четверг, 26 марта 2020 г.

fltmgr.GLOBALS!PerfTraceRoutines

In windows 8 in fltmgr was introduced feature for filter operation Etw logging - structure WMI_FLTIO_NOTIFY_ROUTINES in GLOBALS:
 void  (TimeStampRoutine*)(struct _ETW_KERNEL_TRACE_TIMESTAMP*, unsigned long);
 void  (FailureNotifyRoutine*)(void*, unsigned long, unsigned long, unsigned short);
 void  (InitiationNotifyRoutine*)(void*, unsigned long, unsigned long, unsigned short);
 void  (CompletionNotifyRoutine*)(void*, unsigned long, unsigned long, unsigned short, struct _ETW_KERNEL_TRACE_TIMESTAMP*);

 void  (FastCompletionNotifyRoutine*)(void*, unsigned long, unsigned long, unsigned short, struct _ETW_KERNEL_TRACE_TIMESTAMP*);

in windows 10 new entry was added:
void  (IoRedirectionNotifyRoutine*)(struct _IRP*, struct _FILE_OBJECT*);

This structure initialized in DriverEntry - PerfTraceRoutines assigned address of GLOBALS.DummyPerfTraceRoutines and then called function WmiQueryTraceInformation with class FltIoNotifyRoutinesClass (where this structure filled with content of EtwpFltIoNotifyRoutines)
So patching this functions pointers you can have real-time info about operations in file filters (or perhaps disable Etw logging for them)

On freshly installed system only two pfns are initialized:


[0] TimeStampRoutine: FFFFF80753B2BAC0 \SystemRoot\system32\ntoskrnl.exe
[5] IoRedirectionNotifyRoutine: FFFFF80753E04570 \SystemRoot\system32\ntoskrnl.exe


You can find GLOBALS!PerfTraceRoutines with disasm of exported function FltCompletePendedPostOperation

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