linux-kernel - Re: [PATCH 1/9] mm: khugepaged: close use-after-free race during shmem collapsing

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Message-ID: <20161117231945.GA8358@node>
Date:   Fri, 18 Nov 2016 02:19:45 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH 1/9] mm: khugepaged: close use-after-free race during
 shmem collapsing

On Thu, Nov 17, 2016 at 02:11:30PM -0500, Johannes Weiner wrote:
> When a radix tree iteration drops the tree lock, another thread might
> swoop in and free the node holding the current slot. The iteration
> needs to do another tree lookup from the current index to continue.
> 
> [kirill.shutemov@...ux.intel.com: re-lookup for replacement]
> Fixes: f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages")
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov