execution past the breakpoint terminates the process The break is often a direct result of breaking one process invariant, such as heap integrity or perhaps the value of a global variable falling out of the expected range The virtual address space containing break clues is not currently loaded in RAM but is available in the page file The pagein command can be used to bring the necessary pages back into memory The debugger target must run to schedule a thread that will do the actual page-in operation Because of the nondeterministic nature of the page-in process, the former thread causing the break can execute and terminate the process
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A solution to avoid this scenario is stopping the failing thread from executing the termination code by putting it in a waiting state With this thread waiting, pagein can be called countless times without fear of losing the current live debug session The thread can be easily put in a waiting state by changing its current instruction pointer and forcing the thread to execute the kernel32!Sleep API This API takes a single parameter representing the sleep duration in milliseconds The currently running thread stack must be changed to simulate the state before invoking a standard API call with one parameter The context must be changed to match the updated stack pointer, and the instruction pointer must be updated to match the called API start address When the thread continues its execution, it enters into sleep mode for the duration retrieved from the stack, as shown in Listing 337 Listing 337
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kd> r eax=0040136f ebx=7ffdf000 ecx=004011d0 edx=00262649 esi=00000002 edi=00000000 eip=77f75a58 esp=0006fee8 ebp=0006fef0 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000206 ntdll!DbgBreakPoint: 001b:77f75a58 cc int 3 kd> ed esp-4 <time> kd> ed esp-8 kd> resp=@esp-8 kd> reip=kernel32!Sleep kd> pagein <address>;g
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For the entire sleep duration, the debugger can be used to page in multiple pages without fear of losing the process or having the state changed in an unexpected way If necessary, in this state, it is possible to even start a user mode debugger and debug the failing process from within the target system if the system is accessible Regardless of the method used to complete the investigation, the thread returns to its initial location after the timeout has expired Even if registers normally preserved in __stdcall are preserved in this case, the attempt to continue the process execution beyond this point is dangerous
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