Am 15.10.2013 19:54, schrieb Chris Adams: > Once upon a time, Jan Kratochvil <jan.kratochvil@xxxxxxxxxx> said: >> On Tue, 15 Oct 2013 19:42:25 +0200, Reindl Harald wrote: >>> * look at the amount of updates and how they hit prelinked libraries until >>> prelink ran again >>> * look at the "lsof | grep DEL | grep /usr" output caused by prelink >> >> Sorry I do not see what disadvantage is it? > > If you install updates, reboot, and log in, you are running > non-prelinked binaries/libraries. If you don't log out (just lock > screen or suspend for example), when you next use the system after > prelink has run, new programs will use the prelinked bins/libs. Now you > are wasting a chunk of RAM, as it can't be shared between non-prelinked > and prelinked bins/libs *and* because prelink is the reason *not* build a lot of packages with position independent code because it can't be prelinked and the excuse is that prelink itself does a little randomization in the case you reboot after updates and login you have pretty well *disabled ASLR at all* until re-login after prelink did it's job from security point of view prelink is nothing else than a nightmare and it stands in the way get the whole distribution hardened for what gain? for one where you can't make a distinct between prelink optimization our typical noise on a multi-threaded operating system?
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