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Thu, 20 Aug 2026 23:04:11 -0700 (PDT) Date: Fri, 21 Aug 2026 14:03:33 +0800 From: Vernon Yang To: Andrew Morton Cc: Lance Yang , 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 Message-ID: <006469fe-b6f2-44c9-85ab-b9ef99bfb2f0@gmail.com> References: <20260815174444.4164-1-lance.yang@linux.dev> <20260815181632.21453-1-lance.yang@linux.dev> <20260817153049.120e224cc303f1c2292cd768@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 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