Windows 8 上的 DLL 加载计数

Question

有谁知道 LDR_MODULE.LoadCount 在 Windows 8 上的位置？

以下代码始终打印 6 作为引用计数：S 我使用 RemoteDLLTool 检查过，基地址和所有其他信息都是正确的。然而，LoadCount 是错误的，因为它总是 6。我读到，如果它是 6，则意味着 DLL 是动态加载的，如果它是 -1，则它是静态的。

还有一种方法可以迭代链表，而不必不断读取进程内存？

我需要以某种方式计算出引用计数。基本上，Windows 7 上的下面的代码会告诉我 DLL 被加载了多少次。又名 DLL 的引用计数。

#include <winternl.h>

typedef struct _LDR_MODULE
{
    LIST_ENTRY              InLoadOrderModuleList;
    LIST_ENTRY              InMemoryOrderModuleList;
    LIST_ENTRY              InInitializationOrderModuleList;
    PVOID                   BaseAddress;
    PVOID                   EntryPoint;
    ULONG                   SizeOfImage;
    UNICODE_STRING          FullDllName;
    UNICODE_STRING          BaseDllName;
    ULONG                   Flags;
    SHORT                   LoadCount;
    SHORT                   TlsIndex;
    LIST_ENTRY              HashTableEntry;
    ULONG                   TimeDateStamp;
} LDR_MODULE, *PLDR_MODULE;

int GetModuleLoadCount()
{
    DWORD dwBytesRead = 0;
    PROCESS_BASIC_INFORMATION PBI = {0};
    HANDLE ProcessHandle = GetCurrentProcess();

    if (NT_SUCCESS(NtQueryInformationProcess(ProcessHandle, ProcessBasicInformation, &PBI, sizeof(PBI), &dwBytesRead)))
    {
        PEB_LDR_DATA LdrData;
        LDR_MODULE LdrModule;
        PPEB_LDR_DATA pLdrData = nullptr;
        PLDR_MODULE pLdrModule = nullptr;

        char* LdrDataOffset = reinterpret_cast<char*>(PBI.PebBaseAddress) + offsetof(PEB, Ldr);
        ReadProcessMemory(ProcessHandle, LdrDataOffset, &pLdrData, sizeof(pLdrData), &dwBytesRead);
        ReadProcessMemory(ProcessHandle, pLdrData, &LdrData, sizeof(LdrData), &dwBytesRead);

        LIST_ENTRY* Head = LdrData.InMemoryOrderModuleList.Flink;
        LIST_ENTRY* Next = Head;

        do
        {
            LDR_DATA_TABLE_ENTRY LdrEntry;
            LDR_DATA_TABLE_ENTRY* Base = CONTAINING_RECORD(Head, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);

            if (ReadProcessMemory(ProcessHandle, Base, &LdrEntry, sizeof(LdrEntry), &dwBytesRead))
            {
                char* pLdrModuleOffset = reinterpret_cast<char*>(Head) - sizeof(LIST_ENTRY);
                ReadProcessMemory(ProcessHandle, pLdrModuleOffset, &pLdrModule, sizeof(pLdrModule), &dwBytesRead);
                ReadProcessMemory(ProcessHandle, pLdrModule, &LdrModule, sizeof(LdrModule), &dwBytesRead);

                if (LdrEntry.DllBase)
                {
                    std::cout<<"BaseAddress:     "<< LdrModule.BaseAddress<<std::endl;
                    std::cout<<"Reference Count: "<< LdrModule.LoadCount<<std::endl;
                }

                Head = LdrEntry.InMemoryOrderLinks.Flink;
            }
        }
        while (Head != Next);
    }
    CloseHandle(ProcessHandle);
    return 0;
}

关于如何在 Windows 8 上执行相同操作有什么想法吗？

Answer 1

在 Windows 8.1 上测试。不保证这将在较新的 Windows 上运行（例如 10，但是 - 根据文档应该可以运行）

#include <winternl.h>                   //PROCESS_BASIC_INFORMATION


// warning C4996: 'GetVersionExW': was declared deprecated
#pragma warning (disable : 4996)
bool IsWindows8OrGreater()
{
    OSVERSIONINFO ovi = { 0 };
    ovi.dwOSVersionInfoSize = sizeof( OSVERSIONINFO );

