{"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\/sq\/blog\/news\/predlozhennaya-google-programmnaya-zashhita-ot-ataki-lvi-pokazala-snizhenie-proizvoditelnosti-v-14-raz","title":{"rendered":"Mbrojtja e propozuar nga Google kund\u00ebr sulmit LVI ka treguar nj\u00eb r\u00ebnie t\u00eb performanc\u00ebs deri n\u00eb 14 her\u00eb.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zola Bridges nga Google propozoi<\/a><\/noindex> p\u00ebr paketat e kompiler\u00ebve LLVM, nj\u00eb patch me implementimin e mbrojtjes SESES (Speculative Execution Side Effect Suppression), q\u00eb ndihmon n\u00eb bllokimin e sulmeve ndaj mekanizmit t\u00eb ekzekutimit spekullativ n\u00eb CPU-n\u00eb Intel, t\u00eb ngjashme me LVI<\/a><\/noindex>. Metoda e mbrojtjes \u00ebsht\u00eb implementuar n\u00eb nivelin e kompilerit dhe bazohet n\u00eb shtimin e instruksioneve nga kompileri gjat\u00eb gjenerimit t\u00eb kodit makinerik LFENCE<\/a><\/noindex>, t\u00eb cilat vendosen para \u00e7do instrukcioni p\u00ebr t\u00eb lexuar nga memoria ose p\u00ebr t\u00eb shkruar n\u00eb memorie, si dhe para instrukcionit t\u00eb par\u00eb t\u00eb deg\u00ebzimit n\u00eb grupin e instrukcioneve q\u00eb p\u00ebrfundon bllokun. <\/p>\n

Instruksioni LFENCE pret q\u00eb t\u00eb gjitha operacionet e m\u00ebparshme t\u00eb leximit nga memoria t\u00eb jen\u00eb t\u00eb fiksuara dhe ndalon ekzekutimin e parashikuesh\u00ebm t\u00eb instrukcioneve pas LFENCE, derisa t\u00eb p\u00ebrfundoj\u00eb fiksa. P\u00ebrdorimi i LFENCE \u00e7on n\u00eb nj\u00eb r\u00ebnie t\u00eb ndjeshme t\u00eb performanc\u00ebs, prandaj mbrojtja rekomandohet t\u00eb aplikohet n\u00eb raste ekstreme p\u00ebr kodin ekstremisht kritik. P\u00ebrve\u00e7 mbrojtjes s\u00eb plot\u00eb, patch-i ofron tre flag-e q\u00eb lejojn\u00eb \u00e7aktivizimin selektiv t\u00eb niveleve t\u00eb caktuara t\u00eb mbrojtjes p\u00ebr t\u00eb ulur ndikimin negativ n\u00eb performanc\u00eb. <\/p>\n

N\u00eb testet e kryera, p\u00ebrdorimi i mbrojtjes SESES p\u00ebr paket\u00ebn BoringSSL \u00e7oi n\u00eb nj\u00eb reduktim t\u00eb numrit t\u00eb operacioneve t\u00eb kryera n\u00eb sekond\u00eb nga biblioteka me 14 her\u00eb \u2014 performanca e variantit t\u00eb nd\u00ebrtuar me mbrojtje rezultoi mesatarisht vet\u00ebm 7.1% e treguesve t\u00eb variantit t\u00eb pambrojtur (variacioni n\u00eb var\u00ebsi t\u00eb testit nga 4% deri n\u00eb 23%). <\/p>\n

P\u00ebr krahasim, propozuar<\/a><\/noindex> m\u00eb par\u00eb p\u00ebr GNU Assembler, mekanizmi q\u00eb realizon z\u00ebvend\u00ebsimin e LFENCE pas \u00e7do operacioni ngarkimi nga memoria dhe para disa instruksioneve t\u00eb ndarjes, tregoi nj\u00eb reduktim t\u00eb performanc\u00ebs prej rreth 5 her\u00eb (22% e kodit pa mbrojtje). Metoda e mbrojtjes gjithashtu suggested<\/a><\/noindex> dhe i realizuar<\/a><\/noindex> nga inxhinier\u00ebt e Intel, por rezultatet e testimit t\u00eb performanc\u00ebs p\u00ebr t\u00eb nuk jan\u00eb publikuar ende. Fillimisht, k\u00ebrkuesit q\u00eb identifikuan sulmin LVI parashikuan nj\u00eb reduktim t\u00eb performanc\u00ebs me p\u00ebrdorimin e mbrojtjes s\u00eb plot\u00eb nga 2-19 her\u00eb. <\/p>\n

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

Burimi: 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\udd47Mbrojtja softuerike e propozuar nga Google kund\u00ebr sulmit LVI tregoi nj\u00eb zvog\u00eblim t\u00eb performanc\u00ebs prej 14 her\u00ebsh | ProHoster","description":"Zola Bridges nga nga Google ofroi nj\u00eb patch p\u00ebr grupin e kompilator\u00ebve LLVM me implementimin e mbrojtes SESES (Speculative Execution 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