{"id":74882,"date":"2020-03-21T14:41:55","date_gmt":"2020-03-21T11:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz"},"modified":"2020-03-21T14:41:55","modified_gmt":"2020-03-21T11:41:55","slug":"predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"Proponowana przez Google programowa ochrona przed atakiem LVI wykaza\u0142a spadek wydajno\u015bci o 14 razy","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Zola Bridges z firmy Google <noindex><a rel=\"nofollow\" href=\"https:\/\/reviews.llvm.org\/D75939\">zaproponowa\u0142<\/a><\/noindex> dla zestawu kompilator\u00f3w LLVM \u0142atka z realizacj\u0105 ochrony SESES (Suppression Execution Side Effect Suppression), pomagaj\u0105ca blokowa\u0107 ataki na mechanizm spekulatywnego wykonania w CPU Intel, podobne do <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52517\">LVI<\/a><\/noindex>. Metoda ochrony jest realizowana na poziomie kompilatora i opiera si\u0119 na dodawaniu przez kompilator przy generowaniu kodu maszynowego instrukcji <noindex><a rel=\"nofollow\" href=\"https:\/\/www.felixcloutier.com\/x86\/lfence\">LFENCE<\/a><\/noindex>, kt\u00f3re s\u0105 wstawiane przed ka\u017cd\u0105 instrukcj\u0105 odczytu z pami\u0119ci lub zapisu do pami\u0119ci, a tak\u017ce przed pierwsz\u0105 instrukcj\u0105 rozga\u0142\u0119zienia w grupie instrukcji ko\u0144cz\u0105cej blok. <\/p>\n<p>Instrukcja LFENCE czeka na zako\u0144czenie wszystkich poprzednich operacji odczytu z pami\u0119ci i zakazuje spekulatywnego wykonania nast\u0119puj\u0105cych po LFENCE instrukcji, do momentu zako\u0144czenia tego procesu. Stosowanie LFENCE prowadzi do znacznego spadku wydajno\u015bci, dlatego ochron\u0119 zaleca si\u0119 stosowa\u0107 w skrajnych przypadkach dla wyj\u0105tkowo krytycznego kodu. Opr\u00f3cz pe\u0142nej ochrony \u0142atka oferuje trzy flagi, kt\u00f3re pozwalaj\u0105 selektywnie wy\u0142\u0105czy\u0107 okre\u015blone poziomy ochrony w celu zredukowania negatywnego wp\u0142ywu na wydajno\u015b\u0107. <\/p>\n<p>W przeprowadzonych testach zastosowanie ochrony SESES dla pakietu BoringSSL doprowadzi\u0142o do zmniejszenia liczby operacji wykonywanych przez bibliotek\u0119 na sekund\u0119 o 14 razy \u2014 wydajno\u015b\u0107 z\u0142o\u017conej wersji biblioteki z ochron\u0105 wynios\u0142a \u015brednio tylko 7,1% wska\u017anik\u00f3w wersji niezabezpieczonej (rozrzut w zale\u017cno\u015bci od testu od 4% do 23%). <\/p>\n<p>Dla por\u00f3wnania, <noindex><a rel=\"nofollow\" href=\"http:\/\/git.yoctoproject.org\/cgit.cgi\/poky\/commit\/?id=b353a8069ba1b7691aa198115e047211c93f09c4\">proponowany<\/a><\/noindex> wcze\u015bniej dla GNU Assembler mechanizm, kt\u00f3ry realizowa\u0142 wstawianie LFENCE po ka\u017cdej operacji \u0142adowania z pami\u0119ci oraz przed niekt\u00f3rymi instrukcjami rozga\u0142\u0119zienia, pokaza\u0142 spadek wydajno\u015bci o oko\u0142o 5 razy (22% kodu bez ochrony). Metoda ochrony zosta\u0142a r\u00f3wnie\u017c <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/insights\/deep-dive-load-value-injection\">zaproponowano<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"https:\/\/reviews.llvm.org\/D75937\">zrealizowano<\/a><\/noindex> opracowana przez in\u017cynier\u00f3w Intela, jednak wyniki test\u00f3w wydajno\u015bciowych dla niej nie zosta\u0142y jeszcze opublikowane. Pocz\u0105tkowo badacze, kt\u00f3rzy zidentyfikowali atak LVI, prognozowali spadek wydajno\u015bci przy zastosowaniu pe\u0142nej ochrony od 2 do 19 razy. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52581\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>Zola Bridges \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u043d\u0430\u0431\u043e\u0440\u0430 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u0432 LLVM \u043f\u0430\u0442\u0447 \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0437\u0430\u0449\u0438\u0442\u044b SESES (Speculative Execution Side Effect Suppression), \u043f\u043e\u043c\u043e\u0433\u0430\u044e\u0449\u0435\u0439 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0441\u043f\u0435\u043a\u0443\u043b\u044f\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432 CPU Intel, \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0435 LVI. \u041c\u0435\u0442\u043e\u0434 \u0437\u0430\u0449\u0438\u0442\u044b \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0430 \u0438 \u043e\u0441\u043d\u043e\u0432\u0430\u043d \u043d\u0430 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u043c \u043f\u0440\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u043c\u0430\u0448\u0438\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439 LFENCE, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043f\u0435\u0440\u0435\u0434 \u043a\u0430\u0436\u0434\u043e\u0439 \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0435\u0439 \u0447\u0442\u0435\u043d\u0438\u044f [&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-74882","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Zola Bridges \u0438\u0437 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| \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\u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u0430\u044f Google \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 \u0430\u0442\u0430\u043a\u0438 LVI \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u0430 \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432 14 \u0440\u0430\u0437 | ProHoster","og:description":"Zola Bridges \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u043d\u0430\u0431\u043e\u0440\u0430 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u0432 LLVM \u043f\u0430\u0442\u0447 \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0437\u0430\u0449\u0438\u0442\u044b SESES (Speculative Execution Side.","og:url":"https:\/\/prohoster.info\/pl\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2020-03-21T11:41:55+00:00","article:modified_time":"2020-03-21T11:41:55+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"74882","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 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