{"id":100888,"date":"2021-08-02T10:22:56","date_gmt":"2021-08-02T08:22:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-sistemnoj-biblioteki-glibc-2-34"},"modified":"2021-08-02T10:22:56","modified_gmt":"2021-08-02T08:22:56","slug":"vypusk-sistemnoj-biblioteki-glibc-2-34","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-sistemnoj-biblioteki-glibc-2-34","title":{"rendered":"Megjelent a Glibc 2.34 rendszerk\u00f6nyvt\u00e1r.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Hat h\u00f3napnyi fejleszt\u00e9s ut\u00e1n megjelent a GNU C Library (glibc) 2.34 rendszerk\u00f6nyvt\u00e1r \u00faj kiad\u00e1sa, amely teljes m\u00e9rt\u00e9kben megfelel az ISO C11 \u00e9s POSIX.1-2017 szabv\u00e1nyok k\u00f6vetelm\u00e9nyeinek. Az \u00faj kiad\u00e1s tartalmaz jav\u00edt\u00e1sokat 66 fejleszt\u0151t\u0151l.     <\/p>\n<p>A Glibc 2.34-ben megval\u00f3s\u00edtott fejleszt\u00e9sek k\u00f6z\u00fcl kiemelhet\u0151:   <\/p>\n<ul>\n<li class=\"l\"> A libc alapj\u00e1ba integr\u00e1lt\u00e1k a libpthread, libdl, libutil \u00e9s libanl k\u00f6nyvt\u00e1rakat, \u00edgy ezek alkalmaz\u00e1sokban val\u00f3 haszn\u00e1lata ezent\u00fal nem ig\u00e9nyli a -lpthread, -ldl, -lutil \u00e9s -lanl flag-ek haszn\u00e1lat\u00e1t. Elk\u00e9sz\u00edtett\u00e9k a libresolv libc-be val\u00f3 integr\u00e1l\u00e1s\u00e1nak el\u0151k\u00e9sz\u00edt\u00e9s\u00e9t. Az integr\u00e1ci\u00f3 lehet\u0151v\u00e9 teszi a glibc friss\u00edt\u00e9si folyamat\u00e1nak egys\u00e9gesebb v\u00e9grehajt\u00e1s\u00e1t \u00e9s egyszer\u0171s\u00edti a fut\u00e1si id\u0151 megval\u00f3s\u00edt\u00e1s\u00e1t. A r\u00e9gi glibc verzi\u00f3kkal \u00f6sszegy\u0171jt\u00f6tt alkalmaz\u00e1sokkal val\u00f3 visszamen\u0151leges kompatibilit\u00e1s biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben heurisztikus k\u00f6nyvt\u00e1rak \u00e1llnak rendelkez\u00e9sre. A glibc strukt\u00far\u00e1k \u00e9s funkci\u00f3k sz\u00e1m\u00e1nak b\u0151v\u00edt\u00e9se miatt elk\u00e9pzelhet\u0151, hogy probl\u00e9m\u00e1k mer\u00fclnek fel azokban az alkalmaz\u00e1sokban, amelyek n\u00e9v\u00fctk\u00f6z\u00e9st mutatnak az eddig m\u00e9g nem haszn\u00e1lt libpthread, libdl, libutil, libresolv \u00e9s libanl k\u00f6nyvt\u00e1rakkal.\n<li class=\"l\"> Lehet\u0151s\u00e9g ny\u00edlt a 64 bites time_t t\u00edpus haszn\u00e1lat\u00e1ra olyan konfigur\u00e1ci\u00f3kban, ahol kor\u00e1bban a 32 bites time_t t\u00edpust haszn\u00e1lt\u00e1k. Az ilyen konfigur\u00e1ci\u00f3kban, p\u00e9ld\u00e1ul az x86 rendszereken, alap\u00e9rtelmez\u00e9s szerint m\u00e9g mindig a 32 bites time_t marad, de ez a viselked\u00e9s mostant\u00f3l megv\u00e1ltoztathat\u00f3 a \u201e_TIME_BITS\u201d makr\u00f3 seg\u00edts\u00e9g\u00e9vel. Ez a lehet\u0151s\u00e9g csak olyan rendszereken \u00e9rhet\u0151 el, ahol a Linux kernel legal\u00e1bb 5.1-es verzi\u00f3val rendelkezik.