linux-kernel - Re: [RFC] mlock/stack guard interaction fixup

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Date:	Sat, 21 Aug 2010 18:08:39 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	Ian Campbell <ijc@...lion.org.uk>, linux-kernel@...r.kernel.org,
	stable@...nel.org, stable-review@...nel.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Greg KH <gregkh@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [RFC] mlock/stack guard interaction fixup

> 
> > Out of interest, why is there no guard page for the VM_GROWSUP stack
> > case? Is it just that the memory layout on PA-RISC makes the stack grows
> > into the heap scenario impossible?
> 
> No, it's just that I can't find it in myself to care about PA-RISC, so
> I never wrote the code. I don't think anything else has a grows-up
> stack. And even if I were to write the code, I couldn't even test it.
> 
> It should be reasonably easy to do the VM_GROWSUP case too, but
> somebody with a PA-RISC would need to do it.

Tony Luck already provided a VM_GROWSUP version.

    See: http://lkml.org/lkml/2010/8/20/325

[It is signed off by Tony Luc - but I guess they know each other ;-) ]

	Sam
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