perl script set uid

PMP · 08-11-2009, 05:42 AM

I have a script that start the http deamon. This script has got owner and group as root and I have put a setuid on it.

That scripts executes from normal user fine. Now suddenly this script has stopped functioning.

I want to know:

1. The effective uid get propogated to other script called by this script.

2. Is there any way to stop this propogation, If yes how this can be done.

My distro is RHEL.

bhaslinux · 08-11-2009, 09:51 AM

AFAIK
Setuid is for binary programs. The #! in the scripts just tell the shell what program to use to run this script.
Now since you might have given something like #!/usr/bin/perl, what effectively gets translated is that shell
executes this as

/usr/bin/perl <program name>
so eventhough the program script is setuid, it will not get executed as per the setuid principle.
If this were a compiled self-executable, then the setuid will work.

so the answers are
1. the effect uid is the uid of the user who is running the script
2. ???

PMP · 08-11-2009, 10:23 AM

Well setuid in perl is possible.