Re: [PATCH v3 1/2] fork: extend clone3() to support CLONE_SET_TID

[Oleg Nesterov]

On 08/06, Adrian Reber wrote:
>
> @@ -2573,6 +2575,14 @@ noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
>  		.tls		= args.tls,
>  	};
>  
> +	if (size == sizeof(struct clone_args)) {
> +		/* Only check permissions if set_tid is actually set. */
> +		if (args.set_tid &&
> +			!ns_capable(pid_ns->user_ns, CAP_SYS_ADMIN))

and I just noticed this uses pid_ns = task_active_pid_ns() ...

is it correct?

I feel I am totally confused, but should we use the same
p->nsproxy->pid_ns_for_children passed to alloc_pid?

Oleg.