{"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\/cs\/blog\/news\/bypassing-memory-isolation-on-amd-cpu-systems-via-memory-controller-manipulation","title":{"rendered":"Obch\u00e1zen\u00ed izolace pam\u011bti na syst\u00e9mech s CPU AMD prost\u0159ednictv\u00edm manipulace s pam\u011b\u0165ov\u00fdm kontrol\u00e9rem","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Na konferenci Black Hat 2026 byla p\u0159edvedena metoda \u00fatoku, kter\u00e1 vyu\u017e\u00edv\u00e1 swizzle re\u017eim pam\u011b\u0165ov\u00fdch kontroler\u016f AMD k obch\u00e1zen\u00ed izolace pam\u011bti a \u010dten\u00ed \u010di z\u00e1pisu libovoln\u00fdch dat z pam\u011bti, v\u010detn\u011b oblast\u00ed s mikroprogramem CPU a pam\u011bti p\u0159id\u011blen\u00e9 PSP procesoru (Platform Security Processor). Tato metoda umo\u017e\u0148uje obch\u00e1zet vestav\u011bn\u00e9 mechanismy \u0161ifrov\u00e1n\u00ed pam\u011bti (AMD SME\/SEV), naru\u0161it izolaci virtu\u00e1ln\u00edch stroj\u016f a p\u0159epsat mikroprogram procesoru. K manipulaci s pam\u011b\u0165ov\u00fdm kontrolerem je vy\u017eadov\u00e1no proveden\u00ed k\u00f3du na \u00farovni j\u00e1dra, co\u017e sni\u017euje nebezpe\u010d\u00ed t\u00e9to techniky \u00fatoku. <\/p>\n

Re\u017eim \u201eswizzle\u201c m\u011bn\u00ed logiku adresov\u00e1n\u00ed opera\u010dn\u00ed pam\u011bti, aby se vylou\u010dily konflikty, kter\u00e9 vznikaj\u00ed p\u0159i sekven\u010dn\u00edm p\u0159\u00edstupu, k n\u011bmu\u017e doch\u00e1z\u00ed p\u0159i \u010dten\u00ed z r\u016fzn\u00fdch \u0159ad v jedn\u00e9 pam\u011b\u0165ov\u00e9 bance. Aby se t\u011bmto konflikt\u016fm v re\u017eimu \u201eswizzle\u201c zabr\u00e1nilo, \u0159adi\u010d aplikuje operaci XOR na \u010d\u00e1st bit\u016f adresy, aby rozd\u011blil sekven\u010dn\u011b jdouc\u00ed datov\u00e9 bloky mezi r\u016fzn\u00fdmi pam\u011b\u0165ov\u00fdmi bankami. \u00datok spo\u010d\u00edv\u00e1 v manipulaci s re\u017eimem \u201eswizzle\u201c na b\u011b\u017e\u00edc\u00edm syst\u00e9mu pro redistribuci fyzick\u00fdch adres za b\u011bhu. <\/p>\n

Prototyp \u00fatoku byl demonstrov\u00e1n na procesorech AMD rodiny 16h, pou\u017e\u00edvan\u00fdch v konzol\u00edch PS4 a Xbox One, kde byly registre konfigurace adresace pam\u011b\u0165ov\u00e9ho kontroleru dokumentov\u00e1ny a chyb\u011bl mechanismus jejich blokace po spu\u0161t\u011bn\u00ed syst\u00e9mu. U procesor\u016f AMD rodiny 17h a nov\u011bj\u0161\u00edch (po\u010d\u00ednaje Zen) spole\u010dnost AMD implementovala mechanismus blokace p\u0159\u00edstupu k registr\u016fm konfigurace pam\u011b\u0165ov\u00e9ho kontroleru, a tak\u00e9 p\u0159idala ochranu proti fal\u0161ov\u00e1n\u00ed kopie mikroprogramu, kter\u00fd se ukl\u00e1d\u00e1 do opera\u010dn\u00ed pam\u011bti b\u011bhem p\u0159echodu procesoru do sp\u00e1nkov\u00e9ho re\u017eimu (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 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