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[2003:cb:c705:7600:62cc:24c1:9dbe:a2f5]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d7fbf814esm6615837f8f.68.2024.10.17.02.17.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 17 Oct 2024 02:17:20 -0700 (PDT) Message-ID: Date: Thu, 17 Oct 2024 11:17:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf] lib/buildid: handle memfd_secret() files in build_id_parse() To: Shakeel Butt , Andrii Nakryiko Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, martin.lau@kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org, Yi Lai , pbonzini@redhat.com, seanjc@google.com, tabba@google.com, jackmanb@google.com, yosryahmed@google.com, jannh@google.com, rppt@kernel.org References: <20241014235631.1229438-1-andrii@kernel.org> <2rweiiittlxcio6kknwy45wez742mlgjnfdg3tq3xdkmyoq5nn@g7bfoqy4vdwt> 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: <2rweiiittlxcio6kknwy45wez742mlgjnfdg3tq3xdkmyoq5nn@g7bfoqy4vdwt> 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-Stat-Signature: y1aaqknyaxkm4ywi1e39fgjsqe4xdqqa X-Rspamd-Queue-Id: 8F3EB4000A X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1729156633-668618 X-HE-Meta: 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 Cw2hoCmw rvELGXyjWRz+gvpTiVNLHKwFgO0f6oKCdXWi2fXsJu565DA8ruN08qB/quDzbNQL14LOurZ8TkKzpVfLc8Fhn82ghvVmewMWhEKLGVPmWw6igwWQ7l8RvUN6F7+/2dpuXZ59Ze8J5nOEtawUG2dvYBALsG8ColPZEHWeSRN+aywCgzEZBM7gN1QR0yXdlGjg1BHRtR6viXTpTL42unzdSi2aYEGoR63PdqNrDTxTy7ePK5hIBe5dtRfsXjoTGOuZkUT/bN3VmKQ1u2Vey85NfIZxtkfteR8Ot+ALvFLUHjX9VGLaXlF/CvE60WAt2d079kPF/m7M4RqzfLIJvF6+3KNC/pUdhIr4bezeb6iXJw081T4crI8+TjduSML5Tt7Pe+y2q/oRSh4F++RLmCbQY9U7MEfFUX4jFmaH14JUrESzc/qIhc1R66Bw8hkeqrEp9WpQy 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 16.10.24 20:39, Shakeel Butt wrote: > Ccing couple more folks who are doing similar work (ASI, guest_memfd) > > Folks, what is the generic way to check if a given mapping has folios > unmapped from kernel address space? Can't we just lookup the mapping and refuse these folios that really shouldn't be looked at? See gup_fast_folio_allowed() where we refuse secretmem_mapping(). -- Cheers, David / dhildenb