{"id":35694,"date":"2019-10-31T22:05:48","date_gmt":"2019-10-31T19:05:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/razrabotchiki-iz-google-predlozhili-razrabotat-svoyu-libc-dlya-llvm\/"},"modified":"2019-10-31T22:05:48","modified_gmt":"2019-10-31T19:05:48","slug":"razrabotchiki-iz-google-predlozhili-razrabotat-svoyu-libc-dlya-llvm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/razrabotchiki-iz-google-predlozhili-razrabotat-svoyu-libc-dlya-llvm","title":{"rendered":"A Google fejleszt\u0151i javasolt\u00e1k egy saj\u00e1t libc fejleszt\u00e9s\u00e9t az LLVM sz\u00e1m\u00e1ra","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Az egyik fejleszt\u0151 a Google-t\u00f3l <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.llvm.org\/pipermail\/llvm-dev\/2019-June\/133269.html\">felvetette<\/a><\/noindex> az LLVM levelez\u0151list\u00e1j\u00e1n a t\u00f6bbplatformos standard C k\u00f6nyvt\u00e1r (Libc) fejleszt\u00e9s\u00e9nek t\u00e9m\u00e1j\u00e1t az LLVM projekt keret\u00e9ben. Sz\u00e1mos okb\u00f3l a Google nem el\u00e9gedett a jelenlegi libc-kkel (glibc, musl), \u00e9s a v\u00e1llalat \u00faj megval\u00f3s\u00edt\u00e1s fejleszt\u00e9s\u00e9n dolgozik, amelyet az LLVM r\u00e9szek\u00e9nt aj\u00e1nlanak fejleszteni.<\/p>\n<p> Az LLVM fejleszt\u00e9sei mostan\u00e1ban a Google telep\u00edt\u00e9si eszk\u00f6zk\u00e9szlet\u00e9nek alapjak\u00e9nt szolg\u00e1lnak. A f\u0151 \u00f6tlet az, hogy ha a Google m\u00e1r elkezdte a libc fejleszt\u00e9s\u00e9t, akkor mi\u00e9rt ne fejleszten\u00e9 az LLVM r\u00e9szek\u00e9nt a saj\u00e1t rendszer\u00e9t, amely m\u00e1r biztos\u00edt egy standard k\u00f6nyvt\u00e1rat C++-hoz (Libc++), de nem rendelkezik hasonl\u00f3 standard k\u00f6nyvt\u00e1rral a C-hez (Libc).<\/p>\n<p>A fejleszt\u00e9st l\u00e9p\u00e9sr\u0151l l\u00e9p\u00e9sre tervezik v\u00e9gezni, fokozatosan n\u00f6velve a funkcionalit\u00e1st. Az els\u0151 verzi\u00f3kat egy alkalmaz\u00e1s \u00e9s a rendszer Libc k\u00f6z\u00f6tti r\u00e9teg form\u00e1j\u00e1ban javasolj\u00e1k kialak\u00edtani, ahonnan a m\u00e9g meg nem val\u00f3s\u00edtott lehet\u0151s\u00e9geket fogj\u00e1k \u00e1tvenni. Miut\u00e1n el\u00e9rtek egy bizonyos funkcionalit\u00e1si szintet, az \u00faj Libc haszn\u00e1lhat\u00f3 lesz a rendszer Libc teljes helyettes\u00edt\u00e9sek\u00e9nt. A fejleszt\u00e9st az x86-64 architekt\u00fara, Linux \u00e9s statikus linkel\u00e9s t\u00e1mogat\u00e1s\u00e1val tervezik kezdeni (a dinamikus bet\u00f6lt\u00e9s, a k\u00f6t\u00e9s \u00e9s a tov\u00e1bbi architekt\u00far\u00e1k m\u00e1sodik l\u00e9p\u00e9sben val\u00f3sulnak meg). <\/p>\n<p>A projekt m\u00e9g csak a kezdeti fejleszt\u00e9si szakaszban van, de m\u00e1r meghat\u00e1rozt\u00e1k az alapvet\u0151 c\u00e9lokat:<\/p>\n<ul>\n<li class=\"l\"> Modularit\u00e1s \u00e9s fejl\u0151d\u00e9s a granularit\u00e1sra \u00e9p\u00fcl\u0151 k\u00f6nyvt\u00e1r \u00e1tad\u00e1s\u00e1nak filoz\u00f3fi\u00e1ja szerint, nem egy monolitikus k\u00e9szlet szerint;\n<li class=\"l\"> A statikus linkel\u00e9s t\u00e1mogat\u00e1sa <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Position-independent_code#PIE\">PIE<\/a><\/noindex> (Poz\u00edci\u00f3f\u00fcggetlen v\u00e9grehajt\u00e1sok) \u00fczemm\u00f3dokban \u00e9s an\u00e9lk\u00fcl. CRT (C fut\u00e1si k\u00f6rnyezet) \u00e9s PIE bet\u00f6lt\u0151 biztos\u00edt\u00e1sa statikusan linkelt v\u00e9grehajthat\u00f3 