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[讨论]解锁Irp文件占坑的方法
2023-10-4 20:03 2795

[讨论]解锁Irp文件占坑的方法

ThanatosKer 活跃值
2023-10-4 20:03
2795

先上链接: https://bbs.kanxue.com/thread-257384.htm

1.很简单 只用调用一个函数 NtfsDecrementCleanupCounts这个函数

上代码

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VOID
NtfsDecrementCleanupCounts (
    IN PSCB Scb,
    IN PLCB Lcb OPTIONAL,
    IN BOOLEAN NonCachedHandle
    )
 
/*++
 
Routine Description:
 
    This procedure decrements the cleanup counts for the associated data structures
    and if necessary it also start to cleanup associated internal attribute streams
 
Arguments:
 
    Scb - Supplies the Scb used in this operation
 
    Lcb - Optionally supplies the Lcb used in this operation
 
    NonCachedHandle - Indicates this handle is for a user non-cached handle.
 
Return Value:
 
    None.
 
  翻译：
        此过程减少关联数据结构的清理计数
    如果有必要，它还会开始清理关联的内部属性流
 
论据：
 
    Scb - 提供此操作中使用的 Scb
 
    Lcb - 可选择提供此操作中使用的 Lcb
 
    NonCachedHandle - 指示此句柄用于用户非缓存句柄。
 
--*/
 
{
    PVCB Vcb = Scb->Vcb;
 
    ASSERT_SCB( Scb );
    ASSERT_FCB( Scb->Fcb );
    ASSERT_VCB( Scb->Fcb->Vcb );
    ASSERT_OPTIONAL_LCB( Lcb );
 
    //
    //  First we decrement the appropriate cleanup counts
    //
 
    if (ARGUMENT_PRESENT(Lcb)) { Lcb->CleanupCount -= 1; }
 
    InterlockedDecrement( &Scb->CleanupCount );
    Scb->Fcb->CleanupCount -= 1;
 
    if (NonCachedHandle) {
 
        Scb->NonCachedCleanupCount -= 1;
    }
 
    InterlockedDecrement( &Vcb->CleanupCount );
 
    //
    //  Now if the Fcb's cleanup count is zero that indicates that we are
    //  done with this Fcb from a user handle standpoint and we should
    //  now scan through all of the Scb's that are opened under this
    //  Fcb and shutdown any internal attributes streams we have open.
    //  For example, EAs and ACLs.  We only need to do one.  The domino effect
    //  will take of the rest.
    //
 
    if (Scb->Fcb->CleanupCount == 0) {
 
        PSCB NextScb;
 
        //
        //  Remember if we are dealing with a system file and return immediately.
        //
 
        if (NtfsSegmentNumber( &Scb->Fcb->FileReference ) < FIRST_USER_FILE_NUMBER &&
            NtfsSegmentNumber( &Scb->Fcb->FileReference ) != ROOT_FILE_NAME_INDEX_NUMBER) {
 
            return;
        }
 
        for (NextScb = CONTAINING_RECORD(Scb->Fcb->ScbQueue.Flink, SCB, FcbLinks);
             &NextScb->FcbLinks != &Scb->Fcb->ScbQueue;
             NextScb = CONTAINING_RECORD( NextScb->FcbLinks.Flink, SCB, FcbLinks )) {
 
            //
            //  Skip the root index on the volume.
            //
 
            if (SafeNodeType( NextScb ) == NTFS_NTC_SCB_ROOT_INDEX) {
 
                continue;
            }
 
            //
            //  If we have an index with children then break out.
            //
 
            if ((SafeNodeType( NextScb ) == NTFS_NTC_SCB_INDEX) &&
                !IsListEmpty( &NextScb->ScbType.Index.LcbQueue )) {
 
                break;
            }
 
            //
            //  If there is an internal stream then dereference it and get out.
            //
 
            if (NextScb->FileObject != NULL) {
 
                NtfsDeleteInternalAttributeStream( NextScb,
                                                   (BOOLEAN) (Scb->Fcb->LinkCount == 0) );
                break;
            }
        }
    }
 
    //
    //  And return to our caller
    //
 
    return;
}

IDA 的代码显示 win7x64 ntfs.sys NtfsDecrementCleanupCounts 函数

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__int64 __fastcall NtfsDecrementCleanupCounts(__int64 a1, __int64 a2, __int64 a3, __int64 a4, int a5)
{
  __int64 v5; // r10
  __int64 result; // rax
  __int64 v8; // rcx
  unsigned __int16 *v9; // rdx
  __int64 v10; // rdx
 
