Is pre-linking worth it?

Agreed: prelink is problematic iff you have hostile local users, but if
you avoid prelinking privileged programs, libc will be mapped elsewhere
for those programs.

(Sorry about the bounces: my ISP, Zetnet, has gone insane, changing my
static IP but failing to tell me the new IP address ahead of time, failing
to update my DNS zone even when specifically requested, so all its RRs
still point to the old address, messing up the MX relay so that all
incoming email, even to their own DNS administrator, gets bounced rather
than queued, and failing to give me a MAC code (horrid UK-specific
broadband techspeak) as they are legally obliged to, so I can't even
switch to a new ISP. It's absolutely crazy, and I can do nothing
whatsoever about it. God knows what email I've lost.

To make this Linux-relevant, let this be a lesson to everyone in the
dangers of making Debian developers redundant, especially when they know
the network from top to bottom and you're just about to carry out major
changes to that network. In fact it's better never to make Debian
developers redundant at all. Actually it's best if you just give them lots
of money without their even needing to ask. Really.)