{"id":41014,"date":"2020-02-05T10:07:45","date_gmt":"2020-02-05T07:07:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/vypusk-sistemnoj-biblioteki-glibc-2-31"},"modified":"2020-02-05T10:07:45","modified_gmt":"2020-02-05T07:07:45","slug":"vypusk-sistemnoj-biblioteki-glibc-2-31","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/vypusk-sistemnoj-biblioteki-glibc-2-31","title":{"rendered":"Lan\u00e7amento da biblioteca de sistema Glibc 2.31","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ap\u00f3s seis meses de desenvolvimento <noindex><a rel=\"nofollow\" href=\"https:\/\/sourceware.org\/ml\/libc-alpha\/2020-02\/msg00010.html\">foi publicado<\/a><\/noindex> lan\u00e7amento da biblioteca do sistema <noindex><a rel=\"nofollow\" href=\"http:\/\/ftp.gnu.org\/gnu\/glibc\/\">GNU C Library<\/a><\/noindex> (glibc) <noindex><a rel=\"nofollow\" href=\"http:\/\/sourceware.org\/glibc\/wiki\/Release\/2.31\">2.31<\/a><\/noindex>, que atende completamente aos requisitos das normas ISO C11 e POSIX.1-2008. A nova vers\u00e3o inclui corre\u00e7\u00f5es de 58 desenvolvedores. <\/p>\n<p>Implementadas no Glibc 2.31 <noindex><a rel=\"nofollow\" href=\"http:\/\/sourceware.org\/git\/?p=glibc.git;a=blob_plain;f=NEWS;hb=HEAD\">melhorias<\/a><\/noindex> pode-se destacar:\n<\/p>\n<ul>\n<li class=\"l\"> Adicionado o macro _ISOC2X_SOURCE para incluir capacidades definidas no rascunho do futuro padr\u00e3o ISO <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/C2x\">C2X<\/a><\/noindex>. Essas funcionalidades tamb\u00e9m s\u00e3o ativadas ao usar o macro _GNU_SOURCE ou ao compilar com gcc usando a flag &#171;-std=gnu2x&#187;;\n<li class=\"l\"> Para determinadas fun\u00e7\u00f5es no arquivo de cabe\u00e7alho &#171;math.h&#187; que arredondam seus resultados para um tipo menor, o arquivo &#171;tgmath.h&#187; prop\u00f5e os macros correspondentes de tipo gen\u00e9rico, conforme requerem as especifica\u00e7\u00f5es TS 18661-1:2014 e TS 18661-3:2015;\n<li class=\"l\"> Adicionada a fun\u00e7\u00e3o pthread_clockjoin_np(), que aguarda a conclus\u00e3o da thread considerando o timeout (se o timeout ocorrer antes da conclus\u00e3o, a fun\u00e7\u00e3o retornar\u00e1 um erro). Ao contr\u00e1rio de <noindex><a rel=\"nofollow\" href=\"https:\/\/linux.die.net\/man\/3\/pthread_timedjoin_np\">pthread_timedjoin_np()<\/a><\/noindex>, em pthread_clockjoin_np() \u00e9 permitido definir o tipo de timer para calcular o tempo limite \u2014 CLOCK_MONOTONIC (que considera o tempo que o sistema passou em modo de suspens\u00e3o) ou CLOCK_REALTIME;\n<li class=\"l\"> O resolutor DNS agora suporta a op\u00e7\u00e3o trust-ad em \/etc\/resolv.conf e a flag RES_TRUSTAD em _res.options, nas quais, se ativadas, os pedidos DNS incluir\u00e3o a flag DNSSEC <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc3655\">AD<\/a><\/noindex> (dados autenticados). Nesse modo, a flag AD definida pelo servidor fica dispon\u00edvel para aplicativos que chamam fun\u00e7\u00f5es como res_search(). Por padr\u00e3o, se as op\u00e7\u00f5es apresentadas n\u00e3o forem ativadas, a glibc n\u00e3o marca a flag AD nas solicita\u00e7\u00f5es e a limpa automaticamente nas respostas, indicando a aus\u00eancia de verifica\u00e7\u00e3o DNSSEC;\n<li class=\"l\"> Para compilar bindings de chamadas de sistema para Glibc, n\u00e3o \u00e9 mais necess\u00e1rio instalar os arquivos de cabe\u00e7alho do kernel Linux. A exce\u00e7\u00e3o \u00e9 a arquitetura RISC-V de 64 bits;\n<li class=\"l\"> Eliminada <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=CVE-2019-19126\">uma vulnerabilidade<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-19126\">CVE-2019-19126<\/a><\/noindex>, que permite contornar a prote\u00e7\u00e3o<br \/>\nASLR em programas com flag setuid e determinar o layout de endere\u00e7os em bibliotecas carregadas atrav\u00e9s da manipula\u00e7\u00e3o da vari\u00e1vel de ambiente LD_PREFER_MAP_32BIT_EXEC.<\/p>\n<\/ul>\n<p> Mudan\u00e7as que quebram compatibilidade:<\/p>\n<ul>\n<li class=\"l\"> Em totalorder(), totalordermag() e fun\u00e7\u00f5es similares para outros tipos de ponto flutuante agora aceitam como argumento ponteiros para evitar avisos de convers\u00e3o de valores em estado <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/NaN\">NaN<\/a><\/noindex>, conforme recomendado pela TS 18661-1, proposta para o futuro padr\u00e3o C2X.