{"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\/ro\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"Software protection against the LVI attack proposed by Google showed a 14-fold decrease in performance","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zola Bridges from Google a propus<\/a><\/noindex> for the LLVM compiler set patch with the implementation of SESES (Speculative Execution Side Effect Suppression) protection, helping to block attacks on Intel CPU speculative execution mechanisms, similar to LVI<\/a><\/noindex>. The protection method is implemented at the compiler level and is based on the compiler adding instructions LFENCE<\/a><\/noindex>, which are placed before each memory read or write instruction, as well as before the first branching instruction in the group of instructions that completes a block. <\/p>\n

The LFENCE instruction waits for all previous memory read operations to complete and prevents speculative execution of subsequent instructions after LFENCE until the completion of the fixation. The use of LFENCE leads to a significant decrease in performance, so the protection is recommended to be used in critical code scenarios. In addition to full protection, the patch offers three flags that allow selective disabling of certain protection levels to reduce negative performance impact. <\/p>\n

\u00cen testele efectuate, utilizarea protec\u021biei SESES pentru pachetul BoringSSL a dus la o reducere de 14 ori a num\u0103rului de opera\u021bii efectuate de bibliotec\u0103 pe secund\u0103 \u2014 performan\u021ba variantei bibliotecii protejate a fost, \u00een medie, de doar 7.1% din cifrele variantei neprotejate (varia\u021biile \u00een func\u021bie de test au fost \u00eentre 4% \u0219i 23%). <\/p>\n

Pentru compara\u021bie, propus<\/a><\/noindex> earlier for the GNU Assembler, the mechanism that substitutes LFENCE after each memory load operation and before certain branching instructions showed a performance decrease of about 5 times (22% of the code without protection). The protection method was also sub licen\u021ba MIT. Instrumentul utilizeaz\u0103 metode de \u00eenv\u0103\u021bare automat\u0103, \u00eempreun\u0103 cu analiza static\u0103 \u0219i dinamic\u0103 a codului JavaScript. Se afirm\u0103 c\u0103 utilizarea \u00eenv\u0103\u021b\u0103rii automate a permis \u00eembun\u0103t\u0103\u021birea semnificativ\u0103 a preciziei \u00een identificarea codului pentru identificarea ascuns\u0103 \u0219i a identificat cu 26% mai multe scripturi problematice<\/a><\/noindex> \u0219i a fost implementat<\/a><\/noindex> engineered by Intel, but performance testing results for it have not yet been published. Initially, researchers who identified the LVI attack predicted a performance drop of 2-19 times with full protection. <\/p>\n

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

Sursa: opennet.ro<\/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\udd47The software protection against the LVI attack proposed by Google showed a 14-fold decrease in performance | ProHoster","description":"Zola Bridges from Google proposed a patch with the implementation of SESES protection for the LLVM compiler 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