{"id":100281,"date":"2021-05-26T04:22:47","date_gmt":"2021-05-26T02:22:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat"},"modified":"2021-05-26T04:22:47","modified_gmt":"2021-05-26T02:22:48","slug":"novaya-tehnika-ataki-rowhammer-na-dram-pamyat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat","title":{"rendered":"Uus RowHammer r\u00fcndehnika DRAM-m\u00e4lule","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Google esitles \"Half-Double\", uut RowHammer r\u00fcnnakutehnikat, mis v\u00f5imaldab muuta d\u00fcnaamilise l\u00e4bip\u00e4\u00e4su m\u00e4lu (DRAM) \u00fcksikute bittide sisu. R\u00fcnnak on teostatav mitmetel kaasaegsetel DRAM kiipidel, mille tootjad on suutnud rakendust kasvatada rakke. <\/p>\n

Tuletame meelde, et RowHammer klassi r\u00fcnnakud v\u00f5imaldavad \u00fcksikute m\u00e4lu bittide sisu moonutada, lugedes korraga naaberrakkudest andmeid. Kuna DRAM m\u00e4lu on kaheulatuslik rakenduste massiiv, mis koosneb kondensaatoritest ja transistoreist, toob pidev \u00fche ja sama m\u00e4lualase lugemise sooritamine kaasa pingefluktatsioone ja anomaaliaid, mis p\u00f5hjustavad naaberrakkude v\u00e4ikest laengukaotust. Kui lugemise intensiivsus on piisavalt suur, v\u00f5ib naaberaken kaotada piisavalt palju laengut, nii et j\u00e4rgmine regeneratsiooni ts\u00fckkel ei suuda taastada selle algset seisundit, mis viib andmete v\u00e4\u00e4rtuse muutumiseni, mis on salvestatud rakend. <\/p>\n

RowHammeri eest kaitsmiseks on kiibitootjad rakendanud TRR (Target Row Refresh) mehhanismi, mis kaitseb naaberreades rakkude moonutamise eest. Half-Double meetod v\u00f5imaldab selle kaitse \u00fcle kavaldada, manipuleerides sellega, et moonutused ei ole piiratud naaberridadega ning ulatuvad ka teistesse m\u00e4luread, kuigi v\u00e4hemal m\u00e4\u00e4ral. Google'i insenerid n\u00e4itasid, et j\u00e4rjestikuste m\u00e4lureade \"A\", \"B\" ja \"C\" puhul on v\u00f5imalik r\u00fcnnata rida \"C\", kui rida \"A\" on v\u00e4ga intensiivselt ligip\u00e4\u00e4setav ning rida \"B\" on v\u00e4hem aktiivne. R\u00fcngastused rida \"B\" ajal r\u00fcnnaku k\u00e4igus aktiveerivad mittelineaarse laengu leket ning v\u00f5imaldavad kasutada rida \"B\" transpordina Rowhammeri efekti edastamiseks rea \"A\" kaudu rida \"C\".

\"Uus<\/center> <\/p>\n

Erinevalt TRRespass r\u00fcnnakust, mis man\u00f6\u00f6verdab erinevate rakenduste rikkeid rakkude moonutuste ennetamiseks, p\u00f5hineb Half-Double r\u00fcnnak f\u00fc\u00fcsilistel omadustel, mida omab silikoonaluskate. Half-Double n\u00e4itab, et Rowhammer'ile iseloomulikud efektid s\u00f5ltuvad t\u00f5en\u00e4oliselt kaugusest, mitte rakkude vahetust kontaktist. Moodulite rakenduste geomeetria v\u00e4henemine p\u00f5hjustab moonutuste m\u00f5ju ulatuse suurenemist. Pole v\u00e4listatud, et efekti v\u00f5ib t\u00e4heldada rohkem kui kahe rea kaugusel. <\/p>\n

K\u00e4ib jutt, et koos JEDEC-i assotsiatsiooniga on v\u00e4lja t\u00f6\u00f6tatud mitu ettepanekut sarnaste r\u00fcnnakute blokeerimise v\u00f5imaluste anal\u00fc\u00fcsimiseks. Meetodi teave on avaldatud, kuna Google usub, et teostatav uurimus laiendab oluliselt arusaamist Rowhammeri fenomenist ja r\u00f5hutab teadlaste, kiibitootjate ja teiste osaliste koost\u00f6\u00f6 t\u00e4htsust t\u00e4ieliku ja pikaajalise kaitse lahenduse v\u00e4ljat\u00f6\u00f6tamisel.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 «Half-Double», \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 RowHammer, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 (DRAM). \u0410\u0442\u0430\u043a\u0430 \u0432\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043d\u0430 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0447\u0438\u043f\u0430\u0445 DRAM, \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0434\u043e\u0431\u0438\u043b\u0438\u0441\u044c \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u0438\u044f \u0433\u0435\u043e\u043c\u0435\u0442\u0440\u0438\u0438 \u044f\u0447\u0435\u0435\u043a. \u041d\u0430\u043f\u043e\u043c\u043d\u0438\u043c, \u0447\u0442\u043e \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 RowHammer \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0438\u0441\u043a\u0430\u0437\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0443\u0442\u0451\u043c \u0446\u0438\u043a\u043b\u0438\u0447\u043d\u043e\u0433\u043e \u0447\u0442\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u0441\u043e\u0441\u0435\u0434\u043d\u0438\u0445 \u044f\u0447\u0435\u0435\u043a \u043f\u0430\u043c\u044f\u0442\u0438. \u0422\u0430\u043a \u043a\u0430\u043a \u043f\u0430\u043c\u044f\u0442\u044c DRAM \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100282,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100281","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Uus RowHammer r\u00fcnnaku tehnika DRAM-i m\u00e4lule | ProHoster","description":"Ettev\u00f5te Google tutvustas \"Half-Double\", 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