{"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\/de\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"Die von Google vorgeschlagene Softwarel\u00f6sung zum Schutz vor LVI-Angriffen hat die Leistung um das 14-fache verringert","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Zola Bridges von Google <noindex><a rel=\"nofollow\" href=\"https:\/\/reviews.llvm.org\/D75939\">vorgeschlagen<\/a><\/noindex> f\u00fcr die LLVM-Compiler-Suite Patch mit der Implementierung des SESES-Schutzes (Speculative Execution Side Effect Suppression), der hilft, Angriffe auf das spekulative Ausf\u00fchrungsmechanismus in Intel-CPUs zu blockieren, \u00e4hnlich <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52517\">LVI<\/a><\/noindex>. Die Schutzmethode wird auf der Ebene des Compilers implementiert und basiert auf der Hinzuf\u00fcgung von Anweisungen durch den Compiler bei der Generierung von Maschinencode. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.felixcloutier.com\/x86\/lfence\">LFENCE<\/a><\/noindex>, die vor jeder Speicherleseanweisung oder Speicherung sowie vor der ersten Verzweigungsanweisung in einer Gruppe von Anweisungen eingef\u00fcgt werden, die einen Block abschlie\u00dft. <\/p>\n<p>Die LFENCE-Anweisung wartet darauf, dass alle vorherigen Speicheroperationen abgeschlossen sind, und verhindert die vorzeitige Ausf\u00fchrung der nach LFENCE folgenden Anweisungen, bis der Abschluss erfolgt ist. Der Einsatz von LFENCE f\u00fchrt zu einer erheblichen Leistungsreduktion, weshalb der Schutz in extremen F\u00e4llen f\u00fcr besonders kritischen Code empfohlen wird. Neben dem vollst\u00e4ndigen Schutz bietet der Patch drei Flags, mit denen bestimmte Schutzstufen selektiv deaktiviert werden k\u00f6nnen, um die negativen Auswirkungen auf die Leistung zu verringern. <\/p>\n<p>In durchgef\u00fchrten Tests f\u00fchrte der Einsatz des SESES-Schutzes f\u00fcr das BoringSSL-Paket zu einer Verringerung der von der Bibliothek pro Sekunde durchgef\u00fchrten Operationen um das 14-fache - die Leistung der mit Schutz gesch\u00fctzten Bibliothek lag im Durchschnitt bei nur 7,1% der Werte der ungesch\u00fctzten Variante (Schwankungen je nach Test von 4% bis 23%). <\/p>\n<p>Zum Vergleich, <noindex><a rel=\"nofollow\" href=\"http:\/\/git.yoctoproject.org\/cgit.cgi\/poky\/commit\/?id=b353a8069ba1b7691aa198115e047211c93f09c4\">vorgeschlagen<\/a><\/noindex> Zuvor zeigte der Mechanismus f\u00fcr den GNU Assembler, der LFENCE nach jeder Speicherladung und vor bestimmten Verzweigungsanweisungen einf\u00fcgt, eine Leistungsreduzierung von etwa dem 5-Fachen (22 % des Codes ohne Schutz). Die Schutzmethode wurde ebenfalls <noindex><a rel=\"nofollow\" href=\"https:\/\/software.intel.com\/security-software-guidance\/insights\/deep-dive-load-value-injection\">wurde angeboten<\/a><\/noindex> und <noindex><a rel=\"nofollow\" href=\"https:\/\/reviews.llvm.org\/D75937\">implementiert.<\/a><\/noindex> von Ingenieuren bei Intel entwickelt, aber die Leistungstest-Ergebnisse daf\u00fcr wurden bisher nicht ver\u00f6ffentlicht. Urspr\u00fcnglich hatten die Forscher, die die LVI-Attacke entdeckten, mit einer Leistungsreduzierung im Bereich von 2-19-fach bei vollst\u00e4ndigem Schutz gerechnet. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Quelle: <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 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Zola Bridges \u0438\u0437 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