{"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\/hr\/blog\/news\/predstavleny-patchi-dlya-randomizaczii-adresov-steka-yadra-linux-pri-sistemnyh-vyzovah","title":{"rendered":"Predstavljeni popravci za nasumi\u010dno adresiranje stoga jezgre Linuxa prilikom sistemskih poziva","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kees Cook, biv\u0161i glavni sysadmin kernel.org i vo\u0111a Ubuntu Security Team, trenutno zaposlen u Googleu, gdje radi na sigurnosti Androida i ChromeOS-a, objavio je skup zakrpa koje implementiraju randomizaciju pomaka na stogu jezgre prilikom obrade sistemskih poziva. Zakrpe pove\u0107avaju sigurnost jezgre promjenom rasporeda stoga, \u0161to zna\u010dajno ote\u017eava uspje\u0161ne napade na stog. Po\u010detna implementacija podr\u017eava ARM64 i x86\/x86_64 procesore. <\/p>\n

Izvorna ideja o zakrpi pripada projektu PaX RANDKSTACK. Godine 2019. Elena Re\u0161etova, in\u017eenjerka iz firme Intel, poku\u0161ala je stvoriti implementaciju ove ideje pogodnu za uklju\u010divanje u glavni kernel Linuxa. Kasnije je inicijativu preuzeo Kis Kuk, koji je predstavio implementaciju pogodnu za glavni kernel. Zakrpe se planiraju uklju\u010diti u verziju 5.13. Mod \u0107e biti isklju\u010den prema zadanim postavkama. Za uklju\u010divanje su predlo\u017eeni parametar naredbenog retka kernela \"randomize_kstack_offset=on\/off\" i postavka CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT. Tro\u0161kovi prilikom uklju\u010divanja moda procjenjuju se na otprilike 1% gubitka performansi. <\/p>\n

Su\u0161tina predlo\u017eene za\u0161tite je odabir slu\u010dajnog pomaka stoga pri svakom sistemskom pozivu, \u0161to ote\u017eava odre\u0111ivanje rasporeda stoga u memoriji, \u010dak i kada se dobiju podaci o adresama, jer \u0107e se pri sljede\u0107em sistemskom pozivu osnovna adresa stoga promijeniti. Za razliku od implementacije PaX RANDKSTACK, u zakrpama predlo\u017eenim za uklju\u010divanje u jezgru, randomizacija se ne vr\u0161i u po\u010detnoj fazi (cpu_current_top_of_stack), ve\u0107 nakon postavljanja strukture pt_regs, \u0161to onemogu\u0107ava kori\u0161tenje metoda temeljenih na ptrace za odre\u0111ivanje randomiziranog pomaka tokom rada dugotrajnih sistemskih poziva.
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u0438\u0441 \u041a\u0443\u043a (Kees Cook), \u0431\u044b\u0432\u0448\u0438\u0439 \u0433\u043b\u0430\u0432\u043d\u044b\u0439 \u0441\u0438\u0441\u0430\u0434\u043c\u0438\u043d kernel.org \u0438 \u043b\u0438\u0434\u0435\u0440 Ubuntu Security Team, \u043d\u044b\u043d\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0439 \u0432 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043d\u0430\u0434 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u0435\u043c \u0437\u0430\u0449\u0438\u0442\u044b Android \u0438 ChromeOS, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0440\u0430\u043d\u0434\u043e\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043c\u0435\u0449\u0435\u043d\u0438\u0439 \u0432 \u0441\u0442\u044d\u043a\u0435 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 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