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 9DA2BA0679 for ; Mon, 29 Apr 2019 15:32:54 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 347457CDA; Mon, 29 Apr 2019 15:32:52 +0200 (CEST) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id 716B36CD8; Mon, 29 Apr 2019 15:32:50 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Apr 2019 06:32:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,409,1549958400"; d="scan'208";a="168951289" Received: from aburakov-mobl1.ger.corp.intel.com (HELO [10.237.220.113]) ([10.237.220.113]) by fmsmga001.fm.intel.com with ESMTP; 29 Apr 2019 06:32:48 -0700 To: Herakliusz Lipiec , Keith Wiles Cc: dev@dpdk.org, rasland@mellanox.com, stable@dpdk.org References: <20190425164700.30948-1-herakliusz.lipiec@intel.com> <20190425171702.933-1-herakliusz.lipiec@intel.com> From: "Burakov, Anatoly" Message-ID: Date: Mon, 29 Apr 2019 14:32:47 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190425171702.933-1-herakliusz.lipiec@intel.com> Content-Type: text/plain; charset="UTF-8"; format="flowed" Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [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" Message-ID: <20190429133247.3K0fO8AfTPbxkkngS5LJKJYnIfwbvLt4AzWdU_lG4DI@z> On 25-Apr-19 6:17 PM, Herakliusz Lipiec wrote: > 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, > Reviewed-by: Anatoly Burakov -- Thanks, Anatoly