{"id":52319,"date":"2020-02-18T08:41:57","date_gmt":"2020-02-18T05:41:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd"},"modified":"2020-02-18T08:41:57","modified_gmt":"2020-02-18T05:41:57","slug":"uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd","title":{"rendered":"Zranite\u013enos\u0165 v hyperv\u00edzore VMM, vyv\u00edjanom projektom OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V dod\u00e1vanom hyperv\u00edzore OpenBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=45316\">VMM<\/a><\/noindex> bola zisten\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/marc.info\/?l=openbsd-tech&#038;m=158176939604512&#038;w=2\">zranite\u013enos\u0165<\/a><\/noindex>, ktor\u00e1 umo\u017e\u0148uje prostredn\u00edctvom man\u00e9vrov na strane hos\u0165ovsk\u00e9ho syst\u00e9mu dosiahnu\u0165 prep\u00edsanie obsahu oblast\u00ed pam\u00e4te jadra hostite\u013esk\u00e9ho prostredia. Probl\u00e9m je sp\u00f4soben\u00fd t\u00fdm, \u017ee \u010das\u0165 fyzick\u00fdch adries hos\u0165ovsk\u00e9ho syst\u00e9mu (GPA, Guest Physical Address) je zrkadlen\u00e1 v virtu\u00e1lnom adresnom priestore jadra (KVA), ale na GPA sa neuplat\u0148uje ochrana pred z\u00e1pisom do oblast\u00ed KVA, ktor\u00e9 s\u00fa ozna\u010den\u00e9 len na \u010d\u00edtanie. V d\u00f4sledku nedostatku potrebn\u00fdch kontrol v funkcii evmm_update_pvclock() je mo\u017en\u00e9 dosiahnu\u0165 prenos KVA adries hostite\u013esk\u00e9ho syst\u00e9mu do volania pmap a prep\u00edsa\u0165 obsah pam\u00e4te jadra.<\/p>\n<p>Doplnok: V\u00fdvoj\u00e1ri OpenBSD vydali <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.6\/common\/020_vmm_pvclock.patch.sig\">z\u00e1plata<\/a><\/noindex> na opravu zranite\u013enosti.<\/p>\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=52378\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 OpenBSD \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 VMM \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u0431\u043b\u0430\u0441\u0442\u0435\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 host-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u0447\u0430\u0441\u0442\u044c \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b (GPA, Guest Physical Address) \u043e\u0442\u0440\u0430\u0436\u0435\u043d\u0430 \u0432 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0435 \u0430\u0434\u0440\u0435\u0441\u043d\u043e\u0435 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u043e \u044f\u0434\u0440\u0430 (KVA), \u043d\u043e \u0434\u043b\u044f GPA \u043d\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 \u0437\u0430\u043f\u0438\u0441\u0438 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 KVA, \u043f\u043e\u043c\u0435\u0447\u0435\u043d\u043d\u044b\u0435 \u0442\u043e\u043b\u044c\u043a\u043e [&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-52319","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 OpenBSD \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 VMM \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/sk\/blog\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd\" \/>\n\t\t<meta name=\"generator\" content=\"All 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