Re: [PATCH] seccomp: add ptrace commands for suspend/resume

[Oleg Nesterov]

On 06/02, Tycho Andersen wrote:
>
> > Do we need to re-enable seccomp if a tracer detaches unexpectedly.
> > CRIU can be killed and we should try to not affect the task state even
> > in this case.
>
> Yes, I think Pavel's suggestion on the CRIU list of simply
> automatically re-enabling seccomp on ptrace detach

But note that you can't enable tsc if the tracer dies, in this case
the tracee can be running.

Otherwise, if we use PTRACE_O_ instead, it goes away automatically if
the tracer dies or does PTRACE_DETACH.

Oleg.

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