From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794311506; b=Cq+H0ulRn+HGovFZ8sXxgF6xSeS2lI6YzRRl3MCVZnocLrBkNKCola1DJ7pdZguQD3MX O0t4ZqREQ/A3hINZypQvMfqHN684bjFlgWbM2QiFETGEvJ1Riquz3pxN2eQrAzy7bZMgz ce7UTZeCKhlNnshFkZYXt/g8IocWt82rfBCDU6Cm4ZJCRnEcd1YMijv3LLj/EFmR4Xk1y vhlBretzCPSH8y8CPeDSdrNNdRBdWnvhPYPOqH6YTojuP4ic0QTGKztwhGYxpMMPZ+UEF +P0s4X7y2IQMFrO5+Hd4jBphK1eO3xWRiOJZo6HUSILu1nxtpgs1nVUeip7y+ev0Ghg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794311506; h=Received:DKIM-Signature:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:From:Content-Language:Autocrypt:In-Reply-To: Content-Type:Content-Transfer-Encoding; bh=O6X3Z9fBtxilcMGd2LjGjP2OdK0/6YVs2YfALZnX1Y4=; b=gQjSS7QwfNW09KrAQcuHeS4I2Go5W7Dfx0p/dtnyuJ1YDpz9GXkGZR8OcMrLDaFkkIrt c5BlngDHiMmu0xar9B4VDQ/xvdjJMRw9LOERIUJPM/BnfKVH85qpRqK6r9+yz0I6+ogfa f/QJCwpHk334TgdAr+zgsmr83/HWihzuZqN0mHLZU6DpDU/8gvuN4Yx6OGHW5iNd0+XXj 1/OkZ4XD/g0jDZRZCHGw7w7/Xd3te5e296Ifm4jDOR8wkjynTI7zLiuXe6XZPY4ZWYHWo PjrCO7ThCpAryF3mffZa5hLT0QAZnUdttBctIjzgbHOfpjDEUxIfAA5P0dYRaHnkL9Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=oae+OodQ; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 82002606A9BE for ; Tue, 10 Nov 2026 11:51:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=oae+OodQ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9AF371F0089F; Tue, 10 Nov 2026 11:51:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794311506; bh=O6X3Z9fBtxilcMGd2LjGjP2OdK0/6YVs2YfALZnX1Y4=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=oae+OodQ78mRo/uzxIlp3uK3oFdwp52ecWXJSOmm/c62ef4MUimKFBNXtSOohv7gJ 7cQBQu13y+Ijgpl4UpJX4dZYBQA3QxmmEUygGTvVzHunGnk4oEjGV0w8OJa9EskmKe 6UIWD73lnNe9RAsFl9T3k+3G0Ieajp+GtzFfa/4f6ljg9oJxqcArHpC9rDL3qnvhtm 6TC0eVHmZ/HvD/5ruz0+S01wKOwrpb9McGIUsVjVTkus4D4oPprh0Mc1nuri07smtB 2kOQULzo4VTmgO1t4AHUN6ryMYO41DUj6dqEprjJ/Fkor+qX6s9Dk5jxC5Hexp7enl SEK+cjTRPm2nQ== Message-ID: <895188b0-b79b-49c0-aba8-c04cb3292e10@kernel.org> Date: Tue, 10 Nov 2026 12:51:40 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [SECURITY] mm: split file arm of unmap_folio() drops RWP PTE state To: n3rd <18670333770@163.com>, "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Cc: "akpm@linux-foundation.org" , "ziy@nvidia.com" , "ljs@kernel.org" , "kas@kernel.org" , Mike Rapoport , "peterx@redhat.com" , "security@kernel.org" References: <3f250fc2.bbe22.1a1c5441381.Coremail.18670333770@163.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <3f250fc2.bbe22.1a1c5441381.Coremail.18670333770@163.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/10/26 12:42, n3rd wrote: > > Hello, > > I am reporting a security bug in the Linux kernel. > > 1. Affected kernel versions > Linux v7.3-rc7 (mainline, built and tested as 7.3.0-rc7) is affected and was > reproduced on two fresh boots. v7.3-rc6 carries the same code and is affected as > well. v7.2.9 does not have the RWP feature at all, because UFFDIO_RWPROTECT, > UFFD_FEATURE_RWP and VM_UFFD_RWP were added in v7.3, so it is not affected. > Triggering additionally requires CONFIG_TRANSPARENT_HUGEPAGE for the PTE mapped > shmem big folio and CONFIG_USERFAULTFD_RWP. There is no upstream fix as of v7.3- > rc7 and no CVE has been assigned. Please don't indicate uffd problems where we lose a pte bit as a security problem. It's not. -- Cheers, David