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Date: Thu, 4 Oct 2001 11:19:34 -0600
Message-Id: <200110041719.f94HJYQ07125@vindaloo.ras.ucalgary.ca>
From: Richard Gooch <rgooch@ras.ucalgary.ca>
To: Andreas Schwab <schwab@suse.de>
Cc: Richard Gooch <rgooch@ras.ucalgary.ca>, <linux-kernel@vger.kernel.org>
Subject: Re: Security question: "Text file busy" overwriting executables but not shared libraries?
In-Reply-To: <jehetfcr73.fsf@sykes.suse.de>
In-Reply-To: <m1n137zbyo.fsf@frodo.biederman.org>
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Andreas Schwab writes:
> Richard Gooch <rgooch@ras.ucalgary.ca> writes:
> 
> |> Linus Torvalds writes:
> |> > 
> |> > On 4 Oct 2001, Eric W. Biederman wrote:
> |> > >
> |> > > First what user space really wants is the MAP_COPY.  Which is
> |> > > MAP_PRIVATE with the guarantee that they don't see anyone else's changes.
> |> > 
> |> > Which is a completely idiotic idea, and which is only just another
> |> > example of how absolutely and stunningly _stupid_ Hurd is.
> |> 
> |> Indeed. If you're updated a shared library, why not *create a new
> |> file* and then rename it?!? That lets running programmes work fine,
> |> and new programmes will get the new library. Also, the following
> |> construct makes a lot of sense:
> |> 	ld -shared -o libfred.so *.o || mv libfred.so /usr/local/lib
> 
> That || should be &&, otherwise you are doing exactly the opposite
> of what you want.

Yeah. Of course. Brain fart. Fingers faster than brain syndrome...

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca
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