diff options
Diffstat (limited to 'recipes-kernel/linux/linux-hierofalcon-3.19')
-rw-r--r-- | recipes-kernel/linux/linux-hierofalcon-3.19/ipv6-CVE-2015-2922.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-hierofalcon-3.19/ipv6-CVE-2015-2922.patch b/recipes-kernel/linux/linux-hierofalcon-3.19/ipv6-CVE-2015-2922.patch new file mode 100644 index 0000000..728578f --- /dev/null +++ b/recipes-kernel/linux/linux-hierofalcon-3.19/ipv6-CVE-2015-2922.patch | |||
@@ -0,0 +1,55 @@ | |||
1 | From c85b2d7e9fa44286feaac33031db1dd0e4c9ed3b Mon Sep 17 00:00:00 2001 | ||
2 | From: "D.S. Ljungmark" <ljungmark@modio.se> | ||
3 | Date: Wed, 25 Mar 2015 09:28:15 +0100 | ||
4 | Subject: ipv6: Don't reduce hop limit for an interface | ||
5 | |||
6 | [ Upstream commit 6fd99094de2b83d1d4c8457f2c83483b2828e75a ] | ||
7 | |||
8 | A local route may have a lower hop_limit set than global routes do. | ||
9 | |||
10 | RFC 3756, Section 4.2.7, "Parameter Spoofing" | ||
11 | |||
12 | > 1. The attacker includes a Current Hop Limit of one or another small | ||
13 | > number which the attacker knows will cause legitimate packets to | ||
14 | > be dropped before they reach their destination. | ||
15 | |||
16 | > As an example, one possible approach to mitigate this threat is to | ||
17 | > ignore very small hop limits. The nodes could implement a | ||
18 | > configurable minimum hop limit, and ignore attempts to set it below | ||
19 | > said limit. | ||
20 | |||
21 | Fixes CVE-2015-2922 | ||
22 | Upstream-Status: Backport | ||
23 | |||
24 | Signed-off-by: D.S. Ljungmark <ljungmark@modio.se> | ||
25 | Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> | ||
26 | Signed-off-by: David S. Miller <davem@davemloft.net> | ||
27 | Signed-off-by: Sasha Levin <sasha.levin@oracle.com> | ||
28 | Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com> | ||
29 | --- | ||
30 | net/ipv6/ndisc.c | 9 ++++++++- | ||
31 | 1 file changed, 8 insertions(+), 1 deletion(-) | ||
32 | |||
33 | diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c | ||
34 | index 4cb45c1..a46c504 100644 | ||
35 | --- a/net/ipv6/ndisc.c | ||
36 | +++ b/net/ipv6/ndisc.c | ||
37 | @@ -1215,7 +1215,14 @@ static void ndisc_router_discovery(struct sk_buff *skb) | ||
38 | if (rt) | ||
39 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); | ||
40 | if (ra_msg->icmph.icmp6_hop_limit) { | ||
41 | - in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | ||
42 | + /* Only set hop_limit on the interface if it is higher than | ||
43 | + * the current hop_limit. | ||
44 | + */ | ||
45 | + if (in6_dev->cnf.hop_limit < ra_msg->icmph.icmp6_hop_limit) { | ||
46 | + in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | ||
47 | + } else { | ||
48 | + ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than current\n"); | ||
49 | + } | ||
50 | if (rt) | ||
51 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, | ||
52 | ra_msg->icmph.icmp6_hop_limit); | ||
53 | -- | ||
54 | cgit v0.11.2 | ||
55 | |||