{"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\/sq\/blog\/news\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat","title":{"rendered":"Teknika e re e sulmit RowHammer n\u00eb memorien DRAM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
Kompania Google paraqiti 'Half-Double', nj\u00eb teknik\u00eb t\u00eb re sulmi t\u00eb klas\u00ebs RowHammer, e cila lejon ndryshimin e p\u00ebrmbajtjes s\u00eb bit\u00ebve t\u00eb ve\u00e7ant\u00eb t\u00eb memorjes dinamike t\u00eb aksessit (DRAM). Sulmi riprodhohet n\u00eb disa \u00e7ipa modern\u00eb DRAM, prodhuesit e t\u00eb cil\u00ebve arrit\u00ebn t\u00eb reduktojn\u00eb gjeometrin\u00eb e qelizave. <\/p>\n
Kujtojm\u00eb se sulmet e klas\u00ebs RowHammer lejojn\u00eb deformimin e p\u00ebrmbajtjes s\u00eb bit\u00ebve t\u00eb ve\u00e7ant\u00eb t\u00eb memorjes p\u00ebrmes leximeve ciklike t\u00eb t\u00eb dh\u00ebnave nga qelizat fqinj\u00eb t\u00eb memorjes. Duke qen\u00eb se memorja DRAM p\u00ebrb\u00ebn nj\u00eb grumbull dy-dimensional t\u00eb qelizave, secila nga t\u00eb cilat p\u00ebrb\u00ebhet nga nj\u00eb kondensator dhe nj\u00eb transistor, ekzekutimi i leximit t\u00eb vazhduesh\u00ebm t\u00eb nj\u00eb zone t\u00eb nj\u00ebjt\u00eb t\u00eb memorjes \u00e7on n\u00eb fluktuacione t\u00eb tensionit dhe anomalit\u00eb, duke shkaktuar humbje t\u00eb vog\u00ebl t\u00eb ngarkes\u00ebs nga qelizat fqinj\u00eb. N\u00ebse intensiteti i leximit \u00ebsht\u00eb mjaft i madh, at\u00ebher\u00eb qeliza fqinj\u00eb mund t\u00eb humbas\u00eb nj\u00eb sasi t\u00eb konsiderueshme ngarkese dhe cikli i ardhsh\u00ebm i rigjenerimit nuk do t\u00eb arrij\u00eb t\u00eb rikthej\u00eb gjendjen e saj fillestare, duke rezultuar n\u00eb ndryshimin e vler\u00ebs t\u00eb t\u00eb dh\u00ebnave t\u00eb ruajtura n\u00eb at\u00eb qelize. <\/p>\n
P\u00ebr t\u00eb mbrojtur nga RowHammer, prodhuesit e \u00e7ipave implementuan mekanizmin TRR (Target Row Refresh), i cili mbron nga deformimi i qelizave n\u00eb rreshtat p\u00ebrkat\u00ebs. Metoda Half-Double lejon anashkalimin e k\u00ebsaj mbrojtjeje, duke manipuluar me faktin se deformimet nuk jan\u00eb t\u00eb kufizuara n\u00eb rreshtat p\u00ebrkat\u00ebs dhe p\u00ebrhapen n\u00eb rreshta t\u00eb tjer\u00eb memorie, ndon\u00ebse n\u00eb nj\u00eb shkall\u00eb m\u00eb t\u00eb vog\u00ebl. Inxhinier\u00ebt e Google treguan se p\u00ebr rreshtat e memorie 'A', 'B' dhe 'C', \u00ebsht\u00eb e mundur t\u00eb sulmohet rreshti 'C' me nj\u00eb qasje shum\u00eb intensive n\u00eb rreshtin 'A' dhe nj\u00eb aktivitet t\u00eb vog\u00ebl q\u00eb prek rreshtin 'B'. K\u00ebrkesat p\u00ebr rreshtin 'B' gjat\u00eb sulmit aktivizojn\u00eb nj\u00eb rrjedhje jo-lineare t\u00eb ngarkesave dhe lejojn\u00eb p\u00ebrdorimin e rreshtit 'B' si nj\u00eb transporter p\u00ebr t\u00eb transmetuar efektin Rowhammer nga rreshti 'A' n\u00eb 'C'.
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N\u00eb ndryshim nga sulmi TRRespass, i cili manipulohet nga dob\u00ebsit\u00eb n\u00eb zbatime t\u00eb ndryshme t\u00eb mekanizmit t\u00eb parandalimit t\u00eb deformimit t\u00eb qelizave, sulmi Half-Double bazohet n\u00eb vetit\u00eb fizike t\u00eb substratit t\u00eb silikonit. Half-Double tregon se efektet q\u00eb ndoshta shkaktojn\u00eb Rowhammer jan\u00eb nj\u00eb pron\u00eb e distanc\u00ebs, jo e ngjitjes s\u00eb drejtp\u00ebrdrejt\u00eb t\u00eb qelizave. Me zvog\u00eblimin e gjeometris\u00eb s\u00eb qelizave n\u00eb \u00e7ipat modern\u00eb, rritet edhe rrethi i ndikimit t\u00eb deformimeve. Nuk p\u00ebrjashtohet q\u00eb efekti t\u00eb v\u00ebrehet gjithashtu n\u00eb nj\u00eb distanc\u00eb m\u00eb t\u00eb madhe se dy rreshta. <\/p>\n
S\u00eb bashku me asociacionin JEDEC, \u00ebsht\u00eb p\u00ebrgatitur nj\u00eb seri propozimesh me analiz\u00ebn e mund\u00ebsive t\u00eb bllokimit t\u00eb sulmeve t\u00eb tilla. Informacioni mbi metod\u00ebn \u00ebsht\u00eb zbuluar, pasi Google beson se hulumtimi i kryer zgjeron ndjesh\u00ebm kuptimin e fenomenit Rowhammer dhe thekson r\u00ebnd\u00ebsin\u00eb e bashk\u00ebpunimit mes hulumtuesve, prodhuesve t\u00eb \u00e7ipave dhe pal\u00ebve t\u00eb tjera t\u00eb interesuara n\u00eb zhvillimin e nj\u00eb zgjidhjeje gjith\u00ebp\u00ebrfshir\u00ebse dhe afatgjat\u00eb p\u00ebr mbrojtje. \n Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
![\"Teknika](\"\/wp-content\/uploads\/2021\/05\/3b26e2f816dd022ccaaf8928c4660360.png\")
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