{"id":76724,"date":"2020-04-04T07:42:13","date_gmt":"2020-04-04T05:42:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kompaniya-oracle-opublikovala-yadro-unbreakable-enterprise-kernel-6"},"modified":"2020-04-04T07:42:13","modified_gmt":"2020-04-04T05:42:13","slug":"kompaniya-oracle-opublikovala-yadro-unbreakable-enterprise-kernel-6","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/kompaniya-oracle-opublikovala-yadro-unbreakable-enterprise-kernel-6","title":{"rendered":"Spolo\u010dnos\u0165 Oracle vydala Unbreakable Enterprise Kernel 6","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Spolo\u010dnos\u0165 Oracle <noindex><a rel=\"nofollow\" href=\"https:\/\/blogs.oracle.com\/linux\/announcing-the-unbreakable-enterprise-kernel-release-6-for-oracle-linux\">predstavila<\/a><\/noindex> prv\u00e1 stabiln\u00e1 verzia <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.oracle.com\/en\/operating-systems\/uek\/6\/relnotes6.0\/\">Unbreakable Enterprise Kernel 6<\/a><\/noindex> (UEK R6), roz\u0161\u00edren\u00e1 verzia jadra Linuxu, ktor\u00e1 je ur\u010den\u00e1 na pou\u017eitie v distrib\u00facii Oracle Linux ako alternat\u00edva k \u0161tandardn\u00e9mu bal\u00edku jadra z Red Hat Enterprise Linux. Jadro je dostupn\u00e9 iba pre architekt\u00fary x86_64 a ARM64 (aarch64). Zdrojov\u00e9 k\u00f3dy jadra, vr\u00e1tane rozdelenia na samostatn\u00e9 opravy, <noindex><a rel=\"nofollow\" href=\"https:\/\/oss.oracle.com\/git\/?p=linux-uek.git;a=summary\">boli publikovan\u00e9<\/a><\/noindex> s\u00fa verejne dostupn\u00e9 v Git repozit\u00e1ri Oracle.<\/p>\n<p>Bal\u00edk Unbreakable Enterprise Kernel 6 je zalo\u017een\u00fd na jadre <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51881\">Linux 5.4<\/a><\/noindex> (UEK R5 bol zalo\u017een\u00fd na jadre 4.14), ktor\u00e9 je doplnen\u00e9 o nov\u00e9 funkcie, optimaliz\u00e1cie a opravy, a z\u00e1rove\u0148 bolo overen\u00e9 na kompatibilitu s v\u00e4\u010d\u0161inou aplik\u00e1ci\u00ed funguj\u00facich na RHEL, a \u0161peci\u00e1lne optimalizovan\u00e9 pre priemyseln\u00fd softv\u00e9r a hardv\u00e9r Oracle. In\u0161tala\u010dn\u00e9 a src bal\u00edky jadra UEK R6 s\u00fa pripraven\u00e9 pre Oracle Linux <noindex><a rel=\"nofollow\" href=\"https:\/\/yum.oracle.com\/oracle-linux-7.html\">7.x<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/yum.oracle.com\/oracle-linux-8.html\">8.x<\/a><\/noindex>. Podpora vetvy 6.x bola ukon\u010den\u00e1, na aplik\u00e1ciu UEK R6 je potrebn\u00e9 aktualizova\u0165 syst\u00e9m na Oracle Linux 7 (neexistuj\u00fa \u017eiadne prek\u00e1\u017eky pre pou\u017e\u00edvanie tohto jadra v podobn\u00fdch verzi\u00e1ch RHEL, CentOS a Scientific Linux). <\/p>\n<p>K\u013e\u00fa\u010dov\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.oracle.com\/en\/operating-systems\/uek\/6\/relnotes6.0\/uek-features-changes.html\">novinky<\/a><\/noindex> Unbreakable Enterprise Kernel 6:<\/p>\n<ul>\n<li class=\"l\"> Roz\u0161\u00edren\u00e1 podpora syst\u00e9mov zalo\u017een\u00fdch na 64-bitovej architekt\u00fare ARM (aarch64).\n<li class=\"l\"> Zrealizovan\u00e1 podpora v\u0161etk\u00fdch funkci\u00ed Cgroup v2.