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163 lines
3.7 KiB
163 lines
3.7 KiB
/*++
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eDbgLevelError
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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UnInstallShield.cpp
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Abstract:
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UnInstallShield has an insidious bug where it calls WaitForSingleObject
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on the HINSTANCE returned by ShellExecute. Since an HINSTANCE is not
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an actual HANDLE, the WaitForSingleObject behaviour was completely random
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and in some cases caused UnInstallShield to hang. The fix is to change
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the HINSTANCE returned from ShellExecute to 0x0BADF00D and then look for
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it being passed in to WaitForSingleObject. If found, WAIT_OBJECT_0 is
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returned immediately to prevent deadlock.
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Notes:
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This is an app specific shim.
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History:
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12/04/2000 jdoherty Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(UnInstallShield)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(ShellExecuteA)
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APIHOOK_ENUM_ENTRY(ShellExecuteW)
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APIHOOK_ENUM_ENTRY(WaitForSingleObject)
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APIHOOK_ENUM_END
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/*++
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Hook ShellExecuteA so we can check the return value.
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--*/
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HINSTANCE
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APIHOOK(ShellExecuteA)(
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HWND hwnd,
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LPSTR lpVerb,
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LPSTR lpFile,
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LPSTR lpParameters,
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LPSTR lpDirectory,
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INT nShowCmd
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)
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{
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HINSTANCE hRet = ORIGINAL_API(ShellExecuteA)(
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hwnd,
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lpVerb,
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lpFile,
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lpParameters,
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lpDirectory,
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nShowCmd
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);
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DPFN( eDbgLevelInfo, "[ShellExecuteA] Checking return value for 0x0000002a");
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if (hRet == (HINSTANCE)0x0000002a)
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{
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DPFN( eDbgLevelInfo, "[ShellExecuteA] 0x0000002a found to be return value. Return 0x0BADF00D");
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//
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// if the HINSTANCE returned is 0x0000002a then return BAADF00D
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//
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hRet = (HINSTANCE)0x0BADF00D;
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}
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return hRet;
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}
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/*++
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Hook ShellExecuteW so we can check the return value.
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--*/
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HINSTANCE
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APIHOOK(ShellExecuteW)(
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HWND hwnd,
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LPWSTR lpVerb,
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LPWSTR lpFile,
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LPWSTR lpParameters,
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LPWSTR lpDirectory,
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INT nShowCmd
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)
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{
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HINSTANCE hRet = ORIGINAL_API(ShellExecuteW)(
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hwnd,
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lpVerb,
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lpFile,
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lpParameters,
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lpDirectory,
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nShowCmd
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);
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DPFN( eDbgLevelInfo, "[ShellExecuteW] Checking return value for 0x0000002a");
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if (hRet == (HINSTANCE)0x0000002a)
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{
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DPFN( eDbgLevelInfo, "[ShellExecuteW] 0x0000002a found to be return value. Return 0x0BADF00D");
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//
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// if the HINSTANCE returned is 0x0000002a then return BAADF00D
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//
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hRet = (HINSTANCE)0x0BADF00D;
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}
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return hRet;
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}
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/*++
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Hook WaitForSingleObject to see if we are waiting for the known HINSTANCE.
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--*/
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DWORD
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APIHOOK(WaitForSingleObject)(
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HANDLE hHandle,
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DWORD dwMilliseconds
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)
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{
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DWORD dRet;
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DPFN( eDbgLevelInfo, "[WaitForSingleObject] Checking to see if hHandle waiting on is 0x0000002A");
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if (hHandle == (HANDLE)0x0BADF00D)
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{
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DPFN( eDbgLevelInfo, "[WaitForSingleObject] hHandle waiting on is 0x0000002A, returning WAIT_OBJECT_0");
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//
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// if the hHandle is 0x0BADF00D then return WAIT_OBJECT_0
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//
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dRet = WAIT_OBJECT_0;
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}
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else
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{
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dRet = ORIGINAL_API(WaitForSingleObject)(
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hHandle,
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dwMilliseconds
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);
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}
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return dRet;
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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(SHELL32.DLL, ShellExecuteA)
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APIHOOK_ENTRY(SHELL32.DLL, ShellExecuteW)
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APIHOOK_ENTRY(KERNEL32.DLL, WaitForSingleObject)
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HOOK_END
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IMPLEMENT_SHIM_END
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