376 lines
9.7 KiB
C++
376 lines
9.7 KiB
C++
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/*
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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SMSDeadlock.cpp
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Abstract:
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SMS experiences a deadlock due to its loading a module that tries to take
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MFC42's AfxResourceLock during DllMain when the LoaderLock is held.
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MFC42's established locking-order is FIRST take the AfxResourceLock, and
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SECONDLY take the loader lock.
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This shim tries to right the order of lock-taking by taking the
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AfxResourceLock prior to allowing LoadLibrary and FreeLibrary calls.
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Thus the order of lock acquisition is righted.
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DLL's for which LoadLibrary takes the Afx lock are specified on the
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command line and separated by semi-colons. A blank command line indicates
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that ALL modules should take the lock.
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NOTE: Every module in a process (including system) should be shimmed by
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this shim. The dlls specified in the command line are the TARGETS of
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LoadLibrary for which we should take the AfxResource lock. To actually
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make that switch no matter who calls LoadLibrary, we must shim all
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modules.
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History:
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09/26/2002 astritz Created
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*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(SMSDeadlock)
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#include "ShimHookMacro.h"
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typedef void (AFXAPI * _pfn_AfxLockGlobals)(int nLockType);
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typedef void (AFXAPI * _pfn_AfxUnlockGlobals)(int nLockType);
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_pfn_AfxLockGlobals g_pfnAfxLockGlobals = NULL;
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_pfn_AfxUnlockGlobals g_pfnAfxUnlockGlobals = NULL;
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CString * g_csLockLib = NULL;
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int g_csLockLibCount = NULL;
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(LoadLibraryA)
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APIHOOK_ENUM_ENTRY(LoadLibraryExA)
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APIHOOK_ENUM_ENTRY(LoadLibraryW)
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APIHOOK_ENUM_ENTRY(LoadLibraryExW)
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APIHOOK_ENUM_ENTRY(FreeLibrary)
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APIHOOK_ENUM_END
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/*++
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This function parses the COMMAND_LINE for the libraries you wish to ignore.
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--*/
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BOOL
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ParseCommandLine(
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LPCSTR lpszCommandLine
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)
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{
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CSTRING_TRY
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{
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DPF(g_szModuleName, eDbgLevelInfo, "[ParseCommandLine] CommandLine(%s)\n", lpszCommandLine);
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CString csCl(lpszCommandLine);
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CStringParser csParser(csCl, L";");
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g_csLockLibCount = csParser.GetCount();
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g_csLockLib = csParser.ReleaseArgv();
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return TRUE;
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}
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CSTRING_CATCH
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{
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// Do nothing.
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}
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return FALSE;
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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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HINSTANCE hRet;
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BOOL bTakeLock = FALSE;
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if( g_pfnAfxLockGlobals && g_pfnAfxUnlockGlobals ) {
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if( g_csLockLibCount == 0 ) {
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bTakeLock = TRUE;
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} else {
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CSTRING_TRY
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{
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CString csFilePath(lpLibFileName);
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CString csFileName;
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csFilePath.GetLastPathComponent(csFileName);
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for (int i = 0; i < g_csLockLibCount; i++)
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{
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if (g_csLockLib[i].CompareNoCase(csFileName) == 0)
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{
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LOG(g_szModuleName,eDbgLevelError, "[LoadLibraryA] Caught attempt loading %ls, taking AfxResourceLock.", g_csLockLib[i].Get());
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bTakeLock = TRUE;
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break;
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}
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}
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}
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CSTRING_CATCH
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{
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// Do Nothing
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}
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}
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}
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if( bTakeLock ) {
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(*g_pfnAfxLockGlobals)(0);
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}
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hRet = ORIGINAL_API(LoadLibraryA)(lpLibFileName);
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if( bTakeLock ) {
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(*g_pfnAfxUnlockGlobals)(0);
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}
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return hRet;
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}
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HINSTANCE
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APIHOOK(LoadLibraryW)(
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LPCWSTR lpLibFileName
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)
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{
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HINSTANCE hRet;
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BOOL bTakeLock = FALSE;
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if( g_pfnAfxLockGlobals && g_pfnAfxUnlockGlobals ) {
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if( g_csLockLibCount == 0 ) {
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bTakeLock = TRUE;
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} else {
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CSTRING_TRY
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{
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CString csFilePath(lpLibFileName);
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CString csFileName;
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csFilePath.GetLastPathComponent(csFileName);
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for (int i = 0; i < g_csLockLibCount; i++)
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{
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if (g_csLockLib[i].CompareNoCase(csFileName) == 0)
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{
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LOG(g_szModuleName,eDbgLevelError, "[LoadLibraryW] Caught attempt loading %ls, taking AfxResourceLock.", g_csLockLib[i].Get());
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bTakeLock = TRUE;
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break;
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}
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}
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}
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CSTRING_CATCH
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{
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// Do Nothing
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}
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}
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}
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if( bTakeLock ) {
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(*g_pfnAfxLockGlobals)(0);
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}
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hRet = ORIGINAL_API(LoadLibraryW)(lpLibFileName);
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if( bTakeLock ) {
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(*g_pfnAfxUnlockGlobals)(0);
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}
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return hRet;
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}
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HINSTANCE
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APIHOOK(LoadLibraryExA)(
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LPCSTR lpLibFileName,
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HANDLE hFile,
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DWORD dwFlags
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)
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{
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HINSTANCE hRet;
