{"id":99982,"date":"2021-04-21T22:23:44","date_gmt":"2021-04-21T20:23:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/universitet-minnesoty-otstranyon-ot-razrabotki-yadra-linux-za-otpravku-somnitelnyh-patchej"},"modified":"2021-04-21T22:23:44","modified_gmt":"2021-04-21T20:23:44","slug":"universitet-minnesoty-otstranyon-ot-razrabotki-yadra-linux-za-otpravku-somnitelnyh-patchej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/universitet-minnesoty-otstranyon-ot-razrabotki-yadra-linux-za-otpravku-somnitelnyh-patchej","title":{"rendered":"Univerzita v Minnesot\u011b byla odstavena od v\u00fdvoje j\u00e1dra Linux za odes\u00edl\u00e1n\u00ed pochybn\u00fdch patch\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Greg Kroah-Hartman, zodpov\u011bdn\u00fd za \u00fadr\u017ebu stabiln\u00ed verze j\u00e1dra Linux, se rozhodl zak\u00e1zat jak\u00e9koli zm\u011bny p\u0159ich\u00e1zej\u00edc\u00ed z Minnesotsk\u00e9 univerzity a tak\u00e9 zp\u011btn\u011b zru\u0161it v\u0161echny d\u0159\u00edve p\u0159ijat\u00e9 patche a prov\u00e9st jejich nov\u00e9 posouzen\u00ed. D\u016fvodem blokace byla \u010dinnost v\u00fdzkumn\u00e9 skupiny, kter\u00e1 zkoum\u00e1 mo\u017enost propagace skryt\u00fdch zranitelnost\u00ed v k\u00f3du otev\u0159en\u00fdch projekt\u016f. Tato skupina pos\u00edlala patche obsahuj\u00edc\u00ed r\u016fzn\u00e9 chyby, sledovala reakci komunity a zkoumala zp\u016fsoby obch\u00e1zen\u00ed procesu hodnocen\u00ed zm\u011bn. Podle Grega je prov\u00e1d\u011bn\u00ed takov\u00fdch experiment\u016f na zav\u00e1d\u011bn\u00ed \u0161kodliv\u00fdch zm\u011bn nep\u0159ijateln\u00e9 a neetick\u00e9.      <\/p>\n<p>D\u016fvodem blokace bylo zasl\u00e1n\u00ed patche \u010dleny t\u00e9to skupiny, kter\u00fd p\u0159idal kontrolu ukazatele, aby se vylou\u010dilo mo\u017en\u00e9 dvojit\u00e9 vol\u00e1n\u00ed funkce \u201efree\u201c. S ohledem na kontext pou\u017eit\u00ed ukazatele byla kontrola bezv\u00fdznamn\u00e1. C\u00edlem zasl\u00e1n\u00ed patche bylo zjistit, zda chybn\u00e9 zm\u011bny projdou reviz\u00ed v\u00fdvoj\u00e1\u0159i j\u00e1dra. Krom\u011b uveden\u00e9ho patche se objevily i dal\u0161\u00ed pokusy v\u00fdvoj\u00e1\u0159\u016f z Minnesotsk\u00e9 univerzity vn\u00e9st pochybn\u00e9 zm\u011bny do j\u00e1dra, v\u010detn\u011b t\u011bch, kter\u00e9 souvisej\u00ed s p\u0159id\u00e1n\u00edm skryt\u00fdch zranitelnost\u00ed.     <\/p>\n<p>Odes\u00edlatel patch\u016f se pokusil obh\u00e1jit tvrzen\u00edm, \u017ee testuje nov\u00fd statick\u00fd analyz\u00e1tor a zm\u011bna byla p\u0159ipravena na z\u00e1klad\u011b v\u00fdsledk\u016f jeho kontroly. Greg v\u0161ak pouk\u00e1zal na to, \u017ee navrhovan\u00e9 opravy nejsou typick\u00e9 pro chyby odhalen\u00e9 statick\u00fdmi analyz\u00e1tory, a v\u0161echny zaslan\u00e9 patche vlastn\u011b nic neopravuj\u00ed. S ohledem na to, \u017ee zmi\u0148ovan\u00e1 skupina v\u00fdzkumn\u00edk\u016f se ji\u017e v minulosti sna\u017eila prosazovat opravy se skryt\u00fdmi zranitelnostmi, je z\u0159ejm\u00e9, \u017ee ve sv\u00fdch experimentech na komunit\u011b v\u00fdvoj\u00e1\u0159\u016f j\u00e1dra pokra\u010dovali.      <\/p>\n<p>Zaj\u00edmav\u00e9 je, \u017ee v minulosti vedouc\u00ed experiment\u00e1ln\u00ed skupiny se pod\u00edlel na legitimn\u00edm oprav\u011b zranitelnost\u00ed; nap\u0159\u00edklad odhalil \u00faniky informac\u00ed v USB stacku (CVE-2016-4482) a v s\u00ed\u0165ov\u00e9 subsyst\u00e9mu (CVE-2016-4485). Ve studii skryt\u00e9ho prosazov\u00e1n\u00ed zranitelnost\u00ed skupina z Minnesotsk\u00e9 univerzity uv\u00e1d\u00ed p\u0159\u00edklad zranitelnosti CVE-2019-12819, kter\u00e1 vznikla opravou p\u0159ijatou do j\u00e1dra v roce 2014. Oprava p\u0159idala do bloku zpracov\u00e1n\u00ed chyb v mdio_bus vol\u00e1n\u00ed put_device, ale po p\u011bti letech se uk\u00e1zalo, \u017ee takov\u00e1 manipulace vede k p\u0159\u00edstupu k bloku pam\u011bti po jeho uvoln\u011bn\u00ed (\u201euse-after-free\u201c).     <\/p>\n<p>Auto\u0159i v\u00fdzkumu p\u0159itom tvrd\u00ed, \u017ee ve sv\u00e9 pr\u00e1ci shrnuli \u00fadaje o 138 oprav\u00e1ch, kter\u00e9 obsahovaly chyby a nebyly spojeny s \u00fa\u010dastn\u00edky v\u00fdzkumu. Pokusy o zasl\u00e1n\u00ed vlastn\u00edch chybov\u00fdch oprav byly omezeny na e-mailovou korespondenci, a takov\u00e9 zm\u011bny se nedostaly do Gitu (pokud po zasl\u00e1n\u00ed opravy e-mailem udr\u017eovatel pova\u017eoval opravu za norm\u00e1ln\u00ed, byl po\u017e\u00e1d\u00e1n, aby nezahrnoval zm\u011bnu, proto\u017ee tam byla chyba, po \u010dem\u017e byla zasl\u00e1na spr\u00e1vn\u00e1 oprava).            <\/p>\n<p>Dopln\u011bk 1: Soud\u011b podle aktivity autora kritizovan\u00e9 opravy ji\u017e dlouho zas\u00edl\u00e1 opravy do r\u016fzn\u00fdch subsyst\u00e9m\u016f j\u00e1dra. Nap\u0159\u00edklad v driverech radeon a nouveau byly ned\u00e1vno p\u0159ijaty zm\u011bny s vol\u00e1n\u00edm pm_runtime_put_autosuspend(dev-&gt;dev) v bloku chyb, co\u017e m\u016f\u017ee v\u00e9st k pou\u017eit\u00ed bufferu po uvoln\u011bn\u00ed p\u0159idru\u017een\u00e9 pam\u011bti.    <\/p>\n<p>Dopln\u011bn\u00ed 2: Greg zru\u0161il 190 commit\u016f souvisej\u00edc\u00edch s adresami \u201e@umn.edu\u201c a inicioval jejich op\u011btovn\u00e9 p\u0159ezkoum\u00e1n\u00ed. Probl\u00e9m je v tom, \u017ee \u00fa\u010dastn\u00edci s adresami \u201e@umn.edu\u201c nejen experimentovali s propagac\u00ed pochybn\u00fdch patch\u016f, ale tak\u00e9 odstranili skute\u010dn\u00e9 zranitelnosti, a zru\u0161en\u00ed zm\u011bn m\u016f\u017ee v\u00e9st k n\u00e1vratu d\u0159\u00edve opraven\u00fdch bezpe\u010dnostn\u00edch probl\u00e9m\u016f. N\u011bkte\u0159\u00ed udr\u017eovatel\u00e9 ji\u017e znovu zkontrolovali zru\u0161en\u00e9 zm\u011bny a nena\u0161li \u017e\u00e1dn\u00e9 probl\u00e9my, ale jeden z udr\u017eovatel\u016f uvedl, \u017ee v jednom z jemu zaslan\u00fdch patch\u016f byly chyby.