From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16A17C83029 for ; Mon, 30 Jun 2025 13:41:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A74286B00DB; Mon, 30 Jun 2025 09:41:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A24946B00DC; Mon, 30 Jun 2025 09:41:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8EC756B00DD; Mon, 30 Jun 2025 09:41:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 7B1F66B00DB for ; Mon, 30 Jun 2025 09:41:31 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 4D9D1106128 for ; Mon, 30 Jun 2025 13:41:31 +0000 (UTC) X-FDA: 83612179182.16.4A87CDB Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf03.hostedemail.com (Postfix) with ESMTP id D2F582000D for ; Mon, 30 Jun 2025 13:41:28 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="dG/8Mk/U"; spf=pass (imf03.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1751290889; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=0k2rxKDyTrLeAGCInolANnXu3A8lQ0DXnhu+vRzUrjA=; b=c2UJ7GCoW0HGSy90PjT4OeP/aTvr/eMrcJEjxB3ZmzrpW/JxZOTk7ElvHXUJ1ejo5k/ULj P6qWMIqGsfyBa79yV6VvPrqTVfQwBPd2RTwH4IYZmVF8J7NcTDdADHAfHlGmOGaBLo/1qX 9d0E+Gagin2drdyapxObixOCXciAjRc= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="dG/8Mk/U"; spf=pass (imf03.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1751290889; a=rsa-sha256; cv=none; b=qFBcNuo4tDidqLwAJo3wCw0+myqsgb8UPXbfVLMcG4DslLqMW8HN7tsZNmL8txTbsYr/Zh Nvi2Sx6IN97L5GxeGf7g6cMi/ylnvZ6oxIDa0DUiHy3nfsZxe7w0po44bN3RLMBkbgOGar RMwev8D1FZ42Aiq4uKaM3YpaOXG6eY8= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1751290888; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=0k2rxKDyTrLeAGCInolANnXu3A8lQ0DXnhu+vRzUrjA=; b=dG/8Mk/UsZqu2k7WKsIcAV+9IIaFwzK1jF2k4OAyGwCy5lV/TSQNVUhbzZsBksLqDYTPso QtGBSL7Zk8qQUug3stPerzIdvimky3skGBruNBqJLsHTDosS5iPRQxrPSe0Eh/E9gmjLsx 4uYHPpWURi1C+akph4vE4CVWa5n4UZY= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-12-_oEs5c8wMMiC6ewUpJoayQ-1; Mon, 30 Jun 2025 09:41:26 -0400 X-MC-Unique: _oEs5c8wMMiC6ewUpJoayQ-1 X-Mimecast-MFC-AGG-ID: _oEs5c8wMMiC6ewUpJoayQ_1751290885 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-451deff247cso26241245e9.1 for ; Mon, 30 Jun 2025 06:41:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751290884; x=1751895684; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=0k2rxKDyTrLeAGCInolANnXu3A8lQ0DXnhu+vRzUrjA=; b=aIfJgeAPDiImafleolTouZgHSwpGPUUMzZz2tD0WCc8GLRtpFYvhzJRZvUKH1UQXLD W/g4KboR3HmhVo+DDB3wDR6DXNsOP8EWZ3j1ULPYO8cZiSaWLoS9cn3zKG1u0rlweTtH +jvYnXLvwGUzhb6BSVSe//KeHQmwzIxCL9H31wE4jSngcrCimMMveY2RdZOCLmPe92ZS FW3gSMIEECYXrACiia7yrobyqzJUWsPs9mUCual/b440G6gdavp8srdcM/inaJPeUQhg a4cIcpMRQLvaN3oK0lY5VMQdkZSfWdxOqekHOzMotzMjzPR4763lA63wzVPAZDE3bViI GPMw== X-Forwarded-Encrypted: i=1; AJvYcCU9kM4vwXPRV2b7SHpIT4pgYx5qa87Q/wrZMa4tYk389Zs27/Ql9iN67TVKxLoqEQ4sNzGRTwRYrQ==@kvack.org X-Gm-Message-State: AOJu0YyLLrh6/qVdCYNlzJLDkBLYLeWykLyGvPlmZiNZ7tQYpPvg72mT 0aViPeJzB9B/ZF3CXltik3b9CHbVUZzmJBKiMNJkOSbXj++2uMhOEWu9wfhev7Qr5x1Wj9NiU0c aiP1ekAefDhlNdSAbXsK4lNf5KlJLZwXw2EkBnKCmBzevhw5AOipE X-Gm-Gg: