dix: reorganize property code to better support xace hook; requires new API for

changing a property, dixChangeWindowProperty, taking an additional client argument.

Xext/security.c

@@ -1715,7 +1715,7 @@ SecurityCheckPropertyAccess(CallbackListPtr *pcbl, pointer unused,
 
     /* if client trusted or window untrusted, allow operation */
 
-    if ( (TRUSTLEVEL(client) == XSecurityClientTrusted) ||
+    if (!client || (TRUSTLEVEL(client) == XSecurityClientTrusted) ||
 	 (TRUSTLEVEL(wClient(pWin)) != XSecurityClientTrusted) )
 	return;
 

Xext/xselinux.c

@@ -1070,7 +1070,7 @@ XSELinuxProperty(CallbackListPtr *pcbl, pointer unused, pointer calldata)
     char *propname = NameForAtom(rec->propertyName);
 
     tclient = wClient(pWin);
-    if (!tclient || !HAVESTATE(tclient))
+    if (!client || !tclient || !HAVESTATE(tclient))
         return;
 
     propsid = GetPropertySID(SID(tclient)->ctx, propname);

dix/property.c

@@ -230,19 +230,9 @@ ProcChangeProperty(ClientPtr client)
 	return(BadAtom);
     }
 
-    switch (XaceHook(XACE_PROPERTY_ACCESS, client, pWin,
+    err = dixChangeWindowProperty(client, pWin, stuff->property, stuff->type,
-		     FindProperty(pWin, stuff->property), stuff->property,
+				  (int)format, (int)mode, len, &stuff[1],
-		     DixWriteAccess))
+				  TRUE);
-    {
-    case XaceErrorOperation:
-	client->errorValue = stuff->property;
-	return BadAtom;
-    case XaceIgnoreOperation:
-	return Success;
-    }
-
-    err = ChangeWindowProperty(pWin, stuff->property, stuff->type, (int)format,
-			       (int)mode, len, (pointer)&stuff[1], TRUE);
     if (err != Success)
 	return err;
     else
@@ -250,9 +240,9 @@ ProcChangeProperty(ClientPtr client)
 }
 
 _X_EXPORT int
-ChangeWindowProperty(WindowPtr pWin, Atom property, Atom type, int format, 
+dixChangeWindowProperty(ClientPtr pClient, WindowPtr pWin, Atom property,
-                     int mode, unsigned long len, pointer value, 
+			Atom type, int format, int mode, unsigned long len,
-                     Bool sendevent)
+			pointer value, Bool sendevent)
 {
     PropertyPtr pProp;
     xEvent event;
@@ -286,12 +276,34 @@ ChangeWindowProperty(WindowPtr pWin, Atom property, Atom type, int format,
 	if (len)
 	    memmove((char *)data, (char *)value, totalSize);
 	pProp->size = len;
-        pProp->next = pWin->optional->userProps;
 	pProp->devPrivates = NULL;
+	switch (XaceHook(XACE_PROPERTY_ACCESS, pClient, pWin, pProp, property,
+			 DixWriteAccess))
+	{
+	case XaceErrorOperation:
+	    xfree(data);
+	    xfree(pProp);
+	    pClient->errorValue = property;
+	    return BadAtom;
+	case XaceIgnoreOperation:
+	    xfree(data);
+	    xfree(pProp);
+	    return Success;
+	}
+        pProp->next = pWin->optional->userProps;
         pWin->optional->userProps = pProp;
     }
     else
     {
+	switch (XaceHook(XACE_PROPERTY_ACCESS, pClient, pWin, pProp, property,
+			 DixWriteAccess))
+	{
+	case XaceErrorOperation:
+	    pClient->errorValue = property;
+	    return BadAtom;
+	case XaceIgnoreOperation:
+	    return Success;
+	}
 	/* To append or prepend to a property the request format and type
 		must match those of the already defined property.  The
 		existing format and type are irrelevant when using the mode
@@ -357,6 +369,15 @@ ChangeWindowProperty(WindowPtr pWin, Atom property, Atom type, int format,
     return(Success);
 }
 
+_X_EXPORT int
+ChangeWindowProperty(WindowPtr pWin, Atom property, Atom type, int format, 
+		     int mode, unsigned long len, pointer value, 
+		     Bool sendevent)
+{
+    return dixChangeWindowProperty(NullClient, pWin, property, type, format,
+				   mode, len, value, sendevent);
+}
+
 int
 DeleteProperty(WindowPtr pWin, Atom propName)
 {

hw/xfree86/loader/dixsym.c

@@ -192,6 +192,7 @@ _X_HIDDEN void *dixLookupTab[] = {
 #endif
     /* property.c */
     SYMFUNC(ChangeWindowProperty)
+    SYMFUNC(dixChangeWindowProperty)
     /* extension.c */
     SYMFUNC(AddExtension)
     SYMFUNC(AddExtensionAlias)

include/property.h

@@ -52,6 +52,17 @@ SOFTWARE.
 
 typedef struct _Property *PropertyPtr;
 
+extern int dixChangeWindowProperty(
+    ClientPtr /*pClient*/,
+    WindowPtr /*pWin*/,
+    Atom /*property*/,
+    Atom /*type*/,
+    int /*format*/,
+    int /*mode*/,
+    unsigned long /*len*/,
+    pointer /*value*/,
+    Bool /*sendevent*/);
+
 extern int ChangeWindowProperty(
     WindowPtr /*pWin*/,
     Atom /*property*/,