{"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\/novosti-interneta\/novaya-tehnika-ataki-rowhammer-na-dram-pamyat","title":{"rendered":"Teknika e re e sulmit RowHammer mbi RAM-in DRAM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
Kompania Google prezantoi \"Half-Double\", nj\u00eb teknik\u00eb t\u00eb re sulmi t\u00eb klas\u00ebs RowHammer, e cila mund\u00ebson ndryshimin e p\u00ebrmbajtjes s\u00eb bit\u00ebve individual\u00eb t\u00eb memories dinamike t\u00eb aksesit t\u00eb rast\u00ebsish\u00ebm (DRAM). Sulmi zhvillohet n\u00eb disa \u00e7ipa modern\u00eb DRAM, prodhuesit e t\u00eb cil\u00ebve kan\u00eb arritur 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 bidhave t\u00eb ve\u00e7anta t\u00eb memorizimit p\u00ebrmes leximit t\u00eb cikluar t\u00eb t\u00eb dh\u00ebnave nga qeliza t\u00eb af\u00ebrta t\u00eb memorizimit. Duke qen\u00eb se memoria DRAM p\u00ebrb\u00ebhet nga nj\u00eb matrice dy-dimensionale e qelizave, secila prej t\u00eb cilave p\u00ebrb\u00ebhet nga nj\u00eb kondensator dhe nj\u00eb transistor, kryerja e leximeve t\u00eb vazhdueshme n\u00eb t\u00eb nj\u00ebjtin segment t\u00eb memorizimit \u00e7on n\u00eb ndryshime tensioni dhe anomalit\u00eb q\u00eb shkaktojn\u00eb humbje t\u00eb vogla t\u00eb ngarkes\u00ebs s\u00eb qelizave fqinje. N\u00ebse intensiteti i leximit \u00ebsht\u00eb mjaft i lart\u00eb, nj\u00eb qeliz\u00eb fqinje mund t\u00eb humbas\u00eb nj\u00eb volum t\u00eb konsideruesh\u00ebm ngarkese dhe cikli i ardhsh\u00ebm i rigjenerimit nuk do t\u00eb arrij\u00eb ta rikthej\u00eb n\u00eb gjendjen e saj fillestare, duke rezultuar n\u00eb ndryshimin e vlerave t\u00eb ruajta n\u00eb qeliza. <\/p>\n
P\u00ebr mbrojtjen nga RowHammer, prodhuesit e \u00e7ipave zbatuan mekanizmin TRR (Target Row Refresh), i cili mbron nga deformimi i qelizave n\u00eb rreshtat p\u00ebrreth. Metoda Half-Double lejon anashkalimin e k\u00ebsaj mbrojtjeje duke manipuluar faktin se deformimet nuk jan\u00eb t\u00eb kufizuara vet\u00ebm n\u00eb rreshtat p\u00ebrreth dhe p\u00ebrhapen n\u00eb rreshta t\u00eb tjer\u00eb t\u00eb memories, megjithat\u00eb n\u00eb nj\u00eb shkall\u00eb m\u00eb t\u00eb ul\u00ebt. Inxhinier\u00ebt e Google treguan se p\u00ebr rreshtat e memories \"A\", \"B\" dhe \"C\", \u00ebsht\u00eb e mundur t\u00eb sulmohet rreshti \"C\" gjat\u00eb nj\u00eb qasje mjaft intensive n\u00eb rreshtin \"A\" dhe nj\u00eb aktivitet t\u00eb vog\u00ebl q\u00eb prek rreshtin \"B\". Referencat n\u00eb rreshtin \"B\" gjat\u00eb sulmit aktivizojn\u00eb nj\u00eb rrjedhje jo-lineare t\u00eb ngarkesave dhe lejojn\u00eb p\u00ebrdorimin e rreshtit \"B\" si transport p\u00ebr t\u00eb transmetuar efektin Rowhammer nga rreshti \"A\" n\u00eb \"C\".
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Ndryshe nga sulmi TRRespass, i cili manipuluar me pap\u00ebrshtatshm\u00ebri n\u00eb implementime t\u00eb ndryshme t\u00eb mekanizmit t\u00eb mbrojtjes nga deformimi i qelizave, sulmi Half-Double bazohet n\u00eb prop\u00ebrtit\u00eb fizike t\u00eb substratit t\u00eb silikonit. Half-Double tregon se, n\u00eb t\u00eb v\u00ebrtet\u00eb, efektet q\u00eb mund t\u00eb \u00e7ojn\u00eb n\u00eb Rowhammer jan\u00eb nj\u00eb pron\u00eb e distanc\u00ebs, dhe jo e af\u00ebrsis\u00eb direkte t\u00eb qeliza. Me reduktimin e gjeometris\u00eb s\u00eb qelizave n\u00eb \u00e7ipat modern\u00eb, rritet gjithashtu dhe rrethi i ndikimit t\u00eb deformimeve. Nuk p\u00ebrjashtohet q\u00eb efekti t\u00eb v\u00ebrehet edhe n\u00eb distanca m\u00eb t\u00eb m\u00ebdha se dy rreshta. <\/p>\n
Evidentohet se s\u00eb bashku me asociacionin JEDEC jan\u00eb zhvilluar disa propozime me analiz\u00ebn e mund\u00ebsive p\u00ebr bllokimin e sulmeve t\u00eb tilla. Informacioni mbi metod\u00ebn \u00ebsht\u00eb zbuluar, pasi Google e konsideron se hulumtimi i kryer zgjeron ndjesh\u00ebm kuptimin e fenomenit Rowhammer dhe thekson r\u00ebnd\u00ebsin\u00eb e bashk\u00ebveprimit t\u00eb p\u00ebrpjekjeve t\u00eb shkenc\u00ebtar\u00ebve, prodhuesve t\u00eb \u00e7ipave dhe pal\u00ebve t\u00eb tjera t\u00eb interesuara n\u00eb zhvillimin e nj\u00eb zgjidhjeje t\u00eb plot\u00eb 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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