Re: [RFC 2/3] futex: exit: Print a warning when futex_cleanup fails

[Matthew Wilcox]

On Thu, Apr 21, 2022 at 03:05:32PM -0400, Nico Pache wrote:
> @@ -1007,13 +1013,15 @@ static inline void exit_pi_state_list(struct task_struct *curr) { }
>  static void futex_cleanup(struct task_struct *tsk)
>  {
>  	if (unlikely(tsk->robust_list)) {
> -		exit_robust_list(tsk);
> +		if (!exit_robust_list(tsk))
> +			pr_info("futex: exit_robust_list failed");

Doesn't this allow a malicious user process to spam the kernel logs
with messages?  There needs to be a ratelimit on this, at least.