{"id":121204,"date":"2025-01-02T09:46:09","date_gmt":"2025-01-02T07:46:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/flippyram-distributiv-dlya-testirovaniya-ataki-rowhammer"},"modified":"2025-01-02T09:46:09","modified_gmt":"2025-01-02T07:46:09","slug":"flippyram-distributiv-dlya-testirovaniya-ataki-rowhammer","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/flippyram-distributiv-dlya-testirovaniya-ataki-rowhammer","title":{"rendered":"FlippyRAM \u2014 tesztel\u00e9si disztrib\u00faci\u00f3 a Rowhammer-t\u00e1mad\u00e1sokhoz","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A 38C3 konferenci\u00e1n bemutat\u00e1sra ker\u00fclt a FlippyRAM keretrendszer, amely a Rowhammer-t\u00edpus\u00fa t\u00e1mad\u00e1sokkal kapcsolatos sebezhet\u0151s\u00e9gek ellen\u0151rz\u00e9s\u00e9re k\u00e9sz\u00fclt, lehet\u0151v\u00e9 t\u00e9ve a mem\u00f3riatartalom megv\u00e1ltoztat\u00e1s\u00e1t. Az eszk\u00f6zk\u00e9szlet k\u00f3dja C++ nyelven \u00edr\u00f3dott, \u00e9s MIT licenc alatt terjesztik. Az egyszer\u0171s\u00edtett tesztel\u00e9s \u00e9rdek\u00e9ben k\u00e9sz\u00fclt egy k\u00e9sz live disztrib\u00faci\u00f3 (1 GB), amely USB Flash-r\u0151l t\u00f6rt\u00e9n\u0151 ind\u00edt\u00e1ssal teszi lehet\u0151v\u00e9 a tesztel\u00e9st, valamint egy Docker kont\u00e9ner k\u00e9p is rendelkez\u00e9sre \u00e1ll. <\/p>\n

A projekt c\u00e9lja a felhaszn\u00e1l\u00f3k bevon\u00e1sa a kutat\u00e1sba, amely statisztik\u00e1k gy\u0171jt\u00e9s\u00e9re ir\u00e1nyul, hogy mennyire jelennek meg a Rowhammer-t\u00edpus\u00fa sebezhet\u0151s\u00e9gek a megszokott rendszerekben. A tesztel\u00e9si eredm\u00e9nyek adatokat az ind\u00edtott disztrib\u00faci\u00f3b\u00f3l is k\u00fcldhet\u0151k, vagy manu\u00e1lisan is hozz\u00e1adhat\u00f3k a kutat\u00f3 oldal\u00e1hoz. <\/p>\n

A Rowhammer t\u00e1mad\u00e1si m\u00f3dszert 10 \u00e9vvel ezel\u0151tt javasolt\u00e1k, az\u00f3ta a biztons\u00e1gi kutat\u00f3k \u00e9s a hardvergy\u00e1rt\u00f3k k\u00f6z\u00f6tt macska-eg\u00e9r j\u00e1t\u00e9k zajlik \u2014 a mem\u00f3riachipek gy\u00e1rt\u00f3i pr\u00f3b\u00e1lt\u00e1k megakad\u00e1lyozni a sebezhet\u0151s\u00e9get, m\u00edg a kutat\u00f3k \u00faj m\u00f3dszereket tal\u00e1ltak annak megker\u00fcl\u00e9s\u00e9re. A DDR3 chipeken \u00e9s Intel x86 rendszereken k\u00edv\u00fcl felfedezt\u00e9k a t\u00e1mad\u00e1si m\u00f3dszereket DDR4 \u00e9s DDR5 chipeken, AMD \u00e9s ARM processzoros rendszereken, az ECC hibajav\u00edt\u00f3 mechanizmusok megker\u00fcl\u00e9s\u00e9nek lehet\u0151s\u00e9geit, valamint a h\u00e1l\u00f3zaton kereszt\u00fcl t\u00f6rt\u00e9n\u0151 t\u00e1mad\u00e1s \u00e9s JavaScript k\u00f3dok b\u00f6ng\u00e9sz\u0151ben val\u00f3 v\u00e9grehajt\u00e1s\u00e1nak m\u00f3djait. <\/p>\n

A RowHammer t\u00e1mad\u00e1s lehet\u0151v\u00e9 teszi a DRAM mem\u00f3ria egyes bitjeinek tartalm\u00e1nak eltorz\u00edt\u00e1s\u00e1t a szomsz\u00e9dos mem\u00f3riacell\u00e1kb\u00f3l sz\u00e1rmaz\u00f3 adatok ciklikus olvas\u00e1s\u00e1val. Mivel a DRAM mem\u00f3ria k\u00e9tdimenzi\u00f3s cella-m\u00e1trixot alkot, amelyek mindegyike egy kondenz\u00e1torb\u00f3l \u00e9s egy tranzisztorb\u00f3l \u00e1ll, ugyanannak a mem\u00f3riater\u00fcletnek a folyamatos olvas\u00e1sa fesz\u00fclts\u00e9gingadoz\u00e1shoz \u00e9s anom\u00e1li\u00e1khoz vezet, amely kism\u00e9ret\u0171 t\u00f6lt\u00e9svesztes\u00e9get okoz a szomsz\u00e9dos cell\u00e1kban. Ha az olvas\u00e1s intenzit\u00e1sa nagy, akkor a szomsz\u00e9dos cella elegend\u0151 t\u00f6lt\u00e9st vesz\u00edthet, \u00e9s a k\u00f6vetkez\u0151 regener\u00e1l\u00e1si ciklus nem tudja vissza\u00e1ll\u00edtani az eredeti \u00e1llapot\u00e1t, ami a t\u00e1rolt adatok megv\u00e1ltoz\u00e1s\u00e1hoz vezet. A RowHammer elleni v\u00e9delem \u00e9rdek\u00e9ben a chipek gy\u00e1rt\u00f3i TRR (Target Row Refresh) mechanizmust vezettek be, amely egyes esetekben blokkolja a cell\u00e1k eltorzul\u00e1s\u00e1t, de nem v\u00e9d a t\u00e1mad\u00e1sok minden lehets\u00e9ges form\u00e1j\u00e1t\u00f3l.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 38C3 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a FlippyRAM, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0441\u043e\u0432\u0435\u0440\u0448\u0438\u0442\u044c \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer \u0434\u043b\u044f \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438. \u041a\u043e\u0434 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u0421++ \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT. \u0414\u043b\u044f \u0443\u043f\u0440\u043e\u0449\u0435\u043d\u0438\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d \u0433\u043e\u0442\u043e\u0432\u044b\u0439 live-\u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432 (1 \u0413\u0411), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043f\u0440\u043e\u0432\u0435\u0441\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443, \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0432\u0448\u0438\u0441\u044c \u0441 USB Flash, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043e\u0431\u0440\u0430\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0434\u043b\u044f Docker. \u0426\u0435\u043b\u044c\u044e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\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-121204","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\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\udd47FlippyRAM \u2014 Rowhammer t\u00e1mad\u00e1s tesztel\u00e9s\u00e9re szolg\u00e1l\u00f3 disztrib\u00faci\u00f3 | ProHoster","description":"A 38C3 konferenci\u00e1n bemutatt\u00e1k a 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