<br \/>\nOs arquivos execut\u00e1veis existentes, nos quais argumentos de ponto flutuante s\u00e3o passados diretamente, continuar\u00e3o funcionando sem altera\u00e7\u00e3o;<\/p>\n<li class=\"l\"> A fun\u00e7\u00e3o obsoleta stime, h\u00e1 muito anunciada, agora n\u00e3o est\u00e1 dispon\u00edvel para arquivos bin\u00e1rios vinculados ao glibc, e sua defini\u00e7\u00e3o foi removida de time.h. Para definir o hor\u00e1rio do sistema, deve-se usar a fun\u00e7\u00e3o clock_settime. No futuro, planeja-se remover tamb\u00e9m a fun\u00e7\u00e3o ftime, que foi marcada como obsoleta, assim como o arquivo de cabe\u00e7alho sys\/timeb.h (em vez de ftime, deve-se usar gettimeofday ou clock_gettime);\n<li class=\"l\"> A fun\u00e7\u00e3o gettimeofday n\u00e3o transmite mais informa\u00e7\u00f5es sobre o fuso hor\u00e1rio do sistema (esta funcionalidade era v\u00e1lida na \u00e9poca do 4.2-BSD e foi declarada obsoleta h\u00e1 muitos anos). O argumento &#8216;tzp&#8217; agora deve receber um ponteiro nulo, e para obter informa\u00e7\u00f5es sobre o fuso hor\u00e1rio em rela\u00e7\u00e3o ao tempo atual deve-se usar a fun\u00e7\u00e3o localtime(). Ao chamar gettimeofday com um argumento &#8216;tzp&#8217; n\u00e3o nulo, os campos tz_minuteswest e tz_dsttime na estrutura timezone ser\u00e3o retornados vazios. A pr\u00f3pria fun\u00e7\u00e3o gettimeofday \u00e9 considerada obsoleta no POSIX (em vez de gettimeofday, recomenda-se usar clock_gettime), mas n\u00e3o est\u00e1 planejado remov\u00ea-la do glibc;\n<li class=\"l\"> No settimeofday, o suporte para a transmiss\u00e3o simult\u00e2nea de par\u00e2metros para definir o hor\u00e1rio e a corre\u00e7\u00e3o do deslocamento de hor\u00e1rio foi interrompido. Ao chamar settimeofday, um dos argumentos (hor\u00e1rio ou deslocamento) agora deve obrigatoriamente ser definido como nulo, caso contr\u00e1rio, a chamada da fun\u00e7\u00e3o resultar\u00e1 em erro EINVAL. Assim como gettimeofday, a fun\u00e7\u00e3o settimeofday \u00e9 considerada obsoleta no POSIX e recomenda-se usar a fun\u00e7\u00e3o clock_settime ou a fam\u00edlia de fun\u00e7\u00f5es adjtime;\n<li class=\"l\"> O suporte para a arquitetura SPARC ISA v7 foi interrompido (o suporte ao v8 \u00e9 mantido, mas somente para processadores que suportam instru\u00e7\u00f5es CAS, como os processadores LEON, mas n\u00e3o os processadores SuperSPARC).\n<li class=\"l\"> Em caso de falha de link no modo &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/docs.oracle.com\/cd\/E23824_01\/html\/819-0690\/chapter3-7.html\">lazy<\/a><\/noindex>&#171;, em que o vinculador n\u00e3o procura por s\u00edmbolos de fun\u00e7\u00e3o at\u00e9 a primeira chamada dessa fun\u00e7\u00e3o, a fun\u00e7\u00e3o dlopen agora finaliza o processo for\u00e7adamente (anteriormente, em caso de falha, retornava NULL);\n<li class=\"l\"> Para ABI MIPS hard-float, agora \u00e9 usado um stack execut\u00e1vel, a menos que um limite de uso do n\u00facleo Linux 4.8+ seja explicitamente definido durante a compila\u00e7\u00e3o atrav\u00e9s do par\u00e2metro &#171;&#8212;enable-kernel=4.8.0&#187; (com n\u00facleos at\u00e9 4.8, falhas ocorrem em algumas configura\u00e7\u00f5es MIPS);\n<li class=\"l\"> As liga\u00e7\u00f5es sobre chamadas de sistema relacionadas \u00e0 manipula\u00e7\u00e3o de tempo foram adaptadas para usar a chamada de sistema time64, quando dispon\u00edvel (em sistemas de 32 bits, a glibc tenta primeiro usar as novas chamadas de sistema que manipulam o tipo de tempo de 64 bits e, se n\u00e3o houver, recua para as antigas chamadas de 32 bits).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52293\">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) 2.31, \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.1-2008. \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 58 \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 2.31 \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u0439 \u043c\u043e\u0436\u043d\u043e \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d \u043c\u0430\u043a\u0440\u043e\u0441 _ISOC2X_SOURCE \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439, \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0432 \u0447\u0435\u0440\u043d\u043e\u0432\u043e\u043c \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0435 \u0431\u0443\u0434\u0443\u0449\u0435\u0433\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0430 ISO C2X. \u0414\u0430\u043d\u043d\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 [&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":[],"tags":[],"class_list":["post-41014","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link 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