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From:   Yang Shi <shy828301@gmail.com>
Date:   Tue, 18 Apr 2023 14:17:24 -0700
Message-ID: <CAHbLzko3Ho-K8Ur-C1iXdPqBFX2i2SKRMm3QOARUfVovPACXGQ@mail.gmail.com>
Subject: Re: [v4 PATCH] fs/proc: task_mmu.c: don't read mapcount for migration entry
To:     David Rientjes <rientjes@google.com>
Cc:     willemb@google.com, David Hildenbrand <david@redhat.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        kirill.shutemov@linux.intel.com, jannh@google.com,
        Matthew Wilcox <willy@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
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On Thu, Apr 13, 2023 at 4:58=E2=80=AFPM David Rientjes <rientjes@google.com=
> wrote:
>
> On Mon, 3 Apr 2023, Yang Shi wrote:
>
> > On Mon, Apr 3, 2023 at 12:30=E2=80=AFAM David Hildenbrand <david@redhat=
.com> wrote:
> > >
> > > On 24.03.23 21:12, Yang Shi wrote:
> > > > On Fri, Mar 24, 2023 at 4:25=E2=80=AFAM Vlastimil Babka <vbabka@sus=
e.cz> wrote:
> > > >>
> > > >> On 3/23/23 21:45, Yang Shi wrote:
> > > >>> On Thu, Mar 23, 2023 at 3:11=E2=80=AFAM Vlastimil Babka <vbabka@s=
use.cz> wrote:
> > > >>>
> > > >>> Out of curiosity, is there any public link for this CVE? Google s=
earch
> > > >>> can't find it.
> > > >>
> > > >> Only this one is live so far, AFAIK
> > > >>
> > > >> https://bugzilla.redhat.com/show_bug.cgi?id=3D2180936
> > > >
> > > > Thank you.
> > >
> > > There is now
> > >
> > > https://access.redhat.com/security/cve/cve-2023-1582
> >
> > Thank you.
> >
>
> Hi Yang,
>
> commit 24d7275ce2791829953ed4e72f68277ceb2571c6
> Author: Yang Shi <shy828301@gmail.com>
> Date:   Fri Feb 11 16:32:26 2022 -0800
>
>     fs/proc: task_mmu.c: don't read mapcount for migration entry
>
> is backported to 5.10 stable but not to 5.4 or earlier stable trees.  The
> commit advertises to fix a commit from 4.5.
>
> Do we need stable backports for earlier trees or are they not affected?

IIRC, it is needed. But I can't remember why it wasn't. Maybe just
because the patch failed to apply to those trees and needs to backport
the patch manually.

>
> Thanks!