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From 95ea90bc29b45f9b07b55c6cbb396fe854199079 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Fri, 31 Jul 2015 15:59:43 +0200
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Subject: [PATCH 2/7] rtl8139: drop tautologous if (ip) {...} statement
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(CVE-2015-5165)
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Message-id: <1438358388-10575-3-git-send-email-stefanha@redhat.com>
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Patchwork-id: 67238
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O-Subject: [RHEL-7.1.z qemu-kvm EMBARGOED PATCH 2/7] rtl8139: drop tautologous if (ip) {...} statement (CVE-2015-5165)
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Bugzilla: 1248764
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Xiao Wang <jasowang@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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The previous patch stopped using the ip pointer as an indicator that the
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IP header is present. When we reach the if (ip) {...} statement we know
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ip is always non-NULL.
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Remove the if statement to reduce nesting.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/net/rtl8139.c | 305 +++++++++++++++++++++++++++----------------------------
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1 file changed, 151 insertions(+), 154 deletions(-)
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diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
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index e3b594f..ab32714 100644
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--- a/hw/net/rtl8139.c
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+++ b/hw/net/rtl8139.c
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@@ -2176,198 +2176,195 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
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ip_protocol = ip->ip_p;
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ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
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- if (ip)
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+ if (txdw0 & CP_TX_IPCS)
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{
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- if (txdw0 & CP_TX_IPCS)
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- {
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- DPRINTF("+++ C+ mode need IP checksum\n");
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+ DPRINTF("+++ C+ mode need IP checksum\n");
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- if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min header length */
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- /* bad packet header len */
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- /* or packet too short */
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- }
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- else
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- {
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- ip->ip_sum = 0;
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- ip->ip_sum = ip_checksum(ip, hlen);
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- DPRINTF("+++ C+ mode IP header len=%d checksum=%04x\n",
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- hlen, ip->ip_sum);
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- }
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+ if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min header length */
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+ /* bad packet header len */
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+ /* or packet too short */
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}
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-
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- if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
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+ else
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{
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- int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK;
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+ ip->ip_sum = 0;
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+ ip->ip_sum = ip_checksum(ip, hlen);
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+ DPRINTF("+++ C+ mode IP header len=%d checksum=%04x\n",
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+ hlen, ip->ip_sum);
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+ }
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+ }
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- DPRINTF("+++ C+ mode offloaded task TSO MTU=%d IP data %d "
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- "frame data %d specified MSS=%d\n", ETH_MTU,
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- ip_data_len, saved_size - ETH_HLEN, large_send_mss);
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+ if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
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+ {
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+ int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK;
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- int tcp_send_offset = 0;
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- int send_count = 0;
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+ DPRINTF("+++ C+ mode offloaded task TSO MTU=%d IP data %d "
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+ "frame data %d specified MSS=%d\n", ETH_MTU,
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+ ip_data_len, saved_size - ETH_HLEN, large_send_mss);
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- /* maximum IP header length is 60 bytes */
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- uint8_t saved_ip_header[60];
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+ int tcp_send_offset = 0;
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+ int send_count = 0;
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- /* save IP header template; data area is used in tcp checksum calculation */
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- memcpy(saved_ip_header, eth_payload_data, hlen);
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+ /* maximum IP header length is 60 bytes */
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+ uint8_t saved_ip_header[60];
