Re: [PATCH 2/2] ptrace: Return the signal to continue with from ptrace_stop

[Oleg Nesterov]

Not sure I understand this patch, I can't apply it. I guess I need to
clone your tree first, will do later.

Just one question right now,

On 03/15, Eric W. Biederman wrote:
>
> +static int ptrace_stop(int exit_code, int why, int clear_code,
>  			unsigned long message, kernel_siginfo_t *info)
>  	__releases(&current->sighand->siglock)
>  	__acquires(&current->sighand->siglock)
>  {
>  	bool gstop_done = false;
> +	bool read_code = true;
>  
>  	if (arch_ptrace_stop_needed()) {
>  		/*
> @@ -2305,8 +2307,9 @@ static void ptrace_stop(int exit_code, int why, int clear_code,
>  
>  		/* tasklist protects us from ptrace_freeze_traced() */
>  		__set_current_state(TASK_RUNNING);
> +		read_code = false;
>  		if (clear_code)
> -			current->exit_code = 0;
> +			exit_code = 0;
>  		read_unlock(&tasklist_lock);
>  	}
>  
> @@ -2316,8 +2319,10 @@ static void ptrace_stop(int exit_code, int why, int clear_code,
>  	 * any signal-sending on another CPU that wants to examine it.
>  	 */
>  	spin_lock_irq(&current->sighand->siglock);
> +	if (read_code) exit_code = current->exit_code;

style ;)

>  	current->last_siginfo = NULL;
>  	current->ptrace_message = 0;
> +	current->exit_code = 0;

OK, I like it... but can't we remove the ugly "int clear_code" arg?

Oleg.