\n<li class=\"l\"> Hozz\u00e1adva a _Fork f\u00fcggv\u00e9ny, amely a fork f\u00fcggv\u00e9ny helyettes\u00edt\u00e9s\u00e9re szolg\u00e1l, megfelelve az \u201easync-signal-safe\u201d k\u00f6vetelm\u00e9nyeinek, azaz lehet\u0151v\u00e9 t\u00e9ve a biztons\u00e1gos h\u00edv\u00e1st jelz\u00e9sek kezel\u0151ib\u0151l. A _Fork v\u00e9grehajt\u00e1sa sor\u00e1n minim\u00e1lis k\u00f6rnyezet j\u00f6n l\u00e9tre, amely elegend\u0151 a jelz\u0151k kezel\u0151iben v\u00e9grehajtand\u00f3 f\u00fcggv\u00e9nyek, mint p\u00e9ld\u00e1ul a raise \u00e9s execve h\u00edv\u00e1s\u00e1hoz, an\u00e9lk\u00fcl, hogy olyan lehet\u0151s\u00e9geket haszn\u00e1ln\u00e1nk, amelyek z\u00e1rol\u00e1sok vagy bels\u0151 \u00e1llapotok megv\u00e1ltoz\u00e1s\u00e1hoz vezethetnek. A _Fork h\u00edv\u00e1s\u00e1t a POSIX szabv\u00e1ny j\u00f6v\u0151beli verzi\u00f3j\u00e1ban defini\u00e1lj\u00e1k, de jelenleg a GNU kiterjeszt\u00e9sek k\u00f6z\u00e9 tartozik.\n<li class=\"l\"> Linux platformra megval\u00f3s\u00edtott\u00e1k az execveat f\u00fcggv\u00e9nyt, amely lehet\u0151v\u00e9 teszi egy v\u00e9grehajthat\u00f3 f\u00e1jl ind\u00edt\u00e1s\u00e1t egy nyitott f\u00e1jldeszkriptorb\u00f3l. Az \u00faj funkci\u00f3t az fexecve h\u00edv\u00e1s megval\u00f3s\u00edt\u00e1s\u00e1ban is haszn\u00e1lj\u00e1k, amely nem ig\u00e9nyli a \/proc \u00e1lv\u00e1ltozat\u00e1nak bekapcsol\u00e1s\u00e1t a futtat\u00e1s sor\u00e1n.\n<li class=\"l\"> Hozz\u00e1adva a timespec_getres f\u00fcggv\u00e9ny, amely az ISO C2X szabv\u00e1ny tervezet\u00e9ben van meghat\u00e1rozva, \u00e9s kieg\u00e9sz\u00edti a timespec_get f\u00fcggv\u00e9nyt a POSIX clock_getres f\u00fcggv\u00e9nyhez hasonl\u00f3 lehet\u0151s\u00e9gekkel.\n<li class=\"l\"> Hozz\u00e1adva a close_range() f\u00fcggv\u00e9ny, amely lehet\u0151v\u00e9 teszi a folyamat sz\u00e1m\u00e1ra, hogy egyszerre bez\u00e1rjon egy teljes tartom\u00e1nyt a megnyitott f\u00e1jlle\u00edr\u00f3kb\u00f3l. Ez a f\u00fcggv\u00e9ny el\u00e9rhet\u0151 a legal\u00e1bb 5.9-es Linux kernel verzi\u00f3j\u00fa rendszereken.\n<li class=\"l\"> Hozz\u00e1adva a closefrom \u00e9s a posix_spawn_file_actions_addclosefrom_np f\u00fcggv\u00e9nyek, amelyek lehet\u0151v\u00e9 teszik, hogy egyszerre bez\u00e1rj\u00e1k az \u00f6sszes f\u00e1jlle\u00edr\u00f3t, amelynek sz\u00e1ma nagyobb vagy egyenl\u0151 a megadott \u00e9rt\u00e9kkel.\n<li class=\"l\"> A \u201e_DYNAMIC_STACK_SIZE_SOURCE\u201d \u00e9s a \u201e_GNU_SOURCE\u201d m\u00f3dokban a PTHREAD_STACK_MIN, MINSIGSTKSZ \u00e9s SIGSTKSZ \u00e9rt\u00e9kek m\u00e1r nem \u00e1lland\u00f3k, ami lehet\u0151v\u00e9 teszi a dinamikus m\u00e9ret\u0171 regisztered\u00e9nyek t\u00e1mogat\u00e1s\u00e1t, p\u00e9ld\u00e1ul az ARM SVE kiterjeszt\u00e9s \u00e1ltal biztos\u00edtottakat.