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- /* a placeholder for checksum calculation routine in tcp case */
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- uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
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- // size_t data_to_checksum_len = eth_payload_len - hlen + 12;
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+ /* save IP header template; data area is used in tcp checksum calculation */
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+ memcpy(saved_ip_header, eth_payload_data, hlen);
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- /* pointer to TCP header */
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- tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen);
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+ /* a placeholder for checksum calculation routine in tcp case */
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+ uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
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+ // size_t data_to_checksum_len = eth_payload_len - hlen + 12;
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- int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
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+ /* pointer to TCP header */
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+ tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen);
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- /* ETH_MTU = ip header len + tcp header len + payload */
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- int tcp_data_len = ip_data_len - tcp_hlen;
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- int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
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+ int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
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- DPRINTF("+++ C+ mode TSO IP data len %d TCP hlen %d TCP "
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- "data len %d TCP chunk size %d\n", ip_data_len,
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- tcp_hlen, tcp_data_len, tcp_chunk_size);
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+ /* ETH_MTU = ip header len + tcp header len + payload */
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+ int tcp_data_len = ip_data_len - tcp_hlen;
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+ int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
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- /* note the cycle below overwrites IP header data,
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- but restores it from saved_ip_header before sending packet */
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+ DPRINTF("+++ C+ mode TSO IP data len %d TCP hlen %d TCP "
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+ "data len %d TCP chunk size %d\n", ip_data_len,
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+ tcp_hlen, tcp_data_len, tcp_chunk_size);
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- int is_last_frame = 0;
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+ /* note the cycle below overwrites IP header data,
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+ but restores it from saved_ip_header before sending packet */
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- for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len; tcp_send_offset += tcp_chunk_size)
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- {
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- uint16_t chunk_size = tcp_chunk_size;
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-
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- /* check if this is the last frame */
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- if (tcp_send_offset + tcp_chunk_size >= tcp_data_len)
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- {
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- is_last_frame = 1;
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- chunk_size = tcp_data_len - tcp_send_offset;
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- }
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-
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- DPRINTF("+++ C+ mode TSO TCP seqno %08x\n",
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- be32_to_cpu(p_tcp_hdr->th_seq));
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-
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- /* add 4 TCP pseudoheader fields */
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- /* copy IP source and destination fields */
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- memcpy(data_to_checksum, saved_ip_header + 12, 8);
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-
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- DPRINTF("+++ C+ mode TSO calculating TCP checksum for "
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- "packet with %d bytes data\n", tcp_hlen +
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- chunk_size);
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-
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- if (tcp_send_offset)
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- {
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- memcpy((uint8_t*)p_tcp_hdr + tcp_hlen, (uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size);
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- }
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-
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- /* keep PUSH and FIN flags only for the last frame */
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- if (!is_last_frame)
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- {
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- TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr, TCP_FLAG_PUSH|TCP_FLAG_FIN);
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- }
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-
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- /* recalculate TCP checksum */
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- ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum;
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- p_tcpip_hdr->zeros = 0;
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- p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
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- p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen + chunk_size);
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-
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- p_tcp_hdr->th_sum = 0;
