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-rw-r--r--kernel/pid.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/kernel/pid.c b/kernel/pid.c
index a2b4cbb..4b17acd 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -73,10 +73,20 @@ struct pid_namespace init_pid_ns = {
};
EXPORT_SYMBOL_GPL(init_pid_ns);
-int is_global_init(struct task_struct *tsk)
+int is_container_init(struct task_struct *tsk)
{
- return tsk == init_pid_ns.child_reaper;
+ int ret = 0;
+ struct pid *pid;
+
+ rcu_read_lock();
+ pid = task_pid(tsk);
+ if (pid != NULL && pid->numbers[pid->level].nr == 1)
+ ret = 1;
+ rcu_read_unlock();
+
+ return ret;
}
+EXPORT_SYMBOL(is_container_init);
/*
* Note: disable interrupts while the pidmap_lock is held as an
@@ -192,8 +202,7 @@ fastcall void put_pid(struct pid *pid)
if ((atomic_read(&pid->count) == 1) ||
atomic_dec_and_test(&pid->count)) {
kmem_cache_free(ns->pid_cachep, pid);
- if (ns != &init_pid_ns)
- put_pid_ns(ns);
+ put_pid_ns(ns);
}
}
EXPORT_SYMBOL_GPL(put_pid);
@@ -244,9 +253,7 @@ struct pid *alloc_pid(struct pid_namespace *ns)
tmp = tmp->parent;
}
- if (ns != &init_pid_ns)
- get_pid_ns(ns);
-
+ get_pid_ns(ns);
pid->level = ns->level;
pid->nr = pid->numbers[0].nr;
atomic_set(&pid->count, 1);
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