From 963e69b8efc39369915e7f0c6f370ac0d5d2b60f Mon Sep 17 00:00:00 2001
From: Eamon Walsh <ewalsh@tycho.nsa.gov>
Date: Wed, 19 Sep 2007 11:11:41 -0400
Subject: [PATCH] xace: add special-case for just setting the event mask on a
 window, this should only check "receive" permission, not "setattr"
 permission.

---
 dix/dispatch.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/dix/dispatch.c b/dix/dispatch.c
index 507854ee6..8c68e5567 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -570,11 +570,13 @@ ProcChangeWindowAttributes(ClientPtr client)
 {
     WindowPtr pWin;
     REQUEST(xChangeWindowAttributesReq);
-    int result;
-    int len, rc;
+    int result, len, rc;
+    Mask access_mode = DixSetAttrAccess;
 
     REQUEST_AT_LEAST_SIZE(xChangeWindowAttributesReq);
-    rc = dixLookupWindow(&pWin, stuff->window, client, DixSetAttrAccess);
+    if (stuff->valueMask == CWEventMask)
+	access_mode = DixReceiveAccess;
+    rc = dixLookupWindow(&pWin, stuff->window, client, access_mode);
     if (rc != Success)
         return rc;
     len = client->req_len - (sizeof(xChangeWindowAttributesReq) >> 2);