linux-kernel - Re: [PATCH] mm: Fix possible PMD dirty bit lost in set_pmd_migration

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Date:   Thu, 20 Feb 2020 16:13:25 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH] mm: Fix possible PMD dirty bit lost in
 set_pmd_migration_entry()

On Thu, Feb 20, 2020 at 03:52:20PM +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@...el.com>
> 
> In set_pmd_migration_entry(), pmdp_invalidate() is used to change PMD
> atomically.  But the PMD is read before that with an ordinary memory
> reading.  If the THP (transparent huge page) is written between the
> PMD reading and pmdp_invalidate(), the PMD dirty bit may be lost, and
> cause data corruption.  The race window is quite small, but still
> possible in theory, so need to be fixed.
> 
> The race is fixed via using the return value of pmdp_invalidate() to
> get the original content of PMD, which is a read/modify/write atomic
> operation.  So no THP writing can occur in between.
> 
> The race has been introduced when the THP migration support is added
> in the commit 616b8371539a ("mm: thp: enable thp migration in generic
> path").  But this fix depends on the commit d52605d7cb30 ("mm: do not
> lose dirty and accessed bits in pmdp_invalidate()").  So it's easy to
> be backported after v4.16.  But the race window is really small, so it
> may be fine not to backport the fix at all.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Cc: Zi Yan <ziy@...dia.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vlastimil Babka <vbabka@...e.cz>

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

-- 
 Kirill A. Shutemov