From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id 20671A05D3 for ; Thu, 25 Apr 2019 19:16:10 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 22D411B5C1; Thu, 25 Apr 2019 19:16:09 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 72DD91B5AA; Thu, 25 Apr 2019 19:16:07 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Apr 2019 10:16:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,394,1549958400"; d="scan'208";a="137441661" Received: from silpixa00399499.ir.intel.com (HELO silpixa00399499.ger.corp.intel.com) ([10.237.222.133]) by orsmga008.jf.intel.com with ESMTP; 25 Apr 2019 10:16:04 -0700 From: Herakliusz Lipiec To: Keith Wiles Cc: dev@dpdk.org, Herakliusz Lipiec , rasland@mellanox.com, stable@dpdk.org Date: Thu, 25 Apr 2019 18:17:01 +0100 Message-Id: <20190425171702.933-1-herakliusz.lipiec@intel.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190425164700.30948-1-herakliusz.lipiec@intel.com> References: <20190425164700.30948-1-herakliusz.lipiec@intel.com> Subject: [dpdk-dev] [PATCH v2] net/tap: fix potential buffer overrun X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Content-Type: text/plain; charset="UTF-8" Message-ID: <20190425171701.Pjx1Qc-DUhylHU8OvZWXGRHjej9OBdwNGboDlCs9pL4@z> When secondary to primary process synchronization occours there is no check for number of fds which could cause buffer overrun. Bugzilla ID: 252 Fixes: c9aa56edec8e ("net/tap: access primary process queues from secondary") Cc: rasland@mellanox.com Cc: stable@dpdk.org Signed-off-by: Herakliusz Lipiec --- drivers/net/tap/rte_eth_tap.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index e9fda8cf6..4a2ef5ce7 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -2111,6 +2111,10 @@ tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev) TAP_LOG(DEBUG, "Received IPC reply for %s", reply_param->port_name); /* Attach the queues from received file descriptors */ + if (reply_param->rxq_count + reply_param->txq_count != reply->num_fds) { + TAP_LOG(ERR, "Unexpected number of fds received"); + return -1; + } dev->data->nb_rx_queues = reply_param->rxq_count; dev->data->nb_tx_queues = reply_param->txq_count; fd_iterator = 0; @@ -2151,12 +2155,16 @@ tap_mp_sync_queues(const struct rte_mp_msg *request, const void *peer) /* Fill file descriptors for all queues */ reply.num_fds = 0; reply_param->rxq_count = 0; + if (dev->data->nb_rx_queues + dev->data->nb_tx_queues > + RTE_MP_MAX_FD_NUM){ + TAP_LOG(ERR, "Number of rx/tx queues exceeds max number of fds"); + return -1; + } for (queue = 0; queue < dev->data->nb_rx_queues; queue++) { reply.fds[reply.num_fds++] = process_private->rxq_fds[queue]; reply_param->rxq_count++; } RTE_ASSERT(reply_param->rxq_count == dev->data->nb_rx_queues); - RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues); RTE_ASSERT(reply.num_fds <= RTE_MP_MAX_FD_NUM); reply_param->txq_count = 0; @@ -2164,7 +2172,8 @@ tap_mp_sync_queues(const struct rte_mp_msg *request, const void *peer) reply.fds[reply.num_fds++] = process_private->txq_fds[queue]; reply_param->txq_count++; } - + RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues); + RTE_ASSERT(reply.num_fds <= RTE_MP_MAX_FD_NUM); /* Send reply */ strlcpy(reply.name, request->name, sizeof(reply.name)); strlcpy(reply_param->port_name, request_param->port_name, -- 2.17.2