{"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\/fr\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"La protection logicielle contre l'attaque LVI propos\u00e9e par Google a montr\u00e9 une baisse de performance de 14 fois","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zola Bridges de Google a propos\u00e9<\/a><\/noindex> pour le jeu de compilateurs LLVM, un patch mettant en \u0153uvre la protection SESES (Suppression des Effets Secondaires de l'Ex\u00e9cution Sp\u00e9culative), qui aide \u00e0 bloquer les attaques contre le m\u00e9canisme d'ex\u00e9cution sp\u00e9culative dans les CPU Intel, semblables \u00e0 (Load Value Injection,<\/a><\/noindex>. La m\u00e9thode de protection est r\u00e9alis\u00e9e au niveau du compilateur et repose sur l'ajout par le compilateur, lors de la g\u00e9n\u00e9ration du code machine, d'instructions LFENCE<\/a><\/noindex>, qui sont ins\u00e9r\u00e9es avant chaque instruction de lecture ou d'\u00e9criture en m\u00e9moire, ainsi qu'avant la premi\u00e8re instruction de branchement dans un groupe d'instructions terminant un bloc. <\/p>\n

L'instruction LFENCE attend la fixation de toutes les op\u00e9rations de lecture en m\u00e9moire pr\u00e9c\u00e9dentes et interdit l'ex\u00e9cution anticip\u00e9e des instructions suivantes apr\u00e8s LFENCE, jusqu'\u00e0 ce que la fixation soit termin\u00e9e. L'utilisation de LFENCE entra\u00eene une baisse significative des performances, c'est pourquoi il est propos\u00e9 de l'appliquer dans des cas extr\u00eames pour un code particuli\u00e8rement critique. En plus de la protection compl\u00e8te, le patch propose trois options permettant de d\u00e9sactiver s\u00e9lectivement certains niveaux de protection pour r\u00e9duire l'impact n\u00e9gatif sur les performances. <\/p>\n

Dans les tests effectu\u00e9s, l'application de la protection SESES pour le package BoringSSL a entra\u00een\u00e9 une r\u00e9duction du nombre d'op\u00e9rations effectu\u00e9es par la biblioth\u00e8que par seconde d'un facteur de 14 \u2014 la performance de la version prot\u00e9g\u00e9e de la biblioth\u00e8que \u00e9tant en moyenne seulement de 7,1 % par rapport aux performances de la version non prot\u00e9g\u00e9e (\u00e9cart selon le test de 4 % \u00e0 23 %). <\/p>\n

Pour comparaison, propos\u00e9<\/a><\/noindex> auparavant pour GNU Assembler, le m\u00e9canisme r\u00e9alisant le remplacement de LFENCE apr\u00e8s chaque op\u00e9ration de chargement en m\u00e9moire et avant certaines instructions de branchement a montr\u00e9 une r\u00e9duction des performances d'environ 5 fois (22 % par rapport au code sans protection). La m\u00e9thode de protection a \u00e9galement a \u00e9t\u00e9 propos\u00e9<\/a><\/noindex> et mis en \u0153uvre<\/a><\/noindex> \u00e9t\u00e9 d\u00e9velopp\u00e9e par les ing\u00e9nieurs d'Intel, mais les r\u00e9sultats des tests de performance pour celle-ci n'ont pas encore \u00e9t\u00e9 publi\u00e9s. \u00c0 l'origine, les chercheurs qui ont identifi\u00e9 l'attaque LVI avaient pr\u00e9vu une r\u00e9duction des performances lors de l'application de la protection compl\u00e8te de 2 \u00e0 19 fois. <\/p>\n

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

Source : 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\udd47La protection logicielle propos\u00e9e par Google contre l'attaque LVI a montr\u00e9 une r\u00e9duction des performances de 14 fois | ProHoster","description":"Zola Bridges de Google a propos\u00e9 pour le jeu de compilateurs LLVM un patch mettant en \u0153uvre la protection SESES (Ex\u00e9cution Sp\u00e9culative).","canonical_url":"https:\/\/prohoster.info\/fr\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"fr_FR","og:site_name":"ProHoster | \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 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