Subject: Re: how to determine if the noexec stack is defined by an
	application
From: Arjan van de Ven <arjan@infradead.org>
To: linux-kernel@vger.kernel.org
In-Reply-To: <46856F24.5060407@andrei.myip.org>
References: <46856F24.5060407@andrei.myip.org>
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Organization: Intel International BV
Date: Fri, 29 Jun 2007 14:49:18 -0700
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> But it's running a Web service which is a combination of C code and 
> Tomcat/Java. I have no clue how to determine which portions specify a 
> noexec stack and which don't.
> 
> In case it turns out some portions do not specify a noexec stack, my 
> next question is how to get the application to create a noexec stack 
> (assume I can make that request to the developers).


like this:

$ eu-readelf -l /bin/true  | grep STACK
  GNU_STACK      0x000000 0x00000000 0x00000000 0x000000 0x000000 RW 0x4


(replace /bin/true with the binary or library you want to check)

if it says "RW" like here, it'll have non-executable stack. If it says
"RWX" or if this line is absent entirely, the stack will be executable.


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