{"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\/cs\/blog\/news\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat","title":{"rendered":"Nov\u00e1 technika \u00fatoku RowHammer na DRAM pam\u011b\u0165","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spole\u010dnost Google p\u0159edstavila \"Half-Double\", novou techniku \u00fatok\u016f t\u0159\u00eddy RowHammer, kter\u00e1 umo\u017e\u0148uje zm\u011bnit obsah jednotliv\u00fdch bit\u016f dynamick\u00e9 opera\u010dn\u00ed pam\u011bti (DRAM). \u00datok se reprodukuje na n\u011bkter\u00fdch modern\u00edch \u010dipech DRAM, jejich\u017e v\u00fdrobci dos\u00e1hli zmen\u0161en\u00ed geometrie bun\u011bk. <\/p>\n

P\u0159ipome\u0148me, \u017ee \u00fatoky typu RowHammer umo\u017e\u0148uj\u00ed zkreslit obsah jednotliv\u00fdch bit\u016f pam\u011bti opakovan\u00fdm \u010dten\u00edm dat z vedlej\u0161\u00edch bun\u011bk pam\u011bti. Pam\u011b\u0165 DRAM p\u0159edstavuje dvourozm\u011brn\u00e9 pole bun\u011bk, z nich\u017e ka\u017ed\u00e1 se skl\u00e1d\u00e1 z kondenz\u00e1toru a tranzistoru, a neust\u00e1l\u00e9 \u010dten\u00ed t\u00e9\u017ee oblasti pam\u011bti vede k kol\u00eds\u00e1n\u00ed nap\u011bt\u00ed a anomali\u00edm, kter\u00e9 zp\u016fsobuj\u00ed mal\u00e9 ztr\u00e1ty n\u00e1boje v okoln\u00edch bu\u0148k\u00e1ch. Pokud je intenzita \u010dten\u00ed dostate\u010dn\u011b vysok\u00e1, sousedn\u00ed bu\u0148ka m\u016f\u017ee ztratit natolik velk\u00e9 mno\u017estv\u00ed n\u00e1boje, \u017ee dal\u0161\u00ed cyklus regenerace nem\u00e1 \u010das obnovit jej\u00ed p\u016fvodn\u00ed stav, co\u017e vede k zm\u011bn\u011b hodnoty ulo\u017een\u00e9 v t\u00e9to bu\u0148ce. <\/p>\n

Pro ochranu proti RowHammer v\u00fdrobci \u010dip\u016f implementovali mechanismus TRR (Target Row Refresh), kter\u00fd chr\u00e1n\u00ed p\u0159ed zkreslen\u00edm bun\u011bk v sousedn\u00edch \u0159ad\u00e1ch. Metoda Half-Double umo\u017e\u0148uje obej\u00edt tuto ochranu t\u00edm, \u017ee manipuluje s t\u00edm, \u017ee zkreslen\u00ed nejsou omezena na sousedn\u00ed \u0159ady a \u0161\u00ed\u0159\u00ed se na dal\u0161\u00ed \u0159ady pam\u011bti, i kdy\u017e v men\u0161\u00ed m\u00ed\u0159e. In\u017een\u00fd\u0159i Googlu uk\u00e1zali, \u017ee pro po sob\u011b jdouc\u00ed \u0159ady pam\u011bti \"A\", \"B\" a \"C\" je mo\u017en\u00e9 za\u00fato\u010dit na \u0159adu \"C\" p\u0159i velmi intenzivn\u00edm p\u0159\u00edstupu k \u0159ad\u011b \"A\" a mal\u00e9 aktivit\u011b zasahuj\u00edc\u00ed do \u0159ady \"B\". P\u0159\u00edstupy k \u0159ad\u011b \"B\" b\u011bhem \u00fatoku aktivuj\u00ed neline\u00e1rn\u00ed \u00faniky n\u00e1boj\u016f a umo\u017e\u0148uj\u00ed pou\u017e\u00edt \u0159adu \"B\" jako prost\u0159edn\u00edka pro p\u0159enos efektu Rowhammer z \u0159ady \"A\" na \"C\".

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

Na rozd\u00edl od \u00fatoku TRRespass, kter\u00fd manipuluje s nedostatky v r\u016fzn\u00fdch implementac\u00edch mechanismu prevence zkreslen\u00ed bun\u011bk, \u00fatok Half-Double vych\u00e1z\u00ed z fyzik\u00e1ln\u00edch vlastnost\u00ed k\u0159em\u00edkov\u00e9 substr\u00e1tu. Half-Double ukazuje, \u017ee pravd\u011bpodobn\u011b vedouc\u00ed k Rowhammer efekt\u016fm je vlastnost\u00ed vzd\u00e1lenosti, nikoli p\u0159\u00edm\u00e9ho sousedstv\u00ed bun\u011bk. P\u0159i zmen\u0161en\u00ed geometrie bun\u011bk na modern\u00edch \u010dipech se zvy\u0161uje tak\u00e9 radius vlivu zkreslen\u00ed. Nen\u00ed vylou\u010deno, \u017ee efekt bude pozorov\u00e1n na vzd\u00e1lenost v\u00edce ne\u017e dvou \u0159ad. <\/p>\n

Byla vyvinuta \u0159ada n\u00e1vrh\u016f spolu s asociac\u00ed JEDEC pro anal\u00fdzu mo\u017en\u00fdch cest k blokov\u00e1n\u00ed podobn\u00fdch \u00fatok\u016f. Informace o metod\u011b byla zve\u0159ejn\u011bna, proto\u017ee Google pova\u017euje proveden\u00fd v\u00fdzkum za v\u00fdznamn\u00e9 roz\u0161\u00ed\u0159en\u00ed ch\u00e1p\u00e1n\u00ed fenom\u00e9nu Rowhammer a zd\u016fraz\u0148uje d\u016fle\u017eitost spolupr\u00e1ce mezi v\u00fdzkumn\u00edky, v\u00fdrobci \u010dip\u016f a dal\u0161\u00edmi zainteresovan\u00fdmi stranami p\u0159i v\u00fdvoji komplexn\u00edho a dlouhodob\u00e9ho \u0159e\u0161en\u00ed pro 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\u011b\u0165 | ProHoster","description":"Spole\u010dnost Google p\u0159edstavila \"Half-Double\", novou techniku \u00fatok\u016f t\u0159\u00eddy RowHammer, kter\u00e1 umo\u017e\u0148uje zm\u011bnu obsahu jednotliv\u00fdch bit\u016f dynamick\u00e9 pam\u011bti (DRAM).","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041d\u043e\u0432\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 RowHammer \u043d\u0430 DRAM-\u043f\u0430\u043c\u044f\u0442\u044c | 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