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[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 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> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 37F428001A X-Rspam-User: X-Stat-Signature: 5x85aoh6psfc1up4e7wped7763yeih4m X-Rspamd-Server: rspam01 X-HE-Tag: 1701096766-123887 X-HE-Meta: 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 Ne7clYIl kuT3ci3aVzM2WHcpvXx2lJMQJcETNUGZbehtuEm1YovVNn/m/nxcrZGpZIgrSTAfWL+mdYBGrjMZaZJ+51rriSmdxcIDnGARXbOc+FmthVgEElGSm1MTicGr1EWsffX3aDOEgrBeBBccpDJmtlBRTAR3q/aX2aaBjZuAWvVsE52gHdGtlTFS63ifwF+VZPcfWUdI+WicequJ1Wp/NuWMyTb6kIf9skS2Omi/mSnj6j0GTVbwpSqpJCEjxdURQ3uQhSytmx4zflUqTkrqi6AQfXRNl9zpcup9LKN/G3pWGLmQ1M/8zf7+WSzYi3a3q4Ttg7ULsAYBMvg9tYMRWtPzdCr27Q7Lk9DqIB2R/TaWRrbXMVAXBRoIOvi4oWE+J3s6YeV3I/VS9r/oLByNA7o304E7FaigvDHmvU+vFFp4GwilyHeQ= 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 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