topic non executable stack setting in HP-UX 11.00 in Operating System - HP-UX

non executable stack setting in HP-UX 11.00

Irfan Ahmed_1 — Sun, 10 Oct 2004 09:52:15 GMT

Hi all,
I have to do non exectuble stack setting in HP-UX 11.00. But the tunable system parameter - executable_stack is not present in my kernel parameter list ( kmtune -l ). I want to know how can I do this.
-Is there any patch using which I can do this..

Irfan

Re: non executable stack setting in HP-UX 11.00

Sridhar Bhaskarla — Sun, 10 Oct 2004 12:34:24 GMT

Hi Ifran,

This parameter has been introduced only from 11i onwards. For 11.0 you would need to use 'chatr' command to disable executable_stack using '+es' flag. Unfortunately, this has to be done to every program that you suspect.

-Sri

Re: non executable stack setting in HP-UX 11.00

doug hosking — Mon, 11 Oct 2004 04:12:03 GMT

Unfortunately the chatr approach will not work in 11.00. Regardless of what the output of any patched 11.00 versions of chatr may imply, the corresponding kernel logic to enforce any 'chatr +es' settings was never backported to 11.00, and at this stage of the 11.00 support life is highly unlikely to ever be. I'm sorry, but you must be running 11.11 or later to use the non-executable stack features of HP-UX.

Re: non executable stack setting in HP-UX 11.00

Irfan Ahmed_1 — Mon, 11 Oct 2004 04:25:50 GMT

Hi Hosking,

When I went through man pages for chatr the following is given,
"+es flag
Control the ability of user code to execute from stack with the flag values, enable and disable."
Please reply

Re: non executable stack setting in HP-UX 11.00

Dietmar Konermann — Mon, 11 Oct 2004 06:38:33 GMT

It's just like Doug wrote above... the 11.00 kernel lacks the executable stack feature.

Best regards...
Dietmar.

Re: non executable stack setting in HP-UX 11.00

Irfan Ahmed_1 — Tue, 02 Nov 2004 09:07:07 GMT

Hi all,
Non-executable stack setting may not be possible in HP-UX 11.00