2 files changed, 22 insertions, 5 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index ef2dfa818bf1..7838b4d68774 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1097,6 +1097,7 @@ struct wait_opts {
         int __user              *wo_stat;
         struct rusage __user    *wo_rusage;
 
+        wait_queue_t            child_wait;
         int                     notask_error;
 };
 
@@ -1570,20 +1571,35 @@ static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
         return 0;
 }
 
+static int child_wait_callback(wait_queue_t *wait, unsigned mode,
+                                int sync, void *key)
+{
+        struct wait_opts *wo = container_of(wait, struct wait_opts,
+                                                child_wait);
+        struct task_struct *p = key;
+
+        if (!eligible_child(wo, p))
+                return 0;
+
+        return default_wake_function(wait, mode, sync, key);
+}
+
 void __wake_up_parent(struct task_struct *p, struct task_struct *parent)
 {
-        wake_up_interruptible_sync(&parent->signal->wait_chldexit);
+        __wake_up_sync_key(&parent->signal->wait_chldexit,
+                                TASK_INTERRUPTIBLE, 1, p);
 }
 
 static long do_wait(struct wait_opts *wo)
 {
-        DECLARE_WAITQUEUE(wait, current);
         struct task_struct *tsk;
         int retval;
 
         trace_sched_process_wait(wo->wo_pid);
 
-        add_wait_queue(&current->signal->wait_chldexit,&wait);
+        init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
+        wo->child_wait.private = current;
+        add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
 repeat:
         /*
          * If there is nothing that can match our critiera just get out.
@@ -1624,7 +1640,8 @@ notask:
         }
 end:
         __set_current_state(TASK_RUNNING);
-        remove_wait_queue(&current->signal->wait_chldexit,&wait);
+        remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
+
         if (wo->wo_info) {
                 struct siginfo __user *infop = wo->wo_info;
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 417f7c994522..bb230d5d7085 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2411,7 +2411,7 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
         /* Wake up the parent if it is waiting so that it can recheck
          * wait permission to the new task SID. */
         read_lock(&tasklist_lock);
-        wake_up_interruptible(&current->real_parent->signal->wait_chldexit);
+        __wake_up_parent(current, current->real_parent);
         read_unlock(&tasklist_lock);
 }