{"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\/sk\/blog\/news\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat","title":{"rendered":"Nov\u00e1 technika \u00fatoku RowHammer na DRAM pam\u00e4\u0165","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spolo\u010dnos\u0165 Google predstavila \u201eHalf-Double\u201c, nov\u00fa techniku \u00fatokov triedy RowHammer, ktor\u00e1 umo\u017e\u0148uje meni\u0165 obsah jednotliv\u00fdch bitov dynamickej opera\u010dnej pam\u00e4te (DRAM). \u00datok je reprodukovate\u013en\u00fd na niektor\u00fdch modern\u00fdch \u010dipoch DRAM, ktor\u00fdch v\u00fdrobcovia dosiahli zmen\u0161enia geometrie buniek. <\/p>\n

Pripome\u0148me, \u017ee \u00fatoky triedy RowHammer umo\u017e\u0148uj\u00fa skresli\u0165 obsah jednotliv\u00fdch bitov pam\u00e4te cyklick\u00fdm \u010d\u00edtan\u00edm \u00fadajov z ved\u013eaj\u0161\u00edch pam\u00e4\u0165ov\u00fdch buniek. Ke\u010f\u017ee pam\u00e4\u0165 DRAM predstavuje dvojdimenzion\u00e1lny maticov\u00fd syst\u00e9m buniek, z ktor\u00fdch ka\u017ed\u00e1 pozost\u00e1va z kondenz\u00e1tora a tranzistoru, nepretr\u017eit\u00e9 \u010d\u00edtanie rovnakej oblasti pam\u00e4te vedie k fluktu\u00e1ci\u00e1m nap\u00e4tia a anom\u00e1li\u00e1m, ktor\u00e9 sp\u00f4sobuj\u00fa mal\u00fa stratu n\u00e1boja vo ved\u013eaj\u0161\u00edch bunk\u00e1ch. Ak je intenzita \u010d\u00edtania dostato\u010dne vysok\u00e1, m\u00f4\u017ee ved\u013eaj\u0161ia bunka strati\u0165 dostato\u010dne ve\u013ek\u00fd objem n\u00e1boja a \u010fal\u0161\u00ed regener\u00e1cia nemus\u00ed stihn\u00fa\u0165 obnovi\u0165 jej p\u00f4vodn\u00fd stav, \u010do povedie k zmene hodnoty ulo\u017een\u00fdch \u00fadajov v bunke. <\/p>\n

Na ochranu pred RowHammer v\u00fdrobcovia \u010dipov implementovali mechanizmus TRR (Target Row Refresh), ktor\u00fd chr\u00e1ni pred skreslen\u00edm buniek v susedn\u00fdch riadkoch. Met\u00f3da Half-Double umo\u017e\u0148uje ob\u00eds\u0165 t\u00fato ochranu, manipuluj\u00fac s t\u00fdm, \u017ee skreslenia sa neobmedzuj\u00fa na susedn\u00e9 riadky a \u0161\u00edria sa na \u010fal\u0161ie riadky pam\u00e4te, aj ke\u010f v men\u0161ej miere. In\u017einieri Google uk\u00e1zali, \u017ee pre sekven\u010dn\u00e9 riadky pam\u00e4te \u201eA\u201c, \u201eB\u201c a \u201eC\u201c je mo\u017en\u00e9 za\u00fato\u010di\u0165 na riadok \u201eC\u201c pri ve\u013emi intenz\u00edvnom pr\u00edstupe k riadku \u201eA\u201c a malej aktivite, ktor\u00e1 zasahuje riadok \u201eB\u201c. Pr\u00edstupy k riadku \u201eB\u201c po\u010das \u00fatoku aktivuj\u00fa neline\u00e1rnu \u00fanik n\u00e1boja a umo\u017e\u0148uj\u00fa vyu\u017ei\u0165 riadok \u201eB\u201c ako dopravn\u00fd prostriedok na pren\u00e1\u0161anie \u00fa\u010dinku Rowhammer z riadku \u201eA\u201c na \u201eC\u201c.

\"Nov\u00e1<\/center> <\/p>\n

Na rozdiel od \u00fatoku TRRespass, ktor\u00fd manipuluje s nedostatkami v r\u00f4znych realiz\u00e1ci\u00e1ch mechanizmu zabra\u0148uj\u00faceho skresleniu buniek, \u00fatok Half-Double sa zaklad\u00e1 na fyzik\u00e1lnych vlastnostiach kremi\u010dkov\u00e9ho substr\u00e1tu. Half-Double ukazuje, \u017ee pravdepodobne ved\u00face k RowHammer efektom s\u00fa vlastnos\u0165ami vzdialenosti, a nie priamej bl\u00edzkosti buniek. Pri zmen\u0161en\u00ed geometrie buniek v modern\u00fdch \u010dipoch sa zvy\u0161uje aj r\u00e1dius vplyvu skreslen\u00ed. Nie je vyl\u00fa\u010den\u00e9, \u017ee efekt sa bude pozorova\u0165 vo vzdialenosti viac ako dvoch riadkov. <\/p>\n

Pod\u013ea spr\u00e1vy bolo spolu s asoci\u00e1ciou JEDEC vypracovan\u00fdch nieko\u013eko n\u00e1vrhov na anal\u00fdzu mo\u017en\u00fdch sp\u00f4sobov blokovania tak\u00fdchto \u00fatokov. Inform\u00e1cie o met\u00f3de boli zverejnen\u00e9, preto\u017ee Google ver\u00ed, \u017ee uskuto\u010dnen\u00fd v\u00fdskum v\u00fdznamne roz\u0161iruje porozumenie fenom\u00e9nu Rowhammer a zd\u00f4raz\u0148uje d\u00f4le\u017eitos\u0165 spolupr\u00e1ce medzi v\u00fdskumn\u00edkmi, v\u00fdrobcami \u010dipov a in\u00fdmi zainteresovan\u00fdmi stranami pri v\u00fdvoji komplexn\u00e9ho a dlhodob\u00e9ho rie\u0161enia na ochranu.
\n
Zdroj: 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\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\udd47Nov\u00e1 technika \u00fatoku RowHammer na DRAM pam\u00e4\u0165 | ProHoster","description":"Spolo\u010dnos\u0165 Google 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