{"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\/it\/blog\/novosti-interneta\/vypusk-sistemnoj-biblioteki-glibc-2-34","title":{"rendered":"Pubblicazione della libreria di sistema Glibc 2.34","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo sei mesi di sviluppo, \u00e8 stato pubblicato il rilascio della GNU C Library (glibc) 2.34, che risponde pienamente ai requisiti degli standard ISO C11 e POSIX.1-2017. La nuova versione include correzioni da parte di 66 sviluppatori.     <\/p>\n<p>Tra i miglioramenti apportati in Glibc 2.34 si possono annoverare:   <\/p>\n<ul>\n<li class=\"l\"> Le librerie libpthread, libdl, libutil e libanl sono state integrate nella libreria principale libc, il che significa che l'uso delle loro funzionalit\u00e0 nelle applicazioni non richiede pi\u00f9 il collegamento tramite i flag -lpthread, -ldl, -lutil e -lanl. \u00c8 stata avviata la preparazione per l'integrazione di libresolv in libc. Questa integrazione permetter\u00e0 di ottenere un processo di aggiornamento pi\u00f9 coerente di glibc e semplificher\u00e0 l'implementazione del runtime. Per garantire la compatibilit\u00e0 con le applicazioni compilate con versioni precedenti di glibc, sono state fornite librerie stub. A causa dell'aumento del numero di strutture e funzioni disponibili in glibc, potrebbero sorgere problemi nelle applicazioni in cui si verifica un'overlap di nomi con le librerie libpthread, libdl, libutil, libresolv e libanl non precedentemente utilizzate.\n<li class=\"l\"> \u00c8 stata introdotta la possibilit\u00e0 di utilizzare il tipo time_t a 64 bit nelle configurazioni in cui tradizionalmente veniva utilizzato il tipo time_t a 32 bit. In tali configurazioni, ad esempio nei sistemi x86, per impostazione predefinita resta momentaneamente il time_t a 32 bit, ma questo comportamento pu\u00f2 ora essere modificato tramite il macro \u00ab_TIME_BITS\u00bb. Questa funzionalit\u00e0 \u00e8 disponibile solo su sistemi con kernel Linux almeno della versione 5.1.\n<li class=\"l\"> \u00c8 stata aggiunta la funzione _Fork, che sostituisce la funzione fork, rispettando i requisiti di \u00abasync-signal-safe\u00bb, ovvero consentendo chiamate sicure dai gestori di segnali. Durante l'esecuzione di _Fork, viene creato un ambiente minimo, sufficiente per chiamare funzioni nei gestori di segnali, come raise ed execve, senza utilizzare funzionalit\u00e0 che possano causare modifiche ai lock o allo stato interno. La chiamata a _Fork sar\u00e0 definita in una futura versione dello standard POSIX, ma per ora \u00e8 inclusa tra le estensioni GNU.\n<li class=\"l\"> Per la piattaforma Linux \u00e8 stata implementata la funzione execveat, che consente di eseguire un file eseguibile a partire da un descrittore di file aperto. La nuova funzione \u00e8 utilizzata anche nell'implementazione della chiamata fexecve, che non richiede un filesystem pseudo-montato \/proc al momento dell'avvio.\n<li class=\"l\"> \u00c8 stata aggiunta la funzione timespec_getres, definita nella bozza dello standard ISO C2X, che amplia la funzione timespec_get con capacit\u00e0 simili a quelle della funzione POSIX clock_getres.\n<li class=\"l\"> \u00c8 stata aggiunta la funzione close_range(), che consente al processo di chiudere simultaneamente un intero intervallo di descrittori di file aperti. La funzione \u00e8 disponibile sui sistemi con kernel Linux, versione 5.9 o superiore.\n<li class=\"l\"> Sono state aggiunte le funzioni closefrom e posix_spawn_file_actions_addclosefrom_np, che consentono di chiudere simultaneamente tutti i descrittori di file il cui numero \u00e8 maggiore o uguale al valore specificato.\n<li class=\"l\"> Nei modi \u00ab_DYNAMIC_STACK_SIZE_SOURCE\u00bb e \u00ab_GNU_SOURCE\u00bb, i valori PTHREAD_STACK_MIN, MINSIGSTKSZ e SIGSTKSZ non sono pi\u00f9 costanti, consentendo quindi il supporto di set di registri di dimensioni dinamiche, ad esempio forniti dall'estensione ARM SVE.