linux-kernel - Re: maps2-add-proc-pid-pagemap-interface.patch

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Message-Id: <1184050835.6005.532.camel@localhost.localdomain>
Date:	Tue, 10 Jul 2007 17:00:35 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: maps2-add-proc-pid-pagemap-interface.patch

On Tue, 2007-07-10 at 01:27 -0500, Matt Mackall wrote:
> On Tue, Jul 10, 2007 at 02:28:50PM +1000, Rusty Russell wrote:
> > I don't think normal ptraces get cut on exec, so I'm not sure why this
> > should be different.
> 
> They absolutely do, if UID changes. Consider ptracing a shell
> launching a setuid binary.

No, ptraced processes don't change uid on execing a setuid binary.
Which works, but isn't what you want 8(

> For something more closely analogous, consider opening /proc/pid/mem
> on the same shell...

Ah, now I see where you got this from.  OK, but can I have a comment
please?

Thanks!
Rusty.

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