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[WIN32K:NTUSER] For processes that start without any window station and no desktops but manage these (e.g. winlogon.exe), assign their startup desktop when they assign a desktop to one of their threads.

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Hermès Bélusca-Maïto 2018-07-23 00:15:23 +02:00
parent 3270979327
commit e3b9152935
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33
win32ss/user/ntuser/desktop.c
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@ -3210,6 +3210,39 @@ IntSetThreadDesktop(IN HDESK hDesktop,
}
}
/*
* Processes, in particular Winlogon.exe, that manage window stations
* (especially the interactive WinSta0 window station) and desktops,
* may not be able to connect at startup to a window station and have
* an associated desktop as well, if none exists on the system already.
* Because creating a new window station does not affect the window station
* associated to the process, and because neither by associating a window
* station to the process nor creating a new desktop on it does associate
* a startup desktop to that process, the process has to actually assigns
* one of its threads to a desktop so that it gets automatically an assigned
* startup desktop.
*
* This is what actually happens for Winlogon.exe, which is started without
* any window station and desktop. By creating the first (and therefore
* interactive) WinSta0 window station, then assigning WinSta0 to itself
* and creating the Default desktop on it, and then assigning this desktop
* to its main thread, Winlogon.exe basically does the similar steps that
* would have been done automatically at its startup if there were already
* an existing WinSta0 window station and Default desktop.
*
* Of course all this must not be done if we are a SYSTEM or CSRSS thread.
*/
// if (pti->ppi->peProcess != gpepCSRSS)
if (!(pti->TIF_flags & (TIF_SYSTEMTHREAD | TIF_CSRSSTHREAD)) &&
pti->ppi->rpdeskStartup == NULL && hDesktop != NULL)
{
ERR("The process 0x%p '%s' didn't have an assigned startup desktop before, assigning it now!\n",
pti->ppi->peProcess, pti->ppi->peProcess->ImageFileName);
pti->ppi->hdeskStartup = hDesktop;
pti->ppi->rpdeskStartup = pdesk;
}
/* free all classes or move them to the shared heap */
if (pti->rpdesk != NULL)
{