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To: Richard Gooch <rgooch@ras.ucalgary.ca>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: Security question: "Text file busy" overwriting executables but not shared libraries?
In-Reply-To: <m1n137zbyo.fsf@frodo.biederman.org>
	<Pine.LNX.4.33.0110040842320.8350-100000@penguin.transmeta.com>
	<200110041602.f94G20k06280@vindaloo.ras.ucalgary.ca>
X-Yow: I am having FUN...  I wonder if it's NET FUN or GROSS FUN?
From: Andreas Schwab <schwab@suse.de>
Date: 04 Oct 2001 18:20:32 +0200
In-Reply-To: <200110041602.f94G20k06280@vindaloo.ras.ucalgary.ca> (Richard Gooch's message of "Thu, 4 Oct 2001 10:02:00 -0600")
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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.

Andreas.

-- 
Andreas Schwab                                  "And now for something
Andreas.Schwab@suse.de				completely different."
SuSE Labs, SuSE GmbH, Schanz?ckerstr. 10, D-90443 N?rnberg
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