{"id":102509,"date":"2021-12-07T15:37:11","date_gmt":"2021-12-07T13:37:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/tretya-redakcziya-patchej-dlya-yadra-linux-s-podderzhkoj-yazyka-rust"},"modified":"2021-12-07T15:37:11","modified_gmt":"2021-12-07T13:37:11","slug":"tretya-redakcziya-patchej-dlya-yadra-linux-s-podderzhkoj-yazyka-rust","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/tretya-redakcziya-patchej-dlya-yadra-linux-s-podderzhkoj-yazyka-rust","title":{"rendered":"Tretia verzia patchov pre Linuxov\u00e9 jadro s podporou jazyka Rust","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Miguel Ojeda, autor projektu Rust-for-Linux, navrhol pre v\u00fdvoj\u00e1rov jadra Linux tretiu variantu komponentov pre v\u00fdvoj ovl\u00e1da\u010dov zariaden\u00ed v jazyku Rust. Podpora Rustu sa pova\u017euje za experiment\u00e1lnu, no u\u017e bola schv\u00e1len\u00e1 na zaradenie do vetvy linux-next. V\u00fdvoj je financovan\u00fd spolo\u010dnos\u0165ou Google a organiz\u00e1ciou ISRG (Internet Security Research Group), ktor\u00e1 je zakladate\u013eom projektu Let's Encrypt a prispieva k propag\u00e1cii HTTPS a rozvoju technol\u00f3gi\u00ed na zv\u00fd\u0161enie bezpe\u010dnosti internetu.            <\/p>\n<p>Pripome\u0148me, \u017ee navrhovan\u00e9 zmeny umo\u017e\u0148uj\u00fa pou\u017e\u00edva\u0165 Rust ako druh\u00fd jazyk na v\u00fdvoj ovl\u00e1da\u010dov a modulov jadra. Podpora Rust sa prezentuje ako mo\u017enos\u0165, ktor\u00e1 nie je predvolene akt\u00edvna a nevedie k zaradeniu Rustu medzi povinn\u00e9 zostavovacie z\u00e1vislosti jadra. Pou\u017eitie Rustu na v\u00fdvoj ovl\u00e1da\u010dov umo\u017en\u00ed s minim\u00e1lnym \u00fasil\u00edm vytv\u00e1ra\u0165 bezpe\u010dn\u00e9 a kvalitnej\u0161ie ovl\u00e1da\u010de, zbaven\u00e9 tak\u00fdch probl\u00e9mov ako je pr\u00edstup do pam\u00e4te po jej uvo\u013enen\u00ed, dereferencovanie nulov\u00fdch ukazovate\u013eov a prete\u010denie vyrovn\u00e1vacej pam\u00e4te.    <\/p>\n<p>Bezpe\u010dn\u00e1 pr\u00e1ca s pam\u00e4\u0165ou je v Rust zabezpe\u010den\u00e1 po\u010das kompil\u00e1cie prostredn\u00edctvom overovania referenci\u00ed, sledovania vlastn\u00edctva objektov a zoh\u013eadnenia \u017eivotnosti objektov (oblasti vidite\u013enosti), ako aj prostredn\u00edctvom hodnotenia spr\u00e1vnosti pr\u00edstupu k pam\u00e4ti po\u010das vykon\u00e1vania k\u00f3du. Rust tie\u017e poskytuje prostriedky na ochranu pred prete\u010den\u00edm celo\u010d\u00edseln\u00fdch hodn\u00f4t, vy\u017eaduje povinn\u00fa inicializ\u00e1ciu hodn\u00f4t premenn\u00fdch pred ich pou\u017eit\u00edm, lep\u0161ie spracov\u00e1va chyby v \u0161tandardnej kni\u017enici, aplikuje koncept nemennosti (immutable) odkazov a premenn\u00fdch ako predvolen\u00fdch a pon\u00faka siln\u00fa statick\u00fa typiz\u00e1ciu na minimaliz\u00e1ciu logick\u00fdch ch\u00fdb.    <\/p>\n<p>V novej verzii patchov pokra\u010duje odstr\u00e1nenie pripomienok vyjadren\u00fdch v priebehu diskusie o prvej a druhej verzii patchov. Najv\u00fdraznej\u0161ie zmeny s\u00fa:  <\/p>\n<ul>\n<li class=\"l\"> Pre\u0161lo sa na pou\u017e\u00edvanie stabilnej verzie kompil\u00e1tora Rust 1.57 ako referen\u010dn\u00e9ho a zabezpe\u010dila sa v\u00e4zba na stabilizovan\u00fa ed\u00edciu jazyka Rust 2021. Predt\u00fdm boli patche naviazan\u00e9 na beta vetvu Rust a vyu\u017e\u00edvali niektor\u00e9 mo\u017enosti jazyka, ktor\u00e9 spadaj\u00fa do kateg\u00f3rie nestabiln\u00fdch funkci\u00ed. Prechod na \u0161pecifik\u00e1ciu Rust 2021 umo\u017enil iniciova\u0165 pr\u00e1cu na odstr\u00e1nen\u00ed pou\u017eitia nestabiln\u00fdch funkci\u00ed v patchoch, ako s\u00fa const_fn_transmute, const_panic, const_unreachable_unchecked a core_panic a try_reserve.\n<li class=\"l\"> Pokra\u010duje v\u00fdvoj s\u00fa\u010das\u0165ou patchov variantu Rust-kni\u017enice alloc, ktor\u00e1 bola upraven\u00e1 na zbavenie funkci\u00ed rozde\u013eovania pam\u00e4te mo\u017enej gener\u00e1cie stavu \u201epanic\u201c pri v\u00fdskytu ch\u00fdb, ako je nedostatok pam\u00e4te. V novej verzii s\u00fa implementovan\u00e9 mo\u017enosti \u201eno_rc\u201c a \u201eno_sync\u201c na vypnutie funk\u010dnosti, ktor\u00e1 sa v Rust-k\u00f3de pre jadro nepou\u017e\u00edva, \u010do rob\u00ed kni\u017enicu modul\u00e1rnej\u0161ou. Pokra\u010duje spolupr\u00e1ca s hlavn\u00fdmi v\u00fdvoj\u00e1rmi alloc, zameran\u00e1 na presun potrebn\u00fdch zmien pre jadro do hlavn\u00e9ho s\u00faboru kni\u017enice. Do z\u00e1kladnej kni\u017enice Rust (core) bola prenesen\u00e1 mo\u017enos\u0165 \u201eno_fp_fmt_parse\u201c, nevyhnutn\u00e1 na fungovanie kni\u017enice na \u00farovni jadra.\n<li class=\"l\"> Bola vykonan\u00e1 \u00fadr\u017eba k\u00f3du na odstr\u00e1nenie mo\u017en\u00fdch varovan\u00ed kompil\u00e1tora pri zostavovan\u00ed jadra v re\u017eime CONFIG_WERROR. Pri zostavovan\u00ed k\u00f3du v jazyku Rust boli zahrnut\u00e9 \u010fal\u0161ie diagnostick\u00e9 re\u017eimy kompil\u00e1tora a varovania lintera Clippy.\n<li class=\"l\"> Navrhnut\u00e9 s\u00fa abstrakcie na pou\u017eitie v k\u00f3de jazyka Rust pre blokovanie seqlock (sekven\u010dn\u00e9 z\u00e1mky), sp\u00e4tne volania na spr\u00e1vu nap\u00e1jania, I\/O Memory (readX\/writeX), obsluhu preru\u0161enia a pr\u00fadov, GPIO, pr\u00edstup k zariadeniam, ovl\u00e1da\u010dom a \u00fadajom.\n<li class=\"l\"> Roz\u0161\u00edren\u00e9 prostriedky na v\u00fdvoj ovl\u00e1da\u010dov s pou\u017eit\u00edm pres\u00favate\u013en\u00fdch mutexov, bitov\u00fdch iter\u00e1torov, zjednodu\u0161en\u00fdch obalov okolo ukazovate\u013eov, vylep\u0161enej diagnostiky por\u00fach a infra\u0161trukt\u00fary, ktor\u00e1 nie je z\u00e1visl\u00e1 od d\u00e1tovej zbernice.\n<li class=\"l\"> Zlep\u0161en\u00e1 pr\u00e1ca so referenciami pomocou zjednodu\u0161en\u00e9ho typu Ref, ktor\u00fd je zalo\u017een\u00fd na backendu refcount_t a vyu\u017e\u00edva rovnomenn\u00e9 API jadra na po\u010d\u00edtanie referenci\u00ed. Podpora typov Arc a Rc, poskytovan\u00fdch v \u0161tandardnej kni\u017enici alloc, bola odstr\u00e1nen\u00e1 a nie je dostupn\u00e1 v k\u00f3de, ktor\u00fd be\u017e\u00ed na \u00farovni jadra (pre samotn\u00fa kni\u017enicu s\u00fa pripraven\u00e9 mo\u017enosti, ktor\u00e9 tieto typy vyp\u00ednaj\u00fa).