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authorEric W. Biederman <ebiederm@xmission.com>2014-04-24 01:29:27 +0400
committerDavid S. Miller <davem@davemloft.net>2014-04-24 21:44:54 +0400
commit90f62cf30a78721641e08737bda787552428061e (patch)
tree85d43e6c5d8b10fb79fcb9c402217f8eb54bbe12 /net/packet
parentaa4cf9452f469f16cea8c96283b641b4576d4a7b (diff)
downloadlinux-90f62cf30a78721641e08737bda787552428061e.tar.xz
net: Use netlink_ns_capable to verify the permisions of netlink messages
It is possible by passing a netlink socket to a more privileged executable and then to fool that executable into writing to the socket data that happens to be valid netlink message to do something that privileged executable did not intend to do. To keep this from happening replace bare capable and ns_capable calls with netlink_capable, netlink_net_calls and netlink_ns_capable calls. Which act the same as the previous calls except they verify that the opener of the socket had the desired permissions as well. Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/diag.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/packet/diag.c b/net/packet/diag.c
index b34d0de24091..92f2c7107eec 100644
--- a/net/packet/diag.c
+++ b/net/packet/diag.c
@@ -194,7 +194,7 @@ static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
net = sock_net(skb->sk);
req = nlmsg_data(cb->nlh);
- may_report_filterinfo = ns_capable(net->user_ns, CAP_NET_ADMIN);
+ may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
mutex_lock(&net->packet.sklist_lock);
sk_for_each(sk, &net->packet.sklist) {