{"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\/hu\/blog\/news\/universitet-minnesoty-otstranyon-ot-razrabotki-yadra-linux-za-otpravku-somnitelnyh-patchej","title":{"rendered":"A Minnesotai Egyetem el lett tiltva a Linux kernel fejleszt\u00e9s\u00e9t\u0151l, mivel k\u00e9tes jav\u00edt\u00e1sokat k\u00fcldtek.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Greg Kroah-Hartman, aki a Linux kernel stabil \u00e1g\u00e1nak t\u00e1mogat\u00e1s\u00e1\u00e9rt felel, \u00fagy d\u00f6nt\u00f6tt, hogy megtiltja b\u00e1rmilyen m\u00f3dos\u00edt\u00e1s elfogad\u00e1s\u00e1t a Linux kernelbe a Minnesota Egyetemr\u0151l, valamint visszavonja az \u00f6sszes kor\u00e1bban elfogadott jav\u00edt\u00e1st \u00e9s \u00fajra\u00e9rt\u00e9keli azokat. A blokkol\u00e1s oka egy kutat\u00f3csoport tev\u00e9kenys\u00e9ge volt, amely rejtett sebezhet\u0151s\u00e9gek elhelyez\u00e9s\u00e9re t\u00f6rekedett ny\u00edlt forr\u00e1sk\u00f3d\u00fa projektek k\u00f3dj\u00e1ban. A csoport olyan jav\u00edt\u00e1sokat k\u00fcld\u00f6tt, amelyek k\u00fcl\u00f6nf\u00e9le hib\u00e1kat tartalmaztak, figyelt\u00e9k a k\u00f6z\u00f6ss\u00e9g reakci\u00f3j\u00e1t, \u00e9s tanulm\u00e1nyozt\u00e1k a m\u00f3dokat, hogyan lehetne kij\u00e1tszani a m\u00f3dos\u00edt\u00e1sok fel\u00fclvizsg\u00e1lati folyamat\u00e1t. Greg v\u00e9lem\u00e9nye szerint az ilyen k\u00eds\u00e9rletek v\u00e9grehajt\u00e1sa, amelyek rosszindulat\u00fa v\u00e1ltoztat\u00e1sok bevezet\u00e9s\u00e9re ir\u00e1nyulnak, elfogadhatatlan \u00e9s etik\u00e1tlan.      <\/p>\n<p>A blokkol\u00e1s oka az volt, hogy a csoport tagjai olyan jav\u00edt\u00e1st k\u00fcldtek, amely ellen\u0151rizte a mutat\u00f3kat a kett\u0151s h\u00edv\u00e1sok elker\u00fcl\u00e9se \u00e9rdek\u00e9ben a \u201efree\u201d funkci\u00f3hoz. A mutat\u00f3 haszn\u00e1lati kontextus\u00e1t figyelembe v\u00e9ve az ellen\u0151rz\u00e9s \u00e9rtelmetlen volt. A jav\u00edt\u00e1s k\u00fcld\u00e9s\u00e9nek c\u00e9lja az volt, hogy megfigyelj\u00e9k, \u00e1tmegy-e a hib\u00e1s m\u00f3dos\u00edt\u00e1s a kernelt fejleszt\u0151i vizsg\u00e1laton. Ezen k\u00edv\u00fcl a Minnesota Egyetem fejleszt\u0151i m\u00e1s k\u00e9tes v\u00e1ltoztat\u00e1sokat is tettek a kernelben, bele\u00e9rtve a rejtett sebezhet\u0151s\u00e9gek hozz\u00e1ad\u00e1s\u00e1t.     <\/p>\n<p>A jav\u00edt\u00e1sokat beny\u00fajt\u00f3 r\u00e9sztvev\u0151 pr\u00f3b\u00e1lta v\u00e9deni mag\u00e1t azzal, hogy egy \u00faj statikus elemz\u0151t tesztel, \u00e9s a v\u00e1ltoztat\u00e1s a benne v\u00e9gzett ellen\u0151rz\u00e9sek alapj\u00e1n k\u00e9sz\u00fclt. De Greg r\u00e1mutatott, hogy a javasolt jav\u00edt\u00e1sok nem jellemz\u0151ek a statikus elemz\u0151k \u00e1ltal \u00e9szlelt hib\u00e1kra, \u00e9s az \u00f6sszes beny\u00fajtott jav\u00edt\u00e1s val\u00f3j\u00e1ban nem jav\u00edt semmit. Figyelembe v\u00e9ve, hogy a vizsg\u00e1lt kutat\u00f3i csoport m\u00e1r kor\u00e1bban is pr\u00f3b\u00e1lkozott rejtett sebezhet\u0151s\u00e9gek javaslat\u00e1val, nyilv\u00e1nval\u00f3, hogy folytatt\u00e1k k\u00eds\u00e9rleteiket a kernel fejleszt\u0151i k\u00f6z\u00f6ss\u00e9gen.      <\/p>\n<p>\u00c9rdekes, hogy a k\u00eds\u00e9rletez\u0151 csoport vezet\u0151je a m\u00faltban r\u00e9szt vett val\u00f3di sebezhet\u0151s\u00e9gek kijav\u00edt\u00e1s\u00e1ban, p\u00e9ld\u00e1ul felfedezte az inform\u00e1ci\u00f3sziv\u00e1rg\u00e1st a USB stackben (CVE-2016-4482) \u00e9s a h\u00e1l\u00f3zati alrendszerben (CVE-2016-4485). A Minnesota Egyetem rejtett sebezhet\u0151s\u00e9gek el\u0151mozd\u00edt\u00e1s\u00e1val foglalkoz\u00f3 kutat\u00e1s\u00e1ban p\u00e9ldak\u00e9nt eml\u00edtik a CVE-2019-12819 sebezhet\u0151s\u00e9get, amelyet egy 2014-ben a kernelbe fogadott jav\u00edt\u00e1s okozott. A jav\u00edt\u00e1s a hiba kezel\u00e9s\u00e9re szolg\u00e1l\u00f3 blokkba mdio_bus h\u00edv\u00e1st adott hozz\u00e1 put_device-tel, de \u00f6t \u00e9vvel k\u00e9s\u0151bb kider\u00fclt, hogy ez a manipul\u00e1ci\u00f3 a mem\u00f3ria blokkra val\u00f3 hivatkoz\u00e1shoz vezetett azut\u00e1n, hogy azt felszabad\u00edtott\u00e1k ( \u201euse-after-free\u201d).     <\/p>\n<p>Ek\u00f6zben a kutat\u00e1s szerz\u0151i azt \u00e1ll\u00edtj\u00e1k, hogy munk\u00e1jukban \u00f6sszefoglalt\u00e1k 138 hib\u00e1s jav\u00edt\u00e1st, amelyek nem kapcsol\u00f3dtak a kutat\u00e1s r\u00e9sztvev\u0151ihez. A saj\u00e1t hib\u00e1s jav\u00edt\u00e1sok k\u00fcld\u00e9si pr\u00f3b\u00e1lkoz\u00e1sai e-mail v\u00e1lt\u00e1sra korl\u00e1toz\u00f3dtak, \u00e9s az ilyen v\u00e1ltoztat\u00e1sok nem ker\u00fcltek be a Git-be (ha a patch e-mailben t\u00f6rt\u00e9n\u0151 elk\u00fcld\u00e9se ut\u00e1n a karbantart\u00f3 norm\u00e1lisnak tal\u00e1lta a patch-et, akkor k\u00e9rte, hogy ne legyen a v\u00e1ltoztat\u00e1s bekapcsolva, mivel hib\u00e1t tartalmazott, majd elk\u00fcldt\u00e9k a helyes jav\u00edt\u00e1st).            <\/p>\n<p>Kieg\u00e9sz\u00edt\u00e9s 1: A kritiz\u00e1lt jav\u00edt\u00e1s szerz\u0151j\u00e9nek aktivit\u00e1sa alapj\u00e1n r\u00e9g\u00f3ta k\u00fcld hib\u00e1s jav\u00edt\u00e1sokat a kernel k\u00fcl\u00f6nb\u00f6z\u0151 alrendszereibe. P\u00e9ld\u00e1ul a radeon \u00e9s nouveau driverekbe nemr\u00e9giben ker\u00fcltek be v\u00e1ltoztat\u00e1sok a pm_runtime_put_autosuspend(dev-&gt;dev) hibakezel\u00e9si blokkj\u00e1ban, ami feltehet\u0151leg a mell\u00e9klettel egy\u00fctt a kapcsol\u00f3d\u00f3 mem\u00f3ria felszabad\u00edt\u00e1sa ut\u00e1n a pufferek haszn\u00e1lat\u00e1hoz vezetett.    <\/p>\n<p>Kieg\u00e9sz\u00edt\u00e9s 2: Greg 190 olyan m\u00f3dos\u00edt\u00e1st h\u00fazott vissza, amelyek @umn.edu c\u00edmekkel voltak kapcsolatosak, \u00e9s kezdem\u00e9nyezte azok \u00fajra\u00e9rt\u00e9kel\u00e9s\u00e9t. A probl\u00e9ma az, hogy az @umn.edu c\u00edmekkel rendelkez\u0151 r\u00e9sztvev\u0151k nemcsak k\u00e9tes jav\u00edt\u00e1sok el\u0151mozd\u00edt\u00e1s\u00e1val k\u00eds\u00e9rleteztek, hanem val\u00f3s sebezhet\u0151s\u00e9geket is orvosoltak, \u00e9s a m\u00f3dos\u00edt\u00e1sok visszavon\u00e1sa a kor\u00e1bban jav\u00edtott biztons\u00e1gi probl\u00e9m\u00e1k \u00fajb\u00f3li megjelen\u00e9s\u00e9hez vezethet. N\u00e9h\u00e1ny fenntart\u00f3 m\u00e1r \u00e1tn\u00e9zte a visszavont v\u00e1ltoztat\u00e1sokat, \u00e9s nem tal\u00e1lt probl\u00e9m\u00e1kat, de az egyik fenntart\u00f3 megjegyezte, hogy az \u00e1ltala kapott egyik jav\u00edt\u00e1sban hib\u00e1k voltak.<br \/>\n<br \/>Forr\u00e1s: <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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