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-rw-r--r--kernel/kthread.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 16d8ddd..760e86d 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -17,6 +17,7 @@
#include <linux/slab.h>
#include <linux/freezer.h>
#include <linux/ptrace.h>
+#include <linux/uaccess.h>
#include <trace/events/sched.h>
static DEFINE_SPINLOCK(kthread_create_lock);
@@ -135,6 +136,24 @@ void *kthread_data(struct task_struct *task)
return to_kthread(task)->data;
}
+/**
+ * probe_kthread_data - speculative version of kthread_data()
+ * @task: possible kthread task in question
+ *
+ * @task could be a kthread task. Return the data value specified when it
+ * was created if accessible. If @task isn't a kthread task or its data is
+ * inaccessible for any reason, %NULL is returned. This function requires
+ * that @task itself is safe to dereference.
+ */
+void *probe_kthread_data(struct task_struct *task)
+{
+ struct kthread *kthread = to_kthread(task);
+ void *data = NULL;
+
+ probe_kernel_read(&data, &kthread->data, sizeof(data));
+ return data;
+}
+
static void __kthread_parkme(struct kthread *self)
{
__set_current_state(TASK_PARKED);
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