\n<li class=\"l\"> Implementovan\u00fd r\u00e1mec ktask na paraleliz\u00e1ciu \u00faloh v jadre, ktor\u00e9 spotreb\u00favaj\u00fa zna\u010dn\u00e9 mno\u017estvo CPU. Napr\u00edklad, pomocou ktask je mo\u017en\u00e9 organizova\u0165 paraleliz\u00e1ciu oper\u00e1ci\u00ed \u010distenia rozsahov str\u00e1nok pam\u00e4te alebo spracovania zoznamu inode;\n<li class=\"l\"> Zahrnut\u00e1 paralelizovan\u00e1 verzia kswapd pre spracovanie oper\u00e1ci\u00ed v\u00fdmeny str\u00e1nok pam\u00e4te v asynchr\u00f3nnom re\u017eime, ktor\u00fd umo\u017e\u0148uje zn\u00ed\u017ei\u0165 po\u010det priamych (synchronn\u00fdch) oper\u00e1ci\u00ed v\u00fdmeny. Pri zni\u017eovan\u00ed po\u010dtu vo\u013en\u00fdch str\u00e1nok pam\u00e4te kswapd vykon\u00e1va skenovanie na identifik\u00e1ciu nepou\u017e\u00edvan\u00fdch str\u00e1nok, ktor\u00e9 m\u00f4\u017eu by\u0165 uvo\u013enen\u00e9.\n<li class=\"l\"> Podpora overovania integrity obrazu jadra a firmv\u00e9rov pod\u013ea digit\u00e1lneho podpisu pri na\u010d\u00edtan\u00ed jadra pomocou mechanizmu Kexec (na\u010d\u00edtanie jadra z u\u017e nahrat\u00e9ho syst\u00e9mu).\n<li class=\"l\"> Optimalizovan\u00fd v\u00fdkon syst\u00e9mu spr\u00e1vy virtu\u00e1lnej pam\u00e4te, zlep\u0161en\u00e1 efektivita \u010distenia str\u00e1nok pam\u00e4te a vyrovn\u00e1vacej pam\u00e4te, zlep\u0161en\u00e9 spracovanie po\u017eiadaviek na nepridelen\u00e9 str\u00e1nky pam\u00e4te (page faults).\n<li class=\"l\"> Roz\u0161\u00edren\u00e1 podpora NVDIMM, uveden\u00e1 trval\u00e1 pam\u00e4\u0165 teraz m\u00f4\u017ee by\u0165 pou\u017eit\u00e1 ako tradi\u010dn\u00e1 RAM.\n<li class=\"l\"> Bol prech\u00e1dza\u0165 na syst\u00e9m dynamick\u00e9ho ladenia DTrace 2.0, ktor\u00fd <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51287\">bol prelo\u017een\u00fd<\/a><\/noindex> na pou\u017e\u00edvanie subsyst\u00e9mu jadra eBPF. DTrace teraz funguje nad eBPF, podobne ako existuj\u00face n\u00e1stroje sledovania v Linuxe.\n<li class=\"l\"> Boli vykonan\u00e9 vylep\u0161enia v s\u00faborovom syst\u00e9me OCFS2 (Oracle Cluster File System).\n<li class=\"l\"> Vylep\u0161en\u00e1 podpora s\u00faborov\u00e9ho syst\u00e9mu Btrfs. Pridan\u00e1 mo\u017enos\u0165 pou\u017eitia Btrfs na kore\u0148ov\u00fdch oddieloch. Do in\u0161tal\u00e1tora bola pridan\u00e1 mo\u017enos\u0165 na v\u00fdber Btrfs pri form\u00e1tovan\u00ed zariaden\u00ed. Pridan\u00e9 mo\u017enosti umiestnenia v\u00fdmenn\u00fdch s\u00faborov na oddieloch s Btrfs. V Btrfs bola pridan\u00e1 podpora kompresie pomocou algoritmu ZStandard.\n<li class=\"l\"> Bola pridan\u00e1 podpora rozhrania pre asynchr\u00f3nny vstup\/v\u00fdstup \u2014 io_uring, ktor\u00e9 sa vyzna\u010duje podporou polingovania vstupu\/v\u00fdstupu a mo\u017enos\u0165ou pr\u00e1ce s bufferovan\u00edm aj bez neho. Z h\u013eadiska v\u00fdkonu je io_uring ve\u013emi bl\u00edzko k SPDK a podstatne prekon\u00e1va libaio pri pr\u00e1ci so zapnut\u00fdm polingom. Na pou\u017eitie io_uring v kone\u010dn\u00fdch aplik\u00e1ci\u00e1ch, ktor\u00e9 pracuj\u00fa v pou\u017e\u00edvate\u013eskom priestore, bola pripraven\u00e1 kni\u017enica liburing, ktor\u00e1 poskytuje vysok\u00fa \u00farove\u0148 obalu nad rozhran\u00edm jadra;\n<li class=\"l\"> Pridan\u00e1 podpora re\u017eimu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50123\">Adiantum<\/a><\/noindex> pre r\u00fdchlu \u0161ifrovanie \u00falo\u017en\u00fdch zariaden\u00ed.