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-rw-r--r--include/linux/sched/signal.h2
-rw-r--r--kernel/fork.c27
-rw-r--r--kernel/signal.c14
3 files changed, 31 insertions, 12 deletions
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index b55fd293c1e5..ae2b0b81be25 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -385,6 +385,8 @@ static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
}
+void task_join_group_stop(struct task_struct *task);
+
#ifdef TIF_RESTORE_SIGMASK
/*
* Legacy restore_sigmask accessors. These are inefficient on
diff --git a/kernel/fork.c b/kernel/fork.c
index 22d4cdb9a7ca..ab731e15a600 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1934,18 +1934,20 @@ static __latent_entropy struct task_struct *copy_process(
goto bad_fork_cancel_cgroup;
}
- /*
- * Process group and session signals need to be delivered to just the
- * parent before the fork or both the parent and the child after the
- * fork. Restart if a signal comes in before we add the new process to
- * it's process group.
- * A fatal signal pending means that current will exit, so the new
- * thread can't slip out of an OOM kill (or normal SIGKILL).
- */
- recalc_sigpending();
- if (signal_pending(current)) {
- retval = -ERESTARTNOINTR;
- goto bad_fork_cancel_cgroup;
+ if (!(clone_flags & CLONE_THREAD)) {
+ /*
+ * Process group and session signals need to be delivered to just the
+ * parent before the fork or both the parent and the child after the
+ * fork. Restart if a signal comes in before we add the new process to
+ * it's process group.
+ * A fatal signal pending means that current will exit, so the new
+ * thread can't slip out of an OOM kill (or normal SIGKILL).
+ */
+ recalc_sigpending();
+ if (signal_pending(current)) {
+ retval = -ERESTARTNOINTR;
+ goto bad_fork_cancel_cgroup;
+ }
}
@@ -1982,6 +1984,7 @@ static __latent_entropy struct task_struct *copy_process(
current->signal->nr_threads++;
atomic_inc(&current->signal->live);
atomic_inc(&current->signal->sigcnt);
+ task_join_group_stop(p);
list_add_tail_rcu(&p->thread_group,
&p->group_leader->thread_group);
list_add_tail_rcu(&p->thread_node,
diff --git a/kernel/signal.c b/kernel/signal.c
index 1e06f1eba363..9f0eafb6d474 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -373,6 +373,20 @@ static bool task_participate_group_stop(struct task_struct *task)
return false;
}
+void task_join_group_stop(struct task_struct *task)
+{
+ /* Have the new thread join an on-going signal group stop */
+ unsigned long jobctl = current->jobctl;
+ if (jobctl & JOBCTL_STOP_PENDING) {
+ struct signal_struct *sig = current->signal;
+ unsigned long signr = jobctl & JOBCTL_STOP_SIGMASK;
+ unsigned long gstop = JOBCTL_STOP_PENDING | JOBCTL_STOP_CONSUME;
+ if (task_set_jobctl_pending(task, signr | gstop)) {
+ sig->group_stop_count++;
+ }
+ }
+}
+
/*
* allocate a new signal queue record
* - this may be called without locks if and only if t == current, otherwise an