Running programs under root with suid bit

Hello,

i've got a minimal test case with a C program with the following code

Code:

---

#include <stdio.h>

int main(){
printf("uid = %d", getuid());
printf("euid = %d", geteuid());
}

---

After compiling the program and running it i get my own user id (1000), so thats fine.

Then i want to run it under root.

I do chown root.root <program name> and chmod 4771 <program name>

after running it again it still shows me 1000 as it's uid.

Trying stuff like loading modules also does not work, so it really does not have root.

Am i missing something here?

Any help would be greatly appreciated.

Ps.

I'm running debian lenny, executing the exact same commands on the ping executable does give me the correct results...

Well, you have remove read permission from "others" (including yourself) which is one thing, and you haven't properly set the setuid bit(s).

First, set the proper permissions: chmod 755 cmdname
Then, set the setuid bit(s): chmod +s cmdname

Try that and see what happens.

Hello,

Thank you for your reply,

Sorry i have not been able to reply earlier, i've found the solution the partition was mounted with the nosuid flag, which makes using the suid bit kind of hard ;)

Richard