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-
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- int tcp_checksum = ip_checksum(data_to_checksum, tcp_hlen + chunk_size + 12);
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- DPRINTF("+++ C+ mode TSO TCP checksum %04x\n",
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- tcp_checksum);
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-
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- p_tcp_hdr->th_sum = tcp_checksum;
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-
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- /* restore IP header */
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- memcpy(eth_payload_data, saved_ip_header, hlen);
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-
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- /* set IP data length and recalculate IP checksum */
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- ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size);
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-
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- /* increment IP id for subsequent frames */
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- ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size + be16_to_cpu(ip->ip_id));
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-
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- ip->ip_sum = 0;
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- ip->ip_sum = ip_checksum(eth_payload_data, hlen);
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- DPRINTF("+++ C+ mode TSO IP header len=%d "
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- "checksum=%04x\n", hlen, ip->ip_sum);
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-
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- int tso_send_size = ETH_HLEN + hlen + tcp_hlen + chunk_size;
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- DPRINTF("+++ C+ mode TSO transferring packet size "
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- "%d\n", tso_send_size);
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- rtl8139_transfer_frame(s, saved_buffer, tso_send_size,
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- 0, (uint8_t *) dot1q_buffer);
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-
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- /* add transferred count to TCP sequence number */
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- p_tcp_hdr->th_seq = cpu_to_be32(chunk_size + be32_to_cpu(p_tcp_hdr->th_seq));
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- ++send_count;
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- }
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+ int is_last_frame = 0;
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- /* Stop sending this frame */
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- saved_size = 0;
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- }
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- else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS))
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+ for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len; tcp_send_offset += tcp_chunk_size)
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{
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- DPRINTF("+++ C+ mode need TCP or UDP checksum\n");
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+ uint16_t chunk_size = tcp_chunk_size;
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- /* maximum IP header length is 60 bytes */
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- uint8_t saved_ip_header[60];
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- memcpy(saved_ip_header, eth_payload_data, hlen);
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+ /* check if this is the last frame */
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+ if (tcp_send_offset + tcp_chunk_size >= tcp_data_len)
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+ {
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+ is_last_frame = 1;
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+ chunk_size = tcp_data_len - tcp_send_offset;
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+ }
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- uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
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- // size_t data_to_checksum_len = eth_payload_len - hlen + 12;
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+ DPRINTF("+++ C+ mode TSO TCP seqno %08x\n",
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+ be32_to_cpu(p_tcp_hdr->th_seq));
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/* add 4 TCP pseudoheader fields */
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/* copy IP source and destination fields */
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memcpy(data_to_checksum, saved_ip_header + 12, 8);
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- if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP)
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+ DPRINTF("+++ C+ mode TSO calculating TCP checksum for "
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+ "packet with %d bytes data\n", tcp_hlen +
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+ chunk_size);
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+
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+ if (tcp_send_offset)
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{
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- DPRINTF("+++ C+ mode calculating TCP checksum for "
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- "packet with %d bytes data\n", ip_data_len);
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+ memcpy((uint8_t*)p_tcp_hdr + tcp_hlen, (uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size);
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+ }
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- ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum;
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- p_tcpip_hdr->zeros = 0;
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- p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
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- p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
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+ /* keep PUSH and FIN flags only for the last frame */
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+ if (!is_last_frame)
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+ {
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+ TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr, TCP_FLAG_PUSH|TCP_FLAG_FIN);
