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Diffstat (limited to 'net/core/net_namespace.c')
-rw-r--r--net/core/net_namespace.c109
1 files changed, 74 insertions, 35 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 0e950fda9a0..85b62691f4f 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -1,3 +1,5 @@
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/workqueue.h>
#include <linux/rtnetlink.h>
#include <linux/cache.h>
@@ -8,9 +10,11 @@
#include <linux/idr.h>
#include <linux/rculist.h>
#include <linux/nsproxy.h>
-#include <linux/proc_fs.h>
+#include <linux/fs.h>
+#include <linux/proc_ns.h>
#include <linux/file.h>
#include <linux/export.h>
+#include <linux/user_namespace.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
@@ -20,12 +24,14 @@
static LIST_HEAD(pernet_list);
static struct list_head *first_device = &pernet_list;
-static DEFINE_MUTEX(net_mutex);
+DEFINE_MUTEX(net_mutex);
LIST_HEAD(net_namespace_list);
EXPORT_SYMBOL_GPL(net_namespace_list);
-struct net init_net;
+struct net init_net = {
+ .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head),
+};
EXPORT_SYMBOL(init_net);
#define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */
@@ -83,21 +89,29 @@ assign:
static int ops_init(const struct pernet_operations *ops, struct net *net)
{
- int err;
+ int err = -ENOMEM;
+ void *data = NULL;
+
if (ops->id && ops->size) {
- void *data = kzalloc(ops->size, GFP_KERNEL);
+ data = kzalloc(ops->size, GFP_KERNEL);
if (!data)
- return -ENOMEM;
+ goto out;
err = net_assign_generic(net, *ops->id, data);
- if (err) {
- kfree(data);
- return err;
- }
+ if (err)
+ goto cleanup;
}
+ err = 0;
if (ops->init)
- return ops->init(net);
- return 0;
+ err = ops->init(net);
+ if (!err)
+ return 0;
+
+cleanup:
+ kfree(data);
+
+out:
+ return err;
}
static void ops_free(const struct pernet_operations *ops, struct net *net)
@@ -133,7 +147,7 @@ static void ops_free_list(const struct pernet_operations *ops,
/*
* setup_net runs the initializers for the network namespace object.
*/
-static __net_init int setup_net(struct net *net)
+static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
{
/* Must be called with net_mutex held */
const struct pernet_operations *ops, *saved_ops;
@@ -143,6 +157,7 @@ static __net_init int setup_net(struct net *net)
atomic_set(&net->count, 1);
atomic_set(&net->passive, 1);
net->dev_base_seq = 1;
+ net->user_ns = user_ns;
#ifdef NETNS_REFCNT_DEBUG
atomic_set(&net->use_count, 0);
@@ -204,8 +219,8 @@ static void net_free(struct net *net)
{
#ifdef NETNS_REFCNT_DEBUG
if (unlikely(atomic_read(&net->use_count) != 0)) {
- printk(KERN_EMERG "network namespace not free! Usage: %d\n",
- atomic_read(&net->use_count));
+ pr_emerg("network namespace not free! Usage: %d\n",
+ atomic_read(&net->use_count));
return;
}
#endif
@@ -220,7 +235,8 @@ void net_drop_ns(void *p)
net_free(ns);
}
-struct net *copy_net_ns(unsigned long flags, struct net *old_net)
+struct net *copy_net_ns(unsigned long flags,
+ struct user_namespace *user_ns, struct net *old_net)
{
struct net *net;
int rv;
@@ -231,8 +247,11 @@ struct net *copy_net_ns(unsigned long flags, struct net *old_net)
net = net_alloc();
if (!net)
return ERR_PTR(-ENOMEM);
+
+ get_user_ns(user_ns);
+
mutex_lock(&net_mutex);
- rv = setup_net(net);
+ rv = setup_net(net, user_ns);
if (rv == 0) {
rtnl_lock();
list_add_tail_rcu(&net->list, &net_namespace_list);
@@ -240,6 +259,7 @@ struct net *copy_net_ns(unsigned long flags, struct net *old_net)
