full-disclosure - Re: Exploiting buffer overflows via protected GCC

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Date: Mon, 16 Feb 2009 15:06:21 +0100
From: Marcus Meissner <meissner@...e.de>
To: ArcSighter Elite <arcsighter@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Exploiting buffer overflows via protected GCC

On Mon, Feb 16, 2009 at 09:00:33AM -0500, ArcSighter Elite wrote:
> James Matthews wrote:
> > I would recommend doing the following things.
> > 
> > 1. Ask on the Ubuntu GCC list what protection is implemented. (Or just look
> > at the source)
> > 2. Use GCC to see where the execution is being redirected and so you can
> > have a better visual of whats going on.
> > 3. Are you sure the stack is executable?

_fortify_fail is caused by the light weight buffer overflow checking,
enabled by the -D_FORTIFY_SOURCE=2 compile time flag.

Ciao, Marcus

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