{"id":167488,"date":"2026-04-04T17:11:55","date_gmt":"2026-04-04T15:11:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ataki-gddrhammer-i-geforge-iskazhayushhie-pamyat-gpu-dlya-dostupa-ko-vsej-pamyati-cpu"},"modified":"2026-04-04T17:11:55","modified_gmt":"2026-04-04T15:11:56","slug":"ataki-gddrhammer-i-geforge-iskazhayushhie-pamyat-gpu-dlya-dostupa-ko-vsej-pamyati-cpu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataki-gddrhammer-i-geforge-iskazhayushhie-pamyat-gpu-dlya-dostupa-ko-vsej-pamyati-cpu","title":{"rendered":"Attacchi GDDRHammer e GeForge, che distorcono la memoria GPU per accedere all'intera memoria CPU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori di diverse universit\u00e0 negli Stati Uniti e in Australia hanno sviluppato due attacchi di tipo Rowhammer - GDDRHammer e GeForge, che permettono, eseguendo un kernel CUDA non privilegiato su GPU NVIDIA, di alterare singoli bit nella memoria video GDDR. A differenza del metodo GPUHammer presentato lo scorso anno, i nuovi attacchi non si limitano a influenzare i dati elaborati nella memoria GPU, ma consentono di accedere all'intera memoria principale relativa allo spazio indirizzabile della CPU. I ricercatori hanno dimostrato exploit che forniscono accesso root al sistema principale durante l'esecuzione di un kernel CUDA non privilegiato sulla GPU.    <\/p>\n<p>Entrambi gli attacchi provocano una prematura perdita di carica in determinate celle della memoria video, a cui gli aggressori non hanno accesso diretto, portando cos\u00ec a una modifica dei bit memorizzati in tali celle. La capacit\u00e0 di leggere e scrivere nella memoria relativa allo spazio di indirizzamento della CPU \u00e8 realizzata interferendo con il funzionamento dell'allocatore di memoria della GPU (cudaMalloc) per violare l'isolamento della memoria della GPU e mappare indirizzi virtuali della GPU a indirizzi fisici arbitrari della memoria della GPU o della CPU.      <\/p>\n<p>L'interferenza avviene attraverso la distorsione dei valori dei bit nella memoria video, in cui sono memorizzate le tabelle delle pagine della memoria GPU responsabili della traduzione degli indirizzi virtuali in fisici. Le differenze tra gli attacchi GDDRHammer e GeForge si riducono al fatto che il metodo GDDRHammer modifica la tabella delle pagine di ultimo livello (PT - Last Level Page Table), mentre il metodo GeForge modifica il catalogo delle pagine di ultimo livello (PD0 - Last Level Page Directory).     <\/p>\n<p>Tra l'altro, le tabelle di traduzione degli indirizzi sono utilizzate per organizzare l'accesso diretto della GPU alla memoria della CPU, quindi modificare un indirizzo nella tabella delle pagine della GPU in un indirizzo fisico nella memoria RAM principale e impostare il flag APERTURE, che abilita la modalit\u00e0 di mappatura della memoria della CPU, consente di leggere e scrivere dati accedendo alla memoria principale tramite il bus PCIe con IOMMU disabilitato (disattivato di default).    <center><img decoding=\"async\" alt=\"Attacchi GDDRHammer e GeForge, che distorcono la memoria GPU per accedere all&#039;intera memoria CPU\" src=\"\/wp-content\/uploads\/2026\/04\/cf6d67b627148fba008ba487490a3f2a.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <center><img decoding=\"async\" alt=\"Attacchi GDDRHammer e GeForge, che distorcono la memoria GPU per accedere all&#039;intera memoria CPU\" src=\"\/wp-content\/uploads\/2026\/04\/1c2d3baaf4fdf80c88dfdeb3bcb1993f.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Gli attacchi di successo sono stati dimostrati su schede grafiche professionali NVIDIA RTX A6000 basate sull'architettura Ampere (il costo delle nuove schede parte da $6850, mentre quelle usate partono da $4000) e su modelli consumer NVIDIA RTX 3060 ($250-300). La tecnica di bypass delle protezioni Rowhammer sviluppata, combinata con l'utilizzo delle risorse di parallelizzazione fornite dalla GPU, ha permesso di aumentare la frequenza di occorrenza delle distorsioni delle celle di 64 volte rispetto agli attacchi precedenti. Come misura temporanea per bloccare gli attacchi, il comando 'nvidia-smi -e 1' pu\u00f2 attivare la modalit\u00e0 di correzione degli errori ECC (Error Correcting Codes), ma questo comporta costi aggiuntivi e pu\u00f2 potenzialmente essere eluso utilizzando metodi di attacco come ECCploit ed ECC.fail.            <center>  <video controls=\"\" style=\"width: 700px; height: 400px; max-width:100%\"><source src=\"https:\/\/gddr.fail\/files\/geforge-demo.mp4\" type=\"video\/mp4\"><\/video>  <\/center>      <\/p>\n<p>L'attacco RowHammer consente di alterare il contenuto di singoli bit di memoria DRAM attraverso la lettura ciclica dei dati dalle celle di memoria adiacenti. Poich\u00e9 la memoria DRAM \u00e8 costituita da un array bidimensionale di celle, ognuna delle quali \u00e8 composta da un condensatore e un transistor, la lettura continua della stessa area di memoria provoca fluttuazioni di tensione e anomalie che possono causare una leggera perdita di carica nelle celle vicine. Se l'intensit\u00e0 di lettura \u00e8 elevata, una cella adiacente pu\u00f2 perdere una quantit\u00e0 sufficiente di carica e il successivo ciclo di rigenerazione potrebbe non riuscire a ripristinare il suo stato originale, portando a una modifica del valore dei dati memorizzati nella cella.         <\/p>\n<p>Il metodo di attacco Rowhammer \u00e8 stato proposto nel 2014, dopo di che \u00e8 iniziato un gioco del gatto col topo tra i ricercatori di sicurezza e i produttori di hardware: i produttori di chip di memoria tentavano di bloccare la vulnerabilit\u00e0, mentre i ricercatori trovavano nuovi modi per eluderla. Ad esempio, per proteggere contro il RowHammer, i produttori di chip hanno aggiunto meccanismi TRR (Target Row Refresh), ma si \u00e8 scoperto che essi bloccano la distorsione delle celle solo in casi specifici e non proteggono da tutte le possibili varianti di attacco. Le tecniche di attacco sono state sviluppate per chip DDR3, DDR4 e DDR5 su sistemi con processori Intel, AMD e ARM, cos\u00ec come per la memoria GDDR delle GPU NVIDIA. Inoltre, sono stati trovati modi per eludere la correzione degli errori ECC e sono state proposte varianti per eseguire attacchi attraverso reti e tramite esecuzione di codice JavaScript nei browser.