what i wan't to do is to limit some of my users
from runing a specific proces, not all of them but just some of them
and i also want that some of my users may run theese proceses
so noexec doesn't come in handy here

the kernel version is 2.4.33.3
distro is Slack 11

If you mean you wish to restrict who runs certain binaries, you can accomplish that by only allowing the owner (which I am guessing will be root) and a particular group to execute that binary -- i.e. turn off execution, and maybe read, for other. Create a special group for this and add the users you wish to allow to run it to that group.

Depending on what you are doing, you may need to make sure that users can't do an end run around this by copying a version (perhaps from an external source) to a directorory they can write to and execute from, and running that. On most systems, you can guard against that by making /tmp and /home noexec. You also would need to make sure they can't execute from removable media (I don't know how to advise you on this last detail).

i've been thinking about this noexec stuff
but im leaving this for my last resort

well the owner is not root
the owner can be the user himself

let's take for example the Shoutcast server
every non-root user can install and run it on my server
but i want to limit some of my users from runing this binary
but i still want to allow some of my users to run this binary

and i'm getting pretty tired of killing all of those not wanted process

I won't say it is impossible, but if everybody has shell access (or some other way to launch a program), I would think it would be incredibly difficult to do what you want. Even if you find some way to keep people from launching something that identifies itself as Shoutcast, somebody could get around it by calling the program something else. It would seem you would require whitelisting using digital signatures or something.

W/o using noexec (and maybe even using it), it sounds like a very difficult problem to me. All I can do is wish you good luck. Maybe somebody else has a really clever idea.