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-rw-r--r--include/linux/ptrace.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index b546fd6c3506..bb157bdd0c55 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -151,6 +151,24 @@ int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
unsigned long data);
/**
+ * ptrace_parent - return the task that is tracing the given task
+ * @task: task to consider
+ *
+ * Returns %NULL if no one is tracing @task, or the &struct task_struct
+ * pointer to its tracer.
+ *
+ * Must called under rcu_read_lock(). The pointer returned might be kept
+ * live only by RCU. During exec, this may be called with task_lock() held
+ * on @task, still held from when check_unsafe_exec() was called.
+ */
+static inline struct task_struct *ptrace_parent(struct task_struct *task)
+{
+ if (unlikely(task->ptrace))
+ return rcu_dereference(task->parent);
+ return NULL;
+}
+
+/**
* ptrace_event_enabled - test whether a ptrace event is enabled
* @task: ptracee of interest
* @event: %PTRACE_EVENT_* to test