linux-kernel - Re: [PATCH] Don't allow the stack to grow into hugetlb reserved regions

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Message-Id: <20070126120554.671b1d6a.akpm@osdl.org>
Date:	Fri, 26 Jan 2007 12:05:54 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Adam Litke <agl@...ibm.com>
Cc:	linux-mm@...ck.org, david@...son.dropbear.id.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Don't allow the stack to grow into hugetlb reserved
 regions

On Thu, 25 Jan 2007 13:40:52 -0800
Adam Litke <agl@...ibm.com> wrote:

> When expanding the stack, we don't currently check if the VMA will cross into
> an area of the address space that is reserved for hugetlb pages.  Subsequent
> faults on the expanded portion of such a VMA will confuse the low-level MMU
> code, resulting in an OOPS.  Check for this.

We prefer not to oops.  Is there any reason why this isn't a serious fix, needed
in 2.6.20 and 2.6.19?
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