From: Andrea Arcangeli <aarcange@redhat.com>
To: Michel Lespinasse <walken@google.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org
Subject: Re: [PATCH] mm: fix potential anon_vma locking issue in mprotect()
Date: Wed, 5 Sep 2012 01:45:55 +0200 [thread overview]
Message-ID: <20120904234555.GO3334@redhat.com> (raw)
In-Reply-To: <1346801989-18274-1-git-send-email-walken@google.com>
On Tue, Sep 04, 2012 at 04:39:49PM -0700, Michel Lespinasse wrote:
> This change fixes an anon_vma locking issue in the following situation:
> - vma has no anon_vma
> - next has an anon_vma
> - vma is being shrunk / next is being expanded, due to an mprotect call
>
> We need to take next's anon_vma lock to avoid races with rmap users
> (such as page migration) while next is being expanded.
>
> Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
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next prev parent reply other threads:[~2012-09-04 23:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 23:39 [PATCH] mm: fix potential anon_vma locking issue in mprotect() Michel Lespinasse
2012-09-04 23:45 ` Andrea Arcangeli [this message]
2012-09-04 23:46 ` Andrew Morton
2012-09-05 0:02 ` Michel Lespinasse
2012-09-05 10:11 ` Andrea Arcangeli
2012-09-05 19:24 ` Hugh Dickins
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