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Eric Dumazet 59222807fc tcp: enforce tcp_min_snd_mss in tcp_mtu_probing() 
commit 967c05aee4 upstream.

If mtu probing is enabled tcp_mtu_probing() could very well end up
with a too small MSS.

Use the new sysctl tcp_min_snd_mss to make sure MSS search
is performed in an acceptable range.

CVE-2019-11479 -- tcp mss hardcoded to 48

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Cc: Jonathan Looney <jtl@netflix.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Bruce Curtis <brucec@netflix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-17 19:51:56 +02:00
..
bpfilter
bpfilter: remove trailing newline
2018-07-24 14:10:42 -07:00
netfilter
netfilter: ipt_CLUSTERIP: fix warning unused variable cn
2019-03-23 20:09:57 +01:00
af_inet.c
gso_segment: Reset skb->mac_len after modifying network header
2018-09-13 12:09:32 -07:00
ah4.c
…
arp.c
proc: introduce proc_create_net{,_data}
2018-05-16 07:24:30 +02:00
cipso_ipv4.c
net: avoid use IPCB in cipso_v4_error
2019-03-10 07:17:19 +01:00
datagram.c
…
devinet.c
route: add support for directed broadcast forwarding
2018-07-29 12:37:06 -07:00
esp4_offload.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
2018-07-27 09:33:37 -07:00
esp4.c
esp4: add length check for UDP encapsulation
2019-05-25 18:23:41 +02:00
fib_frontend.c
ipv4: Return error for RTA_VIA attribute
2019-03-10 07:17:19 +01:00
fib_lookup.h
…
fib_notifier.c
…
fib_rules.c
net: fib_rules: add extack support
2018-04-23 10:21:24 -04:00
fib_semantics.c
net: ipv4: update fnhe_pmtu when first hop's MTU changes
2018-10-10 22:44:46 -07:00
fib_trie.c
net: ipv4: Fix memory leak in network namespace dismantle
2019-01-31 08:14:32 +01:00
fou.c
net: fou: do not use guehdr after iptunnel_pull_offloads in gue_udp_recv
2019-04-27 09:36:31 +02:00
gre_demux.c
net: ip_gre: use erspan key field for tunnel lookup
2019-02-06 17:30:06 +01:00
gre_offload.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-07-03 10:29:26 +09:00
icmp.c
net: Add __icmp_send helper.
2019-03-10 07:17:19 +01:00
igmp.c
ipv4/igmp: fix build error if !CONFIG_IP_MULTICAST
2019-06-04 08:02:31 +02:00
inet_connection_sock.c
inet: make sure to grab rcu_read_lock before using ireq->ireq_opt
2018-10-02 15:52:12 -07:00
inet_diag.c
inet_diag: fix reporting cgroup classid and fallback to priority
2019-02-27 10:08:58 +01:00
inet_fragment.c
net: IP defrag: encapsulate rbtree defrag code into callable functions
2019-04-27 09:36:33 +02:00
inet_hashtables.c
bpf: Enable BPF_PROG_TYPE_SK_REUSEPORT bpf prog in reuseport selection
2018-08-11 01:58:46 +02:00
inet_timewait_sock.c
soreuseport: initialise timewait reuseport field
2018-04-07 22:32:32 -04:00
inetpeer.c
net: ipv4: use a dedicated counter for icmp_v4 redirect packets
2019-02-23 09:07:24 +01:00
ip_forward.c
net: clear skb->tstamp in forwarding paths
2019-01-09 17:38:31 +01:00
ip_fragment.c
net: IP defrag: encapsulate rbtree defrag code into callable functions
2019-04-27 09:36:33 +02:00
ip_gre.c
net: ip_gre: fix possible use-after-free in erspan_rcv
2019-04-17 08:38:43 +02:00
ip_input.c
vrf: check accept_source_route on the original netdevice
2019-04-17 08:38:42 +02:00
ip_options.c
vrf: check accept_source_route on the original netdevice
2019-04-17 08:38:42 +02:00
ip_output.c
ipv4: ip_do_fragment: Preserve skb_iif during fragmentation
2019-05-05 14:42:36 +02:00
ip_sockglue.c
ip: on queued skb use skb_header_pointer instead of pskb_may_pull
2019-01-22 21:40:31 +01:00
ip_tunnel_core.c
ip_tunnel: don't force DF when MTU is locked
2018-11-23 08:17:02 +01:00
ip_tunnel.c
ip: validate header length on virtual device xmit
2019-01-09 17:38:31 +01:00
ip_vti.c
vti4: ipip tunnel deregistration fixes.
2019-05-25 18:23:41 +02:00
