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-rw-r--r--kernel/ptrace.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 4348586..20d5efd 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -112,16 +112,14 @@ int ptrace_check_attach(struct task_struct *child, int kill)
*/
read_lock(&tasklist_lock);
if ((child->ptrace & PT_PTRACED) && child->parent == current) {
- ret = 0;
/*
* child->sighand can't be NULL, release_task()
* does ptrace_unlink() before __exit_signal().
*/
spin_lock_irq(&child->sighand->siglock);
- if (task_is_stopped(child))
- child->state = TASK_TRACED;
- else if (!task_is_traced(child) && !kill)
- ret = -ESRCH;
+ WARN_ON_ONCE(task_is_stopped(child));
+ if (task_is_traced(child) || kill)
+ ret = 0;
spin_unlock_irq(&child->sighand->siglock);
}
read_unlock(&tasklist_lock);
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