{"id":38554,"date":"2019-10-31T22:24:30","date_gmt":"2019-10-31T19:24:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-yadro-linux-5-4-prinyaty-patchi-dlya-ogranicheniya-dostupa-root-k-vnutrennostyam-yadra\/"},"modified":"2019-10-31T22:24:30","modified_gmt":"2019-10-31T19:24:30","slug":"v-yadro-linux-5-4-prinyaty-patchi-dlya-ogranicheniya-dostupa-root-k-vnutrennostyam-yadra","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/v-yadro-linux-5-4-prinyaty-patchi-dlya-ogranicheniya-dostupa-root-k-vnutrennostyam-yadra","title":{"rendered":"Linux'i kerneli 5.4 sisaldab pat\u0161e, mis piiravad root-juurdep\u00e4\u00e4su kernelis,","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linus Torvalds v<App ja<\/a><\/noindex> \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0431\u0443\u0434\u0443\u0449\u0435\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u044f\u0434\u0440\u0430 Linux 5.4 \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 «lockdown<\/a><\/noindex>« ettepanekud<\/a><\/noindex>\tDavid Howells (t\u00f6\u00f6tab Red Hats) ja Matthew Garrett (Matthew Garrett<\/a><\/noindex>, \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 Google) \u0434\u043b\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f root \u043a \u044f\u0434\u0440\u0443. \u0421\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 «lockdown» \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u043d\u0435\u0441\u0435\u043d\u0430 \u0432 \u043e\u043f\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u044b\u0439 LSM-\u043c\u043e\u0434\u0443\u043b\u044c (Linux Security Module<\/a><\/noindex>), mis loob barj\u00e4\u00e4ri UID 0 ja kernelis, piirates teatud madalamate tasemete funktsioone.<\/p>\n

Kui r\u00fcndaja on r\u00fcnnaku tulemusel saanud k\u00e4ivitada koodi root-privilegidega, siis saab ta oma koodi k\u00e4itada ka kernelitasemel, n\u00e4iteks tuuma asendamise kaudu kexec'i v\u00f5i m\u00e4lu lugemise\/kirjutamise kaudu \/dev\/kmem. Sellise tegevuse k\u00f5ige ilmsem tagaj\u00e4rg v\u00f5ib olla \u00fcmbersuunamine<\/a><\/noindex> UEFI Secure Booti v\u00f5i konfidentsiaalsete andmete hankimine, mis on salvestatud kernelitasemel.<\/p>\n

Alguses arendati root-juurdep\u00e4\u00e4su piiramise funktsioone konteksti raames, et tugevdada t\u00f5estatud k\u00e4ivitamise kaitset ning distributsioonid on juba m\u00f5nda aega kasutanud kolmandate osapoolte pat\u0161e UEFI Secure Boot'i \u00fcmbersuunamise blokeerimiseks. Samas ei ole sellised piirangud peamisse kernelisse kaasatud, kuna erimeelsused<\/a><\/noindex> \u0432 \u0438\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u043e\u043f\u0430\u0441\u0435\u043d\u0438\u0439 \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c. \u041c\u043e\u0434\u0443\u043b\u044c «lockdown» \u0432\u043e\u0431\u0440\u0430\u043b \u0432 \u0441\u0435\u0431\u044f \u0443\u0436\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0435 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043f\u0430\u0442\u0447\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0431\u044b\u043b\u0438 \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u044b \u0432 \u0444\u043e\u0440\u043c\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0439 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u043d\u0435 \u043f\u0440\u0438\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0439 \u043a UEFI Secure Boot. <\/p>\n

