[UMPNPMGR] PNP_ReportLogOn must not fail on a LiveCD

Fixes CORE-19050

base/services/umpnpmgr/precomp.h

@@ -105,6 +105,7 @@ extern HKEY hEnumKey;
 extern HKEY hClassKey;
 extern BOOL g_IsUISuppressed;
 extern BOOL g_ShuttingDown;
+extern BOOL g_IsLiveMedium;
 
 BOOL
 GetSuppressNewUIValue(VOID);

base/services/umpnpmgr/rpcserver.c

@@ -791,7 +791,7 @@ PNP_ReportLogOn(
            hBinding, Admin, ProcessId);
 
     /* Fail, if the caller is not an interactive user */
-    if (!IsCallerInteractive(hBinding))
+    if ((g_IsLiveMedium == FALSE) && (IsCallerInteractive(hBinding) == FALSE))
         goto cleanup;
 
     /* Get the users token */

base/services/umpnpmgr/umpnpmgr.c

@@ -45,6 +45,7 @@ HKEY hEnumKey = NULL;
 HKEY hClassKey = NULL;
 BOOL g_IsUISuppressed = FALSE;
 BOOL g_ShuttingDown = FALSE;
+BOOL g_IsLiveMedium = FALSE;
 
 /* FUNCTIONS *****************************************************************/
 
@@ -200,6 +201,18 @@ GetSuppressNewUIValue(VOID)
     return bSuppressNewHWUI;
 }
 
+BOOL
+RunningOnLiveMedium(VOID)
+{
+    WCHAR LogPath[MAX_PATH];
+
+    GetSystemWindowsDirectoryW(LogPath, ARRAYSIZE(LogPath));
+    if (GetDriveTypeW(LogPath) == DRIVE_FIXED)
+        return FALSE;
+
+    return TRUE;
+}
+
 VOID WINAPI
 ServiceMain(DWORD argc, LPTSTR *argv)
 {
@@ -211,6 +224,8 @@ ServiceMain(DWORD argc, LPTSTR *argv)
 
     DPRINT("ServiceMain() called\n");
 
+    g_IsLiveMedium = RunningOnLiveMedium();
+
     ServiceStatusHandle = RegisterServiceCtrlHandlerExW(ServiceName,
                                                         ServiceControlHandler,
                                                         NULL);