1 files changed, 19 insertions, 10 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 79f52b85d6ed..537394b25e8d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -547,7 +547,7 @@ static inline void reparent_thread(task_t *p, task_t *father, int traced)
 
         if (p->pdeath_signal)
                 /* We already hold the tasklist_lock here.  */
-                group_send_sig_info(p->pdeath_signal, (void *) 0, p);
+                group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
 
         /* Move the child from its dying parent to the new one.  */
         if (unlikely(traced)) {
@@ -591,8 +591,8 @@ static inline void reparent_thread(task_t *p, task_t *father, int traced)
                 int pgrp = process_group(p);
 
                 if (will_become_orphaned_pgrp(pgrp, NULL) && has_stopped_jobs(pgrp)) {
-                        __kill_pg_info(SIGHUP, (void *)1, pgrp);
-                        __kill_pg_info(SIGCONT, (void *)1, pgrp);
+                        __kill_pg_info(SIGHUP, SEND_SIG_PRIV, pgrp);
+                        __kill_pg_info(SIGCONT, SEND_SIG_PRIV, pgrp);
                 }
         }
 }
@@ -727,8 +727,8 @@ static void exit_notify(struct task_struct *tsk)
             (t->signal->session == tsk->signal->session) &&
             will_become_orphaned_pgrp(process_group(tsk), tsk) &&
             has_stopped_jobs(process_group(tsk))) {
-                __kill_pg_info(SIGHUP, (void *)1, process_group(tsk));
-                __kill_pg_info(SIGCONT, (void *)1, process_group(tsk));
+                __kill_pg_info(SIGHUP, SEND_SIG_PRIV, process_group(tsk));
+                __kill_pg_info(SIGCONT, SEND_SIG_PRIV, process_group(tsk));
         }
 
         /* Let father know we died 
@@ -783,10 +783,6 @@ static void exit_notify(struct task_struct *tsk)
         /* If the process is dead, release it - nobody will wait for it */
         if (state == EXIT_DEAD)
                 release_task(tsk);
-
-        /* PF_DEAD causes final put_task_struct after we schedule. */
-        preempt_disable();
-        tsk->flags |= PF_DEAD;
 }
 
 fastcall NORET_TYPE void do_exit(long code)
@@ -873,7 +869,11 @@ fastcall NORET_TYPE void do_exit(long code)
         tsk->mempolicy = NULL;
 #endif
 
-        BUG_ON(!(current->flags & PF_DEAD));
+        /* PF_DEAD causes final put_task_struct after we schedule. */
+        preempt_disable();
+        BUG_ON(tsk->flags & PF_DEAD);
+        tsk->flags |= PF_DEAD;
+
         schedule();
         BUG();
         /* Avoid "noreturn function does return".  */
@@ -1383,6 +1383,15 @@ repeat:
 
                         switch (p->state) {
                         case TASK_TRACED:
+                                /*
+                                 * When we hit the race with PTRACE_ATTACH,
+                                 * we will not report this child.  But the
+                                 * race means it has not yet been moved to
+                                 * our ptrace_children list, so we need to
+                                 * set the flag here to avoid a spurious ECHILD
+                                 * when the race happens with the only child.
+                                 */
+                                flag = 1;
                                 if (!my_ptrace_child(p))
                                         continue;
                                 /*FALLTHROUGH*/