153 lines
3.5 KiB
C++
153 lines
3.5 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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SpecOps2.cpp
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Abstract:
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App does too much within a DLLMain and hangs because dinput is waiting on
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a thread it just created.
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The fix is to prevent the DllMain from running during the loader lock. The
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only way to do this seems to be to hook an API that's called really early
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during the DllMain and jump back to the loader.
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The catch is that we still need to call the DllMain after the LoadLibrary
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has completed.
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Notes:
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This is an app specific shim.
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History:
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05/01/2001 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(SpecOps2)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(GetVersion)
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APIHOOK_ENUM_ENTRY(LoadLibraryA)
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APIHOOK_ENUM_END
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// Global state used to determine what to do for a particular call
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BOOL g_bState = FALSE;
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// The thread handle for matching synchronization logic
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HANDLE g_hThread = NULL;
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/*++
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This is the first API that the DllMain calls, so we're going to back out
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jump straight out of it, back into loader code as if it completed normally.
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--*/
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__declspec(naked)
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DWORD
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APIHOOK(GetVersion)(
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void
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)
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{
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__asm {
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//
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// Make sure we're on the right thread so we don't have to synchronize
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//
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call dword ptr [GetCurrentThread]
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cmp eax, g_hThread
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jne Exit
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// test for the right dll
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cmp g_bState, 1
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jne Exit
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// we're done
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mov g_bState, 0
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// leave the stack and registers as they were before
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add esp, 20
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pop edi
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pop esi
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pop ebx
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pop ebp
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ret 12
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Exit:
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// original api
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call dword ptr [GetVersion]
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ret
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}
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}
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/*++
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When "SO Menu.dll" is loaded, we start the sequence which prevents the DllMain
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from crashing, but it means we have to run the entry point after the load.
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--*/
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HINSTANCE
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APIHOOK(LoadLibraryA)(
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LPCSTR lpLibFileName
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)
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{
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BOOL bCheck = FALSE;
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if (_stricmp(lpLibFileName, "menu\\SO Menu.dll") == 0) {
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//
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// We assume *only* the main thread tries to load this library, so
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// we don't synchronize multiple threads trying to load this same dll
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//
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g_hThread = GetCurrentThread();
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bCheck = TRUE;
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g_bState = TRUE;
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}
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//
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// Load the library, if it's "SO Menu", we'll catch the GetVersion called
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// by its DllMain
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//
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HMODULE hMod = ORIGINAL_API(LoadLibraryA)(lpLibFileName);
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if (hMod && bCheck) {
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//
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// Run the DllMain
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//
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typedef BOOL (WINAPI *_pfn_DllMain)(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
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PIMAGE_DOS_HEADER pIDH = (PIMAGE_DOS_HEADER) hMod;
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PIMAGE_NT_HEADERS pINTH = (PIMAGE_NT_HEADERS)((LPBYTE)hMod + pIDH->e_lfanew);
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_pfn_DllMain pfnMain = (_pfn_DllMain)((LPBYTE)hMod + pINTH->OptionalHeader.AddressOfEntryPoint);
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// Call the startup routine
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(*pfnMain)(hMod, DLL_PROCESS_ATTACH, NULL);
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}
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return hMod;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(KERNEL32.DLL, GetVersion)
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APIHOOK_ENTRY(KERNEL32.DLL, LoadLibraryA)
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HOOK_END
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IMPLEMENT_SHIM_END
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