{"id":182995,"date":"2026-08-14T10:53:40","date_gmt":"2026-08-14T08:53:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/obhod-izolyaczii-pamyati-na-sistemah-s-cpu-amd-cherez-manipulyaczii-s-kontrollerom-pamyati"},"modified":"2026-08-14T10:53:42","modified_gmt":"2026-08-14T08:53:42","slug":"bypassing-memory-isolation-on-amd-cpu-systems-via-memory-controller-manipulation","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/bypassing-memory-isolation-on-amd-cpu-systems-via-memory-controller-manipulation","title":{"rendered":"Obch\u00e1dzanie izol\u00e1cie pam\u00e4te na syst\u00e9moch s CPU AMD prostredn\u00edctvom manipul\u00e1cie s pam\u00e4\u0165ov\u00fdm kontrol\u00f3rom","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Na konferencii Black Hat 2026 bol predveden\u00fd \u00fatok, ktor\u00fd vyu\u017e\u00edva swizzle re\u017eim pam\u00e4\u0165ov\u00fdch kontrol\u00e9rov AMD na ob\u00eddenie izol\u00e1cie pam\u00e4te a \u010d\u00edtanie alebo z\u00e1pis n\u00e1hodn\u00fdch \u00fadajov z pam\u00e4te, vr\u00e1tane oblast\u00ed s mikrok\u00f3dom CPU a pam\u00e4te pridelen\u00e9 procesoru PSP (Platform Security Processor). Met\u00f3da umo\u017e\u0148uje ob\u00eds\u0165 zabudovan\u00e9 mechanizmy \u0161ifrovania pam\u00e4te (AMD SME\/SEV), naru\u0161i\u0165 izol\u00e1ciu virtu\u00e1lnych strojov a prep\u00edsa\u0165 mikrok\u00f3d procesora. Na manipul\u00e1ciu s pam\u00e4\u0165ov\u00fdm kontrol\u00e9rom je potrebn\u00e9 vykonanie k\u00f3du na \u00farovni jadra, \u010do zni\u017euje nebezpe\u010denstvo predlo\u017eenej techniky \u00fatoku. <\/p>\n

Re\u017eim «swizzle» men\u00ed logiku adresovania opera\u010dnej pam\u00e4te, aby sa predi\u0161lo konfliktom, ktor\u00e9 vznikaj\u00fa pri sekven\u010dnom pr\u00edstupe, ke\u010f sa \u010d\u00edta z r\u00f4znych riadkov v jednom banku pam\u00e4te. Na vyl\u00fa\u010denie tak\u00fdchto konfliktov v re\u017eime «swizzle» riadi\u010d aplikuje oper\u00e1ciu XOR na \u010das\u0165 bitov adresy, aby rozdelil sekven\u010dne id\u00face bloky \u00fadajov medzi r\u00f4zne banky pam\u00e4te. \u00datok spo\u010d\u00edva v manipul\u00e1ci\u00e1ch s re\u017eimom «swizzle» na funguj\u00facom syst\u00e9me pre dynamick\u00e9 prerozde\u013eovanie fyzick\u00fdch adries. <\/p>\n

Prototyp \u00fatoku bol demon\u0161trovan\u00fd na procesoroch AMD rodiny 16h, ktor\u00e9 boli pou\u017e\u00edvan\u00e9 v konzol\u00e1ch PS4 a Xbox One, kde boli registre konfigur\u00e1cie adresovania pam\u00e4\u0165ov\u00e9ho kontrol\u00e9ra zdokumentovan\u00e9 a po na\u010d\u00edtan\u00ed syst\u00e9mu ch\u00fdbal mechanizmus ich zablokovania. V procesoroch AMD rodiny 17h a nov\u0161\u00edch (za\u010d\u00ednaj\u00fac Zen) spolo\u010dnos\u0165 AMD implementovala mechanizmus blokovania pr\u00edstupu k registr\u00e1m konfigur\u00e1cie pam\u00e4\u0165ov\u00e9ho kontrol\u00e9ra a pridala ochranu pred podvodom s k\u00f3piou mikrok\u00f3du, ktor\u00e1 sa resetuje do opera\u010dnej pam\u00e4te po\u010das prechodu procesora do re\u017eimu sp\u00e1nku (C6).
\n
Zdroj: 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 Black Hat 2026 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0439 swizzle-\u0440\u0435\u0436\u0438\u043c \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u043e\u0432 \u043f\u0430\u043c\u044f\u0442\u0438 AMD \u0434\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u0438 \u0447\u0442\u0435\u043d\u0438\u044f \u0438\u043b\u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u043f\u0430\u043c\u044f\u0442\u0438, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u0441 \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u0434\u043e\u043c CPU \u0438 \u043f\u0430\u043c\u044f\u0442\u044c, \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u0443\u044e PSP-\u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0443 (Platform Security Processor). \u041c\u0435\u0442\u043e\u0434 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0431\u043e\u0439\u0442\u0438 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0435 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u044b \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 (AMD SME\/SEV), \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u044c \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d \u0438 \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u0434 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430. \u0414\u043b\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182995","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\n","aioseo_head_json":{"title":"\ud83e\udd47Ob\u00eddenie izol\u00e1cie pam\u00e4te na syst\u00e9moch s CPU AMD prostredn\u00edctvom manipul\u00e1ci\u00ed s pam\u00e4\u0165ov\u00fdm kontrol\u00e9rom | ProHoster","description":"Na konferencii Black Hat 2026 bol predveden\u00fd \u00fatok, ktor\u00fd vyu\u017e\u00edva swizzle re\u017eim pam\u00e4\u0165ov\u00fdch kontrol\u00e9rov AMD na 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