ASbGncvGgBacGcxYb83x/0tvu2vXoGW4YeVpMlkJ2UyXA6x9SjcDrp7IkgJvl/3hl90 og8lCn+SwqsHHkPmhzgJ0fD0EzdCtMo+nKcN8EXtfm7jConTyIhoK5ZS3sL4VTTVNChhgN96jiz xIxcawkDclgsA4D74z3iC2P5X0lcL5vE5rtjkJQjhFHnYwhYw8knhN0Yt/nTBWOYoO/sZ5kSFv8 4+SMeW+HjkNa1gXOKmHp+Gm1T7hT9+3k4B9QU5KUWtrygUMFQJsKAKhbUNMZJFHUZxXnjDrV6lH xb3vHwDH3X+VIzT1n6mP/Vd3uvFSZx+72ARuVuveslNWig75sSXhfeN7rowTyAOZ6J3PxVncW1+ cXK7rKS9vKXl2x+ZCkgfH/wTylZaLHP4oMxMOkHBlOMqV1EZmNg== X-Received: by 2002:a05:600c:6212:b0:43c:f3e1:a729 with SMTP id 5b1f17b1804b1-45388a0371cmr160686045e9.12.1751290884446; Mon, 30 Jun 2025 06:41:24 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHrR723N0U4a8LBGYdriPUXtPEH33drejJE1WXOFzTtappaVkC0Rw6pAoF4eAVkr6seqmnUEg== X-Received: by 2002:a05:600c:6212:b0:43c:f3e1:a729 with SMTP id 5b1f17b1804b1-45388a0371cmr160685765e9.12.1751290883904; Mon, 30 Jun 2025 06:41:23 -0700 (PDT) Received: from ?IPV6:2003:d8:2f40:b300:53f7:d260:aff4:7256? (p200300d82f40b30053f7d260aff47256.dip0.t-ipconnect.de. [2003:d8:2f40:b300:53f7:d260:aff4:7256]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4538a3a5b7fsm138954025e9.10.2025.06.30.06.41.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Jun 2025 06:41:23 -0700 (PDT) Message-ID: <498648fd-655e-47b3-8b7b-9c2ee11acc9b@redhat.com> Date: Mon, 30 Jun 2025 15:41:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/1] mm/rmap: fix potential out-of-bounds page table access during batched unmap To: Lorenzo Stoakes , Lance Yang Cc: akpm@linux-foundation.org, 21cnbao@gmail.com, baolin.wang@linux.alibaba.com, chrisl@kernel.org, kasong@tencent.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, ryan.roberts@arm.com, v-songbaohua@oppo.com, x86@kernel.org, huang.ying.caritas@gmail.com, zhengtangquan@oppo.com, riel@surriel.com, Liam.Howlett@oracle.com, vbabka@suse.cz, harry.yoo@oracle.com, mingzhe.yang@ly.com, stable@vger.kernel.org, Barry Song , Lance Yang References: <20250630011305.23754-1-lance.yang@linux.dev> <41483c78-84f2-42fc-b9ab-09823eb796c4@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <41483c78-84f2-42fc-b9ab-09823eb796c4@lucifer.local> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: LJ5CLME19i6GXrO99OhoehjqzUrQGKIk9-8peo8bYS0_1751290885 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: D2F582000D X-Stat-Signature: k51jteb3k46nwxuh74a6cpq793gu7fwu X-HE-Tag: 1751290888-872693 X-HE-Meta: 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 XEqk4pIi 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 30.06.25 15:39, Lorenzo Stoakes wrote: > On Mon, Jun 30, 2025 at 09:13:05AM +0800, Lance Yang wrote: >> From: Lance Yang >> >> As pointed out by David[1], the batched unmap logic in try_to_unmap_one() >> may read past the end of a PTE table when a large folio's PTE mappings >> are not fully contained within a single page table. >> >> While this scenario might be rare, an issue triggerable from userspace must >> be fixed regardless of its likelihood. This patch fixes the out-of-bounds >> access by refactoring the logic into a new helper, folio_unmap_pte_batch(). >> >> The