pidns: guarantee that the pidns init will be the last pidns process reaped

Today we have a twofold bug.  Sometimes release_task on pid == 1 in a pid
namespace can run before other processes in a pid namespace have had
release task called.  With the result that pid_ns_release_proc can be
called before the last proc_flus_task() is done using upid->ns->proc_mnt,
resulting in the use of a stale pointer.  This same set of circumstances
can lead to waitpid(...) returning for a processes started with
clone(CLONE_NEWPID) before the every process in the pid namespace has
actually exited.

To fix this modify zap_pid_ns_processess wait until all other processes in
the pid namespace have exited, even EXIT_DEAD zombies.

The delay_group_leader and related tests ensure that the thread gruop
leader will be the last thread of a process group to be reaped, or to
become EXIT_DEAD and self reap.  With the change to zap_pid_ns_processes
we get the guarantee that pid == 1 in a pid namespace will be the last
task that release_task is called on.

With pid == 1 being the last task to pass through release_task
pid_ns_release_proc can no longer be called too early nor can wait return
before all of the EXIT_DEAD tasks in a pid namespace have exited.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Louis Rilling <louis.rilling@kerlabs.com>
Cc: Mike Galbraith <efault@gmx.de>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Tested-by: Andrew Wagin <avagin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/exit.c b/kernel/exit.c
index c0277d3..a85efd2 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -64,7 +64,6 @@ static void exit_mm(struct task_struct * tsk);
 static void __unhash_process(struct task_struct *p, bool group_dead)
 {
        nr_threads--;
-       detach_pid(p, PIDTYPE_PID);
        if (group_dead) {
                detach_pid(p, PIDTYPE_PGID);
                detach_pid(p, PIDTYPE_SID);
@@ -72,7 +71,20 @@ static void __unhash_process(struct task_struct *p, bool group_dead)
                list_del_rcu(&p->tasks);
                list_del_init(&p->sibling);
                __this_cpu_dec(process_counts);
+               /*
+                * If we are the last child process in a pid namespace to be
+                * reaped, notify the reaper sleeping zap_pid_ns_processes().
+                */
+               if (IS_ENABLED(CONFIG_PID_NS)) {
+                       struct task_struct *parent = p->real_parent;
+
+                       if ((task_active_pid_ns(p)->child_reaper == parent) &&
+                           list_empty(&parent->children) &&
+                           (parent->flags & PF_EXITING))
+                               wake_up_process(parent);
+               }
        }
+       detach_pid(p, PIDTYPE_PID);
        list_del_rcu(&p->thread_group);
 }
 

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 16b20e3..b3c7fd5 100644 (file)
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -184,11 +184,31 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
        }
        read_unlock(&tasklist_lock);
 
+       /* Firstly reap the EXIT_ZOMBIE children we may have. */
        do {
                clear_thread_flag(TIF_SIGPENDING);
                rc = sys_wait4(-1, NULL, __WALL, NULL);
        } while (rc != -ECHILD);
 
+       /*
+        * sys_wait4() above can't reap the TASK_DEAD children.
+        * Make sure they all go away, see __unhash_process().
+        */
+       for (;;) {
+               bool need_wait = false;
+
+               read_lock(&tasklist_lock);
+               if (!list_empty(&current->children)) {
+                       __set_current_state(TASK_UNINTERRUPTIBLE);
+                       need_wait = true;
+               }
+               read_unlock(&tasklist_lock);
+
+               if (!need_wait)
+                       break;
+               schedule();
+       }
+
        if (pid_ns->reboot)
                current->signal->group_exit_code = pid_ns->reboot;