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55000\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0435\u0433 \u041a\u0440\u043e\u0430-\u0425\u0430\u0440\u0442\u043c\u0430\u043d (Greg Kroah-Hartman), \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0438\u0439 \u0437\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u044f\u0434\u0440\u0430 Linux, \u043f\u0440\u0438\u043d\u044f\u043b \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0437\u0430\u043f\u0440\u0435\u0442\u0438\u0442\u044c \u043f\u0440\u0438\u0451\u043c \u0432 \u044f\u0434\u0440\u043e Linux \u043b\u044e\u0431\u044b\u0445 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439, \u043f\u043e\u0441\u0442\u0443\u043f\u0430\u044e\u0449\u0438\u0445 \u0438\u0437 \u0423\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u041c\u0438\u043d\u043d\u0435\u0441\u043e\u0442\u044b, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043e\u0442\u043a\u0430\u0442\u0438\u0442\u044c \u0432\u0441\u0435 \u0440\u0430\u043d\u0435\u0435 \u043f\u0440\u0438\u043d\u044f\u0442\u044b\u0435 \u043f\u0430\u0442\u0447\u0438 \u0438 \u043f\u0440\u043e\u0432\u0435\u0441\u0442\u0438 \u0438\u0445 \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u043e\u0435 \u0440\u0435\u0446\u0435\u043d\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435. \u041f\u0440\u0438\u0447\u0438\u043d\u043e\u0439 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0438 \u0441\u0442\u0430\u043b\u0430 \u0434\u0435\u044f\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0439 \u0433\u0440\u0443\u043f\u043f\u044b, \u0438\u0437\u0443\u0447\u0430\u044e\u0449\u0435\u0439 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0434\u0432\u0438\u0436\u0435\u043d\u0438\u044f \u0441\u043a\u0440\u044b\u0442\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u043a\u043e\u0434 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432. \u0423\u043a\u0430\u0437\u0430\u043d\u043d\u0430\u044f \u0433\u0440\u0443\u043f\u043f\u0430 \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u043b\u0430 \u043f\u0430\u0442\u0447\u0438, [&hellip;]<\/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-99982","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0435\u0433 \u041a\u0440\u043e\u0430-\u0425\u0430\u0440\u0442\u043c\u0430\u043d (Greg Kroah-Hartman), \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0438\u0439 \u0437\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u044f\u0434\u0440\u0430 Linux, \u043f\u0440\u0438\u043d\u044f\u043b \u0440\u0435\u0448\u0435\u043d\u0438\u0435 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vylou\u010dena z v\u00fdvoje j\u00e1dra Linux za zas\u00edl\u00e1n\u00ed pochybn\u00edch oprav | ProHoster","description":"Greg Kroah-Hartman, odpov\u011bdn\u00fd za podporu stabiln\u00ed v\u011btve j\u00e1dra Linux, se rozhodl zak\u00e1zat p\u0159ij\u00edm\u00e1n\u00ed jak\u00fdchkoli zm\u011bn do j\u00e1dra Linux pochoduj\u00edc\u00edch z Minnesotsk\u00e9 univerzity, a tak\u00e9 vr\u00e1tit v\u0161echny.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/universitet-minnesoty-otstranyon-ot-razrabotki-yadra-linux-za-otpravku-somnitelnyh-patchej","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS 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