\n<li class=\"l\"> A linkerben megval\u00f3s\u00edtva lett a \u201e--list-diagnostics\u201d opci\u00f3, amely inform\u00e1ci\u00f3t ny\u00fajt az IFUNC (indirekt f\u00fcggv\u00e9ny) meghat\u00e1roz\u00e1s\u00e1val \u00e9s a glibc-hwcaps almappa kiv\u00e1laszt\u00e1s\u00e1val kapcsolatos m\u0171veletekr\u0151l.\n<li class=\"l\"> Megval\u00f3s\u00edtva lett a __STDC_WANT_IEC_60559_EXT__ makr\u00f3, amely a ISO C2X specifik\u00e1ci\u00f3 \u201eF\u201d alkalmaz\u00e1s\u00e1ban meghat\u00e1rozott f\u00fcggv\u00e9nyek el\u00e9rhet\u0151s\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9re szolg\u00e1l.\n<li class=\"l\"> A powerpc64* rendszerek sz\u00e1m\u00e1ra megval\u00f3s\u00edtva lett a \u201e--disable-scv\u201d opci\u00f3, amely lehet\u0151v\u00e9 teszi a glibc \u00f6ssze\u00e1ll\u00edt\u00e1s\u00e1t an\u00e9lk\u00fcl, hogy t\u00e1mogatn\u00e1 az scv utas\u00edt\u00e1st.\n<li class=\"l\"> A gconv-modules f\u00e1jlban csak a gconv alap moduljainak minim\u00e1lis k\u00e9szlete maradt, a t\u00f6bbi \u00e1tker\u00fclt egy kieg\u00e9sz\u00edt\u0151 f\u00e1jlba, a gconv-modules-extra.conf-ba, amely a gconv-modules.d k\u00f6nyvt\u00e1rban tal\u00e1lhat\u00f3.\n<li class=\"l\"> Linux platformra bevezet\u00e9sre ker\u00fclt a glibc.pthread.stack_cache_size param\u00e9ter, amely a pthread stack cache m\u00e9ret\u00e9nek be\u00e1ll\u00edt\u00e1s\u00e1ra haszn\u00e1lhat\u00f3.\n<li class=\"l\"> Elavultk\u00e9nt bejelentve az inet_neta f\u00fcggv\u00e9ny az &lt;arpa\/inet.h&gt; fejl\u00e9cf\u00e1jlban, valamint k\u00fcl\u00f6nf\u00e9le ritk\u00e1n haszn\u00e1lt f\u00fcggv\u00e9nyek az &lt;resolv.h&gt;-b\u00f3l (dn_count_labels, fp_nquery, fp_query, fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname, p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time, p_type, putlong, putshort, res_hostalias, res_isourserver, res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos, sym_ston) \u00e9s az &lt;arpa\/nameser.h&gt;-b\u00f3l (ns_datetosecs, ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename, ns_sprintrr, ns_sprintrrf, ns_subdomain). Ezek helyett javasolt a DNS kezel\u00e9s\u00e9re k\u00fcl\u00f6n\u00e1ll\u00f3 k\u00f6nyvt\u00e1rak haszn\u00e1lata.\n<li class=\"l\"> Elavultk\u00e9nt bejelentett\u00e9k a pthread_mutex_consistent_np, thread_mutexattr_getrobust_np, pthread_mutexattr_setrobust_np \u00e9s pthread_yield f\u00fcggv\u00e9nyeket, helyett\u00fck a pthread_mutex_consistent, thread_mutexattr_getrobust, thread_mutexattr_setrobust \u00e9s sched_yield haszn\u00e1lata aj\u00e1nlott.\n<li class=\"l\"> A szimbolikus linkek haszn\u00e1lata megsz\u0171nt a megosztott objektumok Glibc verzi\u00f3hoz val\u00f3 k\u00f6t\u00e9s\u00e9re. Az ilyen objektumokat most m\u00e1r t\u00e9nyleges f\u00e1jlk\u00e9nt telep\u00edtik (p\u00e9ld\u00e1ul a libc.so.6 most f\u00e1jl, nem pedig hivatkoz\u00e1s a libc-2.34.so-ra).