new helper correctly calculates the safe batch size by capping the scan >> at both the VMA and PMD boundaries. To simplify the code, it also supports >> partial batching (i.e., any number of pages from 1 up to the calculated >> safe maximum), as there is no strong reason to special-case for fully >> mapped folios. >> >> [1] https://lore.kernel.org/linux-mm/a694398c-9f03-4737-81b9-7e49c857fcbe@redhat.com >> >> Fixes: 354dffd29575 ("mm: support batched unmap for lazyfree large folios during reclamation") >> Cc: >> Acked-by: Barry Song >> Suggested-by: David Hildenbrand >> Suggested-by: Barry Song >> Signed-off-by: Lance Yang > > This LGTM: > > Reviewed-by: Lorenzo Stoakes > >> --- >> v2 -> v3: >> - Tweak changelog (per Barry and David) >> - Pick AB from Barry - thanks! >> - https://lore.kernel.org/linux-mm/20250627062319.84936-1-lance.yang@linux.dev >> >> v1 -> v2: >> - Update subject and changelog (per Barry) >> - https://lore.kernel.org/linux-mm/20250627025214.30887-1-lance.yang@linux.dev >> >> mm/rmap.c | 46 ++++++++++++++++++++++++++++------------------ >> 1 file changed, 28 insertions(+), 18 deletions(-) >> >> diff --git a/mm/rmap.c b/mm/rmap.c >> index fb63d9256f09..1320b88fab74 100644 >> --- a/mm/rmap.c >> +++ b/mm/rmap.c >> @@ -1845,23 +1845,32 @@ void folio_remove_rmap_pud(struct folio *folio, struct page *page, >> #endif >> } >> >> -/* We support batch unmapping of PTEs for lazyfree large folios */ >> -static inline bool can_batch_unmap_folio_ptes(unsigned long addr, >> - struct folio *folio, pte_t *ptep) >> +static inline unsigned int folio_unmap_pte_batch(struct folio *folio, >> + struct page_vma_mapped_walk *pvmw, >> + enum ttu_flags flags, pte_t pte) >> { >> const fpb_t fpb_flags = FPB_IGNORE_DIRTY | FPB_IGNORE_SOFT_DIRTY; >> - int max_nr = folio_nr_pages(folio); >> - pte_t pte = ptep_get(ptep); >> + unsigned long end_addr, addr = pvmw->address; >> + struct vm_area_struct *vma = pvmw->vma; >> + unsigned int max_nr; >> + >> + if (flags & TTU_HWPOISON) >> + return 1; >> + if (!folio_test_large(folio)) >> + return 1; >> >> + /* We may only batch within a single VMA and a single page table. */ >> + end_addr = pmd_addr_end(addr, vma->vm_end); >> + max_nr = (end_addr - addr) >> PAGE_SHIFT; >> + >> + /* We only support lazyfree batching for now ... */ >> if (!folio_test_anon(folio) || folio_test_swapbacked(folio)) >> - return false; >> + return 1; >> if (pte_unused(pte)) >> - return false; >> - if (pte_pfn(pte) != folio_pfn(folio)) >> - return false; >> + return 1; >> >> - return folio_pte_batch(folio, addr, ptep, pte, max_nr, fpb_flags, NULL, >> - NULL, NULL) == max_nr; >> + return folio_pte_batch(folio, addr, pvmw->pte, pte, max_nr, fpb_flags, >> + NULL, NULL, NULL); > > I guess this will conflict with David's changes, but maybe in this simpler case > and given this was existing code a bit less? Anyway let's see. It's a fix, so this is fine to go in first. (I already rebased on top of mm/mm-new where this is in) Acked-by: David Hildenbrand -- Cheers, David / dhildenb