ipcomp.c
…
ipconfig.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2018-06-06 18:39:49 -07:00
ipip.c
net: Drop pernet_operations::async
2018-03-27 13:18:09 -04:00
ipmr_base.c
net: ipmr: fix unresolved entry dumps
2018-10-17 22:35:42 -07:00
ipmr.c
ipv4: Fix potential Spectre v1 vulnerability
2019-01-09 17:38:31 +01:00
Kconfig
net: remove blank lines at end of file
2018-07-24 14:10:43 -07:00
Makefile
net: remove blank lines at end of file
2018-07-24 14:10:43 -07:00
metrics.c
net: metrics: add proper netlink validation
2018-06-05 12:29:43 -04:00
netfilter.c
netfilter: utils: move nf_ip_checksum* from ipv4 to utils
2018-07-16 17:51:48 +02:00
netlink.c
ipv4: Add ICMPv6 support when parse route ipproto
2019-03-10 07:17:17 +01:00
ping.c
net: add helpers checking if socket can be bound to nonlocal address
2018-08-01 09:50:04 -07:00
proc.c
tcp: tcp_fragment() should apply sane memory limits
2019-06-17 19:51:56 +02:00
protocol.c
…
raw_diag.c
…
raw.c
ipv4: Fix raw socket lookup for local traffic
2019-05-16 19:41:29 +02:00
route.c
ipv4: not do cache for local delivery if bc_forwarding is enabled
2019-06-11 12:20:47 +02:00
syncookies.c
tcp: handle inet_csk_reqsk_queue_add() failures
2019-03-19 13:12:39 +01:00
sysctl_net_ipv4.c
tcp: add tcp_min_snd_mss sysctl
2019-06-17 19:51:56 +02:00
tcp_bbr.c
tcp_bbr: apply PROBE_RTT cwnd cap even if acked==0
2018-08-22 21:45:32 -07:00
tcp_bic.c
…
tcp_cdg.c
…
tcp_cong.c
…
tcp_cubic.c
…
tcp_dctcp.c
tcp: Ensure DCTCP reacts to losses
2019-04-17 08:38:41 +02:00
tcp_diag.c
…
tcp_fastopen.c
…
tcp_highspeed.c
…
tcp_htcp.c
…
tcp_hybla.c
…
tcp_illinois.c
…
tcp_input.c
tcp: limit payload size of sacked skbs
2019-06-17 19:51:56 +02:00
tcp_ipv4.c
tcp: add tcp_min_snd_mss sysctl
2019-06-17 19:51:56 +02:00
tcp_lp.c
…
tcp_metrics.c
net: Drop pernet_operations::async
2018-03-27 13:18:09 -04:00
tcp_minisocks.c
tcp: do not restart timewait timer on rst reception
2018-08-31 23:10:35 -07:00
tcp_nv.c
…
tcp_offload.c
tcp: Don't coalesce decrypted and encrypted SKBs
2018-07-16 00:12:09 -07:00
tcp_output.c
tcp: add tcp_min_snd_mss sysctl
2019-06-17 19:51:56 +02:00
tcp_rate.c
tcp: expose both send and receive intervals for rate sample
2018-07-11 23:01:56 -07:00
tcp_recovery.c
tcp: add stat of data packet reordering events
2018-08-01 09:56:10 -07:00
tcp_scalable.c
…
tcp_timer.c
tcp: enforce tcp_min_snd_mss in tcp_mtu_probing()
2019-06-17 19:51:56 +02:00
tcp_ulp.c
tcp, ulp: fix leftover icsk_ulp_ops preventing sock from reattach
2018-08-16 14:58:08 -07:00
tcp_vegas.c
…
tcp_vegas.h
…
tcp_veno.c
…
tcp_westwood.c
…
tcp_yeah.c
…
tcp.c
tcp: limit payload size of sacked skbs
2019-06-17 19:51:56 +02:00
tunnel4.c
…
udp_diag.c
udp: fix rx queue len reported by diag and proc interface
2018-06-08 19:55:15 -04:00
udp_impl.h
…
udp_offload.c
Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net
2018-07-03 10:29:26 +09:00
udp_tunnel.c
…
udp.c
udp: with udp_segment release on error path
2019-01-31 08:14:33 +01:00
udplite.c
proc: introduce proc_create_net{,_data}
2018-05-16 07:24:30 +02:00
xfrm4_input.c
xfrm: reset transport header back to network header after all input transforms ahave been applied
2018-09-04 10:26:30 +02:00
xfrm4_mode_beet.c
…
xfrm4_mode_transport.c
xfrm: reset transport header back to network header after all input transforms ahave been applied
2018-09-04 10:26:30 +02:00
xfrm4_mode_tunnel.c
xfrm: Verify MAC header exists before overwriting eth_hdr(skb)->h_proto
2018-03-07 10:54:29 +01:00
xfrm4_output.c
net: xfrm: use skb_gso_validate_network_len() to check gso sizes
2018-03-04 17:49:17 -05:00
xfrm4_policy.c
xfrm4: Fix uninitialized memory read in _decode_session4
2019-05-25 18:23:41 +02:00
xfrm4_protocol.c
…
xfrm4_state.c
…
xfrm4_tunnel.c
…