Re: Security question: "Text file busy" overwriting executables but not shared libraries?

[Andreas Schwab <schwab@suse.de>]

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, Schanzäckerstr. 10, D-90443 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5