prelink should not mess with running executables

[Sam Varshavchik]

Richard W.M. Jones writes:

> I suspect there is still a small race window, even if you've got the
> right %post hook.
>
> Does it need to be the same executable?  Isn't it sufficient to check
> that it's the same user (ie. using SO_PEERCRED):
>
> http://www.perlmonks.org/?node_id=952805
>
> Or perhaps something using SCM_RIGHTS/SCM_CREDENTIALS ...

Well, SCM_RIGHTS/SCM_CREDENTIALS is how you get the peer's pid in the first  
place.

This would be an additional check, on top of that.

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