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-rw-r--r--kernel/nsproxy.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index a05d191ffdd9..5424e37673ed 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -22,6 +22,9 @@
#include <linux/pid_namespace.h>
#include <net/net_namespace.h>
#include <linux/ipc_namespace.h>
+#include <linux/proc_fs.h>
+#include <linux/file.h>
+#include <linux/syscalls.h>
static struct kmem_cache *nsproxy_cachep;
@@ -233,6 +236,45 @@ void exit_task_namespaces(struct task_struct *p)
switch_task_namespaces(p, NULL);
}
+SYSCALL_DEFINE2(setns, int, fd, int, nstype)
+{
+ const struct proc_ns_operations *ops;
+ struct task_struct *tsk = current;
+ struct nsproxy *new_nsproxy;
+ struct proc_inode *ei;
+ struct file *file;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ file = proc_ns_fget(fd);
+ if (IS_ERR(file))
+ return PTR_ERR(file);
+
+ err = -EINVAL;
+ ei = PROC_I(file->f_dentry->d_inode);
+ ops = ei->ns_ops;
+ if (nstype && (ops->type != nstype))
+ goto out;
+
+ new_nsproxy = create_new_namespaces(0, tsk, tsk->fs);
+ if (IS_ERR(new_nsproxy)) {
+ err = PTR_ERR(new_nsproxy);
+ goto out;
+ }
+
+ err = ops->install(new_nsproxy, ei->ns);
+ if (err) {
+ free_nsproxy(new_nsproxy);
+ goto out;
+ }
+ switch_task_namespaces(tsk, new_nsproxy);
+out:
+ fput(file);
+ return err;
+}
+
static int __init nsproxy_cache_init(void)
{
nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC);