{"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\/hu\/blog\/news\/v-yadro-linux-5-4-prinyaty-patchi-dlya-ogranicheniya-dostupa-root-k-vnutrennostyam-yadra","title":{"rendered":"A Linux 5.4 kernel patches have been accepted to limit root access to the core.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linus Torvalds accepted<\/a><\/noindex> A Linux 5.4 kernel release will include a set of patcheslockdown<\/a><\/noindex>« proposed<\/a><\/noindex>\tDavid Howell (works at Red Hat) and Matthew Garrett (Matthew Garrett<\/a><\/noindex>, developed at Google, to restrict root user access to the kernel. The functionality related to 'lockdown' has been moved to an optional loadable LSM module (Linux Security Module<\/a><\/noindex>), which establishes a barrier between UID 0 and the kernel, restricting certain low-level functionality.<\/p>\n

If an attacker manages to execute code with root privileges, they can run their code at the kernel level, for example, by replacing the kernel using kexec or reading\/writing memory via \/dev\/kmem. The most apparent consequence of such activity could be bypassing<\/a><\/noindex> UEFI Secure Boot or extracting confidential data stored at the kernel level.<\/p>\n

Initially, the root restriction functions were developed in the context of enhancing secure boot protection, and distributions have been using third-party patches for quite some time to block the bypass of UEFI Secure Boot. However, these restrictions were not included in the main kernel due to disagreements<\/a><\/noindex> ) in its implementation, addressing concerns about the disruption of existing systems. The 'lockdown' module includes patches already used in distributions, which have been reworked into a separate subsystem not tied to UEFI Secure Boot. <\/p>\n

In lockdown mode, access to \/dev\/mem, \/dev\/kmem, \/dev\/port, \/proc\/kcore, debugfs, kprobes debug mode, mmiotrace, tracefs, BPF, PCMCIA CIS (Card Information Structure), some ACPI interfaces, and CPU MSR registers is restricted, kexec_file and kexec_load calls are blocked, transitioning to sleep mode is prohibited, DMA usage for PCI devices is limited, importing ACPI code from EFI variables is forbidden,
\ninput\/output port manipulation is not allowed, including changing the interrupt number and input\/output port for the serial port. <\/p>\n

By default, the lockdown module is not active, it is built when specifying the kconfig option SECURITY_LOCKDOWN_LSM and activated through the kernel parameter 'lockdown=', the control file '\/sys\/kernel\/security\/lockdown' or build options LOCK_DOWN_KERNEL_FORCE_*<\/a><\/noindex>, which can take the values 'integrity' and 'confidentiality'. In the first case, it blocks the ability to make changes to the running kernel from user space, and in the second case, it additionally disables functionality that can be used to extract confidential information from the kernel.<\/p>\n

Fontos megjegyezni, hogy a lockdown csup\u00e1n korl\u00e1tozza a maghoz val\u00f3 hozz\u00e1f\u00e9r\u00e9s be\u00e9p\u00edtett k\u00e9pess\u00e9geit, de nem v\u00e9d a sebezhet\u0151s\u00e9gek kihaszn\u00e1l\u00e1s\u00e1val v\u00e9grehajtott m\u00f3dos\u00edt\u00e1sokt\u00f3l. A m\u0171k\u00f6d\u0151 magba t\u00f6rt\u00e9n\u0151 m\u00f3dos\u00edt\u00e1sok blokkol\u00e1s\u00e1hoz a kihaszn\u00e1l\u00e1sok alkalmaz\u00e1sakor az Openwall projekt... Go nyelven fejl\u0151dik.<\/a><\/noindex> k\u00fcl\u00f6n modul LKRG<\/a><\/noindex> (Linux Kernel Runtime Guard).<\/p>\n

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

Forr\u00e1s: 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\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\udd47A Linux 5.4 magba elfogadt\u00e1k a patcheket, amelyek korl\u00e1tozz\u00e1k a root hozz\u00e1f\u00e9r\u00e9st a mag bels\u0151s\u00e9geihez | ProHoster","description":"Linus Torvalds beleegyezett a j\u00f6v\u0151beli 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