*/
#include <linux/module.h>
-#include <linux/version.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>
#include <linux/user_namespace.h>
+#include <linux/highuid.h>
+#include <linux/cred.h>
+
+static struct kmem_cache *user_ns_cachep __read_mostly;
/*
- * Clone a new ns copying an original user ns, setting refcount to 1
- * @old_ns: namespace to clone
- * Return NULL on error (failure to kmalloc), new ns otherwise
+ * Create a new user namespace, deriving the creator from the user in the
+ * passed credentials, and replacing that user with the new root user for the
+ * new namespace.
+ *
+ * This is called by copy_creds(), which will finish setting the target task's
+ * credentials.
*/
-static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
+int create_user_ns(struct cred *new)
{
struct user_namespace *ns;
- struct user_struct *new_user;
+ struct user_struct *root_user;
int n;
- ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
+ ns = kmem_cache_alloc(user_ns_cachep, GFP_KERNEL);
if (!ns)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
kref_init(&ns->kref);
for (n = 0; n < UIDHASH_SZ; ++n)
INIT_HLIST_HEAD(ns->uidhash_table + n);
- /* Insert new root user. */
- ns->root_user = alloc_uid(ns, 0);
- if (!ns->root_user) {
- kfree(ns);
- return ERR_PTR(-ENOMEM);
+ /* Alloc new root user. */
+ root_user = alloc_uid(ns, 0);
+ if (!root_user) {
+ kmem_cache_free(user_ns_cachep, ns);
+ return -ENOMEM;
}
- /* Reset current->user with a new one */
- new_user = alloc_uid(ns, current->uid);
- if (!new_user) {
- free_uid(ns->root_user);
- kfree(ns);
- return ERR_PTR(-ENOMEM);
- }
+ /* set the new root user in the credentials under preparation */
+ ns->creator = new->user;
+ new->user = root_user;
+ new->uid = new->euid = new->suid = new->fsuid = 0;
+ new->gid = new->egid = new->sgid = new->fsgid = 0;
+ put_group_info(new->group_info);
+ new->group_info = get_group_info(&init_groups);
+#ifdef CONFIG_KEYS
+ key_put(new->request_key_auth);
+ new->request_key_auth = NULL;
+#endif
+ /* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */
+
+ /* root_user holds a reference to ns, our reference can be dropped */
+ put_user_ns(ns);
+
+ return 0;
+}
+
+/*
+ * Deferred destructor for a user namespace. This is required because
+ * free_user_ns() may be called with uidhash_lock held, but we need to call
+ * back to free_uid() which will want to take the lock again.
+ */
+static void free_user_ns_work(struct work_struct *work)
+{
+ struct user_namespace *ns =
+ container_of(work, struct user_namespace, destroyer);
+ free_uid(ns->creator);
+ kmem_cache_free(user_ns_cachep, ns);
+}
+
+void free_user_ns(struct kref *kref)
+{
+ struct user_namespace *ns =
+ container_of(kref, struct user_namespace, kref);
- switch_uid(new_user);
- return ns;
+ INIT_WORK(&ns->destroyer, free_user_ns_work);
+ schedule_work(&ns->destroyer);
}
+EXPORT_SYMBOL(free_user_ns);
-struct user_namespace * copy_user_ns(int flags, struct user_namespace *old_ns)
+uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t uid)
{
- struct user_namespace *new_ns;
+ struct user_namespace *tmp;
- BUG_ON(!old_ns);
- get_user_ns(old_ns);
+ if (likely(to == cred->user->user_ns))
+ return uid;
- if (!(flags & CLONE_NEWUSER))
- return old_ns;
- new_ns = clone_user_ns(old_ns);
+ /* Is cred->user the creator of the target user_ns
+ * or the creator of one of it's parents?
+ */
+ for ( tmp = to; tmp != &init_user_ns;
+ tmp = tmp->creator->user_ns ) {
+ if (cred->user == tmp->creator) {
+ return (uid_t)0;
+ }
+ }
- put_user_ns(old_ns);
- return new_ns;
+ /* No useful relationship so no mapping */
+ return overflowuid;
}
-void free_user_ns(struct kref *kref)
+gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t gid)
{
- struct user_namespace *ns;
+ struct user_namespace *tmp;
+
+ if (likely(to == cred->user->user_ns))
+ return gid;
- ns = container_of(kref, struct user_namespace, kref);
- release_uids(ns);
- kfree(ns);
+ /* Is cred->user the creator of the target user_ns
+ * or the creator of one of it's parents?
+ */
+ for ( tmp = to; tmp != &init_user_ns;
+ tmp = tmp->creator->user_ns ) {
+ if (cred->user == tmp->creator) {
+ return (gid_t)0;
+ }
+ }
+
+ /* No useful relationship so no mapping */
+ return overflowgid;
}
-EXPORT_SYMBOL(free_user_ns);
+
+static __init int user_namespaces_init(void)
+{
+ user_ns_cachep = KMEM_CACHE(user_namespace, SLAB_PANIC);
+ return 0;
+}
+module_init(user_namespaces_init);