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65141\">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 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 \u0421\u0428\u0410 \u0438 \u0410\u0432\u0441\u0442\u0440\u0430\u043b\u0438\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u0434\u0432\u0435 \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer &#8212; GDDRHammer \u0438 GeForge, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u044f\u0434\u0440\u0430 CUDA \u043d\u0430 GPU NVIDIA \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u0438\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u0432 \u0447\u0438\u043f\u0430\u0445 \u0432\u0438\u0434\u0435\u043e\u043f\u0430\u043c\u044f\u0442\u0438 GDDR. \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0433\u043e\u0434\u0443 \u043c\u0435\u0442\u043e\u0434\u0430 GPUHammer, \u043d\u043e\u0432\u044b\u0435 \u0430\u0442\u0430\u043a\u0438 \u043d\u0435 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0430 \u0434\u0430\u043d\u043d\u044b\u0435, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 GPU, \u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":167489,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-167488","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 - 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GDDRHammer \u0438 GeForge, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u044f\u0434\u0440\u0430 CUDA \u043d\u0430 GPU NVIDIA \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u0438\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u0432 \u0447\u0438\u043f\u0430\u0445 \u0432\u0438\u0434\u0435\u043e\u043f\u0430\u043c\u044f\u0442\u0438 GDDR. \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0433\u043e\u0434\u0443 \u043c\u0435\u0442\u043e\u0434\u0430 GPUHammer, \u043d\u043e\u0432\u044b\u0435 \u0430\u0442\u0430\u043a\u0438 \u043d\u0435 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0430 \u0434\u0430\u043d\u043d\u044b\u0435, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 GPU, \u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataki-gddrhammer-i-geforge-iskazhayushhie-pamyat-gpu-dlya-dostupa-ko-vsej-pamyati-cpu\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-04-04T15:11:56+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-04-04T15:11:56+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Attacchi GDDRHammer e GeForge che distorcono la memoria GPU per accedere a tutta la memoria della CPU | ProHoster","description":"I ricercatori di diverse universit\u00e0 degli Stati Uniti e dell'Australia hanno sviluppato due attacchi di tipo Rowhammer - GDDRHammer e GeForge, che permettono, eseguendo un nucleo CUDA non privilegiato su GPU NVIDIA, di alterare singoli bit nei chip di memoria video GDDR. A differenza del metodo GPUHammer presentato lo scorso anno, i nuovi attacchi non si limitano a influenzare i dati elaborati nella memoria della GPU, ma consentono","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataki-gddrhammer-i-geforge-iskazhayushhie-pamyat-gpu-dlya-dostupa-ko-vsej-pamyati-cpu","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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\u0410\u0442\u0430\u043a\u0438 GDDRHammer \u0438 GeForge, \u0438\u0441\u043a\u0430\u0436\u0430\u044e\u0449\u0438\u0435 \u043f\u0430\u043c\u044f\u0442\u044c GPU \u0434\u043b\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a\u043e \u0432\u0441\u0435\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 CPU | ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 \u0421\u0428\u0410 \u0438 \u0410\u0432\u0441\u0442\u0440\u0430\u043b\u0438\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u0434\u0432\u0435 \u0430\u0442\u0430\u043a\u0438 \u043a\u043b\u0430\u0441\u0441\u0430 Rowhammer - GDDRHammer \u0438 GeForge, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u044f\u0434\u0440\u0430 CUDA \u043d\u0430 GPU NVIDIA \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u0438\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0431\u0438\u0442\u043e\u0432 \u0432 \u0447\u0438\u043f\u0430\u0445 \u0432\u0438\u0434\u0435\u043e\u043f\u0430\u043c\u044f\u0442\u0438 GDDR. \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0433\u043e\u0434\u0443 \u043c\u0435\u0442\u043e\u0434\u0430 GPUHammer, \u043d\u043e\u0432\u044b\u0435 \u0430\u0442\u0430\u043a\u0438 \u043d\u0435 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0430 \u0434\u0430\u043d\u043d\u044b\u0435, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 GPU, \u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442","og:url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/ataki-gddrhammer-i-geforge-iskazhayushhie-pamyat-gpu-dlya-dostupa-ko-vsej-pamyati-cpu","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-04-04T15:11:56+00:00","article:modified_time":"2026-04-04T15:11:56+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/167488","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/comments?post=167488"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/167488\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/media\/167489"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/media?parent=167488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/categories?post=167488"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/tags?post=167488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}