Standard MDL method modifies the properties of page, Nonpage memory

Source: Internet
Author: User
typedef struct _reprotect_context   {       PMDL    Mdl;       PUCHAR LockedVa;  } reprotect_context,  * preprotect_context;       ntstatus   Mmlockvaforwrite (       __in PVOID Va,       __in ULONG  length,       __out PREPROTECT_CONTEXT ReprotectContext       )    {       NTSTATUS Status;          Status = STATUS_SUCCESS;           ReprotectContext->Mdl      = 0;        ReprotectContext->LockedVa = 0;           Reprotectcontext->mdL = IOALLOCATEMDL (           Va,            Length,            false,           FALSE,            0           );           if  (! REPROTECTCONTEXT->MDL)        {            return STATUS_INSUFFICIENT_RESOURCES;       }           //       // Retrieve a locked  va mapping.       //          __try        {       &NBsp;   mmprobeandlockpages (                ReprotectContext->Mdl,                KernelMode,                IoModifyAccess               );        }       __except  (exception_execute_ HANDLER)        {          return  getexceptioncode ();       }           reprotectcontext->lockedva =  (Puchar) mmmaplockedpagesspecifycache (            ReprotectContext->Mdl,            kernelmode,           MmCached,            0,           FALSE,            NormalPagePriority            );          if  (! Reprotectcontext->lockedva)        {                         iofreemdl (               ReprotectContext->Mdl               );               ReprotectContext->Mdl = 0;               return&nbSp status_access_violation;       }          / /       

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