linux-kernel - Re: [PATCH 03/10] ptrace: implement PTRACE

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Date:	Tue, 24 May 2011 10:49:58 +0100
From:	Pedro Alves <pedro@...esourcery.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>, oleg@...hat.com,
	jan.kratochvil@...hat.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	indan@....nu, bdonlan@...il.com
Subject: Re: [PATCH 03/10] ptrace: implement PTRACE_SEIZE

On Friday 20 May 2011 10:31:11, Tejun Heo wrote:
> On Fri, May 20, 2011 at 10:27:35AM +0100, Pedro Alves wrote:
> > Okay, good to hear that.  Looks like the tracer can do:
> > 
> >  SEIZE,execve,SETOPTS,'readlink /proc/pid/exe'
> > 
> > and pretend it SEIZED after the execve.
> 
> Yeap, and I was trying to say that if tracer and tracee are running on
> different CPUs, the order between SEIZE and execve isn't even well
> defined (sans the nasty automatic SIGTRAP).

I see, indeed, thanks.

A couple interface questions that just crossed my mind:

 - on a fork/vfork/clone, if PTRACE_EVENT_FORK|VFORK|CLONE have been
   enabled, will the tracer still see the new child stop with a
   SIGSTOP, or will it see a PTRACE_EVENT_INTERRUPT?

 - is PTRACE_INTERRUPT on PTRACE_TRACEME-traced-child planed to
   be allowed (for convenience)?
   A PTRACE_O_TRACEINTERRUPT, or some such PTRACE_SETOPTIONS
   option might be necessary to get PTRACE_EVENT_INTERRUPT instead
   of SIGSTOP in the point above.

-- 
Pedro Alves
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