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BOOL bTakeLock = FALSE;
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if( g_pfnAfxLockGlobals && g_pfnAfxUnlockGlobals ) {
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if( g_csLockLibCount == 0 ) {
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bTakeLock = TRUE;
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} else {
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CSTRING_TRY
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{
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CString csFilePath(lpLibFileName);
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CString csFileName;
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csFilePath.GetLastPathComponent(csFileName);
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for (int i = 0; i < g_csLockLibCount; i++)
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{
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if (g_csLockLib[i].CompareNoCase(csFileName) == 0)
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{
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LOG(g_szModuleName,eDbgLevelError, "[LoadLibraryExA] Caught attempt loading %ls, taking AfxResourceLock.", g_csLockLib[i].Get());
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bTakeLock = TRUE;
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break;
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}
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}
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}
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CSTRING_CATCH
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{
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// Do Nothing
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}
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}
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}
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if( bTakeLock ) {
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(*g_pfnAfxLockGlobals)(0);
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}
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hRet = ORIGINAL_API(LoadLibraryExA)(lpLibFileName, hFile, dwFlags);
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if( bTakeLock ) {
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(*g_pfnAfxUnlockGlobals)(0);
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}
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return hRet;
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}
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HINSTANCE
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APIHOOK(LoadLibraryExW)(
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LPCWSTR lpLibFileName,
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HANDLE hFile,
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DWORD dwFlags
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)
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{
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HINSTANCE hRet;
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BOOL bTakeLock = FALSE;
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if( g_pfnAfxLockGlobals && g_pfnAfxUnlockGlobals ) {
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if( g_csLockLibCount == 0 ) {
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bTakeLock = TRUE;
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} else {
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CSTRING_TRY
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{
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CString csFilePath(lpLibFileName);
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CString csFileName;
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csFilePath.GetLastPathComponent(csFileName);
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for (int i = 0; i < g_csLockLibCount; i++)
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{
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if (g_csLockLib[i].CompareNoCase(csFileName) == 0)
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{
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LOG(g_szModuleName,eDbgLevelError, "[LoadLibraryExW] Caught attempt loading %ls, taking AfxResourceLock.", g_csLockLib[i].Get());
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bTakeLock = TRUE;
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break;
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}
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}
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}
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CSTRING_CATCH
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{
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// Do Nothing
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}
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}
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}
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if( bTakeLock ) {
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(*g_pfnAfxLockGlobals)(0);
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}
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hRet = ORIGINAL_API(LoadLibraryExW)(lpLibFileName, hFile, dwFlags);
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if( bTakeLock ) {
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(*g_pfnAfxUnlockGlobals)(0);
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}
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return hRet;
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}
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BOOL
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APIHOOK(FreeLibrary)(
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HMODULE hModule
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)
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{
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BOOL bTakeLock = FALSE;
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BOOL bRet;
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if( g_pfnAfxLockGlobals && g_pfnAfxUnlockGlobals ) {
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if( g_csLockLibCount == 0 ) {
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bTakeLock = TRUE;
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} else {
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WCHAR wszModule[MAX_PATH];
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if( GetModuleFileNameW(hModule, wszModule, MAX_PATH) ) {
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CSTRING_TRY
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{
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CString csFilePath(wszModule);
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CString csFileName;
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csFilePath.GetLastPathComponent(csFileName);
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for (int i = 0; i < g_csLockLibCount; i++)
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{
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if (g_csLockLib[i].CompareNoCase(csFileName) == 0)
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{
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LOG(g_szModuleName,eDbgLevelError, "[FreeLibrary] Caught attempt freeing %ls, taking AfxResourceLock.", g_csLockLib[i].Get());
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bTakeLock = TRUE;
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break;
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}
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}
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}
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CSTRING_CATCH
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{
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// Do Nothing
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}
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}
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}
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}
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if( bTakeLock ) {
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(*g_pfnAfxLockGlobals)(0);
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}
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bRet = ORIGINAL_API(FreeLibrary)(hModule);
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if( bTakeLock ) {
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(*g_pfnAfxUnlockGlobals)(0);
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}
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return bRet;
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}
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/*++
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Register hooked functions
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--*/
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason
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)
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{
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if( fdwReason == DLL_PROCESS_ATTACH )
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{
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ParseCommandLine(COMMAND_LINE);
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}
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else if( fdwReason == SHIM_STATIC_DLLS_INITIALIZED )
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{
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HMODULE hMod = LoadLibraryW(L"MFC42.DLL");
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if( NULL != hMod )
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{
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g_pfnAfxLockGlobals = (_pfn_AfxLockGlobals)GetProcAddress(hMod, (LPCSTR)1196);
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g_pfnAfxUnlockGlobals = (_pfn_AfxUnlockGlobals)GetProcAddress(hMod, (LPCSTR)1569);
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}
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}
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return TRUE;
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}
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HOOK_BEGIN
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CALL_NOTIFY_FUNCTION
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APIHOOK_ENTRY(KERNEL32.DLL, LoadLibraryA)
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APIHOOK_ENTRY(KERNEL32.DLL, LoadLibraryExA)
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APIHOOK_ENTRY(KERNEL32.DLL, LoadLibraryW)
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APIHOOK_ENTRY(KERNEL32.DLL, LoadLibraryExW)
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APIHOOK_ENTRY(KERNEL32.DLL, FreeLibrary)
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HOOK_END
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IMPLEMENT_SHIM_END
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