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(p200300cbc705140078bac2d222a18858.dip0.t-ipconnect.de. [2003:cb:c705:1400:78ba:c2d2:22a1:8858]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-360750f2295sm15269409f8f.82.2024.06.18.15.04.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Jun 2024 15:04:25 -0700 (PDT) Message-ID: <1454f3e5-8b42-4568-a6c2-a0872397230a@redhat.com> Date: Wed, 19 Jun 2024 00:04:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/6] selftests/mm: mseal, self_elf: fix missing __NR_mseal To: John Hubbard , Andrew Morton , Jeff Xu , Shuah Khan Cc: Andrei Vagin , Axel Rasmussen , Christian Brauner , Kees Cook , Kent Overstreet , "Liam R . Howlett" , Muhammad Usama Anjum , Peter Xu , Rich Felker , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, LKML References: <20240618022422.804305-1-jhubbard@nvidia.com> <20240618022422.804305-2-jhubbard@nvidia.com> <0b152bea-ccb6-403e-9c57-08ed5e828135@redhat.com> <9d08f768-b9da-4a44-9d75-a16d6cde6b66@nvidia.com> <916f5ba4-02c4-4a33-97e1-5343bde5ae54@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: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: BFC1EC0024 X-Stat-Signature: 9nykdwjgp837b4fyr39hemu1h7bcmpay X-Rspam-User: X-HE-Tag: 1718748269-750891 X-HE-Meta: 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 uO+cl950 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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 18.06.24 23:29, John Hubbard wrote: > On 6/18/24 1:54 PM, David Hildenbrand wrote: >> On 18.06.24 22:14, John Hubbard wrote: >>> On 6/17/24 11:56 PM, David Hildenbrand wrote: >>>> On 18.06.24 04:24, John Hubbard wrote: >>> ... > ... >>> I can update the commit description with some of the above, if it helps. >> >> I think it will. The main concern I had was that we could be ending up including headers with *wrong* data. As long as (a) it compiles where it's supposed to compile (b) it runs where it's supposed to run, we're good :) >> > > OK, I've drafted an updated commit description (below), and in order > to reduce email churn perhaps it's best for me to hold onto it for a > day or two, while we see how v3 fares in linux-next. (Thanks, Andrew, > for patching that up with my Makefile fix.) > > Here's the draft: > selftests/mm: mseal, self_elf: fix missing __NR_mseal > > The selftests/mm build isn't exactly "broken", according to the current > documentation, which still claims that one must run "make headers", > before building the kselftests. However, according to the new plan to > get rid of that requirement [1], they are future-broken: attempting to > build selftests/mm *without* first running "make headers" will fail due > to not finding __NR_mseal. > > Therefore, include asm-generic/unistd.h, which has all of the system > call numbers that are needed, abstracted across the various CPU arches. > > Some explanation in support of this "asm-generic" approach: > > For most user space programs, the header file inclusion behaves as > per this microblaze example, which comes from David Hildenbrand > (thanks!) : > > arch/microblaze/include/asm/unistd.h > -> #include > > arch/microblaze/include/uapi/asm/unistd.h > -> #include > -> Generated during "make headers" > > usr/include/asm/unistd_32.h is generated via > arch/microblaze/kernel/syscalls/Makefile with the syshdr command. > > So we never end up including asm-generic/unistd.h directly on > microblaze... [2] > > However, those programs are installed on a single computer that has a > single set of asm and kernel headers installed. > > In contrast, the kselftests are quite special, because they must provide > a set of user space programs that: > > a) Mostly avoid using the installed (distro) system header files. > > b) Build (and run) on all supported CPU architectures > > c) Occasionally use symbols that have so new that they have not > yet been included in the distro's header files. > > Doing (a) creates a new problem: how to get a set of cross-platform > headers that works in all cases. > > Fortunately, asm-generic headers solve that one. Which is why we need to > use them here--at least, for particularly difficult headers such as > unistd.h. > > The reason this hasn't really come up yet, is that until now, the > kselftests requirement (which I'm trying to eventually remove) was that > "make headers" must first be run. That allowed the selftests to get a > snapshot of sufficiently new header files that looked just like (and > conflict with) the installed system headers. > > And as an aside, this is also an improvement over past practices of > simply open-coding in a single (not per-arch) definition of a new > symbol, directly into the selftest code. > > [1] commit e076eaca5906 ("selftests: break the dependency upon local > header files") > > [2] https://lore.kernel.org/all/0b152bea-ccb6-403e-9c57-08ed5e828135@redhat.com/ > > Fixes: 4926c7a52de7 ("selftest mm/mseal memory sealing") > Cc: Jeff Xu > Cc: David Hildenbrand > Signed-off-by: John Hubbard Thanks! Acked-by: David Hildenbrand -- Cheers, David / dhildenb