From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDCE33CF95A; Fri, 16 Oct 2026 07:40:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792136451; cv=none; b=C0tWZ74SB3C1//DpSbDG2JFvWoVWG6rQ8CeoEmvBaEqTyfSzlXtJUgbq29o+bO1l5lG2mA8Y2H9TQE1asRM4JMTwuArPLNTbn4Nx8ne/eoBK6lmvq1si0VAaRNDy6xCT/YrPeXVyWA+/kFKPxKd1DcOm2lhqmUQLkbDHLJc9KMk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792136451; c=relaxed/simple; bh=9YHeeSkEad9lcO7e8anS5ZoWgjCCJVfc2anH4fFucFM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=sWz5TdWtpaet9w9ZS2QQRSWPxHHokOJvNVVhIlpkThL48/i+5DLPS/+1COgQrurdWmLbpJ1LnE7Oj+Uq8k8drTNtls+5erUtOAAlA2j3oq+GD1jSGhwhml29QRpZ/tvnYTZPv8SNdPaAxC47AU07SfusYTBfUyJufH/ihlNPoWM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QeHXOyzS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QeHXOyzS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C33181F000C4; Fri, 16 Oct 2026 07:40:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792136449; bh=YqKGI+j411IZYdGH/R2G+obmJPd4f+afYx7B7iKNFqc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=QeHXOyzSZlJf70cWT/G9GYdva8YdkpRA+kCN//bbbUSjuZ7nWsJH54DybwORCfd9O W843SNlU4sGXHAKMmjVD8EK9Zi1PzPv30x9j6lDm8DpxYg9EQN6qBC+cTVOWZi+bLG VN9dfd/0oNUAN9WBzzdgnxFQSLsVzLefFO5dBJ1+5Jud+89Mr41LYn/oHUtdb/kzTv Xac9eEDNLrL9P7kRVDsaxW4jp7GYf24FX052aJLv8oEKxk9f8MoeTr3RusV+KQRyUi NRg+kq4wJ80ILSX03Dj+B1a4myJGi0IPit/JZM/K5s+tYThRxQ7d6xlrKPrGbOz3Gi MPVQOHeVUPOKw== Message-ID: <02ce93f0-b5ea-4b7b-baea-3b3035c8c2e6@kernel.org> Date: Fri, 16 Oct 2026 09:40:40 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/10] mm: various (urgent?) fixes To: Muchun Song Cc: Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , Pedro Falcato , Oscar Salvador , Miaohe Lin , Naoya Horiguchi , Adam Litke , Mel Gorman , Rik van Riel , Peter Xu , "Kiryl Shutsemau (Meta)" , "Mike Rapoport (Microsoft)" , Josef Bacik , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Chris Mason References: <20261015-urgent_fixes-v1-0-42796911043b@kernel.org> 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/16/26 09:15, Muchun Song wrote: > > >> On Oct 16, 2026, at 00:07, David Hildenbrand (Arm) wrote: >> >> Hi, >> >> here are various MM fixes. The majority was reported by Josef at >> Anthrophic, the remainder was found while reviewing/overhauling them. >> >> Two issues/fixes reported are not included, as we are discussing >> (better) alternatives on the list already. >> >> I left most of the original commit messages as schloppy as they are: I >> don't particularly care as long as the code is in good shape and as long as >> they are not actively wrong. But I (and Mike) could not be stopped from >> overhauling at least some of them. >> >> While I don't think there is anything too critical in here, I think this >> is a good opportunity to see how fast we can get pre-screened/pre-reviewed >> fixes upstream that might be security-related. >> >> The majority are hugetlb + uffd issues, that are not actually that >> relevant for most installations. But all things that should just get >> fixed. Some uffd fixes need proper follow ups to fix some more of the >> root causes of leftover UFFD PTE bits (or proof that there are none >> remaining). >> >> I ran some MM selftests and nothing popped up. >> >> So let's try to get these upstream in a timely fashion. >> >> Signed-off-by: David Hildenbrand (Arm) >> --- >> David Hildenbrand (Arm) (4): >> mm/hugetlb: fix use-after-free in hugetlb_mfill_atomic_pte() >> mm/hugetlb: tolerate uffd bits set without uffd for PROT_NONE PTEs >> mm/hugetlb: tolerate UFFD_WP markers outside uffd-wp VMAs >> mm/mremap: fix calling fixup_hugetlb_reservations() on the wrong VMA >> >> Josef Bacik (6): >> mm/vma: don't leak the commit charge on mmap failure >> mm/hugetlb: fix use-after-free of a new anon folio >> mm/hugetlb: unmap the page where the other VMA maps it >> mm/hugetlb: don't clear the resv_map of a VMA whose lock is held >> mm/hugetlb: fix endless write fault on a leftover uffd bit >> mm/hugetlb: don't leave a uffd-wp marker when zapping an RWP entry > > HugeTLB is really nasty, while no new features are landing, we have a steady > stream of bug fixes coming in. Yes, and so far it's mostly due to: * PMD table sharing * Reservation handling * Userfaultfd Which is no surprise given how people already felt about most of these features in the past :) -- Cheers, David