MmExtendSection

NTSTATUS __stdcall MmExtendSection(PVOID SectionToExtend, UINT64 *NewSectionSize, UINT64 IgnoreFileSizeChecking){
  int v3; 
  _CONTROL_AREA *v6; 
  __int64 v7; 
  __int64 v8; 
  UINT64 v9; 
  UINT64 v10; 
  int v11; 
  _SUBSECTION *LastSubsection; 
  unsigned __int64 v13; 
  unsigned __int64 v14; 
  int updated; 
  UINT64 v16; 
  _FILE_OBJECT *v18; 
  _FILE_OBJECT *v19; 
  NTSTATUS v20; 
  _ETHREAD *CurrentThread; 
  union _LARGE_INTEGER *v22; 
  UINT64 v23; 
  __int128 v24[2]; 
  __int64 v25; 
  union _LARGE_INTEGER FileSize; 
  ULONG_PTR BugCheckParameter2; 
  FileSize.QuadPart = 0i64;
  v3 = IgnoreFileSizeChecking;
  memset(v24, 0, sizeof(v24));
  v25 = 0i64;
  v6 = MiSectionControlArea((_SECTION *)SectionToExtend);
  v7 = (__int64)v6;
  if( (*((_DWORD *)v6 + 14) & 0x420) != 0 || !*((_QWORD *)v6 + 8) )
    return -1073741689;
  if( *NewSectionSize <= 0x3FFFFFFFFFF000i64 )
  {
    v8 = *(_QWORD *)v6;
    v9 = *NewSectionSize + 4095;
    DWORD2(v24[0]) = 16;
    v10 = v9 >> 12;
    MiLockControlAreaSectionExtend(v6);
    if( (*(_DWORD *)(v7 + 56) & 0x8000) == 0 )
    {
      v23 = *((_QWORD *)SectionToExtend + 6);
      if( *NewSectionSize <= v23 )
      {
        *NewSectionSize = v23;
        MiUnlockControlAreaSectionExtend(v7, (__int64)v24);
        return 0;
      }
    }
    if( v3 )
      goto LABEL_6;
    MiUnlockControlAreaSectionExtend(v7, (__int64)v24);
    v18 = MiReferenceControlAreaFile((_CONTROL_AREA *)v7);
    DWORD2(v24[0]) = 32;
    v19 = v18;
    MiLockControlAreaSectionExtend((PVOID)v7);
    v11 = FsRtlGetFileSize(v19, &FileSize);
    if( v11 >= 0 )
    {
      if( *NewSectionSize <= FileSize.QuadPart )
      {
LABEL_18:
        if( *(_QWORD *)(v8 + 32) )
        {
          CurrentThread = (_ETHREAD *)KeGetCurrentThread();
          --*((_WORD *)CurrentThread + 243);
          ExAcquirePushLockExclusiveEx((UINT64)&qword_140C4C6D0, 0i64);
          v22 = *(union _LARGE_INTEGER **)(v8 + 32);
          if( v22 )
            *v22 = FileSize;
          if( (_InterlockedExchangeAdd64((volatile signed __int64 *)&qword_140C4C6D0, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
            ExfTryToWakePushLock((volatile INT64 *)&qword_140C4C6D0);
          KeAbPostRelease(&qword_140C4C6D0);
          KiLeaveGuardedRegionUnsafe((__int64)CurrentThread);
        }
        MiUnlockControlAreaSectionExtend(v7, (__int64)v24);
        MiDereferenceControlAreaFile(v7, (unsigned __int64)v19);
        DWORD2(v24[0]) = 16;
        MiLockControlAreaSectionExtend((PVOID)v7);
LABEL_6:
        v11 = 0;
        BugCheckParameter2 = 0i64;
        LastSubsection = MiFindLastSubsection((_CONTROL_AREA *)v7, 0i64);
        v13 = *(unsigned int *)(v8 + 8) | ((unsigned __int64)(*(_WORD *)(v8 + 12) & 0x3FF) << 32);
        if( v10 <= v13 )
        {
          *((_QWORD *)SectionToExtend + 6) = *NewSectionSize;
          if( _InterlockedCompareExchange64((volatile signed __int64 *)(v8 + 24), -1i64, -1i64) < *NewSectionSize )
          {
            _InterlockedExchange64((volatile __int64 *)(v8 + 24), *NewSectionSize);
            MiUpdateLastSubsectionSize((__int64)LastSubsection, NewSectionSize, 0);
          }
        }
        else
        {
          v14 = v10 - v13;
          if( v14 <= (*((_DWORD *)LastSubsection + 13) & 0x3FFFFFFFu) )
          {
            if( MiControlAreaUsingExtents(v7) && *((_QWORD *)LastSubsection + 1) )
            {
              MiSubsectionNeedsExtents(LastSubsection);
              BugCheckParameter2 = (ULONG_PTR)LastSubsection;
            }
            updated = MiUpdateLastSubsectionSize((__int64)LastSubsection, NewSectionSize, v14);
          }
          else
          {
            updated = MiExtendSection(
                        (__int64)LastSubsection,
                        NewSectionSize,
                        *((_DWORD *)LastSubsection + 13) & 0x3FFFFFFF,
                        v14 - (*((_DWORD *)LastSubsection + 13) & 0x3FFFFFFF),
                        &BugCheckParameter2);
          }
          v11 = updated;
          if( updated >= 0 )
          {
            v11 = 0;
            _InterlockedExchange64((volatile __int64 *)(v8 + 24), *NewSectionSize);
            *((_QWORD *)SectionToExtend + 6) = *NewSectionSize;
          }
        }
        MiUnlockControlAreaSectionExtend(v7, (__int64)v24);
        if( BugCheckParameter2 )
          return MiUpdateActiveSubsection((_SUBSECTION *)BugCheckParameter2, v16);
        return v11;
      }
      if( (*((_DWORD *)SectionToExtend + 15) & 0x44) != 0 )
      {
        FileSize.QuadPart = *NewSectionSize;
        v20 = FsRtlSetFileSize(v19, &FileSize);
        if( v20 >= 0 )
          goto LABEL_18;
        v11 = v20;
      }
      else
      {
        v11 = -1073741689;
      }
    }
    MiUnlockControlAreaSectionExtend(v7, (__int64)v24);
    MiDereferenceControlAreaFile(v7, (unsigned __int64)v19);
    return v11;
  }
  return -1073741760;
}

Referenced by: