linux-kernel - Re: [PATCH 5.10 569/593] hugetlb: address ref count racing in prep_compound_gigantic

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Message-ID: <150cd16f-a99b-9573-da41-2f50533ac792@oracle.com>
Date:   Tue, 13 Jul 2021 14:38:51 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Jann Horn <jannh@...gle.com>,
        Youquan Song <youquan.song@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jan Kara <jack@...e.cz>, John Hubbard <jhubbard@...dia.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 569/593] hugetlb: address ref count racing in
 prep_compound_gigantic_page

On 7/11/21 11:12 PM, Greg Kroah-Hartman wrote:
> From: Mike Kravetz <mike.kravetz@...cle.com>
> 
> [ Upstream commit 7118fc2906e2925d7edb5ed9c8a57f2a5f23b849 ]
> 
Please do not add or the requisite patch to stable tree.

Although this is a real potential issue, it was only found during code
inspection.  It has existed for more than 10 years and I am unaware of
anyone hitting this in actual use.  In addition, this proposed fix will
likely be updated/simplified based on more discussions.
--
Mike Kravetz