On 08/21, Oleg Nesterov wrote:
>
> Still. Can't we make a single check? Like the initial patch I sent, but
> this one moves the check into copy_process() and checks CLONE_* first.
> Looks a bit simpler. And more understandable to me but this is subjective.
Seriously. CLONE_NEWPID and task_active_pid_ns() != nsproxy->pid_ns are
the same thing in this respect. Let me send the patches for review, I
decided to split this change.
> --- x/kernel/fork.c
> +++ x/kernel/fork.c
> @@ -1173,12 +1173,13 @@ static struct task_struct *copy_process(
> return ERR_PTR(-EINVAL);
>
> /*
> - * If the new process will be in a different pid namespace
> - * don't allow the creation of threads.
> + * -------------- COMMENT -----------------
> */
> - if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) &&
> - (task_active_pid_ns(current) != current->nsproxy->pid_ns))
> - return ERR_PTR(-EINVAL);
> + if (clone_flags & (CLONE_SIGHAND | CLONE_PARENT)) {
> + if ((clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) ||
> + (task_active_pid_ns(current) != current->nsproxy->pid_ns))
> + return -EINVAL;
^^^^^^
should be ERR_PTR(-EINVAL)
Oleg.
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