linux-kernel - Re: [PATCH] mm hugetlb x86: fix hugepage memory leak in mincore()

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Message-Id: <20091208143506.250b47c7.akpm@linux-foundation.org>
Date:	Tue, 8 Dec 2009 14:35:06 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	n-horiguchi@...jp.nec.com
Cc:	LKML <linux-kernel@...r.kernel.org>, hugh.dickins@...cali.co.uk,
	linux-mm <linux-mm@...ck.org>, stable@...nel.org
Subject: Re: [PATCH] mm hugetlb x86: fix hugepage memory leak in mincore()

On Mon, 07 Dec 2009 16:59:14 +0900
Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> Most callers of pmd_none_or_clear_bad() check whether the target
> page is in a hugepage or not, but mincore() and walk_page_range()
> do not check it. So if we use mincore() on a hugepage on x86 machine,
> the hugepage memory is leaked as shown below.
> This patch fixes it by extending mincore() system call to support hugepages.

This bug is fairly embarrassing.  I tagged the patch for a -stable
backport.

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