Linus Torvalds pl\u00e1noval zve\u0159ejnit vyd\u00e1n\u00ed j\u00e1dra Linux 6.13 tuto ned\u011bli, ale testov\u00e1n\u00ed v\u011btve 6.13 pravd\u011bpodobn\u011b potrv\u00e1 o t\u00fdden d\u00e9le kv\u016fli probl\u00e9m\u016fm se stabilitou v \u00faprav\u00e1ch p\u0159ipraven\u00fdch zam\u011bstnancem Microsoftu a p\u0159ijat\u00fdch ve v\u011btvi 6.13 v listopadu. D\u00e1le bylo poznamen\u00e1no, \u017ee oprava, kter\u00e1 zp\u016fsobila selh\u00e1n\u00ed, byla pod\u00e1na nezvykle \u2014 ale byla p\u0159ijata, p\u0159esto\u017ee nedostala \u017e\u00e1dn\u00e9 potvrzen\u00ed (ACK) od spr\u00e1vc\u016f architektury x86, co\u017e je poru\u0161en\u00edm obecn\u011b uzn\u00e1van\u00fdch praktik. <\/p>\n
Z\u00e1plata p\u0159id\u00e1vala mo\u017enost pou\u017e\u00edvat velk\u00e9 str\u00e1nky pam\u011bti v re\u017eimu ROX (Read Only Execute) p\u0159i alokaci pam\u011bti ur\u010den\u00e9 pro um\u00edst\u011bn\u00ed spustiteln\u00fdch k\u00f3d\u016f. ROX umo\u017e\u0148uje pou\u017e\u00edvat pam\u011b\u0165 se spustiteln\u00fdm k\u00f3dem v re\u017eimu pouze pro \u010dten\u00ed, co\u017e zt\u011b\u017euje vyu\u017e\u00edv\u00e1n\u00ed n\u011bkter\u00fdch zranitelnost\u00ed. V j\u00e1d\u0159e 6.13 bylo pro spustiteln\u00fd k\u00f3d modul\u016f na syst\u00e9mech x86_64 ve v\u00fdchoz\u00edm nastaven\u00ed povoleno pou\u017e\u00edv\u00e1n\u00ed cache velk\u00fdch spustiteln\u00fdch str\u00e1nek pam\u011bti, reflektovan\u00fdch jako ROX. Zm\u011bna \u0159e\u0161ila probl\u00e9m s mapov\u00e1n\u00edm v re\u017eimu ROX str\u00e1nek pro je\u0161t\u011b pln\u011b nevytvo\u0159en\u00fd spustiteln\u00fd k\u00f3d a umo\u017enila se obej\u00edt bez do\u010dasn\u00e9ho repagingu ROX-str\u00e1nek do re\u017eimu z\u00e1pisu do doby, ne\u017e byly moduly j\u00e1dra p\u0159ipraveny k provozu. <\/p>\n
V kone\u010dn\u00e9 f\u00e1zi testov\u00e1n\u00ed j\u00e1dra 6.13 odhalil in\u017een\u00fdr ze spole\u010dnosti Intel probl\u00e9m, kter\u00fd br\u00e1nil j\u00e1dru spr\u00e1vn\u011b se probudit ze sp\u00e1nkov\u00e9ho re\u017eimu na n\u011bkter\u00fdch notebooc\u00edch s procesory Intel (nap\u0159\u00edklad s CPU zalo\u017een\u00fdmi na mikroarchitektu\u0159e Alder Lake). Probl\u00e9m se projevoval p\u0159i sestaven\u00ed j\u00e1dra kompil\u00e1torem Clang se zapnut\u00fdm re\u017eimem ochrany CFI (Control Flow Integrity), kter\u00fd blokoval poru\u0161en\u00ed norm\u00e1ln\u00edho po\u0159ad\u00ed prov\u00e1d\u011bn\u00ed (control flow) v d\u016fsledku pou\u017eit\u00ed exploit\u016f, kter\u00e9 m\u011bn\u00ed ulo\u017een\u00e9 v pam\u011bti ukazatele na funkce. Jako do\u010dasn\u00e9 \u0159e\u0161en\u00ed maintaine\u0159i ze spole\u010dnost\u00ed Intel a AMD, odpov\u011bdn\u00ed za architekturu x86, navrhli vypnout pou\u017e\u00edv\u00e1n\u00ed EXECMEM_ROX v j\u00e1d\u0159e 6.13, dokud nebude p\u0159ipravena a otestov\u00e1na plnohodnotn\u00e1 z\u00e1plata, kter\u00e1 probl\u00e9m vy\u0159e\u0161\u00ed (prvn\u00ed varianta opravy probl\u00e9m nevy\u0159e\u0161ila). \u041b\u0438\u043d\u0443\u0441 \u0422\u043e\u0440\u0432\u0430\u043b\u044c\u0434\u0441 \u043d\u0430\u043c\u0435\u0440\u0435\u0432\u0430\u043b\u0441\u044f \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u0442\u044c \u0440\u0435\u043b\u0438\u0437 \u044f\u0434\u0440\u0430 Linux 6.13 \u0432 \u044d\u0442\u043e \u0432\u043e\u0441\u043a\u0440\u0435\u0441\u0435\u043d\u044c\u0435, \u043d\u043e \u0441\u043a\u043e\u0440\u0435\u0435 \u0432\u0441\u0435\u0433\u043e \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0435\u0442\u043a\u0438 6.13 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u0434\u043b\u0435\u043d\u043e \u043d\u0430 \u043d\u0435\u0434\u0435\u043b\u044e \u0438\u0437-\u0437\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441\u043e \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e \u0432 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f\u0445, \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u043e\u0442\u0440\u0443\u0434\u043d\u0438\u043a\u043e\u043c Microsoft \u0438 \u043f\u0440\u0438\u043d\u044f\u0442\u044b\u0445 \u0432 \u0432\u0435\u0442\u043a\u0443 6.13 \u0432 \u043d\u043e\u044f\u0431\u0440\u0435. \u0414\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u0430\u0442\u0447, \u0441\u0442\u0430\u0432\u0448\u0438\u0439 \u043f\u0440\u0438\u0447\u0438\u043d\u043e\u0439 \u0441\u0431\u043e\u044f, \u0431\u044b\u043b \u043f\u043e\u0434\u0430\u043d \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e — \u043d\u043e \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442, \u0445\u043e\u0442\u044f \u043d\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043b \u043d\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-121343","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\udd47 V chystan\u00e9m vyd\u00e1n\u00ed j\u00e1dra Linux 6.13 byl nalezen p\u00e1d zp\u016fsoben\u00fd k\u00f3dem zam\u011bstnance Microsoftu | 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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"