diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/nsproxy.c | 42 |
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); |