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Date:	Mon, 5 Jan 2015 13:11:20 -0800
From:	Linus Torvalds <>
To:	Jay Foad <>
Cc:	Linux Kernel Mailing List <>,
	Andrew Morton <>,
	Alan Cox <>
Subject: Re: [2/3] mm: fix up some user-visible effects of the stack guard page

On Mon, Jan 5, 2015 at 1:03 PM, Linus Torvalds
<> wrote:
> Yup, your analysis sounds correct.  My completely untested gut feel is
> that the problem is that we don't actually return the error from the
> expand_stack() call, so then do_anonymous_page() will allow the extra
> guard-page access.
> IOW, *maybe* a patch like this. TOTALLY UNTESTED! I may have missed
> something, and this may be complete crap.

.. and ti's still untested, but I'm pretty sure it's right - except we
should probably also allow an extra page for the stack rlimit (so that
the guard page doesn't count towards the limit).

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