Re: [PATCH 14/16] ptrace: make SIGCONT notification reliableagainst ptrace

[Oleg Nesterov]

On 12/06, Tejun Heo wrote:
>
> This patch adds a new signal flag SIGNAL_NOTIFY_CONT which is set when
> a task is woken up by SIGCONT and cleared once the event is notified
> to the parent.  SIGNAL_CLD_MASK bits are no longer cleared after
> notification.  Combined with clearing SIGNAL_CLD_MASK if
> !SIGNAL_NOTIFY_CONT on ptrace attach, these bits are set on ptrace
> detach iff the tracee owes a notification to the real parent.
> __ptrace_unlink() is updated to check these bits and reschedule
> SIGCONT notification if necessary.

It turns out I can no longer read the patches today ;)  Will continue
tomorrow with the fresh head.

I must admit, I have some concerns. But most probably I just need
to actually understand what this patch does.

Oleg.

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