{"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\/hu\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"A Google \u00e1ltal javasolt szoftveres v\u00e9delem az LVI t\u00e1mad\u00e1s ellen 14-szeres teljes\u00edtm\u00e9nycs\u00f6kken\u00e9st mutatott.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Google c\u00e9gt\u0151l sz\u00e1rmaz\u00f3 Zola Bridges aj\u00e1nlotta<\/a><\/noindex> az LLVM ford\u00edt\u00f3csal\u00e1d sz\u00e1m\u00e1ra k\u00e9sz\u00fclt jav\u00edt\u00e1s, amely megval\u00f3s\u00edtja az SESES (Speculative Execution Side Effect Suppression) v\u00e9delm\u00e9t, seg\u00edt blokkolni az Intel CPU spekulat\u00edv v\u00e9grehajt\u00e1si mechanizmusa ellen ir\u00e1nyul\u00f3 t\u00e1mad\u00e1sokat, amelyek hasonl\u00f3ak LVI<\/a><\/noindex>. A v\u00e9delem a ford\u00edt\u00f3 szintj\u00e9n val\u00f3sul meg, \u00e9s a g\u00e9pi k\u00f3d gener\u00e1l\u00e1sakor a ford\u00edt\u00f3 \u00e1ltal beillesztett utas\u00edt\u00e1sokra \u00e9p\u00fcl, LFENCE<\/a><\/noindex>, amelyeket minden mem\u00f3riaolvas\u00e1s vagy -\u00edr\u00e1s utas\u00edt\u00e1s el\u00e9, valamint az utas\u00edt\u00e1ssorozat els\u0151 \u00e1g\u00e1hoz a blokk v\u00e9g\u00e9n helyeznek. <\/p>\n

Az LFENCE utas\u00edt\u00e1s megk\u00f6veteli az \u00f6sszes el\u0151z\u0151 mem\u00f3riaolvas\u00e1si m\u0171velet befejez\u00e9s\u00e9t, \u00e9s megtiltja a k\u00f6vetkez\u0151 LFENCE ut\u00e1n v\u00e9grehajthat\u00f3 utas\u00edt\u00e1sok spekulat\u00edv v\u00e9grehajt\u00e1s\u00e1t, am\u00edg a befejez\u00e9s meg nem t\u00f6rt\u00e9nt. Az LFENCE alkalmaz\u00e1sa jelent\u0151s teljes\u00edtm\u00e9nycs\u00f6kken\u00e9st okoz, ez\u00e9rt a v\u00e9delmet csak a rendk\u00edv\u00fcl kritikus k\u00f3dok eset\u00e9ben javasolj\u00e1k haszn\u00e1lni. A teljes v\u00e9delem mellett a jav\u00edt\u00e1s h\u00e1rom kapcsol\u00f3t is k\u00edn\u00e1l, amelyek lehet\u0151v\u00e9 teszik bizonyos v\u00e9delmi szintek kikapcsol\u00e1s\u00e1t a teljes\u00edtm\u00e9ny cs\u00f6kkent\u00e9s\u00e9nek \u00e9rdek\u00e9ben. <\/p>\n

A v\u00e9grehajtott tesztek sor\u00e1n a SESES v\u00e9delem alkalmaz\u00e1sa a BoringSSL csomaghoz 14-szeres cs\u00f6kken\u00e9st eredm\u00e9nyezett a k\u00f6nyvt\u00e1r m\u00e1sodpercenk\u00e9nt v\u00e9grehajtott m\u0171veleteinek sz\u00e1m\u00e1ban \u2014 a v\u00e9dett verzi\u00f3 teljes\u00edtm\u00e9nye \u00e1tlagosan mind\u00f6ssze 7,1%-\u00e1t tette ki a nem v\u00e9dett verzi\u00f3\u00e9nak (a teszt f\u00fcggv\u00e9ny\u00e9ben a sz\u00f3r\u00e1s 4% \u00e9s 23% k\u00f6z\u00f6tt mozog). <\/p>\n

\u00d6sszehasonl\u00edt\u00e1sk\u00e9ppen, proposed<\/a><\/noindex> kor\u00e1bban a GNU Assembler eset\u00e9ben a mechanizmus, amely az LFENCE beilleszt\u00e9s\u00e9t v\u00e9gezte minden mem\u00f3ria bet\u00f6lt\u00e9si m\u0171velet ut\u00e1n \u00e9s n\u00e9h\u00e1ny \u00e1gak k\u00f6z\u00e9, k\u00f6r\u00fclbel\u00fcl 5-sz\u00f6r cs\u00f6kkentette a teljes\u00edtm\u00e9nyt (22% a v\u00e9delem n\u00e9lk\u00fcli k\u00f3dhoz k\u00e9pest). A v\u00e9delem m\u00f3dszere szint\u00e9n aj\u00e1nlott<\/a><\/noindex> \u00e9s megval\u00f3s\u00edtott\u00e1k<\/a><\/noindex> az Intel m\u00e9rn\u00f6keit\u0151l, de a teljes\u00edtm\u00e9nytesztel\u00e9s eredm\u00e9nyei eddig m\u00e9g nem jelentek meg. Eredetileg azok a kutat\u00f3k, akik felfedezt\u00e9k az LVI t\u00e1mad\u00e1st, 2-19-szeres teljes\u00edtm\u00e9nycs\u00f6kken\u00e9st j\u00f3soltak a teljes v\u00e9delem alkalmaz\u00e1sakor. <\/p>\n

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

Forr\u00e1s: 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\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\udd47A Google \u00e1ltal javasolt szoftveres v\u00e9delem az LVI t\u00e1mad\u00e1s ellen 14-szeres teljes\u00edtm\u00e9nycs\u00f6kken\u00e9st mutatott | ProHoster","description":"A Google c\u00e9gt\u0151l sz\u00e1rmaz\u00f3 Zola Bridges jav\u00edt\u00e1st javasolt az LLVM ford\u00edt\u00f3csal\u00e1d sz\u00e1m\u00e1ra, amely az SESES (Speculative Execution 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