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SubjectRe: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE_ATTACH

On Mon, Feb 14, 2011 at 04:06:56PM +0100, Oleg Nesterov wrote:
> This was (very briefly) discussed recently. Probably we can implement
> PTRACE_DETACH_RUNNING (the name is random) which doesn't require the
> stopped tracee but ignores the "data" argument.

I think the root problem is not how ptrace detaches but how ptrace
attaches and stops tracee. If we have a clean way to seize the
tracee, how we detach doesn't really matter. For example, a new
ptrace call which stops the tracee and puts it in a ptrace command
ready state without messing with the signal and group stop stuff.



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