linux-kernel - Re: [PATCH v3 3/8] mm: implement sticky VMA flags

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <762f2824-6a3b-422a-a8b8-66b6d5d78fda@lucifer.local>
Date: Wed, 19 Nov 2025 13:40:28 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Pedro Falcato <pfalcato@...e.de>
Cc: Mark Brown <broonie@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, David Hildenbrand <david@...hat.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Jann Horn <jannh@...gle.com>, Zi Yan <ziy@...dia.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
        Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
        Lance Yang <lance.yang@...ux.dev>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-trace-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Andrei Vagin <avagin@...il.com>,
        Aishwarya.TCV@....com
Subject: Re: [PATCH v3 3/8] mm: implement sticky VMA flags

On Wed, Nov 19, 2025 at 01:27:08PM +0000, Pedro Falcato wrote:
> On Wed, Nov 19, 2025 at 01:16:36PM +0000, Mark Brown wrote:
> > On Fri, Nov 07, 2025 at 04:11:48PM +0000, Lorenzo Stoakes wrote:
> > > It is useful to be able to designate that certain flags are 'sticky', that
> > > is, if two VMAs are merged one with a flag of this nature and one without,
> > > the merged VMA sets this flag.
> >
> > I'm seeing regressions on multiple arm64 platforms in at least the LTP
> > clone302 and madvise10 selftests, both of which have bisected to one of
> > the fixups to this patch.  Especially given the other tests that also
> > bisected to the same place I've not investigated further.  There's a
> > number of other LTP tests that started failing today including relevant
> > seeming ones munlockall01, mprotect04, madvise10, mprotect03 and
> > futex_cmp_requeue01 but I don't have bisects to confirm they're the same
> > thing.
> >
>
> Thanks for the reports!
>
> > clone302:
> >
> > tst_buffers.c:57: TINFO: Test is using guarded buffers
> > tst_tmpdir.c:316: TINFO: Using /tmp/LTP_clorMwMMw as tmpdir (nfs filesystem)
> > tst_test.c:1953: TINFO: LTP version: 20250530
> > tst_test.c:1956: TINFO: Tested kernel: 6.18.0-rc6-next-20251119 #1 SMP PREEMPT @1763523415 aarch64
>
> next-20251119 still has the v3 version of the patchset, which is Known Bad(tm)
> after a couple of buggy fixups. v4 should hopefully work properly.
>
> --
> Pedro

Thanks for the reports Mark and also for following up Pedro, and yeah this
should now be fully resolved in v4, see [0].

The fixups were just broken but luckily Pedro noticed the mistake I'd made and
so was able to get a fix out quickly! :)

[0]:https://lore.kernel.org/all/cover.1763460113.git.lorenzo.stoakes@oracle.com/

Cheers, Lorenzo