\n<li class=\"l\"> Pridan\u00e1 podpora kompresie pomocou algoritmu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=45058\">Zstandard<\/a><\/noindex> (zstd).\n<li class=\"l\"> V s\u00faborovom syst\u00e9me ext4 boli aktivovan\u00e9 64-bitov\u00e9 \u010dasov\u00e9 pe\u010diatky v poliach superbloku.\n<li class=\"l\"> V XFS s\u00fa zahrnut\u00e9 n\u00e1stroje na informovanie o stave integrity FS po\u010das prev\u00e1dzky a z\u00edskavanie statusu o vykon\u00e1van\u00ed fsck za behu.\n<li class=\"l\"> TCP z\u00e1sobn\u00edk je predvolen\u00fd prelo\u017een\u00fd na model \u201e<noindex><a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/766564\/\">Early Departure Time<\/a><\/noindex>\u201e namiesto \u201eTak r\u00fdchlo, ako je to mo\u017en\u00e9\u201c pri odosielan\u00ed paketov. Pre UDP bola pridan\u00e1 podpora GRO (Generic Receive Offload). Bola pridan\u00e1 podpora prij\u00edmania a odosielania TCP paketov v re\u017eime zero-copy.\n<li class=\"l\"> Bola implementovan\u00e1 realiz\u00e1cia protokolu TLS na \u00farovni jadra (KTLS), ktor\u00e1 sa teraz m\u00f4\u017ee pou\u017e\u00edva\u0165 nielen na odosielan\u00e9, ale aj na prij\u00edman\u00e9 data.\n<li class=\"l\"> Ako backend pre n\u00e1stroj firewall je predvolene pou\u017eit\u00fd<br \/>\nnftables. Vo\u013eite\u013ene bola pridan\u00e1 podpora <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48117\">bpfilter<\/a><\/noindex>.<\/p>\n<li class=\"l\"> Pridan\u00e1 podpora subsyst\u00e9mu XDP (eXpress Data Path), ktor\u00fd umo\u017e\u0148uje v Linuxe sp\u00fa\u0161\u0165a\u0165 BPF programy na \u00farovni sie\u0165ov\u00e9ho ovl\u00e1da\u010da s mo\u017enos\u0165ou priameho pr\u00edstupu k DMA-bufrom paketov a pred alokovan\u00edm bufferu skbuff sie\u0165ov\u00fdm z\u00e1sobn\u00edkom.\n<li class=\"l\"> Vylep\u0161en\u00fd a zapnut\u00fd pri pou\u017eit\u00ed UEFI Secure Boot re\u017eimu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51591\">Lockdown<\/a><\/noindex>, ktor\u00fd obmedzuje pr\u00edstup pou\u017e\u00edvate\u013ea root k jadru a blokuje obch\u00e1dzacie cesty UEFI Secure Boot. Napr\u00edklad v re\u017eime lockdown je obmedzen\u00fd pr\u00edstup k \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, ladeniu kprobes, mmiotrace, tracefs, BPF, PCMCIA CIS (Card Information Structure), niektor\u00fdm rozhraniam ACPI a MSR registr\u00e1m CPU, blokuj\u00fa sa volania kexec_file a kexec_load, zakazuje sa prechod do sp\u00e1nkov\u00e9ho re\u017eimu, obmedzuje sa vyu\u017e\u00edvanie DMA pre PCI zariadenia, zakazuje sa import k\u00f3du ACPI z premennej EFI, nedovo\u013euj\u00fa sa manipul\u00e1cie s portami vstupu\/v\u00fdstupu, vr\u00e1tane zmeny \u010d\u00edsla preru\u0161en\u00ed a portu vstupu\/v\u00fdstupu pre s\u00e9riov\u00fd port.