From: Vernon Yang <vernon2gm@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Lance Yang <lance.yang@linux.dev>,
baolin.wang@linux.alibaba.com, david@kernel.org, ljs@kernel.org,
nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com,
baohua@kernel.org, usama.arif@linux.dev, zokeefe@google.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v2 0/3] mm: khugepaged: fix tracepoint UAF
Date: Fri, 21 Aug 2026 14:03:33 +0800 [thread overview]
Message-ID: <006469fe-b6f2-44c9-85ab-b9ef99bfb2f0@gmail.com> (raw)
In-Reply-To: <20260817153049.120e224cc303f1c2292cd768@linux-foundation.org>
On Mon, Aug 17, 2026 at 03:30:49PM -0700, Andrew Morton wrote:
> On Sun, 16 Aug 2026 02:16:32 +0800 Lance Yang <lance.yang@linux.dev> wrote:
>
> > >>Pass the pfn to the tracepoints directly, captured while the folio is
> > >>still pinned, closing the use-after-free windows in
> > >>mm_khugepaged_scan_file(), mm_khugepaged_scan_pmd() and
> > >>mm_khugepaged_collapse_file().
> > >
> > >Well spotted!
> > >
> > >Gave the series a run on x86_64 (KVM), all good (only classic SPARSEMEM
> > >untested) :)
> >
> > Hmm ... stumbled over something else while testing this ...
>
> Sashiko might have found a couple of pre-existing things.
> https://sashiko.dev/#/patchset/20260815051924.194810-1-vernon2gm@gmail.com
>
> Vernon, you may decide that the second one is on-topic for this patchset?
Hi, Andrew, the second one already is on-topic for this patchset, detail
look for the PATCH#3 please.
--
Cheers,
Vernon
prev parent reply other threads:[~2026-08-21 6:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-15 5:19 [PATCH v2 0/3] mm: khugepaged: fix tracepoint UAF Vernon Yang
2026-08-15 5:19 ` [PATCH v2 1/3] mm: khugepaged: fix swap entry value to folio_pfn() Vernon Yang
2026-08-17 16:10 ` Lorenzo Stoakes (ARM)
2026-08-17 16:19 ` David Hildenbrand (Arm)
2026-08-17 16:24 ` Lorenzo Stoakes (ARM)
2026-08-17 16:23 ` Lorenzo Stoakes (ARM)
2026-08-21 8:17 ` Vernon Yang
2026-08-15 5:19 ` [PATCH v2 2/3] mm: khugepaged: fix folio is used after pte_unmap_unlock() Vernon Yang
2026-08-17 16:11 ` Lorenzo Stoakes (ARM)
2026-08-17 16:20 ` David Hildenbrand (Arm)
2026-08-17 16:29 ` Lorenzo Stoakes (ARM)
2026-08-17 16:33 ` Lorenzo Stoakes
2026-08-21 8:19 ` Vernon Yang
2026-08-15 5:19 ` [PATCH v2 3/3] mm: khugepaged: fix folio is used after folio_put/unlock() Vernon Yang
2026-08-15 17:44 ` [PATCH v2 0/3] mm: khugepaged: fix tracepoint UAF Lance Yang
2026-08-15 18:16 ` Lance Yang
2026-08-17 2:25 ` Baolin Wang
2026-08-17 2:53 ` Lance Yang
2026-08-17 7:24 ` Baolin Wang
2026-08-17 22:30 ` Andrew Morton
2026-08-21 6:03 ` Vernon Yang [this message]
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