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+ }
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- tcp_header* p_tcp_hdr = (tcp_header *) (data_to_checksum+12);
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+ /* recalculate TCP checksum */
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+ ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum;
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+ p_tcpip_hdr->zeros = 0;
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+ p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
|
|
|
b2d9fb |
+ p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen + chunk_size);
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- p_tcp_hdr->th_sum = 0;
|
|
|
b2d9fb |
+ p_tcp_hdr->th_sum = 0;
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- int tcp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12);
|
|
|
b2d9fb |
- DPRINTF("+++ C+ mode TCP checksum %04x\n",
|
|
|
b2d9fb |
- tcp_checksum);
|
|
|
b2d9fb |
+ int tcp_checksum = ip_checksum(data_to_checksum, tcp_hlen + chunk_size + 12);
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode TSO TCP checksum %04x\n",
|
|
|
b2d9fb |
+ tcp_checksum);
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- p_tcp_hdr->th_sum = tcp_checksum;
|
|
|
b2d9fb |
- }
|
|
|
b2d9fb |
- else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IP_PROTO_UDP)
|
|
|
b2d9fb |
- {
|
|
|
b2d9fb |
- DPRINTF("+++ C+ mode calculating UDP checksum for "
|
|
|
b2d9fb |
- "packet with %d bytes data\n", ip_data_len);
|
|
|
b2d9fb |
+ p_tcp_hdr->th_sum = tcp_checksum;
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header *)data_to_checksum;
|
|
|
b2d9fb |
- p_udpip_hdr->zeros = 0;
|
|
|
b2d9fb |
- p_udpip_hdr->ip_proto = IP_PROTO_UDP;
|
|
|
b2d9fb |
- p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
|
|
|
b2d9fb |
+ /* restore IP header */
|
|
|
b2d9fb |
+ memcpy(eth_payload_data, saved_ip_header, hlen);
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- udp_header *p_udp_hdr = (udp_header *) (data_to_checksum+12);
|
|
|
b2d9fb |
+ /* set IP data length and recalculate IP checksum */
|
|
|
b2d9fb |
+ ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size);
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- p_udp_hdr->uh_sum = 0;
|
|
|
b2d9fb |
+ /* increment IP id for subsequent frames */
|
|
|
b2d9fb |
+ ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size + be16_to_cpu(ip->ip_id));
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- int udp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12);
|
|
|
b2d9fb |
- DPRINTF("+++ C+ mode UDP checksum %04x\n",
|
|
|
b2d9fb |
- udp_checksum);
|
|
|
b2d9fb |
+ ip->ip_sum = 0;
|
|
|
b2d9fb |
+ ip->ip_sum = ip_checksum(eth_payload_data, hlen);
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode TSO IP header len=%d "
|
|
|
b2d9fb |
+ "checksum=%04x\n", hlen, ip->ip_sum);
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- p_udp_hdr->uh_sum = udp_checksum;
|
|
|
b2d9fb |
- }
|
|
|
b2d9fb |
+ int tso_send_size = ETH_HLEN + hlen + tcp_hlen + chunk_size;
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode TSO transferring packet size "
|
|
|
b2d9fb |
+ "%d\n", tso_send_size);
|
|
|
b2d9fb |
+ rtl8139_transfer_frame(s, saved_buffer, tso_send_size,
|
|
|
b2d9fb |
+ 0, (uint8_t *) dot1q_buffer);
|
|
|
b2d9fb |
|
|
|
b2d9fb |
- /* restore IP header */
|
|
|
b2d9fb |
- memcpy(eth_payload_data, saved_ip_header, hlen);
|
|
|
b2d9fb |
+ /* add transferred count to TCP sequence number */
|
|
|
b2d9fb |
+ p_tcp_hdr->th_seq = cpu_to_be32(chunk_size + be32_to_cpu(p_tcp_hdr->th_seq));
|
|
|
b2d9fb |
+ ++send_count;
|
|
|
b2d9fb |
}
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ /* Stop sending this frame */
|
|
|
b2d9fb |
+ saved_size = 0;
|
|
|
b2d9fb |
+ }
|
|
|
b2d9fb |
+ else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS))
|
|
|
b2d9fb |
+ {
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode need TCP or UDP checksum\n");
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ /* maximum IP header length is 60 bytes */
|
|
|
b2d9fb |
+ uint8_t saved_ip_header[60];
|
|
|
b2d9fb |
+ memcpy(saved_ip_header, eth_payload_data, hlen);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
|
|
|
b2d9fb |
+ // size_t data_to_checksum_len = eth_payload_len - hlen + 12;
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ /* add 4 TCP pseudoheader fields */
|
|
|
b2d9fb |
+ /* copy IP source and destination fields */
|
|
|
b2d9fb |
+ memcpy(data_to_checksum, saved_ip_header + 12, 8);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP)
|
|
|
b2d9fb |
+ {
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode calculating TCP checksum for "
|
|
|
b2d9fb |
+ "packet with %d bytes data\n", ip_data_len);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum;
|
|
|
b2d9fb |
+ p_tcpip_hdr->zeros = 0;
|
|
|
b2d9fb |
+ p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
|
|
|
b2d9fb |
+ p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ tcp_header* p_tcp_hdr = (tcp_header *) (data_to_checksum+12);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ p_tcp_hdr->th_sum = 0;
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ int tcp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12);
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode TCP checksum %04x\n",
|
|
|
b2d9fb |
+ tcp_checksum);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ p_tcp_hdr->th_sum = tcp_checksum;
|
|
|
b2d9fb |
+ }
|
|
|
b2d9fb |
+ else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IP_PROTO_UDP)
|
|
|
b2d9fb |
+ {
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode calculating UDP checksum for "
|
|
|
b2d9fb |
+ "packet with %d bytes data\n", ip_data_len);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header *)data_to_checksum;
|
|
|
b2d9fb |
+ p_udpip_hdr->zeros = 0;
|
|
|
b2d9fb |
+ p_udpip_hdr->ip_proto = IP_PROTO_UDP;
|
|
|
b2d9fb |
+ p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ udp_header *p_udp_hdr = (udp_header *) (data_to_checksum+12);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ p_udp_hdr->uh_sum = 0;
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ int udp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12);
|
|
|
b2d9fb |
+ DPRINTF("+++ C+ mode UDP checksum %04x\n",
|
|
|
b2d9fb |
+ udp_checksum);
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ p_udp_hdr->uh_sum = udp_checksum;
|
|
|
b2d9fb |
+ }
|
|
|
b2d9fb |
+
|
|
|
b2d9fb |
+ /* restore IP header */
|
|
|
b2d9fb |
+ memcpy(eth_payload_data, saved_ip_header, hlen);
|
|
|
b2d9fb |
}
|
|
|
b2d9fb |
}
|
|
|
b2d9fb |
|
|
|
b2d9fb |
--
|
|
|
b2d9fb |
1.8.3.1
|
|
|
b2d9fb |
|