f\u00e1jlokhoz;\n<li class=\"l\"> A standard C k\u00f6nyvt\u00e1r funkci\u00f3inak legnagyobb r\u00e9sz\u00e9nek t\u00e1mogat\u00e1sa kieg\u00e9sz\u00edt\u0151kkel a POSIX \u00e9s n\u00e9h\u00e1ny megl\u00e9v\u0151 alkalmaz\u00e1sokhoz sz\u00fcks\u00e9ges rendszer-specifikus kiterjeszt\u00e9sekkel;\n<li class=\"l\"> \u00d3vatos hozz\u00e1\u00e1ll\u00e1s a gy\u00e1rt\u00f3k \u00e1ltali kiterjeszt\u00e9sekhez \u00e9s azok csak sz\u00fcks\u00e9g szerint val\u00f3 hozz\u00e1ad\u00e1sa. A harmadik f\u00e9lt\u0151l sz\u00e1rmaz\u00f3 kiterjeszt\u00e9sek t\u00e1mogat\u00e1s\u00e1nak tekintet\u00e9ben a Clang \u00e9s libc++ projektek megk\u00f6zel\u00edt\u00e9s\u00e9t javasolj\u00e1k;\n<li class=\"l\"> A fejleszt\u00e9sben az LLVM eszk\u00f6zk\u00e9szlet haszn\u00e1lat\u00e1val kapcsolatban mintaszer\u0171 gyakorlatok alkalmaz\u00e1sa, mint p\u00e9ld\u00e1ul a sanitizer \u00e9s a fuzzing tesztel\u00e9s az elej\u00e9t\u0151l fogva.\n<\/ul>\n<p>Az LLVM egyik akt\u00edv fejleszt\u0151je <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.llvm.org\/pipermail\/llvm-dev\/2019-June\/133282.html\">megjegyezte<\/a><\/noindex>, hogy az LLVM eszk\u00f6zk\u00e9szlet\u00e9hez tartoz\u00f3 libc sz\u00e1ll\u00edt\u00e1sa nem \u00e9rtelmetlen, de \u00e1ltal\u00e1ban, ha ilyen sz\u00fcks\u00e9g van, a musl k\u00f6nyvt\u00e1rat haszn\u00e1lj\u00e1k, amely j\u00f3l meg\u00edrt, t\u00e1mogatja a k\u00fcl\u00f6nb\u00f6z\u0151 architekt\u00far\u00e1kat, \u00e9s biztos\u00edtja a sz\u00fcks\u00e9ges funkcionalit\u00e1st, bele\u00e9rtve a dinamikus k\u00f6t\u00e9st is. A musl LLVM-be val\u00f3 be\u00e9p\u00edt\u00e9se \u00e9s a f\u0151 projekttel szinkroniz\u00e1lt fork-k\u00e9nt val\u00f3 fejleszt\u00e9s indokolt lehet.<\/p>\n<p>A v\u00e9lem\u00e9ny\u00e9t szint\u00e9n <noindex><a rel=\"nofollow\" href=\"http:\/\/lists.llvm.org\/pipermail\/llvm-dev\/2019-June\/133308.html\">kifejezte<\/a><\/noindex> a Musl projekt szerz\u0151je, aki megpr\u00f3b\u00e1lta megindokolni, hogy mi\u00e9rt rossz \u00f6tlet a Google javaslata \u00e9s a Libc belefoglal\u00e1sa az LLVM sz\u00e1ll\u00edtm\u00e1ny\u00e1ba:<\/p>\n<ul>\n<li class=\"l\"> A helyes, kompatibilis \u00e9s magas min\u0151s\u00e9g\u0171 Libc fejleszt\u00e9se \u00e9s karbantart\u00e1sa nagyon neh\u00e9z feladat. A probl\u00e9ma nem a k\u00f3d mennyis\u00e9g\u00e9ben rejlik, hanem a helyes m\u0171k\u00f6d\u00e9s biztos\u00edt\u00e1s\u00e1ban \u00e9s a C\/C++ nyelven valaha \u00edrt alkalmaz\u00e1sok, valamint m\u00e1s nyelveken k\u00e9sz\u00fclt alkalmaz\u00e1sok interf\u00e9szeinek megval\u00f3s\u00edt\u00e1s\u00e1nak neh\u00e9zs\u00e9geiben, amelyek runtime-ja Libc-t haszn\u00e1l. A frontalit\u00e1s figyelmen k\u00edv\u00fcl hagy\u00e1sa csak ahhoz vezet, hogy sok megl\u00e9v\u0151 program nem tud egy\u00fcttm\u0171k\u00f6dni a Libc-vel, de akkor egy ilyen projekt nem lesz vonz\u00f3 a fogyaszt\u00f3k sz\u00e1m\u00e1ra.