linux-kernel - Re: [PATCH] FDPIC: Ignore the loader's PT_GNU

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Date:	Sat, 4 Jul 2009 05:34:29 +0200
From:	Pavel Machek <pavel@....cz>
To:	David Howells <dhowells@...hat.com>
Cc:	vapier.adi@...il.com, rgetz@...ckfin.uclinux.org,
	lethal@...ux-sh.org, gerg@...inux.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when
	calculating the stack size

On Wed 2009-07-08 12:01:40, David Howells wrote:
> Pavel Machek <pavel@....cz> wrote:
> 
> > The patch seems wrong to me; loader needs the stack, too, right?
> > 
> > What about making sure that the loader specifies reasonable stack
> > size, instead?
> 
> The loader doesn't need its own stack, unless it _is_ the executable.  It uses
> the executable's stack.  The problem is that the executable and the loader can
> both specify the stack size for NOMMU, but which one do we pick, or do we
> consider both.

Imageine loader needs 64K, while executable only needs 4K. You surely
want to execute it with 64K stack, because it will not fit into 4K?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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