From: Peter Oskolkov <posk@google.com>
Date: Fri, 21 Sep 2018 11:17:16 -0700
Subject: net/ipfrag: let ip[6]frag_high_thresh in ns be higher than in init_net
Patch-mainline: v4.20-rc1
Git-commit: 83619623929815a76fa7af49309d2cdfcf024fd3
References: CVE-2018-5391 bsc#1103097

Currently, ip[6]frag_high_thresh sysctl values in new namespaces are
hard-limited to those of the root/init ns.

There are at least two use cases when it would be desirable to
set the high_thresh values higher in a child namespace vs the global hard
limit:

- a security/ddos protection policy may lower the thresholds in the
  root/init ns but allow for a special exception in a child namespace
- testing: a test running in a namespace may want to set these
  thresholds higher in its namespace than what is in the root/init ns

The new behavior:

 # ip netns add testns
 # ip netns exec testns bash

 # sysctl -w net.ipv4.ipfrag_high_thresh=9000000
 net.ipv4.ipfrag_high_thresh = 9000000

 # sysctl net.ipv4.ipfrag_high_thresh
 net.ipv4.ipfrag_high_thresh = 9000000

 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000
 net.ipv6.ip6frag_high_thresh = 9000000

 # sysctl net.ipv6.ip6frag_high_thresh
 net.ipv6.ip6frag_high_thresh = 9000000

The old behavior:

 # ip netns add testns
 # ip netns exec testns bash

 # sysctl -w net.ipv4.ipfrag_high_thresh=9000000
 net.ipv4.ipfrag_high_thresh = 9000000

 # sysctl net.ipv4.ipfrag_high_thresh
 net.ipv4.ipfrag_high_thresh = 4194304

 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000
 net.ipv6.ip6frag_high_thresh = 9000000

 # sysctl net.ipv6.ip6frag_high_thresh
 net.ipv6.ip6frag_high_thresh = 4194304

Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michal Kubecek <mkubecek@suse.cz>

---
 net/ieee802154/6lowpan/reassembly.c | 1 -
 net/ipv4/ip_fragment.c              | 1 -
 net/ipv6/reassembly.c               | 1 -
 3 files changed, 3 deletions(-)

--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -462,7 +462,6 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
 
 		table[0].data = &ieee802154_lowpan->frags.high_thresh;
 		table[0].extra1 = &ieee802154_lowpan->frags.low_thresh;
-		table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh;
 		table[1].data = &ieee802154_lowpan->frags.low_thresh;
 		table[1].extra2 = &ieee802154_lowpan->frags.high_thresh;
 		table[2].data = &ieee802154_lowpan->frags.timeout;
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -831,7 +831,6 @@ static int __net_init ip4_frags_ns_ctl_register(struct net *net)
 
 		table[0].data = &net->ipv4.frags.high_thresh;
 		table[0].extra1 = &net->ipv4.frags.low_thresh;
-		table[0].extra2 = &init_net.ipv4.frags.high_thresh;
 		table[1].data = &net->ipv4.frags.low_thresh;
 		table[1].extra2 = &net->ipv4.frags.high_thresh;
 		table[2].data = &net->ipv4.frags.timeout;
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -559,7 +559,6 @@ static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
 
 		table[0].data = &net->ipv6.frags.high_thresh;
 		table[0].extra1 = &net->ipv6.frags.low_thresh;
-		table[0].extra2 = &init_net.ipv6.frags.high_thresh;
 		table[1].data = &net->ipv6.frags.low_thresh;
 		table[1].extra2 = &net->ipv6.frags.high_thresh;
 		table[2].data = &net->ipv6.frags.timeout;