From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-93.mta0.migadu.com [91.218.175.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A95B367B96 for ; Sun, 18 Oct 2026 06:22:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.93 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792304564; cv=none; b=oa+F0qqghAFN1ichCh0dNate8xEKrZQ3CwmTZBn45t//QuGSi9JCbIdrWd6MIj+8KAKbmyDAOUswpc4GzOgB4cQ/wN8ANDiVNPU+iEm9ZpceRM4U35C2LvoOGCk1jz+Ewg5+Zo3GETNGUtXky/mQbfg+rnM0UKMcN2FGSRM9c1s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792304564; c=relaxed/simple; bh=L5Dnhm6NG0TC7wQ45/nC5deJSj63hjDiiipgdq6joRs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ElLQbtLISQQkphdBje8mztIlXa8TCdyHxX8JiTUYRrpH8IlpSNlfTycPFPEa4S4v+tuaYM8ab05asZV4QQi5DpKL/zu05Ws5v3RL5u0ExIPMpek+8Yr/7BiF5yJ5/WKRajVjmY6F+nKQNCgpIejtylRSdwM/0ymKapNjhy9f2/I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=OsHCmT4y; arc=none smtp.client-ip=91.218.175.93 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="OsHCmT4y" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=L5Dnhm6NG0TC7wQ45/nC5deJSj63hjDiiipgdq6joRs=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1792304561; v=1; x=1792909361; b=OsHCmT4y/LajFmI0bK7LG2zgbrqRqa+ldNTsDcfgUbYxYYHDLVh5KAERwWpzGFekusOTShiS bgOyjNeY1r9LTv8EbaSHJolXmvehSG/DyoLfdzRZ+92zM1tT5zw+5jIXa1FHjRrFmipVxmdMoo2 ceGX8Fs+qtXYggUpm/R+I9Tg= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 582e136e2d86482f; 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> 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=UTF-8 Content-Transfer-Encoding: 8bit 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