{"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\/it\/blog\/news\/predstavleny-patchi-dlya-randomizaczii-adresov-steka-yadra-linux-pri-sistemnyh-vyzovah","title":{"rendered":"Sono stati presentati patch per la randomizzazione degli indirizzi dello stack del kernel Linux durante le chiamate di sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kees Cook, ex amministratore di sistema capo di kernel.org e leader del Team di Sicurezza di Ubuntu, attualmente in Google per garantire la protezione di Android e ChromeOS, ha pubblicato un insieme di patch con l'implementazione della randomizzazione degli offset nello stack del kernel durante l'elaborazione delle chiamate di sistema. Le patch aumentano la sicurezza del kernel modificando il posizionamento dello stack, rendendo gli attacchi allo stack significativamente pi\u00f9 complessi e meno riusciti. L'implementazione iniziale supporta i processori ARM64 e x86\/x86_64. <\/p>\n

\u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u0430\u044f \u0438\u0434\u0435\u044f \u043f\u0430\u0442\u0447\u0430 \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0438\u0442 \u043f\u0440\u043e\u0435\u043a\u0442\u0443 PaX RANDKSTACK. \u0412 2019 \u0433\u043e\u0434\u0443 \u0415\u043b\u0435\u043d\u0430 \u0420\u0435\u0448\u0435\u0442\u043e\u0432\u0430, \u0438\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u0444\u0438\u0440\u043c\u044b Intel, \u043f\u043e\u043f\u0440\u043e\u0431\u043e\u0432\u0430\u043b\u0430 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0434\u0430\u043d\u043d\u043e\u0439 \u0438\u0434\u0435\u0438, \u043f\u0440\u0438\u0433\u043e\u0434\u043d\u0443\u044e \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux. \u041f\u043e\u0437\u0436\u0435 \u0438\u043d\u0438\u0446\u0438\u0430\u0442\u0438\u0432\u0443 \u043f\u043e\u0434\u0445\u0432\u0430\u0442\u0438\u043b \u041a\u0438\u0441 \u041a\u0443\u043a, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u043f\u0440\u0438\u0433\u043e\u0434\u043d\u0443\u044e \u0434\u043b\u044f \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430 \u044f\u0434\u0440\u0430. \u041f\u0430\u0442\u0447\u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 5.13. \u0420\u0435\u0436\u0438\u043c \u0431\u0443\u0434\u0435\u0442 \u043e\u0442\u043a\u043b\u044e\u0447\u0451\u043d \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u044b \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u044f\u0434\u0440\u0430 «randomize_kstack_offset=on\/off» \u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT. \u041d\u0430\u043a\u043b\u0430\u0434\u043d\u044b\u0435 \u0440\u0430\u0441\u0445\u043e\u0434\u044b \u043f\u0440\u0438 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u0440\u0435\u0436\u0438\u043c\u0430 \u043e\u0446\u0435\u043d\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u043f\u0440\u0438\u0431\u043b\u0438\u0437\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0432 1% \u043f\u043e\u0442\u0435\u0440\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438. <\/p>\n

Il cuore della protezione proposta risiede nella scelta di un offset casuale dello stack ad ogni chiamata di sistema, il che complica la determinazione del layout dello stack in memoria, anche ottenendo dati sugli indirizzi, poich\u00e9 alla successiva chiamata di sistema l'indirizzo base dello stack cambier\u00e0. A differenza dell'implementazione PaX RANDKSTACK, nelle patch proposte per l'inclusione nel kernel, la randomizzazione avviene non nella fase iniziale (cpu_current_top_of_stack), ma dopo l'impostazione della struttura pt_regs, il che rende impossibile l'uso di metodi basati su ptrace per determinare l'offset randomizzato durante l'esecuzione di una chiamata di sistema a lungo termine.
\n
Fonte: 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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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-99808","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\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\udd47Sono stati presentati patch per la randomizzazione degli indirizzi dello stack del kernel Linux durante le chiamate di sistema | ProHoster","description":"Kees Cook, ex amministratore di sistema capo di kernel.org e leader del Team di Sicurezza di Ubuntu, attualmente in Google per garantire la protezione di Android e ChromeOS, ha pubblicato un insieme di patch con l'implementazione della 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