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Return to libc attack

Hi,
Am currently doing Return to libc attack as part of an assignment. I have analysed the code and I have replaced the return address to point to system() with /bin/sh as argument. I have the following pattern in the stack.
4 bytes - return address - address of system()
4 bytes - address of exit()
4 bytes - Address of /bin/sh.

When I execute the code in gdb my program spawns a shell, whereas when I execute without gdb my program goes for a gracefull exit and I dont get a shell prompt. Please help me out with this?

Regards
Sridhar M

I notice that you are new to LQ and would like to suggest that you please review the LQ Rules, here.

Unfortunately, your question is a violation of two of them:

Do not expect LQ members to do your homework - you will learn much more by doing it yourself.
Posts containing information about cracking, piracy, warez, fraud or any topic that could be damaging to either LinuxQuestions.org or any third party will be immediately removed.

And on that note, I'm closing the thread.

msridhar87, LQ isn't the place to get help with attack code.