\n<li class=\"l\"> Pridan\u00e1 podpora roz\u0161\u00edren\u00fdch in\u0161trukci\u00ed IBRS (Enhanced Indirect Branch Restricted Speculation), ktor\u00e9 umo\u017e\u0148uj\u00fa adapt\u00edvne povo\u013eova\u0165 a zakazova\u0165 \u0161pekulat\u00edvne vykon\u00e1vanie in\u0161trukci\u00ed po\u010das spracovania preru\u0161enia, syst\u00e9mov\u00fdch volan\u00ed a prep\u00ednania kontextov. Pri podporovanej Enhanced IBRS sa t\u00e1to met\u00f3da uplat\u0148uje na ochranu pred \u00fatokmi triedy Spectre V2 namiesto Retpoline, preto\u017ee dosahuje vy\u0161\u0161\u00ed v\u00fdkon.\n<li class=\"l\"> Vylep\u0161en\u00e1 ochrana v adres\u00e1roch, ktor\u00e9 s\u00fa pr\u00edstupn\u00e9 na z\u00e1pis. V tak\u00fdchto adres\u00e1roch je zak\u00e1zan\u00e9 vytv\u00e1ra\u0165 FIFO s\u00fabory a s\u00fabory, ktor\u00e9 patria pou\u017e\u00edvate\u013eom, ktor\u00ed sa nezhoduj\u00fa s vlastn\u00edkom adres\u00e1ra s povolen\u00edm sticky.\n<li class=\"l\"> Predvolene je na syst\u00e9moch ARM zapnut\u00e1 n\u00e1hodn\u00e1 prerozdelenos\u0165 adresn\u00e9ho priestoru jadra na syst\u00e9moch (KASLR). Pre Aarch64 je zapnut\u00e1 autentifik\u00e1cia ukazovate\u013eov.\n<li class=\"l\"> Bola pridan\u00e1 podpora \u201eNVMe over Fabrics TCP\u201c.\n<li class=\"l\"> Pridan\u00fd ovl\u00e1da\u010d virtio-pmem, ktor\u00fd predstavuje pr\u00edstup k \u00falo\u017en\u00fdm zariadeniam odr\u00e1\u017eaj\u00facim sa vo fyzickom adresnom priestore, ako je NVDIMM.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52670\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Oracle \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043f\u0435\u0440\u0432\u044b\u0439 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0432\u044b\u043f\u0443\u0441\u043a Unbreakable Enterprise Kernel 6 (UEK R6), \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u043d\u043e\u0439 \u0441\u0431\u043e\u0440\u043a\u0438 \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0438\u0446\u0438\u043e\u043d\u0438\u0440\u0443\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0435 Oracle Linux \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u044b \u0448\u0442\u0430\u0442\u043d\u043e\u043c\u0443 \u043f\u0430\u043a\u0435\u0442\u0443 \u0441 \u044f\u0434\u0440\u043e\u043c \u0438\u0437 Red Hat Enterprise Linux. \u042f\u0434\u0440\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440 x86_64 \u0438 ARM64 (aarch64). \u0418\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0442\u0435\u043a\u0441\u0442\u044b \u044f\u0434\u0440\u0430, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u0440\u0430\u0437\u0431\u0438\u0432\u043a\u0443 \u043d\u0430 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0430\u0442\u0447\u0438, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u0432 \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u043e\u043c [&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-76724","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=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Oracle 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