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userns: make each net (net_ns) belong to a user_ns 

The user namespace which creates a new network namespace owns that
namespace and all resources created in it.  This way we can target
capability checks for privileged operations against network resources to
the user_ns which created the network namespace in which the resource
lives.  Privilege to the user namespace which owns the network
namespace, or any parent user namespace thereof, provides the same
privilege to the network resource.

This patch is reworked from a version originally by
Serge E. Hallyn <serge.hallyn@canonical.com>

Change-Id: Ifa426537c47cce669099cc96e80b17e1d814457b
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-06-14 02:31:10 -07:00 committed by Artem Borisov
parent 8b4596c91f
commit d621e5dc9c
3 changed files with 20 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/net/net_namespace.h
View File

@ -22,6 +22,7 @@
#endif
#include <net/netns/xfrm.h>
struct user_namespace;
struct proc_dir_entry;
struct net_device;
struct sock;
@ -52,6 +53,8 @@ struct net {
struct list_head cleanup_list; /* namespaces on death row */
struct list_head exit_list; /* Use only net_mutex */
struct user_namespace *user_ns; /* Owning user namespace */
unsigned int proc_inum;
struct proc_dir_entry *proc_net;
@ -112,10 +115,12 @@ struct net {
extern struct net init_net;
#ifdef CONFIG_NET
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
extern struct net *copy_net_ns(unsigned long flags,
struct user_namespace *user_ns, struct net *net_ns);
#else /* CONFIG_NET */
static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
static inline struct net *copy_net_ns(unsigned long flags,
struct user_namespace *user_ns, struct net *net_ns)
{
/* There is nothing to copy so this is a noop */
return net_ns;

2
kernel/nsproxy.c
View File

@ -90,7 +90,7 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
goto out_pid;
}
new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
new_nsp->net_ns = copy_net_ns(flags, task_cred_xxx(tsk, user_ns), tsk->nsproxy->net_ns);
if (IS_ERR(new_nsp->net_ns)) {
err = PTR_ERR(new_nsp->net_ns);
goto out_net;

16
net/core/net_namespace.c
View File

@ -11,6 +11,7 @@
#include <linux/proc_fs.h>
#include <linux/file.h>
#include <linux/export.h>
#include <linux/user_namespace.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
@ -141,7 +142,7 @@ 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;
@ -151,6 +152,7 @@ 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);
@ -228,7 +230,8 @@ 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;
@ -239,8 +242,11 @@ 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);
@ -248,6 +254,7 @@ 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);
}
@ -304,6 +311,7 @@ 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);
}
}
@ -413,7 +421,7 @@ 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();