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authorPaul Moore <paul@paul-moore.com>2016-11-29 16:57:48 -0500
committerPaul Moore <paul@paul-moore.com>2016-12-14 13:06:04 -0500
commitfba143c66abb81307a450679f38ab953fe96a413 (patch)
treec9933c76c704f6751b10b662fc9c8ec4a1682529
parenta09cfa470817ac086cf68418da13a2b91c2744ef (diff)
netns: avoid disabling irq for netns id
Bring back commit bc51dddf98c9 ("netns: avoid disabling irq for netns id") now that we've fixed some audit multicast issues that caused problems with original attempt. Additional information, and history, can be found in the links below: * https://github.com/linux-audit/audit-kernel/issues/22 * https://github.com/linux-audit/audit-kernel/issues/23 Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
-rw-r--r--net/core/net_namespace.c35
1 files changed, 15 insertions, 20 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2c2eb1b629b1..10608dd1489f 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -213,14 +213,13 @@ static void rtnl_net_notifyid(struct net *net, int cmd, int id);
*/
int peernet2id_alloc(struct net *net, struct net *peer)
{
- unsigned long flags;
bool alloc;
int id;
- spin_lock_irqsave(&net->nsid_lock, flags);
+ spin_lock_bh(&net->nsid_lock);
alloc = atomic_read(&peer->count) == 0 ? false : true;
id = __peernet2id_alloc(net, peer, &alloc);
- spin_unlock_irqrestore(&net->nsid_lock, flags);
+ spin_unlock_bh(&net->nsid_lock);
if (alloc && id >= 0)
rtnl_net_notifyid(net, RTM_NEWNSID, id);
return id;
@@ -230,12 +229,11 @@ EXPORT_SYMBOL(peernet2id_alloc);
/* This function returns, if assigned, the id of a peer netns. */
int peernet2id(struct net *net, struct net *peer)
{
- unsigned long flags;
int id;
- spin_lock_irqsave(&net->nsid_lock, flags);
+ spin_lock_bh(&net->nsid_lock);
id = __peernet2id(net, peer);
- spin_unlock_irqrestore(&net->nsid_lock, flags);
+ spin_unlock_bh(&net->nsid_lock);
return id;
}
@@ -249,18 +247,17 @@ bool peernet_has_id(struct net *net, struct net *peer)
struct net *get_net_ns_by_id(struct net *net, int id)
{
- unsigned long flags;
struct net *peer;
if (id < 0)
return NULL;
rcu_read_lock();
- spin_lock_irqsave(&net->nsid_lock, flags);
+ spin_lock_bh(&net->nsid_lock);
peer = idr_find(&net->netns_ids, id);
if (peer)
get_net(peer);
- spin_unlock_irqrestore(&net->nsid_lock, flags);
+ spin_unlock_bh(&net->nsid_lock);
rcu_read_unlock();
return peer;
@@ -404,17 +401,17 @@ static void cleanup_net(struct work_struct *work)
for_each_net(tmp) {
int id;
- spin_lock_irq(&tmp->nsid_lock);
+ spin_lock_bh(&tmp->nsid_lock);
id = __peernet2id(tmp, net);
if (id >= 0)
idr_remove(&tmp->netns_ids, id);
- spin_unlock_irq(&tmp->nsid_lock);
+ spin_unlock_bh(&tmp->nsid_lock);
if (id >= 0)
rtnl_net_notifyid(tmp, RTM_DELNSID, id);
}
- spin_lock_irq(&net->nsid_lock);
+ spin_lock_bh(&net->nsid_lock);
idr_destroy(&net->netns_ids);
- spin_unlock_irq(&net->nsid_lock);
+ spin_unlock_bh(&net->nsid_lock);
}
rtnl_unlock();
@@ -542,7 +539,6 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[NETNSA_MAX + 1];
- unsigned long flags;
struct net *peer;
int nsid, err;
@@ -563,15 +559,15 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
if (IS_ERR(peer))
return PTR_ERR(peer);
- spin_lock_irqsave(&net->nsid_lock, flags);
+ spin_lock_bh(&net->nsid_lock);
if (__peernet2id(net, peer) >= 0) {
- spin_unlock_irqrestore(&net->nsid_lock, flags);
+ spin_unlock_bh(&net->nsid_lock);
err = -EEXIST;
goto out;
}
err = alloc_netid(net, peer, nsid);
- spin_unlock_irqrestore(&net->nsid_lock, flags);
+ spin_unlock_bh(&net->nsid_lock);
if (err >= 0) {
rtnl_net_notifyid(net, RTM_NEWNSID, err);
err = 0;
@@ -693,11 +689,10 @@ static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
.idx = 0,
.s_idx = cb->args[0],
};
- unsigned long flags;
- spin_lock_irqsave(&net->nsid_lock, flags);
+ spin_lock_bh(&net->nsid_lock);
idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
- spin_unlock_irqrestore(&net->nsid_lock, flags);
+ spin_unlock_bh(&net->nsid_lock);
cb->args[0] = net_cb.idx;
return skb->len;