    GetVersionEx(&ovi);

    if( (ovi.dwMajorVersion == 6 && ovi.dwMinorVersion >= 2) || ovi.dwMajorVersion > 6 )
        return true;

    return false;
} //IsWindows8OrGreater
#pragma warning (default : 4996)



bool ReadMem( void* addr, void* buf, int size )
{
    BOOL b = ReadProcessMemory( GetCurrentProcess(), addr, buf, size, nullptr );
    return b != FALSE;
}

#ifdef _WIN64
    #define BITNESS 1
#else
    #define BITNESS 0
#endif

typedef NTSTATUS (NTAPI *pfuncNtQueryInformationProcess)(HANDLE,PROCESSINFOCLASS,PVOID,ULONG,PULONG);

//
//  Queries for .dll module load count, returns 0 if fails.
//
int GetModuleLoadCount( HMODULE hDll )
{
    // Not supported by earlier versions of windows.
    if( !IsWindows8OrGreater() )
        return 0;

    PROCESS_BASIC_INFORMATION pbi = { 0 };

    HMODULE hNtDll = LoadLibraryA("ntdll.dll");
    if( !hNtDll )
        return 0;

    pfuncNtQueryInformationProcess pNtQueryInformationProcess = (pfuncNtQueryInformationProcess)GetProcAddress( hNtDll, "NtQueryInformationProcess");
    bool b = pNtQueryInformationProcess != nullptr;
    if( b ) b = NT_SUCCESS(pNtQueryInformationProcess( GetCurrentProcess(), ProcessBasicInformation, &pbi, sizeof( pbi ), nullptr ));
    FreeLibrary(hNtDll);

    if( !b )
        return 0;

    char* LdrDataOffset = (char*)(pbi.PebBaseAddress) + offsetof(PEB,Ldr);
    char* addr;
    PEB_LDR_DATA LdrData;

    if( !ReadMem( LdrDataOffset, &addr, sizeof( void* ) ) || !ReadMem( addr, &LdrData, sizeof( LdrData ) ) ) 
        return 0;

    LIST_ENTRY* head = LdrData.InMemoryOrderModuleList.Flink;
    LIST_ENTRY* next = head;

    do {
        LDR_DATA_TABLE_ENTRY LdrEntry;
        LDR_DATA_TABLE_ENTRY* pLdrEntry = CONTAINING_RECORD( head, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks );

        if( !ReadMem( pLdrEntry , &LdrEntry, sizeof(LdrEntry) ) )
            return 0;

        if( LdrEntry.DllBase == (void*)hDll )
        {
            //  
            //  http://www.geoffchappell.com/studies/windows/win32/ntdll/structs/ldr_data_table_entry.htm
            //
            int offDdagNode = (0x14 - BITNESS) * sizeof(void*);   // See offset on LDR_DDAG_NODE *DdagNode;

            ULONG count = 0;
            char* addrDdagNode = ((char*)pLdrEntry) + offDdagNode;

            //
            //  http://www.geoffchappell.com/studies/windows/win32/ntdll/structs/ldr_ddag_node.htm
            //  See offset on ULONG LoadCount;
            //
            if( !ReadMem(addrDdagNode, &addr, sizeof(void*) ) || !ReadMem( addr + 3 * sizeof(void*), &count, sizeof(count) ) )
                return 0;

            return (int)count;
        } //if

        head = LdrEntry.InMemoryOrderLinks.Flink;
    }while( head != next );

    return 0;
} //GetModuleLoadCount

注入 .dll 的用法：

// Someone reserved us, let's force us to shutdown.
while( GetModuleLoadCount( dll ) > 1 )
    FreeLibrary(dll);

FreeLibraryAndExitThread(dll, 0);

（更新 3.12.2016）但是请注意 - 建议从主线程使用此函数。主要问题是当你迭代 dll 时 - dll 也可以被释放，之后“while 循环”无限挂起。

如果副线程正在释放 dll，这种意外的 dll 删除也可能从主线程发生，但这种情况很少发生。