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ipv6: check sk sk_type and protocol early in ip_mroute_set/getsockopt 

[ Upstream commit 99253eb750fda6a644d5188fb26c43bad8d5a745 ]

Commit 5e1859fbcc ("ipv4: ipmr: various fixes and cleanups") fixed
the issue for ipv4 ipmr:

  ip_mroute_setsockopt() & ip_mroute_getsockopt() should not
  access/set raw_sk(sk)->ipmr_table before making sure the socket
  is a raw socket, and protocol is IGMP

The same fix should be done for ipv6 ipmr as well.

This patch can fix the panic caused by overwriting the same offset
as ipmr_table as in raw_sk(sk) when accessing other type's socket
by ip_mroute_setsockopt().

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: I8d48f4611a2f2d0cb7ad5146036f571f12ecb1fc
CVE-2017-18509
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
This commit is contained in:
Xin Long 2017-02-24 16:29:06 +08:00 committed by Matsvei Niaverau
parent 8dc08ba699
commit 103a20d70a
1 changed files with 8 additions and 3 deletions
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11
net/ipv6/ip6mr.c
View File

@ -1588,6 +1588,10 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
struct net *net = sock_net(sk);
struct mr6_table *mrt;
if (sk->sk_type != SOCK_RAW ||
inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
if (mrt == NULL)
return -ENOENT;
@ -1599,9 +1603,6 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
switch (optname) {
case MRT6_INIT:
if (sk->sk_type != SOCK_RAW ||
inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
if (optlen < sizeof(int))
return -EINVAL;
@ -1722,6 +1723,10 @@ int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
struct net *net = sock_net(sk);
struct mr6_table *mrt;
if (sk->sk_type != SOCK_RAW ||
inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
return -EOPNOTSUPP;
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
if (mrt == NULL)
return -ENOENT;