linux-kernel - Re: [PATCH] mm: Make copy_huge

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Date:   Wed, 14 Jul 2021 03:20:44 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Mina Almasry <almasrymina@...gle.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Peter Xu <peterx@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Make copy_huge_page() always available

On Tue, Jul 13, 2021 at 07:12:44PM -0700, Andrew Morton wrote:
> On Mon, 12 Jul 2021 16:32:07 +0100 "Matthew Wilcox (Oracle)" <willy@...radead.org> wrote:
> 
> > Rewrite copy_huge_page() and move it into mm/util.c so it's always
> > available.  Fixes an exposure of uninitialised memory on configurations
> > with HUGETLB and UFFD enabled and MIGRATION disabled.
> 
> Wait.  Exposing uninitialized memory is serious.  Can we please include
> full info on this flaw and decide whether a -stable backport is justified? 
> If not, why not, etc?

Well, the code was only merged this merge window, so as long as it goes
in in the next few weeks, there's no need to trouble -stable with it.