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Sun, 18 Oct 2026 06:22:41 +0000 X-Mizu-Trace-ID: 582e136e2d86482f X-Migadu-Flow: FLOW_OUT From: Lance Yang To: david@kernel.org Cc: akpm@linux-foundation.org, liam@infradead.org, ljs@kernel.org, vbabka@kernel.org, jannh@google.com, pfalcato@suse.de, muchun.song@linux.dev, osalvador@suse.de, linmiaohe@huawei.com, nao.horiguchi@gmail.com, agl@us.ibm.com, mel@csn.ul.ie, riel@surriel.com, peterx@redhat.com, kas@kernel.org, rppt@kernel.org, josef@toxicpanda.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH 03/10] mm/hugetlb: fix use-after-free in hugetlb_mfill_atomic_pte() Date: Sun, 18 Oct 2026 14:22:35 +0800 Message-ID: <20261018062235.15630-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261015-urgent_fixes-v1-3-42796911043b@kernel.org> References: <20261015-urgent_fixes-v1-3-42796911043b@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspam-User: X-Rspamd-Queue-Id: 9E64040007 X-Stat-Signature: tm7sygq177cjfgmewk4jrx8rfaqnrp63 X-HE-Tag: 1792304563-177565 X-HE-Meta: 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 E8x74YZR MYdhiHKeDBqebw/UNGvDg9+ut1+6Y/znbRDcefWgUmkh5y/0Dp0nAWBauKHqjF/BecEhgU6DT3+8zOf+WpiDzW0zmYIFlAYJf3f7ImS1cSm2W8g9etT3Eh2xJMMQsIY69v1nnvbfaCFA15UtJDp9gcPTTwbkAvmQK53CxbUICL1WEyeqK/l6Wt8GYfmstB4tVvzQW5MpQJm1yQG9QQ2rsLRaS5K2heFXAWZaHNa5/Euj3zvSIngDSYpF4lOv6ZwbEPwkPrM17tXX91hm+fDnHiWEYRnM0I7Db/MpVQE+wHW6syScFS1c3rOIaK79UQt+HnYYyxhA+usqEjTsDXs7wRyH5SYHUkiBH+AXQs1mvk1wghypl/R21ydthMua6qFfMUHMz Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Oct 15, 2026 at 06:07:09PM +0200, David Hildenbrand (Arm) wrote: >Let's fix another instance where we use a folio after dropping the PTL, >where someone else could e.g., MADV_DONTNEED it once we drop the PTL, >making us trigger a use-after-free on the folio. > >Fixes: cb6acd01e2e4 ("hugetlbfs: fix races and page leaks during migration") >Fixes: 1c9e8def43a3 ("userfaultfd: hugetlbfs: add UFFDIO_COPY support for shared mappings") >Cc: stable@vger.kernel.org >Reported-by: Lorenzo Stoakes (ARM) >Reviewed-by: Lorenzo Stoakes (ARM) >Signed-off-by: David Hildenbrand (Arm) >--- Nice work! Reviewed-by: Lance Yang