#include <linux/uts.h>
#include <linux/utsname.h>
#include <linux/version.h>
+#include <linux/err.h>
+
+/*
+ * Clone a new ns copying an original utsname, setting refcount to 1
+ * @old_ns: namespace to clone
+ * Return NULL on error (failure to kmalloc), new ns otherwise
+ */
+static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
+{
+ struct uts_namespace *ns;
+
+ ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
+ if (!ns)
+ return ERR_PTR(-ENOMEM);
+
+ down_read(&uts_sem);
+ memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
+ up_read(&uts_sem);
+ kref_init(&ns->kref);
+ return ns;
+}
/*
* Copy task tsk's utsname namespace, or clone it if flags
* utsname of this process won't be seen by parent, and vice
* versa.
*/
-int copy_utsname(int flags, struct task_struct *tsk)
+struct uts_namespace *copy_utsname(unsigned long flags, struct uts_namespace *old_ns)
{
- struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
- int err = 0;
-
- if (!old_ns)
- return 0;
+ struct uts_namespace *new_ns;
+ BUG_ON(!old_ns);
get_uts_ns(old_ns);
- return err;
+ if (!(flags & CLONE_NEWUTS))
+ return old_ns;
+
+ new_ns = clone_uts_ns(old_ns);
+
+ put_uts_ns(old_ns);
+ return new_ns;
}
void free_uts_ns(struct kref *kref)