155 lines
3.3 KiB
C++
155 lines
3.3 KiB
C++
/*++
|
|
|
|
Copyright (c) 2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
WinExecRaceConditionFix.cpp
|
|
|
|
Abstract:
|
|
|
|
This Shim uses the command line parameter to indicate how it works:
|
|
|
|
If passed 'nowait', it enables the WinExec functionality:
|
|
The WinExec in this DLL is identical to the actual WinExec API but without
|
|
the WaitForUserinputIdleRoutine, which inverts an almost race condition
|
|
between the launcher and the launchee. 9x does not have this wait, so the
|
|
programmers were able to (possibly inadvertently) use the same window class
|
|
exclusion matching for both since, in 9x, the launcher kills itself before
|
|
the launchee can check for a duplicate window. This shim leaves out the
|
|
wait condition, allowing 9x like behavior.
|
|
|
|
If passed a number, it sleeps in initialization for that number of
|
|
microseconds.
|
|
|
|
Notes:
|
|
|
|
This shim has no app specific information.
|
|
|
|
History:
|
|
|
|
03/22/2000 a-charr Created
|
|
|
|
--*/
|
|
|
|
#include "precomp.h"
|
|
|
|
IMPLEMENT_SHIM_BEGIN(WinExecRaceConditionFix)
|
|
#include "ShimHookMacro.h"
|
|
|
|
APIHOOK_ENUM_BEGIN
|
|
APIHOOK_ENUM_ENTRY(WinExec)
|
|
APIHOOK_ENUM_END
|
|
|
|
/*++
|
|
|
|
This function breaks into WinExec and calls CreateProcessA without
|
|
waiting afterward.
|
|
|
|
--*/
|
|
|
|
UINT
|
|
APIHOOK(WinExec)(
|
|
LPCSTR lpCmdLine,
|
|
UINT uCmdShow
|
|
)
|
|
/*++
|
|
|
|
This is a direct copy of the actual WinExec API minus two sections,
|
|
|
|
1. UserWaitForInputIdleRoutine is removed because it is waiting for the spawned
|
|
process to begin its event loop, but the spawned process is killing itself
|
|
before starting the event loop because the spawning process is waiting for
|
|
it.
|
|
|
|
2. Some app specific appcompat code that seems to be hanging around from who
|
|
knows when.
|
|
|
|
--*/
|
|
{
|
|
STARTUPINFOA StartupInfo;
|
|
PROCESS_INFORMATION ProcessInformation;
|
|
BOOL CreateProcessStatus;
|
|
DWORD ErrorCode;
|
|
|
|
LOGN(
|
|
eDbgLevelInfo,
|
|
"[WinExec] Called. Returning without waiting for new process to start.");
|
|
|
|
RtlZeroMemory(&StartupInfo,sizeof(StartupInfo));
|
|
|
|
StartupInfo.cb = sizeof(StartupInfo);
|
|
StartupInfo.dwFlags = STARTF_USESHOWWINDOW;
|
|
StartupInfo.wShowWindow = (WORD)uCmdShow;
|
|
|
|
CreateProcessStatus = CreateProcessA(
|
|
NULL,
|
|
(LPSTR)lpCmdLine,
|
|
NULL,
|
|
NULL,
|
|
FALSE,
|
|
0,
|
|
NULL,
|
|
NULL,
|
|
&StartupInfo,
|
|
&ProcessInformation);
|
|
|
|
if (CreateProcessStatus) {
|
|
return 33;
|
|
} else {
|
|
ErrorCode = GetLastError();
|
|
|
|
switch (ErrorCode) {
|
|
case ERROR_FILE_NOT_FOUND:
|
|
return 2;
|
|
|
|
case ERROR_PATH_NOT_FOUND:
|
|
return 3;
|
|
|
|
case ERROR_BAD_EXE_FORMAT:
|
|
return 11;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
BOOL
|
|
NOTIFY_FUNCTION(
|
|
DWORD fdwReason
|
|
)
|
|
{
|
|
if (fdwReason == DLL_PROCESS_ATTACH) {
|
|
//
|
|
// Sleep when starting up, if the command line is a number.
|
|
//
|
|
long lSleepTicks = atol(COMMAND_LINE);
|
|
|
|
if (lSleepTicks > 0) {
|
|
Sleep((DWORD)lSleepTicks);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/*++
|
|
|
|
Register hooked functions
|
|
|
|
--*/
|
|
|
|
HOOK_BEGIN
|
|
|
|
APIHOOK_ENTRY(KERNEL32.DLL, WinExec)
|
|
|
|
CALL_NOTIFY_FUNCTION
|
|
|
|
HOOK_END
|
|
|
|
|
|
IMPLEMENT_SHIM_END
|
|
|