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 94820A00E6 for ; Wed, 17 Apr 2019 16:25:27 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id B5CED1B6CC; Wed, 17 Apr 2019 16:25:26 +0200 (CEST) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id E44BC1B5F3; Wed, 17 Apr 2019 16:25:24 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Apr 2019 07:25:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,362,1549958400"; d="scan'208";a="162418053" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by fmsmga002.fm.intel.com with ESMTP; 17 Apr 2019 07:25:22 -0700 To: Radu Nicolau , dev@dpdk.org Cc: declan.doherty@intel.com, chas3@att.com, stable@dpdk.org References: <1555320458-9432-1-git-send-email-radu.nicolau@intel.com> <1555493621-353-1-git-send-email-radu.nicolau@intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <1555493621-353-1-git-send-email-radu.nicolau@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2] net/bonding: fix potential out of bounds read 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: <20190417142522.SGUs--ecQ3XinjKG2UcpGRRXip69rkUAi_zTZ42ON3s@z> On 4/17/2019 10:33 AM, Radu Nicolau wrote: > Add validation to pointer constructed from the IPv4 header length > in order to prevent malformed packets from generating a potential > out of bounds memory read. > > Fixes: 09150784a776 ("net/bonding: burst mode hash calculation") > Cc: stable@dpdk.org > > Signed-off-by: Radu Nicolau > --- > v2: add fixes lines > > drivers/net/bonding/rte_eth_bond_pmd.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c > index b0d191d..25dbddc 100644 > --- a/drivers/net/bonding/rte_eth_bond_pmd.c > +++ b/drivers/net/bonding/rte_eth_bond_pmd.c > @@ -842,6 +842,7 @@ burst_xmit_l34_hash(struct rte_mbuf **buf, uint16_t nb_pkts, > > for (i = 0; i < nb_pkts; i++) { > eth_hdr = rte_pktmbuf_mtod(buf[i], struct ether_hdr *); > + size_t pkt_end = (size_t)eth_hdr + rte_pktmbuf_pkt_len(buf[i]); I guess this should be 'data_len' instead. > proto = eth_hdr->ether_type; > vlan_offset = get_vlan_offset(eth_hdr, &proto); > l3hash = 0; > @@ -865,13 +866,17 @@ burst_xmit_l34_hash(struct rte_mbuf **buf, uint16_t nb_pkts, > tcp_hdr = (struct tcp_hdr *) > ((char *)ipv4_hdr + > ip_hdr_offset); > - l4hash = HASH_L4_PORTS(tcp_hdr); > + if ((size_t)tcp_hdr + sizeof(*tcp_hdr) > + < pkt_end) > + l4hash = HASH_L4_PORTS(tcp_hdr); > } else if (ipv4_hdr->next_proto_id == > IPPROTO_UDP) { > udp_hdr = (struct udp_hdr *) > ((char *)ipv4_hdr + > ip_hdr_offset); > - l4hash = HASH_L4_PORTS(udp_hdr); > + if ((size_t)udp_hdr + sizeof(*udp_hdr) > + < pkt_end) > + l4hash = HASH_L4_PORTS(udp_hdr); > } > } > } else if (rte_cpu_to_be_16(ETHER_TYPE_IPv6) == proto) { > Other thing is on action to take when malformed packet is detected, right now it just prevents the out of bound memory access, but calculated hash will be wrong. What do you think skipping/dropping the packet in that case, if possible?