Re: [PATCH] user_ns: use correct check for single-threadedness

[Oleg Nesterov]

On 08/05, Eric W. Biederman wrote:
>
> So I have to ask.

I hope you are asking someone else, not me ;) I never understood what
exactly we try to restrict and why.

> Is it possible to rework these checks such that we
> look at the sighand struct and signal sharing handling sharing instead
> of the count on the mm_struct?

Then why we can't simply check thread_group_empty() == T ? Why should we
worry about CLONE_SIGHAND at all?

Oleg.

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