[PATCH 2/2] Propagate the long_clone_arg up to the create_new_namespaces

[Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>]

The first user for the long_clone_arg is the namespaces code,
so pull the extended argument up to the namespaces creation
function.

Signed-off-by: Pavel Emelyanov <xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
Signed-off-by: Cedric Le Goater <clg-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Serge Hallyn <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

---

diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index 0e66b57..ad93b19 100644
--- a/include/linux/nsproxy.h
+++ b/include/linux/nsproxy.h
@@ -62,12 +62,13 @@ static inline struct nsproxy *task_nsproxy(struct task_struct *tsk)
 	return rcu_dereference(tsk->nsproxy);
 }
 
-int copy_namespaces(unsigned long flags, struct task_struct *tsk);
+int copy_namespaces(unsigned long flags, struct task_struct *tsk,
+		struct long_clone_arg *carg);
 void exit_task_namespaces(struct task_struct *tsk);
 void switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new);
 void free_nsproxy(struct nsproxy *ns);
 int unshare_nsproxy_namespaces(unsigned long, struct nsproxy **,
-	struct fs_struct *);
+	struct fs_struct *, struct long_clone_arg *carg);
 
 static inline void put_nsproxy(struct nsproxy *ns)
 {
diff --git a/kernel/fork.c b/kernel/fork.c
index 19873c7..5e85567 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1160,7 +1199,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		goto bad_fork_cleanup_signal;
 	if ((retval = copy_keys(clone_flags, p)))
 		goto bad_fork_cleanup_mm;
-	if ((retval = copy_namespaces(clone_flags, p)))
+	if ((retval = copy_namespaces(clone_flags, p, carg)))
 		goto bad_fork_cleanup_keys;
 	retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
 	if (retval)
@@ -1705,7 +1753,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
 	if ((err = unshare_semundo(unshare_flags, &new_ulist)))
 		goto bad_unshare_cleanup_fd;
 	if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy,
-			new_fs)))
+			new_fs, carg)))
 		goto bad_unshare_cleanup_semundo;
 
 	if (new_fs ||  new_mm || new_fd || new_ulist || new_nsproxy) {
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index f5d332c..5fd4a03 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -48,7 +48,8 @@ static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig)
  * leave it to the caller to do proper locking and attach it to task.
  */
 static struct nsproxy *create_new_namespaces(unsigned long flags,
-			struct task_struct *tsk, struct fs_struct *new_fs)
+			struct task_struct *tsk, struct fs_struct *new_fs,
+			struct long_clone_arg *carg)
 {
 	struct nsproxy *new_nsp;
 	int err;
@@ -119,7 +120,8 @@ out_ns:
  * called from clone.  This now handles copy for nsproxy and all
  * namespaces therein.
  */
-int copy_namespaces(unsigned long flags, struct task_struct *tsk)
+int copy_namespaces(unsigned long flags, struct task_struct *tsk,
+		struct long_clone_arg *carg)
 {
 	struct nsproxy *old_ns = tsk->nsproxy;
 	struct nsproxy *new_ns;
@@ -131,7 +133,8 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
 	get_nsproxy(old_ns);
 
 	if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-				CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET)))
+				CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET |
+				CLONE_LONGARG)))
 		return 0;
 
 	if (!capable(CAP_SYS_ADMIN)) {
@@ -139,7 +142,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
 		goto out;
 	}
 
-	new_ns = create_new_namespaces(flags, tsk, tsk->fs);
+	new_ns = create_new_namespaces(flags, tsk, tsk->fs, carg);
 	if (IS_ERR(new_ns)) {
 		err = PTR_ERR(new_ns);
 		goto out;
@@ -179,19 +182,20 @@ void free_nsproxy(struct nsproxy *ns)
  * On success, returns the new nsproxy.
  */
 int unshare_nsproxy_namespaces(unsigned long unshare_flags,
-		struct nsproxy **new_nsp, struct fs_struct *new_fs)
+		struct nsproxy **new_nsp, struct fs_struct *new_fs,
+		struct long_clone_arg *carg)
 {
 	int err = 0;
 
 	if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-			       CLONE_NEWUSER | CLONE_NEWNET)))
+			       CLONE_NEWUSER | CLONE_NEWNET | CLONE_LONGARG)))
 		return 0;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
 	*new_nsp = create_new_namespaces(unshare_flags, current,
-				new_fs ? new_fs : current->fs);
+				new_fs ? new_fs : current->fs, carg);
 	if (IS_ERR(*new_nsp)) {
 		err = PTR_ERR(*new_nsp);
 		goto out;