{"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\/ro\/blog\/news\/predstavleny-patchi-dlya-randomizaczii-adresov-steka-yadra-linux-pri-sistemnyh-vyzovah","title":{"rendered":"Patch-uri pentru randomizarea adreselor stivei nucleului Linux \u00een timpul apelurilor de sistem","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kees Cook, fost principal administrator de sistem la kernel.org \u0219i lider al echipei de securitate Ubuntu, acum angajat la Google pentru a asigura protec\u021bia Android \u0219i ChromeOS, a publicat un set de patch-uri care implementeaz\u0103 randomizarea ofseturilor \u00een stiva nucleului \u00een timpul proces\u0103rii apelurilor de sistem. Patch-urile cresc securitatea nucleului prin schimbarea amplas\u0103rii stivei, f\u0103c\u00e2nd atacurile asupra stivei mult mai complexe \u0219i mai pu\u021bin reu\u0219ite. Implementarea ini\u021bial\u0103 suport\u0103 procesoare ARM64 \u0219i x86\/x86_64. <\/p>\n

Ideea ini\u021bial\u0103 a patch-ului apar\u021bine proiectului PaX RANDKSTACK. \u00cen 2019, Elena Re\u0219etova, inginer de la Intel, a \u00eencercat s\u0103 creeze o implementare a acestei idei, potrivit\u0103 pentru integrarea \u00een kernel-ul Linux. Ulterior, ini\u021biativa a fost preluat\u0103 de Kis Cook, care a prezentat o implementare adecvat\u0103 pentru versiunea standard a kernel-ului. Patch-urile sunt prev\u0103zute pentru a fi incluse \u00een lansarea 5.13. Modul va fi dezactivat \u00een mod implicit. Pentru activare, sunt propuse parametrul din linia de comand\u0103 a kernel-ului \u00abrandomize_kstack_offset=on\/off\u00bb \u0219i configura\u021bia CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT. Costurile suplimentare pentru activarea modulului sunt estimate la aproximativ 1% pierdere de performan\u021b\u0103. <\/p>\n

Esenta protec\u021biei propuse const\u0103 \u00een alegerea unui ofset aleator al stivei la fiecare apel de sistem, ceea ce complic\u0103 determinarea aranjamentului stivei \u00een memorie, chiar \u0219i dup\u0103 ob\u021binerea datelor despre adrese, deoarece la urm\u0103torul apel de sistem, adresa de baz\u0103 a stivei se va schimba. Spre deosebire de implementarea PaX RANDKSTACK, \u00een patch-urile propuse pentru incluziune \u00een nucleu, randomizarea se efectueaz\u0103 nu \u00een etapa ini\u021bial\u0103 (cpu_current_top_of_stack), ci dup\u0103 setarea structurii pt_regs, ceea ce face imposibil\u0103 utilizarea metodelor bazate pe ptrace pentru a determina ofsetul randomizat \u00een timpul unui apel de sistem lung.
\n
Sursa: opennet.ro<\/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\udd47Patch-uri pentru randomizarea adreselor stivei nucleului Linux \u00een timpul apelurilor de sistem | ProHoster","description":"Kees Cook, fost principal administrator de sistem la kernel.org \u0219i lider al echipei de securitate Ubuntu, acum angajat la Google pentru a asigura protec\u021bia Android \u0219i ChromeOS, a publicat un set de patch-uri care implementeaz\u0103 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