linux-kernel - Re: how to determine if the noexec stack is defined by an application

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Message-Id: <1183156068.2894.4.camel@laptopd505.fenrus.org>
Date:	Fri, 29 Jun 2007 15:27:47 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andreas Schwab <schwab@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: how to determine if the noexec stack is defined by an
	application

On Sat, 2007-06-30 at 00:15 +0200, Andreas Schwab wrote:
> Arjan van de Ven <arjan@...radead.org> writes:
> 
> > 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.
> 
> The last part is not true.  Some architectures (especially newer ones)
> default to non-exec stack.  The absense of a GNU_STACK header represents
> the default.

ok you're right; powerpc64 defaults to non-executable stack
(all others default to executable stack)

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
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