\n<li class=\"l\"> Alap\u00e9rtelmez\u00e9s szerint a malloc hibakeres\u00e9si lehet\u0151s\u00e9gei, mint a MALLOC_CHECK_ (glibc.malloc.check), mtrace() \u00e9s mcheck() le vannak tiltva, \u00e9s egy k\u00fcl\u00f6n k\u00f6nyvt\u00e1rba, a libc_malloc_debug.so-ba ker\u00fcltek, ahova az elavult malloc_get_state \u00e9s malloc_set_state f\u00fcggv\u00e9nyek is \u00e1tker\u00fcltek.\n<li class=\"l\"> Linux alatt a shm_open \u00e9s sem_open f\u00fcggv\u00e9nyek haszn\u00e1lat\u00e1hoz most m\u00e1r sz\u00fcks\u00e9ges a \/dev\/shm eszk\u00f6z megl\u00e9te.\n<li class=\"l\"> Sebezhet\u0151s\u00e9gek kik\u00fcsz\u00f6b\u00f6lve:\n<ul>\n<li class=\"l\"> CVE-2021-27645: a nscd (nameserver caching daemon) folyamat \u00f6sszeoml\u00e1sa a free f\u00fcggv\u00e9ny dupla h\u00edv\u00e1sa miatt, amikor speci\u00e1lis form\u00e1tum\u00fa netgroup-k\u00e9r\u00e9seket kezel.\n<li class=\"l\"> CVE-2021-33574: m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fclethez val\u00f3 hozz\u00e1f\u00e9r\u00e9s (use-after-free) a mq_notify f\u00fcggv\u00e9nyben, amikor a SIGEV_THREAD \u00e9rtes\u00edt\u00e9si t\u00edpust haszn\u00e1lj\u00e1k egy olyan sz\u00e1ll\u00edt\u00f3ra, amelyhez alternat\u00edv CPU lek\u00f6t\u00e9si maszk van be\u00e1ll\u00edtva. A probl\u00e9ma \u00f6sszeoml\u00e1st okozhat, de m\u00e1s t\u00e1mad\u00e1si lehet\u0151s\u00e9gek is fenn\u00e1llnak.\n<li class=\"l\"> CVE-2021-35942: a wordexp f\u00fcggv\u00e9ny param\u00e9ter\u00e9nek m\u00e9ret\u00e9nek t\u00falcsordul\u00e1sa alkalmaz\u00e1s\u00f6sszeoml\u00e1shoz vezethet.    <\/ul>\n<\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55575\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\u0442\u0438 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 GNU C Library (glibc) 2.34, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u044f\u043c \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043e\u0432 ISO C11 \u0438 POSIX.1-2017. \u0412 \u0441\u043e\u0441\u0442\u0430\u0432 \u043d\u043e\u0432\u043e\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u044b \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u0442 66 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432. \u0418\u0437 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0432 Glibc 2.34 \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u0439 \u043c\u043e\u0436\u043d\u043e \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c: \u0412 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0441\u043e\u0441\u0442\u0430\u0432 libc \u0438\u043d\u0442\u0435\u0433\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 libpthread, libdl, libutil \u0438 libanl, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445 [&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-100888","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\" 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