Lockdown-re\u017eiimis piiratakse juurdep\u00e4\u00e4su \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, kprobes'i silumisre\u017eiimi, mmiotrace, tracefs, BPF, PCMCIA CIS (Card Information Structure), m\u00f5nede ACPI liideste ja CPU MSR-registraatorite, blokeeritakse kexec_file'i ja kexec_load'i kutsed, keelatakse uinumisse minek, piiratakse DMA kasutamist PCI-seadmete jaoks, keelatakse ACPI koodi importimine EFI muutujatest,
\nkeeratakse sisse\/v\u00e4ljap\u00e4\u00e4su portide manipuleerimine, sealhulgas j\u00e4rje numbrite ja sisse\/v\u00e4ljap\u00e4\u00e4su portide muutmine j\u00e4rjestikuse porta jaoks. <\/p>\n

\u041f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043c\u043e\u0434\u0443\u043b\u044c lockdown \u043d\u0435 \u0430\u043a\u0442\u0438\u0432\u0435\u043d, \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u0438 \u0432 kconfig \u043e\u043f\u0446\u0438\u0438 SECURITY_LOCKDOWN_LSM \u0438 \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0447\u0435\u0440\u0435\u0437 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u044f\u0434\u0440\u0430 «lockdown=», \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u0444\u0430\u0439\u043b «\/sys\/kernel\/security\/lockdown» \u0438\u043b\u0438 \u0441\u0431\u043e\u0440\u043e\u0447\u043d\u044b\u0435 \u043e\u043f\u0446\u0438\u0438 LOCK_DOWN_KERNEL_FORCE_*<\/a><\/noindex>, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f «integrity» \u0438 «confidentiality». \u0412 \u043f\u0435\u0440\u0432\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0431\u043b\u043e\u043a\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0432\u043d\u043e\u0441\u0438\u0442\u044c \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0435 \u044f\u0434\u0440\u043e \u0438\u0437 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u0430 \u0432\u043e \u0432\u0442\u043e\u0440\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u043e\u043c\u0438\u043c\u043e \u044d\u0442\u043e\u0433\u043e \u043e\u0442\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u044f \u043a\u043e\u043d\u0444\u0438\u0434\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0438\u0437 \u044f\u0434\u0440\u0430.<\/p>\n

Oluline on m\u00e4rkida, et lockdown piirab ainult tuuma juurde p\u00e4\u00e4semise standardv\u00f5imalusi, kuid ei kaitse muudatuste eest, mis tekivad haavatavuste ekspluateerimise tulemusena. Muutuste blokeerimiseks t\u00f6\u00f6tavas tuumas ekspluateerimise rakendamisel on projekti Openwall. areneb<\/a><\/noindex> erinev moodul LKRG<\/a><\/noindex> (Linuxi tuuma t\u00f6\u00f6aegade kaitse).<\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041b\u0438\u043d\u0443\u0441 \u0422\u043e\u0440\u0432\u0430\u043b\u044c\u0434\u0441 \u043f\u0440\u0438\u043d\u044f\u043b \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u0431\u0443\u0434\u0443\u0449\u0435\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u044f\u0434\u0440\u0430 Linux 5.4 \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 «lockdown«, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u0414\u044d\u0432\u0438\u0434\u043e\u043c \u0425\u043e\u0443\u044d\u043b\u043b\u0441\u043e\u043c (David Howells, \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 Red Hat) \u0438 \u041c\u044d\u0442\u044c\u044e \u0413\u0430\u0440\u0440\u0435\u0442\u043e\u043c (Matthew Garrett, \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 Google) \u0434\u043b\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f root \u043a \u044f\u0434\u0440\u0443. \u0421\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 «lockdown» \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u043d\u0435\u0441\u0435\u043d\u0430 \u0432 \u043e\u043f\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u044b\u0439 LSM-\u043c\u043e\u0434\u0443\u043b\u044c (Linux Security Module), \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0449\u0438\u0439 \u0431\u0430\u0440\u044c\u0435\u0440 \u043c\u0435\u0436\u0434\u0443 UID 0 \u0438 […]<\/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-38554","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\udd47Linuxi tuuma 5.4 on vastu v\u00f5etud plaastrid, et piirata root-juurdep\u00e4\u00e4su tuuma sisemusele | ProHoster","description":"Linus Torvalds on andnud heakskiidu tulevase v\u00e4ljaande 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