kernelbase: Use PEB ConsoleHandle to check for console connection in AllocConsole.

dlls/kernel32/kernel_main.c

@@ -150,6 +150,7 @@ static BOOL process_attach( HMODULE module )
     if (params->ConsoleHandle == KERNEL32_CONSOLE_ALLOC)
     {
         HMODULE mod = GetModuleHandleA(0);
+        params->ConsoleHandle = NULL;
         if (RtlImageNtHeader(mod)->OptionalHeader.Subsystem == IMAGE_SUBSYSTEM_WINDOWS_CUI)
             AllocConsole();
     }

dlls/kernelbase/console.c

@@ -275,20 +275,18 @@ BOOL WINAPI AllocConsole(void)
     STARTUPINFOW app_si, console_si;
     WCHAR buffer[1024], cmd[256];
     PROCESS_INFORMATION pi;
-    HANDLE event, std_in, console;
-    DWORD mode;
+    HANDLE event, console;
     BOOL ret;
 
     TRACE("()\n");
 
     RtlEnterCriticalSection( &console_section );
 
-    std_in = CreateFileW( L"CONIN$", GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE, 0, NULL, OPEN_EXISTING, 0, 0 );
-    if (GetConsoleMode( std_in, &mode ))
+    if (RtlGetCurrentPeb()->ProcessParameters->ConsoleHandle)
     {
         /* we already have a console opened on this process, don't create a new one */
-        CloseHandle( std_in );
         RtlLeaveCriticalSection( &console_section );
+        SetLastError( ERROR_ACCESS_DENIED );
         return FALSE;
     }