{"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\/et\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"Google'i pakutud LVI r\u00fcnnakuteabe kaitse on n\u00e4idanud 14 korda madalamat j\u00f5udlust","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zola Bridges Google'ist soovitas<\/a><\/noindex> LLVM kompilaatorite kogumikule m\u00f5eldud pat\u0161, mis rakendab SESES (Speculative Execution Side Effect Suppression) kaitset, mis aitab blokeerida Intel'i CPU spekulatiivse t\u00e4itmise mehhanismi r\u00fcnnakud, nagu LVI<\/a><\/noindex>. Kaitse meetod on ellu viidud kompilaatori tasemel ja p\u00f5hineb kompilaatori genereeritud masinkoodi k\u00e4skude lisamisel. LFENCE<\/a><\/noindex>, mis paigaldatakse iga m\u00e4lust lugemise v\u00f5i m\u00e4lu kirjutamise k\u00e4su ette, samuti enne esimest haruk\u00e4sku k\u00e4sugrupis, mis l\u00f5petab ploki. <\/p>\n

LFENCE k\u00e4sk ootab, kuni k\u00f5ik eelnevad operatsioonid m\u00e4lust lugemise l\u00f5petavad ja keelab edasise t\u00e4itmise p\u00e4rast LFENCE k\u00e4sku, kuni fikseerimine on l\u00f5petatud. LFENCE rakendamine p\u00f5hjustab m\u00e4rkimisv\u00e4\u00e4rset j\u00f5udluse langust, seet\u00f5ttu on soovitatav kaitset rakendada \u00e4\u00e4rmuslikes olukordades vaid eriti kriitilise koodi puhul. Peale t\u00e4ieliku kaitse pakub pat\u0161 kolme lippu, mis v\u00f5imaldavad valikuliselt keelata teatud kaitse tasemeid j\u00f5udluse negatiivse m\u00f5ju v\u00e4hendamiseks. <\/p>\n

Testide k\u00e4igus t\u00f5i SESES-i kaitse kasutamine BoringSSL paketis kaasa 14-kordse v\u00e4henemise sekundaarselt teostatavate teekide operatsioonide arvu \u2014 sellise kaitsega kogutud teegi keskmine tootlikkus oli vaid 7,1% kaitseta versiooni n\u00e4itajatest (testide viga 4% kuni 23%). <\/p>\n

V\u00f5rdluseks, pakutud<\/a><\/noindex> varem GNU Assembleris mehhanism, mis asendas LFENCE'i igal m\u00e4lust laadimise operatsiooni j\u00e4rel ja enne m\u00f5ningaid harutehingute k\u00e4ske, n\u00e4itas tootlikkuse langust umbes 5 korda (22% kaitseta koodist). Kaitsemeetod on samuti pakutud<\/a><\/noindex> ja rakendatud<\/a><\/noindex> inseneride Intel poolt, kuid selle tootlikkuse testimise tulemusi pole veel avaldatud. Alguses prognoosisid LVI r\u00fcnnaku avastanud teadlased, et t\u00e4ielikku kaitset rakendades v\u00e4heneb tootlikkus 2-19 korda. <\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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 […]<\/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\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Google'i pakutud LVI-r\u00fcnnaku kaitsetarkvara n\u00e4itas 14-kordset j\u00f5udluse langust | ProHoster","description":"Zola Bridges Google'ist pakkus LLVM kompilaatorite komplekti jaoks SESES (Speculative Execution Side) kaitse rakenduse 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