\n<li class=\"l\"> Do patchov bol pridan\u00fd variant ovl\u00e1da\u010da PL061 GPIO, prep\u00edsan\u00fd na Rust. \u0160peci\u00e1lnos\u0165ou ovl\u00e1da\u010da je to, \u017ee jeho implement\u00e1cia prakticky riadok po riadku opakuje existuj\u00faci ovl\u00e1da\u010d GPIO v jazyku C. Pre v\u00fdvoj\u00e1rov, ktor\u00ed sa chc\u00fa obozn\u00e1mi\u0165 s vytv\u00e1ran\u00edm ovl\u00e1da\u010dov na Rust, bolo pripraven\u00e9 riadkov\u00e9 porovnanie, ktor\u00e9 umo\u017e\u0148uje pochopi\u0165, do ak\u00fdch kon\u0161trukci\u00ed na Rust bol pretransformovan\u00fd k\u00f3d na C.\n<li class=\"l\"> Do z\u00e1kladn\u00e9ho k\u00f3du jazyka Rust bol prijat\u00fd rustc_codegen_gcc, backend rustc pre GCC, ktor\u00fd implementuje mo\u017enos\u0165 predkompil\u00e1cie (AOT) s pou\u017eit\u00edm kni\u017enice libgccjit. Pri riadnom rozvoji backendu umo\u017en\u00ed kompilova\u0165 pou\u017eit\u00fd v jadre k\u00f3d Rust pomocou GCC.\n<li class=\"l\"> Okrem spolo\u010dnost\u00ed ARM, Google a Microsoft, z\u00e1ujem o pou\u017eitie jazyka Rust v jadre Linux vyjadrila aj spolo\u010dnos\u0165 Red Hat. Pripom\u00edname, \u017ee Google priamo zabezpe\u010duje podporu projektu Rust for Linux, vyv\u00edja nov\u00fa implement\u00e1ciu mechanizmu medzi procesn\u00fdm zdie\u013ean\u00edm Binder na Rust a zva\u017euje prepracovanie r\u00f4znych ovl\u00e1da\u010dov na Rust. Spolo\u010dnos\u0165 Microsoft za\u010dala s implement\u00e1ciou ovl\u00e1da\u010dov pre Hyper-V na Rust. Spolo\u010dnos\u0165 ARM pracuje na zlep\u0161en\u00ed podpory Rust pre syst\u00e9my zalo\u017een\u00e9 na procesoroch ARM. Spolo\u010dnos\u0165 IBM implementovala podporu Rust do jadra pre syst\u00e9my PowerPC.      <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56295\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u0438\u0433\u0435\u043b\u044c \u041e\u0445\u0435\u0434\u0430 (Miguel Ojeda), \u0430\u0432\u0442\u043e\u0440 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Rust-for-Linux, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u043c\u0438 \u044f\u0434\u0440\u0430 Linux \u0442\u0440\u0435\u0442\u0438\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432 \u0434\u043b\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u043e\u0432 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Rust. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 Rust \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u0430\u044f, \u043d\u043e \u0443\u0436\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0432\u0435\u0442\u043a\u0443 linux-next. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0444\u0438\u043d\u0430\u043d\u0441\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Google \u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0435\u0439 ISRG (Internet Security Research Group), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0443\u0447\u0440\u0435\u0434\u0438\u0442\u0435\u043b\u0435\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Let&#8217;s Encrypt \u0438 \u0441\u043f\u043e\u0441\u043e\u0431\u0441\u0442\u0432\u0443\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102509","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041c\u0438\u0433\u0435\u043b\u044c \u041e\u0445\u0435\u0434\u0430 (Miguel Ojeda), \u0430\u0432\u0442\u043e\u0440 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