\n<li class=\"l\"> A v\u00e1llalati fejleszt\u00e9s t\u00f6nkreteheti a Libc-t, de sz\u00e9les k\u00f6r\u0171 haszn\u00e1latra er\u0151ltethet\u0151, aminek v\u00e9geredm\u00e9nye, hogy hackekre lesz sz\u00fcks\u00e9g a kompatibilit\u00e1s biztos\u00edt\u00e1s\u00e1hoz az alkalmaz\u00e1sokban. A v\u00e1llalati ny\u00edlt projekt \u00e9gisze alatt t\u00f6rt\u00e9n\u0151 fejleszt\u00e9s csak a c\u00e9g ig\u00e9nyei \u00e9s megold\u00e1sai fel\u00e9 fogja h\u00fazni a takar\u00f3t, a k\u00f6z\u00f6ss\u00e9g \u00e9rdekeinek k\u00e1r\u00e1ra. P\u00e9ld\u00e1ul, ha egy probl\u00e9ma mer\u00fcl fel, amely egy m\u00e1sik saj\u00e1t programjuk hib\u00e1j\u00e1b\u00f3l ad\u00f3dik, a kontroll\u00e1lt fejleszt\u00e9sben k\u00f6nnyebb biztos\u00edtani a Libc kompatibilit\u00e1s\u00e1t ezzel a hib\u00e1val, mint mag\u00e1t a hib\u00e1t jav\u00edtani. Az Apple a BSD libc forkj\u00e1t haszn\u00e1lja ezekre a c\u00e9lokra, m\u00edg a Google a Fuchsia eset\u00e9ben a musl forkj\u00e1t alkalmazza. A musl fejleszt\u0151 tapasztalata szerint vele f\u0151leg jog\u00e1szok l\u00e9ptek kapcsolatba a licencel\u00e9si k\u00e9rd\u00e9sek tiszt\u00e1z\u00e1s\u00e1ra, de soha nem fordultak technikai r\u00e9szletek tiszt\u00e1z\u00e1s\u00e1val, miel\u0151tt haszontalan \u00e9s a m\u0171k\u00f6d\u00e9st zavar\u00f3 v\u00e1ltoztat\u00e1sokat vezettek volna be a saj\u00e1t \u00e1gaikba.\n<li class=\"l\"> A libc fejleszt\u00e9s\u00e9ben a monokult\u00fara hi\u00e1nya \u00e9s a konszenzusra \u00e9p\u00fcl\u0151 szabv\u00e1nyok ir\u00e1nti elk\u00f6telezetts\u00e9g, ahelyett, hogy egyed\u00fcli ir\u00e1ny\u00edt\u00e1ssal rendelkezn\u00e9nk, \u00f6szt\u00f6nzi az alkalmaz\u00e1sfejleszt\u0151ket a szabv\u00e1nyok haszn\u00e1lat\u00e1ra, nem pedig konkr\u00e9t implement\u00e1ci\u00f3khoz val\u00f3 k\u00f6t\u0151d\u00e9sre. Ez\u00e9rt musl szerz\u0151je ellene van k\u00f6nyvt\u00e1r\u00e1nak az LLVM-be val\u00f3 beilleszt\u00e9s\u00e9nek, ahogyan az LLVM keretein bel\u00fcl a libc fejleszt\u00e9s\u00e9nek is, mivel \u00edgy elveszne a libc f\u00fcggetlen jellege, \u00e9s egy adott implement\u00e1ci\u00f3 els\u0151 oszt\u00e1ly\u00fa megold\u00e1ss\u00e1 v\u00e1lna az LLVM sz\u00e1m\u00e1ra, m\u00edg a t\u00f6bbi m\u00e1sodlagoss\u00e1.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50970\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u043e\u0434\u043d\u044f\u043b \u0432 \u0441\u043f\u0438\u0441\u043a\u0435 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0438 LLVM \u0442\u0435\u043c\u0443 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043c\u043d\u043e\u0433\u043e\u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0435\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 (Libc) \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 LLVM. \u041f\u043e \u0440\u044f\u0434\u0443 \u043f\u0440\u0438\u0447\u0438\u043d Google \u043d\u0435 \u0443\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u044e\u0442 \u0442\u0435\u043a\u0443\u0449\u0438\u0435 libc (glibc, musl) \u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u044f \u043d\u0430 \u043f\u0443\u0442\u0438 \u043a \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043d\u043e\u0432\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0442\u044c \u043a\u0430\u043a \u0447\u0430\u0441\u0442\u044c LLVM. \u041d\u0430\u0440\u0430\u0431\u043e\u0442\u043a\u0438 LLVM \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0441\u043d\u043e\u0432\u044b \u0434\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f [&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-35694","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u043e\u0434\u043d\u044f\u043b \u0432 \u0441\u043f\u0438\u0441\u043a\u0435 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0438 LLVM \u0442\u0435\u043c\u0443 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 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