Kees Cook wrote:
> Instead of locking the list during a delete, mark entries as invalid
> and trigger a workqueue to clean them up. This lets us easily handle
> task_free from interrupt context.
> @@ -57,9 +80,12 @@ static int yama_ptracer_add(struct task_struct *tracer,
>
> added->tracee = tracee;
> added->tracer = tracer;
> + added->invalid = false;
>
> - spin_lock_bh(&ptracer_relations_lock);
> + spin_lock(&ptracer_relations_lock);
Can't you use
spin_lock_irqsave(&ptracer_relations_lock, flags);
spin_unlock_irqrestore(&ptracer_relations_lock, flags);
instead of adding ->invalid ?
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