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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2650FC4167B for ; Mon, 27 Nov 2023 14:52:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233599AbjK0Owp (ORCPT ); Mon, 27 Nov 2023 09:52:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233500AbjK0Owl (ORCPT ); Mon, 27 Nov 2023 09:52:41 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7152412C for ; Mon, 27 Nov 2023 06:52:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1701096766; 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=uPMdEaR1bFuFwWa5h+7LUuVNPwUDa76Ht8PnHb4rFZA=; b=dzsi6PatfQMxscr/wBsin2i4hIFh8EywxE5ryfCG0hTMB1yUIQCPYkspGH66dNuzN7Ztd+ 4ldJJQ1Ik5Jh6AXHx1LRibvZODXS1iW1vnlmYbuQoWdiq6bktMRF8EmO8HsnMazbdHev0S hW0moPByz136fSKetS+nkyX/PN/YZY8= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-217-TOPPJBGMNFyq57vrILkhLA-1; Mon, 27 Nov 2023 09:52:45 -0500 X-MC-Unique: TOPPJBGMNFyq57vrILkhLA-1 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-332e2f70092so3054099f8f.0 for ; Mon, 27 Nov 2023 06:52:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701096764; x=1701701564; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :references:cc:to:content-language:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=uPMdEaR1bFuFwWa5h+7LUuVNPwUDa76Ht8PnHb4rFZA=; b=GLnns5FllDen+u3kXisiLawFdhwvWDXpYPbm1rvEoU0TI98wCYSK4GrM255SO09B4N EfTnNKYNHxaYPH1uiJqJ7rAD+z7EJpqC89V3vHS3GN91CxcpKiR/wGb5YDqsvC9TIJxt 9Qpo4jrebB+61ZzZ+IelHhy8Q96IDmNp5SeCwrpnmytmtYWpFWZJ+YlvDaepU5NsMuEV 1tyWYHHiVa8ErjaX61Q2Z0bNWRJnLONI87wXCjJ1L9EXOSyZFkzM+eDPG452iGzpyuE1 3bavIfeKDaPSxdxE/JUU37Iq4LC/52xURUFgv9p8nkqqnyXnDXz2FeL99nHOa6XAuLha 9t8A== X-Gm-Message-State: AOJu0YwsfxISVF9FKavT0pRgaFNtev4Oiy7y0fLIIwmBNyi9RWnqq+Sv kIaa2vYpPjo6gOKGQMkNUIGLuYhDQdV7x/l+eRdeikIs5g5SjtYbWk3ntA5AugFPcjb7FLY4cWN kRO/XZy+99+xw4was++0eOGg5 X-Received: by 2002:adf:fd48:0:b0:332:e9f7:9a99 with SMTP id h8-20020adffd48000000b00332e9f79a99mr7627802wrs.43.1701096764105; Mon, 27 Nov 2023 06:52:44 -0800 (PST) X-Google-Smtp-Source: AGHT+IEu9dQXw1X4i9BPbPJz3iTQGpU1unhqvEW3IqKjbvAaWLBKcLqIrJxs3bIDw1rQF1Vs3JHa/Q== X-Received: by 2002:adf:fd48:0:b0:332:e9f7:9a99 with SMTP id h8-20020adffd48000000b00332e9f79a99mr7627788wrs.43.1701096763749; Mon, 27 Nov 2023 06:52:43 -0800 (PST) Received: from ?IPV6:2003:cb:c745:2a00:d74a:a8c5:20b6:3ec3? (p200300cbc7452a00d74aa8c520b63ec3.dip0.t-ipconnect.de. [2003:cb:c745:2a00:d74a:a8c5:20b6:3ec3]) by smtp.gmail.com with ESMTPSA id m5-20020a5d56c5000000b00332cbd59f8bsm12212326wrw.25.2023.11.27.06.52.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Nov 2023 06:52:43 -0800 (PST) Message-ID: Date: Mon, 27 Nov 2023 15:52:42 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] prctl: Get private anonymous memory region name Content-Language: en-US To: Oleg Nesterov , Rong Tao Cc: Andrew Morton , Catalin Marinas , Kees Cook , Florent Revest , Josh Triplett , Andy Chiu , Joey Gouly , Stefan Roesch , Greg Kroah-Hartman , Ondrej Mosnacek , Miguel Ojeda , "open list:MEMORY MANAGEMENT" , open list , rongtao@cestc.cn References: <20231126135644.GA7199@redhat.com> 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: <20231126135644.GA7199@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 26.11.23 14:56, Oleg Nesterov wrote: > On 11/26, Rong Tao wrote: >> >> then the PR_GET_VMA interface should be provided accordingly, >> which is necessary, as the userspace program usually wants to know what >> VMA name it has configured for the anonymous page. > > I don't really understand the use-case for PR_GET_VMA ... > Can't we simply read "/proc/PID/maps" and just have that information from there? Also, I don't understand the exact use case, that should be clarified -- especially, why the existing way is insufficient. -- Cheers, David / dhildenb