{"id":138938,"date":"2025-07-14T11:11:58","date_gmt":"2025-07-14T09:11:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/gpuhammer-variant-ataki-rowhammer-na-pamyat-gpu"},"modified":"2025-07-14T11:11:58","modified_gmt":"2025-07-14T09:11:59","slug":"gpuhammer-variant-ataki-rowhammer-na-pamyat-gpu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/gpuhammer-variant-ataki-rowhammer-na-pamyat-gpu","title":{"rendered":"GPUHammer \u2014 Rowhammeri r\u00fcnnak variant GPU m\u00e4lule","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Toronto \u00dclikooli teadlased esitasid esmakordselt Rowhammeri r\u00fcnnaku, mis on suunatud videom\u00e4lu sisu moonutamisele. R\u00fcnnaku v\u00f5imalus, mis v\u00f5imaldab asendada kuni 8 biti andmeid, demonstreeriti NVIDIA A6000 diskreetse GPU puhul, millel on GDDR6 videom\u00e4lu. Praktilise n\u00e4itena n\u00e4idatakse, kuidas sellist moonutust saab kasutada masin\u00f5ppemudelite t\u00e4itmise sekkumiseks ja tulemuste t\u00e4psuse m\u00e4rkimisv\u00e4\u00e4rseks (80%-lt kuni 0,1%-ni) v\u00e4henemiseks, muutes vaid \u00fche biti v\u00e4\u00e4rtust.     <center><img decoding=\"async\" alt=\"GPUHammer - Rowhammeri variant GPU m\u00e4lule\" src=\"\/wp-content\/uploads\/2025\/07\/335fc84ff4fcbe5d01f91b5c3084481e.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Kuni t\u00e4naseni oli Rowhammeri r\u00fcnnakute loomine videom\u00e4lu jaoks keeruline, kuna selle f\u00fc\u00fcsilise paigutuse m\u00e4\u00e4ramine GDDR kiipides on keeruline, m\u00e4lu juurdep\u00e4\u00e4su viivitused on 4 korda pikemad ning m\u00e4lu v\u00e4rskendussagedus on k\u00f5rgem. Lisaks takistas katsete l\u00e4bi viimist GDDR kiipides sisseehitatud patenteeritud kaitses\u00fcsteemid, mis takistavad laadimise enneaegset kadu, mist\u00f5ttu nende anal\u00fc\u00fcsimiseks oli vajalik luua spetsiaalseid FPGA-p\u00f5hiseid katseplatvorme.       <\/p>\n<p>Uue GDDR DRAM-i tagasip\u00f6\u00f6rdumise inseneritehnika on v\u00e4lja t\u00f6\u00f6tatud videom\u00e4lu uurimiseks, kasutades r\u00fcnnaku k\u00e4igus m\u00e4lu optimeerimise tehnikaid, mis on kavandatud paralleelsete arvutuste korraldamiseks, et suurendada juurdep\u00e4\u00e4su intensiivsust \u00fcksikutele m\u00e4lurakkudele. NVIDIA GPU r\u00fcnnaku l\u00e4biviimiseks kasutati madala taseme CUDA koodi.     <\/p>\n<p>CUDA kasutajakoodeks ei tee f\u00fc\u00fcsilisi m\u00e4luaadresse, kuid NVIDIA draiveris peegeldati virtuaalset m\u00e4lu \u00fchte ja samasse f\u00fc\u00fcsilisse m\u00e4llu, mida uurijad kasutasid virtuaalse m\u00e4lu nihke arvutamiseks ja m\u00e4lupankade jaotuse m\u00e4\u00e4ramiseks. Erinevatesse m\u00e4lupankadesse tehtud p\u00e4ringute tuvastamine toimus viivituste anal\u00fc\u00fcsi kaudu, mis erines p\u00e4ringute puhul \u00fche v\u00f5i erinevate m\u00e4lupankade juurde.      <\/p>\n<p>GPU-sid \u00fchiselt kasutavates s\u00fcsteemides, nagu <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/\"   title=\"serverid\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1982\">serverid<\/a> masin\u00f5ppe mudelite t\u00e4itmiseks v\u00f5imaldab r\u00fcnnak \u00fchel kasutajal muuta teise kasutaja andmetega videom\u00e4lu sisu. Kaitsemeetmena soovitab ettev\u00f5te NVIDIA sisse l\u00fclitada vigade parandamise koodid (ECC, Error Correction Codes) k\u00e4suga &#171;nvidia-smi -e 1&#187; v\u00f5i kasutada videokaardisarju, mis toetavad OD-ECC (On-Die ECC), nagu GeForce RTX 50, RTX PRO, GB200, B200, B100, H100, H200, H20 ja GH200.    <\/p>\n<p>Uuringute kohaselt toob ECC aktiveerimine A6000 GPUdega s\u00fcsteemides masin\u00f5ppe mudelite t\u00e4itmise efektiivsuse v\u00e4henemise ligikaudu 10% ja m\u00e4lumahtude v\u00e4henemise 6.25%. R\u00fcnnaku l\u00e4biviimiseks ja GPU NVIDIA s\u00fcsteemide madalama taseme videom\u00e4lu paigutuse tagasiv\u00f5tmise t\u00f6\u00f6riistade komplekt on avaldatud GitHubis.      <\/p>\n<p>RowHammeri r\u00fcnnak v\u00f5imaldab rikutud DRAMi m\u00e4lu \u00fcksikute bittide sisu, lugedes andmeid pidevalt naaberm\u00e4lu rakkudest. DRAM m\u00e4lu on kahem\u00f5\u00f5tmeline rakkude massiiv, kus iga rakk koosneb kondensaatorist ja transistorist. \u00dche ja sama m\u00e4luala pidev lugemine p\u00f5hjustab pingefluktuatsioone ja anomaaliaid, mis p\u00f5hjustavad naaberakkude v\u00e4ikest laengukaotust. Kui lugemise intensiivsus on k\u00f5rge, v\u00f5ib naaberakk kaotada piisavalt suures koguses laengut, nii et j\u00e4rgmine regenereerimise ts\u00fckkel ei suuda taastada selle algset olekut, mis viib talletatud andmete muutumiseni.         <\/p>\n<p>Rowhammer r\u00fcnnakumeetod pakuti v\u00e4lja 2014. aastal, mille j\u00e4rel algas turvauuringute ja riistvara tootjate vahel m\u00e4ng &#171;kasutajate ja tootjate vahel&#187; &#8212; m\u00e4chipitootjad p\u00fc\u00fcdsid haavatavust blokeerida, samas kui teadlased leidsid uusi viise selle \u00fcmbers\u00f5itmiseks. N\u00e4iteks kaitseks RowHammeri vastu on m\u00e4chipitootjad lisanud mehhanismi TRR (Target Row Refresh), kuid selgus, et see blokeerib rakkude moonutamise vaid teatud juhtudel, kuid ei kaitse k\u00f5igi r\u00fcnnakuv\u00f5imaluste eest. R\u00fcnnakumeetodeid on arendatud DDR3, DDR4 ja DDR5 kiipidele s\u00fcsteemides, kus on Intel, AMD ja ARM protsessorid. Samuti on leitud viise vigade parandamise ECC \u00fcmbers\u00f5itmiseks ning pakutud v\u00f5imalusi r\u00fcnnakuks v\u00f5rgu kaudu ja JavaScripti koodi t\u00e4itmise kaudu brauseris.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63575\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0423\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0422\u043e\u0440\u043e\u043d\u0442\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043f\u0435\u0440\u0432\u0443\u044e \u0430\u0442\u0430\u043a\u0443 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u0443\u044e \u0434\u043b\u044f \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u0438\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0432\u0438\u0434\u0435\u043e\u043f\u0430\u043c\u044f\u0442\u0438. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0439 \u043a \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0435 \u0434\u043e 8 \u0431\u0438\u0442 \u0434\u0430\u043d\u043d\u044b\u0445, \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u0434\u0438\u0441\u043a\u0440\u0435\u0442\u043d\u043e\u043c GPU NVIDIA A6000 \u0441 \u0432\u0438\u0434\u0435\u043e\u043f\u0430\u043c\u044f\u0442\u044c\u044e GDDR6. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u043e \u043a\u0430\u043a \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u0435 \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u0432\u043c\u0435\u0448\u0430\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430 \u0432 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043c\u043e\u0434\u0435\u043b\u0435\u0439 \u043c\u0430\u0448\u0438\u043d\u043d\u043e\u0433\u043e \u043e\u0431\u0443\u0447\u0435\u043d\u0438\u044f \u0438 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e (\u0441 80% \u0434\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":138939,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-138938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0423\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0422\u043e\u0440\u043e\u043d\u0442\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043f\u0435\u0440\u0432\u0443\u044e \u0430\u0442\u0430\u043a\u0443 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer, 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R\u00fcnnaku v\u00f5imalus, mis v\u00f5imaldab asendada kuni 8 bitti andmeid, demonstreeriti NVIDIA A6000 diskreetse GPU puhul, millel on GDDR6 m\u00e4lu. 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