Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm

[linux-flexiantxendom0-3.2.10.git] / kernel / utsname.c

diff --git a/kernel/utsname.c b/kernel/utsname.c
index a7b3a8d..405caf9 100644 (file)
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -9,12 +9,13 @@
  *  License.
  */
 
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/uts.h>
 #include <linux/utsname.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/user_namespace.h>
+#include <linux/proc_fs.h>
 
 static struct uts_namespace *create_uts_ns(void)
 {
@@ -31,7 +32,8 @@ static struct uts_namespace *create_uts_ns(void)
  * @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)
+static struct uts_namespace *clone_uts_ns(struct task_struct *tsk,
+                                         struct uts_namespace *old_ns)
 {
        struct uts_namespace *ns;
 
@@ -41,8 +43,7 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
 
        down_read(&uts_sem);
        memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
-       ns->user_ns = old_ns->user_ns;
-       get_user_ns(ns->user_ns);
+       ns->user_ns = get_user_ns(task_cred_xxx(tsk, user)->user_ns);
        up_read(&uts_sem);
        return ns;
 }
@@ -53,8 +54,10 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
  * utsname of this process won't be seen by parent, and vice
  * versa.
  */
-struct uts_namespace *copy_utsname(unsigned long flags, struct uts_namespace *old_ns)
+struct uts_namespace *copy_utsname(unsigned long flags,
+                                  struct task_struct *tsk)
 {
+       struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
        struct uts_namespace *new_ns;
 
        BUG_ON(!old_ns);
@@ -63,7 +66,7 @@ struct uts_namespace *copy_utsname(unsigned long flags, struct uts_namespace *ol
        if (!(flags & CLONE_NEWUTS))
                return old_ns;
 
-       new_ns = clone_uts_ns(old_ns);
+       new_ns = clone_uts_ns(tsk, old_ns);
 
        put_uts_ns(old_ns);
        return new_ns;
@@ -77,3 +80,41 @@ void free_uts_ns(struct kref *kref)
        put_user_ns(ns->user_ns);
        kfree(ns);
 }
+
+static void *utsns_get(struct task_struct *task)
+{
+       struct uts_namespace *ns = NULL;
+       struct nsproxy *nsproxy;
+
+       rcu_read_lock();
+       nsproxy = task_nsproxy(task);
+       if (nsproxy) {
+               ns = nsproxy->uts_ns;
+               get_uts_ns(ns);
+       }
+       rcu_read_unlock();
+
+       return ns;
+}
+
+static void utsns_put(void *ns)
+{
+       put_uts_ns(ns);
+}
+
+static int utsns_install(struct nsproxy *nsproxy, void *ns)
+{
+       get_uts_ns(ns);
+       put_uts_ns(nsproxy->uts_ns);
+       nsproxy->uts_ns = ns;
+       return 0;
+}
+
+const struct proc_ns_operations utsns_operations = {
+       .name           = "uts",
+       .type           = CLONE_NEWUTS,
+       .get            = utsns_get,
+       .put            = utsns_put,
+       .install        = utsns_install,
+};
+