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Re: prelinking speed

On Fri, Oct 04, 2002 at 04:02:00PM +0200, Andreas Jaeger wrote:
> Speaking about prelinking: Prelinking changes the binaries themselves
> and therefore the md5sum is not the same anymore.  This might be a
> problem for RPM (since you can verify that a program is still the
> original using the md5sum) and also for security programs that create
> a database of security related programs.   

rpm -V works just fine and other security programs can do the same
what rpm does.
That's what prelink --verify mode is for.
It does prelink --undo operation followed by prelink operation and compares
whether the current binary/library and this undone (supposedly original)
and then re-prelinked file is identical. If yes, it exits with exit status 0
after outputing the undone image on its standard output.
So, if prelink --verify exits with zero exit status, then md5sum
of its output is identical to md5sum stored in some database, then the file
was modified by prelink only and nothing else.


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