suid bit on an executable is ignored during boot process.

rob_of_ownsboro · 10-07-2005, 10:20 AM

I have an executable /usr/local/bin/process_monitor which is owned by the user engineer.
I have set the SUID bit with chmod u+s. I have a scripts which calls this executable passing the required parameters. Upon bootup my script is called from another in /etc/rc5.d. Process_monitor and other processes it forks are ran as root. If I manualy execute this script from when logged in as root process_monitor is ran as engineer being the owner as expected.

OS: RHEL4

ahedler · 11-21-2005, 11:34 PM

I think you need to do an su in the startup script to run it as the engineer user. You may actually need to run a different script to call the intended script with su.

-Alan

jschiwal · 11-22-2005, 01:42 AM

I don't believe that suid scripts are allow in linux because they are difficult to secure.

Check out lesson 7 in this page:
http://www.samag.com/documents/s=114...106a/0106a.htm

foo_bar_foo · 11-22-2005, 12:34 PM

it might be trying to run the script while the partition is still mounted read only -- i think read only is a non-suid mode.