{"id":99808,"date":"2021-04-15T10:22:45","date_gmt":"2021-04-15T08:22:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predstavleny-patchi-dlya-randomizaczii-adresov-steka-yadra-linux-pri-sistemnyh-vyzovah"},"modified":"2021-04-15T10:22:45","modified_gmt":"2021-04-15T08:22:45","slug":"predstavleny-patchi-dlya-randomizaczii-adresov-steka-yadra-linux-pri-sistemnyh-vyzovah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/predstavleny-patchi-dlya-randomizaczii-adresov-steka-yadra-linux-pri-sistemnyh-vyzovah","title":{"rendered":"Zaprezentowano poprawki do randomizacji adres\u00f3w stosu j\u0105dra Linux podczas wywo\u0142a\u0144 systemowych","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kees Cook, by\u0142y g\u0142\u00f3wny administrator system\u00f3w kernel.org i szef Ubuntu Security Team, obecnie pracuj\u0105cy w Google nad zabezpieczeniami Androida i ChromeOS, opublikowa\u0142 zestaw poprawek implementuj\u0105cych randomizacj\u0119 przesuni\u0119\u0107 stosu j\u0105dra podczas obs\u0142ugi wywo\u0142a\u0144 systemowych. Poprawki zwi\u0119kszaj\u0105 bezpiecze\u0144stwo j\u0105dra poprzez zmian\u0119 rozmieszczenia stosu, co znacznie utrudnia ataki na stos i obni\u017ca ich skuteczno\u015b\u0107. Pocz\u0105tkowa implementacja obs\u0142uguje procesory ARM64 oraz x86\/x86_64. <\/p>\n

Pocz\u0105tkowa idea \u0142atki nale\u017cy do projektu PaX RANDKSTACK. W 2019 roku Elena Reshetova, in\u017cynier z firmy Intel, spr\u00f3bowa\u0142a stworzy\u0107 implementacj\u0119 tego pomys\u0142u, nadaj\u0105c\u0105 si\u0119 do w\u0142\u0105czenia do g\u0142\u00f3wnego sk\u0142adu j\u0105dra Linux. P\u00f3\u017aniej inicjatyw\u0119 przej\u0105\u0142 Kys Cook, kt\u00f3ry przedstawi\u0142 implementacj\u0119 odpowiedni\u0105 dla g\u0142\u00f3wnej wersji j\u0105dra. \u0141atki planuje si\u0119 w\u0142\u0105czy\u0107 w wydaniu 5.13. Tryb b\u0119dzie domy\u015blnie wy\u0142\u0105czony. Aby go w\u0142\u0105czy\u0107, zaproponowano parametr linii polece\u0144 j\u0105dra \u201erandomize_kstack_offset=on\/off\u201d oraz ustawienie CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT. Koszty dodatkowe przy w\u0142\u0105czeniu trybu szacowane s\u0105 na oko\u0142o 1% utraty wydajno\u015bci. <\/p>\n

Istota proponowanego zabezpieczenia polega na wybieraniu losowego przesuni\u0119cia stosu przy ka\u017cdym wywo\u0142aniu systemowym, co utrudnia okre\u015blenie uk\u0142adu stosu w pami\u0119ci, nawet po uzyskaniu danych o adresach, poniewa\u017c przy kolejnym wywo\u0142aniu systemowym bazowy adres stosu si\u0119 zmieni. W przeciwie\u0144stwie do implementacji PaX RANDKSTACK, w poprawkach proponowanych do w\u0142\u0105czenia do j\u0105dra randomizacja wykonywana jest nie na pocz\u0105tkowym etapie (cpu_current_top_of_stack), lecz po ustawieniu struktury pt_regs, co uniemo\u017cliwia wykorzystanie metod opartych na ptrace do okre\u015blenia zrandomizowanego przesuni\u0119cia w trakcie dzia\u0142ania d\u0142ugotrwale wykonywanego wywo\u0142ania systemowego.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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