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To: Alexei Starovoitov Cc: bpf , Daniel Borkmann , Andrii Nakryiko , Kumar Kartikeya Dwivedi , Eddy Z , Tejun Heo , Barret Rhoden , Johannes Weiner , Lorenzo Stoakes , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , linux-mm , Kernel Team References: <20240209040608.98927-1-alexei.starovoitov@gmail.com> <8dd6d3c0-6b76-480c-8fba-3b0e50fd9040@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: 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: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: DF1841C000D X-Stat-Signature: t4r5cyj5uyrsschm4o17ectfma55oezn X-Rspam-User: X-HE-Tag: 1707820537-229173 X-HE-Meta: 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 cUz4bMcz 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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 12.02.24 19:14, Alexei Starovoitov wrote: > On Mon, Feb 12, 2024 at 6:14 AM David Hildenbrand wrote: >> >> How easy is this to access+use by unprivileged userspace? > > not possible. bpf arena requires cap_bpf + cap_perfmon. > >> arena_vm_fault() seems to allocate new pages simply via >> alloc_page(GFP_KERNEL | __GFP_ZERO); No memory accounting, mlock limit >> checks etc. > > Right. That's a bug. As Kumar commented on the patch 5 that it needs to > move to memcg accounting the way we do for all other maps. > It will be very similar to bpf_map_kmalloc_node(). > Great, thanks! -- Cheers, David / dhildenb