  v5 = *(_QWORD *)(a2 + 0x78);
  if ( a3 )
    --*(_DWORD *)(a3 + 0xCC);
  if ( (*(_BYTE *)(*(_QWORD *)(a2 + 112) + 4i64) & 4) != 0 )
    return ((__int64 (__fastcall *)(__int64, __int64, __int64, __int64))sub_2A1A4)(a1, a2, a3, a4);
  _InterlockedAdd((volatile signed __int32 *)(a2 + 0x88), 0xFFFFFFFF);
  result = *(_QWORD *)(a2 + 0x70);
  _InterlockedAdd((volatile signed __int32 *)(result + 0x10), 0xFFFFFFFF);
  if ( (_DWORD)a4 )
    --*(_DWORD *)(a2 + 0x84);
  if ( a5 )
  {
    result = *(_QWORD *)(a2 + 0x70);
    --*(_DWORD *)(result + 0xEC);
  }
  _InterlockedAdd((volatile signed __int32 *)(v5 + 0xD8), 0xFFFFFFFF);
  v8 = *(_QWORD *)(a2 + 112);
  if ( !*(_DWORD *)(v8 + 16) )
  {
    v9 = 0i64;
    if ( (((unsigned int)&loc_200FF + 1) & *(_DWORD *)(v8 + 4)) == 0 || *(_DWORD *)(v8 + 8) == 5 )
    {
      while ( 1 )
      {
        v10 = v9 ? *((_QWORD *)v9 + 12) : *(_QWORD *)(v8 + 48);
        result = v8 + 48;
        if ( v10 == v8 + 48 )
          break;
        v9 = (unsigned __int16 *)(v10 - 96);
        if ( !v9 )
          break;
        result = *v9;
        if ( (_WORD)result != 1796 && *((_DWORD *)v9 + 43) != 32 )
        {
          if ( *((_DWORD *)v9 + 34) )
            return result;
          if ( (_WORD)result == 1795 )
          {
            result = (__int64)(v9 + 252);
            if ( *(_QWORD *)result != result )
              return result;
          }
          if ( *((_QWORD *)v9 + 24) && !_bittest((const signed __int32 *)v9 + 32, 0xAu) )
            return ((__int64 (__fastcall *)(__int64, unsigned __int16 *, bool, _QWORD))NtfsDeleteInternalAttributeStream)(
                     a1,
                     v9,
                     *(_WORD *)(v8 + 164) == 0,
                     0i64);
        }
      }
    }
  }
  return result;
}

3. 我的代码

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typedef VOID(*__fastcall pNtfsDecrementCleanupCounts)(__int64 a1, __int64 a2, __int64* a3, int a4, int a5);
pNtfsDecrementCleanupCounts NtfsDecrementCleanupCounts = NULL;
/*****************************************************************************
* @FunctionName : brief
* @Author : Thanatos
* @Date : 2023/10/4 19:38
* @Inparam : WCHAR* szPath 路径
* @Outparam :
*****************************************************************************/
NTSTATUS TestXCBFunction(WCHAR* szPath)
{
    NtfsDecrementCleanupCounts = 0xFFFFF88001261660;
     
 
    IO_STATUS_BLOCK ioStatus;
 
 
    HANDLE handle;
 
    WCHAR tmppath[MAX_PATH] = { 0 };
 
    wcscpy(tmppath, L"\\??\\");
    wcscat(tmppath, szPath);
 
 
    UNICODE_STRING uDeletePathName;
    RtlInitUnicodeString(&uDeletePathName, tmppath);
 
 
    OBJECT_ATTRIBUTES                 objAttributes = { 0 };
    InitializeObjectAttributes(&objAttributes, &uDeletePathName, OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE, NULL, NULL);
 
 
    NTSTATUS ntStatus = ZwCreateFile(
        &handle,
        SYNCHRONIZE | FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES,
        &objAttributes,
        &ioStatus,
        NULL,
        FILE_ATTRIBUTE_NORMAL,
        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
        FILE_OPEN,
        FILE_SYNCHRONOUS_IO_NONALERT,
        NULL,
        0);
    if (NT_SUCCESS(ntStatus))
    {
        PFILE_OBJECT FileObject;
 
        ntStatus = ObReferenceObjectByHandle(handle,
            DELETE,
            *IoFileObjectType,
            KernelMode,
            &FileObject,
            NULL);
 
        if (!NT_SUCCESS(ntStatus))
        {
            ZwClose(handle);
            return ntStatus;
        }
 
 
        if (MmIsAddressValid(NtfsDecrementCleanupCounts))
        {
 
            PVOID pSCB = FileObject->FsContext;
            PVOID pCCB = FileObject->FsContext2;
 
            NtfsDecrementCleanupCounts(0, pSCB, 0, FileObject->Flags & 8, 0);
 
        }
        else
        {
            ntStatus = STATUS_INVALID_PARAMETER;
        }
 
 
        ObDereferenceObject(FileObject);
 
        ZwClose(handle);
 
 
 
 
 
    }
 
    kprintf("ntStatus %ws %x\n", szPath, ntStatus);
    return ntStatus;
}

第一次写。。。不知道怎么去描述


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