\n<li class=\"l\"> Nel linker \u00e8 stata implementata l'opzione \u00ab--list-diagnostics\u00bb per visualizzare informazioni relative alle operazioni di definizione IFUNC (funzione indiretta) e alla scelta del sottodirectory glibc-hwcaps.\n<li class=\"l\"> \u00c8 stato implementato il macro __STDC_WANT_IEC_60559_EXT__, destinato a verificare la presenza di funzioni definite nell'applicazione \u00abF\u00bb della specifica ISO C2X.\n<li class=\"l\"> Per i sistemi powerpc64*, \u00e8 stata implementata l'opzione \u00ab--disable-scv\u00bb, che consente di compilare glibc senza supporto per l'istruzione scv.\n<li class=\"l\"> Nel file gconv-modules \u00e8 rimasto solo un insieme minimo di moduli gconv di base, mentre gli altri sono stati spostati in un file aggiuntivo gconv-modules-extra.conf, situato nella directory gconv-modules.d.\n<li class=\"l\"> Per la piattaforma Linux \u00e8 stato implementato il parametro glibc.pthread.stack_cache_size, che pu\u00f2 essere utilizzato per configurare la dimensione della cache dello stack pthread.\n<li class=\"l\"> La funzione inet_neta del file di intestazione  \u00e8 stata dichiarata obsoleta, insieme a diverse funzioni raramente utilizzate da  (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) e  (ns_datetosecs, ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename, ns_sprintrr, ns_sprintrrf, ns_subdomain). Si raccomanda di utilizzare librerie separate per lavorare con DNS.\n<li class=\"l\"> Le funzioni pthread_mutex_consistent_np, thread_mutexattr_getrobust_np, pthread_mutexattr_setrobust_np e pthread_yield sono state dichiarate obsolete e dovrebbero essere sostituite da pthread_mutex_consistent, thread_mutexattr_getrobust, pthread_mutexattr_setrobust e sched_yield.\n<li class=\"l\"> L'uso dei collegamenti simbolici per legare oggetti condivisi installati alla versione di Glibc \u00e8 stato interrotto. Tali oggetti ora vengono installati come sono (ad esempio, libc.so.6 \u00e8 ora un file e non un collegamento a libc-2.34.so).\n<li class=\"l\"> Per impostazione predefinita, le funzioni di debug in malloc, come MALLOC_CHECK_ (glibc.malloc.check), mtrace() e mcheck(), sono disabilitate e spostate in una libreria separata libc_malloc_debug.so, in cui sono state inoltre trasferite le funzioni obsolete malloc_get_state e malloc_set_state.\n<li class=\"l\"> In Linux, per il funzionamento di funzioni come shm_open e sem_open, ora \u00e8 necessario avere il dispositivo \/dev\/shm.\n<li class=\"l\"> Vulnerabilit\u00e0 risolte:\n<ul>\n<li class=\"l\"> CVE-2021-27645: il crash del processo nscd (daemon di caching del nameserver) dovuto a una doppia chiamata alla funzione free durante l'elaborazione di richieste netgroup appositamente formattate.\n<li class=\"l\"> CVE-2021-33574: accesso a un'area di memoria gi\u00e0 liberata (use-after-free) nella funzione mq_notify quando si utilizza il tipo di notifica SIGEV_THREAD con l'attributo thread, per il quale \u00e8 stata impostata una maschera alternativa di binding alla CPU. Il problema pu\u00f2 portare a un crash, ma non si escludono altre modalit\u00e0 di attacco.\n<li class=\"l\"> CVE-2021-35942: un overflow della dimensione del parametro nella funzione wordexp pu\u00f2 causare un crash dell'applicazione.    <\/ul>\n<\/ul>\n<p>Fonte: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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sei mesi di sviluppo, \u00e8 stato pubblicato il rilascio della libreria di sistema GNU C Library (glibc) 2.34, che soddisfa pienamente i requisiti degli standard ISO C11 e POSIX.1-2017. Il nuovo rilascio include correzioni da 66 sviluppatori. Tra i miglioramenti implementati in Glibc 2.34 si segnala: le librerie libpthread, libdl, libutil e libanl sono state integrate nel nucleo di libc, la cui funzionalit\u00e0 pu\u00f2 essere utilizzata nelle applicazioni.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-sistemnoj-biblioteki-glibc-2-34","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412\u044b\u043f\u0443\u0441\u043a \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 Glibc 2.34 | 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