MSSQLWIKI

Karthick P.K on SQL Server

How to check if my account has LPM privilege

Posted by Karthick P.K on July 18, 2010

#include <windows.h> 
#include <string> 
#include <winbase.h> 
#include <iostream> 
using namespace std;
#include <psapi.h>
#pragma comment(lib,"psapi.lib")

void main()
    {

    long int s=0;
    printf("\nThis program will allocate memory using AWE allocator API's");
    printf("\nEnter the size of memory to be allocated using AWE API's:");
    scanf("%d",&s);
    LPVOID lpaddress=NULL; 
    SIZE_T size=s;   
    LPVOID ADD;
    BOOL bResult= FALSE;
    BOOL bResult2= FALSE;
    ULONG_PTR sizemap= (size)*1024*1024/4096;
    
                if( ! LoggedSetLockPagesPrivilege( GetCurrentProcess(), TRUE ) )  //. The SeLockMemoryPrivilege privilege must be enabled in the caller's token or the function will fail with ERROR_PRIVILEGE_NOT_HELD
                  {
                    printf("\n No Previledge");
                    printf("\n Error: %u", GetLastError() );
                      return;
                  }


    ULONG_PTR * aRAMPages = new ULONG_PTR[sizemap];


    ADD=VirtualAlloc(lpaddress,(size*1024*1024),MEM_RESERVE | MEM_PHYSICAL,PAGE_READWRITE);

    
    if (ADD==0)

    {
    printf ("allocation failled");
    printf("\n %u", GetLastError() );
        return;
    }



    bResult=AllocateUserPhysicalPages(GetCurrentProcess(),&sizemap,aRAMPages);

            if( bResult != TRUE ) 
            {
            printf("\n %uError in AllocateUserPhysicalPages", GetLastError() );
            return;
            }

     bResult2=MapUserPhysicalPages(ADD,sizemap,aRAMPages);

            if( bResult != TRUE ) 
            {
            printf("\n %uError in MapUserPhysicalPages", GetLastError() );
            return;
            }
printf("\nAllocated %d MB using AWE allocator API's which SQLServer uses when LPM is enabled.",s  );
system("pause");
}





 
BOOL LoggedSetLockPagesPrivilege ( HANDLE hProcess,BOOL bEnable)
{
  struct {
    DWORD Count;
    LUID_AND_ATTRIBUTES Privilege [1];
  } Info;

  HANDLE Token;
  BOOL Result;

  // Open the token.

  Result = OpenProcessToken ( hProcess,
                              TOKEN_ADJUST_PRIVILEGES,
                              & Token);

  if( Result != TRUE ) 
  {
    printf( "Cannot open process token.\n" );
    return FALSE;
  }

  // Enable or disable?

  Info.Count = 1;
  if( bEnable ) 
  {
    Info.Privilege[0].Attributes = SE_PRIVILEGE_ENABLED;
  } 
  else 
  {
    Info.Privilege[0].Attributes = 0;
  }

  // Get the LUID.

  Result = LookupPrivilegeValue ( NULL,
                                  SE_LOCK_MEMORY_NAME,
                                  &(Info.Privilege[0].Luid));

  if( Result != TRUE ) 
  {
    printf( "Cannot get privilege for %s.\n", SE_LOCK_MEMORY_NAME );
    return FALSE;
  }

  // Adjust the privilege.

  Result = AdjustTokenPrivileges ( Token, FALSE,
                                   (PTOKEN_PRIVILEGES) &Info,
                                   0, NULL, NULL);

  // Check the result.

  if( Result != TRUE ) 
  {
    printf ("Cannot adjust token privileges (%u) Error:", GetLastError() );
    return FALSE;
  } 
  else 
  {
    if( GetLastError() != ERROR_SUCCESS ) 
    {
      
    printf ("\nCannot enable the SE_LOCK_MEMORY_NAME privilege; ");
     printf ("\nPlease check the local policy.\n");
      return FALSE;
    }
  }

  CloseHandle( Token );

  return TRUE;
};




Regards
Karthick P.K

One Response to “How to check if my account has LPM privilege”

  1. […] How to check if my account has LPM privilege […]

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