}
mutex_unlock(&net_mutex);
if (rv < 0) {
+ put_user_ns(user_ns);
net_drop_ns(net);
return ERR_PTR(rv);
}
@@ -253,7 +273,7 @@ static void cleanup_net(struct work_struct *work)
{
const struct pernet_operations *ops;
struct net *net, *tmp;
- LIST_HEAD(net_kill_list);
+ struct list_head net_kill_list;
LIST_HEAD(net_exit_list);
/* Atomically snapshot the list of namespaces to cleanup */
@@ -296,6 +316,7 @@ static void cleanup_net(struct work_struct *work)
/* Finally it is safe to free my network namespace structure */
list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
list_del_init(&net->exit_list);
+ put_user_ns(net->user_ns);
net_drop_ns(net);
}
}
@@ -316,7 +337,7 @@ EXPORT_SYMBOL_GPL(__put_net);
struct net *get_net_ns_by_fd(int fd)
{
- struct proc_inode *ei;
+ struct proc_ns *ei;
struct file *file;
struct net *net;
@@ -324,7 +345,7 @@ struct net *get_net_ns_by_fd(int fd)
if (IS_ERR(file))
return ERR_CAST(file);
- ei = PROC_I(file->f_dentry->d_inode);
+ ei = get_proc_ns(file_inode(file));
if (ei->ns_ops == &netns_operations)
net = get_net(ei->ns);
else
@@ -335,13 +356,6 @@ struct net *get_net_ns_by_fd(int fd)
}
#else
-struct net *copy_net_ns(unsigned long flags, struct net *old_net)
-{
- if (flags & CLONE_NEWNET)
- return ERR_PTR(-EINVAL);
- return old_net;
-}
-
struct net *get_net_ns_by_fd(int fd)
{
return ERR_PTR(-EINVAL);
@@ -368,6 +382,21 @@ struct net *get_net_ns_by_pid(pid_t pid)
}
EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
+static __net_init int net_ns_net_init(struct net *net)
+{
+ return proc_alloc_inum(&net->proc_inum);
+}
+
+static __net_exit void net_ns_net_exit(struct net *net)
+{
+ proc_free_inum(net->proc_inum);
+}
+
+static struct pernet_operations __net_initdata net_ns_ops = {
+ .init = net_ns_net_init,
+ .exit = net_ns_net_exit,
+};
+
static int __init net_ns_init(void)
{
struct net_generic *ng;
@@ -390,7 +419,7 @@ static int __init net_ns_init(void)
rcu_assign_pointer(init_net.gen, ng);
mutex_lock(&net_mutex);
- if (setup_net(&init_net))
+ if (setup_net(&init_net, &init_user_ns))
panic("Could not setup the initial network namespace");
rtnl_lock();
@@ -399,6 +428,8 @@ static int __init net_ns_init(void)
mutex_unlock(&net_mutex);
+ register_pernet_subsys(&net_ns_ops);
+
return 0;
}
@@ -448,12 +479,7 @@ static void __unregister_pernet_operations(struct pernet_operations *ops)
static int __register_pernet_operations(struct list_head *list,
struct pernet_operations *ops)
{
- int err = 0;
- err = ops_init(ops, &init_net);
- if (err)
- ops_free(ops, &init_net);
- return err;
-
+ return ops_init(ops, &init_net);
}
static void __unregister_pernet_operations(struct pernet_operations *ops)
@@ -622,16 +648,29 @@ static void netns_put(void *ns)
static int netns_install(struct nsproxy *nsproxy, void *ns)
{
+ struct net *net = ns;
+
+ if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) ||
+ !ns_capable(current_user_ns(), CAP_SYS_ADMIN))
+ return -EPERM;
+
put_net(nsproxy->net_ns);
- nsproxy->net_ns = get_net(ns);
+ nsproxy->net_ns = get_net(net);
return 0;
}
+static unsigned int netns_inum(void *ns)
+{
+ struct net *net = ns;
+ return net->proc_inum;
+}
+
const struct proc_ns_operations netns_operations = {
.name = "net",
.type = CLONE_NEWNET,
.get = netns_get,
.put = netns_put,
.install = netns_install,
+ .inum = netns_inum,
};
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 20:38:51 +0000