From patchwork Wed Sep 15 21:43:04 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Rosenberg X-Patchwork-Id: 64911 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 5FB1BB6EEC for ; Thu, 16 Sep 2010 07:50:07 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754228Ab0IOVt2 (ORCPT ); Wed, 15 Sep 2010 17:49:28 -0400 Received: from mx1.vsecurity.com ([209.67.252.12]:63304 "EHLO mx1.vsecurity.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752009Ab0IOVt1 (ORCPT ); Wed, 15 Sep 2010 17:49:27 -0400 Received: (qmail 53627 invoked from network); 15 Sep 2010 21:42:24 -0000 Received: from unknown (HELO [138.16.110.183]) (drosenbe@[138.16.110.183]) (envelope-sender ) by mx1.vsecurity.com (qmail-ldap-1.03) with SMTP for ; 15 Sep 2010 21:42:24 -0000 Subject: [PATCH v2] drivers/net/eql.c: prevent reading uninitialized stack memory From: Dan Rosenberg To: linux-kernel@vger.kernel.org Cc: netdev@vger.kernel.org, security@kernel.org, stable@kernel.org Date: Wed, 15 Sep 2010 17:43:04 -0400 Message-ID: <1284586984.6275.92.camel@dan> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Fixed formatting (tabs and line breaks). The EQL_GETMASTRCFG device ioctl allows unprivileged users to read 16 bytes of uninitialized stack memory, because the "master_name" member of the master_config_t struct declared on the stack in eql_g_master_cfg() is not altered or zeroed before being copied back to the user. This patch takes care of it. Signed-off-by: Dan Rosenberg --- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- linux-2.6.35.4.orig/drivers/net/eql.c 2010-08-26 19:47:12.000000000 -0400 +++ linux-2.6.35.4/drivers/net/eql.c 2010-09-14 21:25:27.719474445 -0400 @@ -555,6 +555,8 @@ static int eql_g_master_cfg(struct net_d equalizer_t *eql; master_config_t mc; + memset(&mc, 0, sizeof(master_config_t)); + if (eql_is_master(dev)) { eql = netdev_priv(dev); mc.max_slaves = eql->max_slaves;