{"id":107877,"date":"2023-04-16T12:48:13","date_gmt":"2023-04-16T10:48:13","guid":{"rendered":"https:\/\/prohoster.info\/?p=107877"},"modified":"2023-04-17T17:50:38","modified_gmt":"2023-04-17T15:50:38","slug":"uyazvimost-v-yadre-linux-6-2-pozvolyayushhaya-obojti-zashhitu-ot-atak-spectre-v2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-yadre-linux-6-2-pozvolyayushhaya-obojti-zashhitu-ot-atak-spectre-v2","title":{"rendered":"Linuxi tuumas 6.2 leitud haavatavus, mis v\u00f5imaldab Spectre v2 r\u00fcnnakute kaitset v\u00e4ltida.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linux 6.2 keers on leiti haavatavus (CVE-2023-1998), mis v\u00f5imaldab keelata Spectre v2 r\u00fcnnakute kaitse, mis v\u00f5imaldab p\u00e4\u00e4seda juurde teiste protsesside m\u00e4lule, mis t\u00f6\u00f6tavad erinevates SMT v\u00f5i Hyper-Threading voogudes, kuid \u00fches f\u00fc\u00fcsilises protsessori tuumas. See haavatavus v\u00f5ib muu hulgas v\u00f5imaldada andmelekke korraldamist virtuaalsete masinate vahel pilves\u00fcsteemides. Probleem puudutab ainult Linux 6.2 tuuma ja on tingitud vale optimeerimise rakendamisest, mis pidi v\u00e4hendama m\u00e4rkimisv\u00e4\u00e4rseid kulusid Spectre v2 kaitse rakendamisel. Haavatavus on k\u00f5rvaldatud eksperimentaalses Linux 6.3 tuuma harus. <\/p>\n

Kasutaja ruumis saavad protsessid Spectre r\u00fcnnakute vastu kaitsmiseks valikuliselt keelata spekulatiivsed k\u00e4skude t\u00e4itmised prctl PR_SET_SPECULATION_CTRL abil v\u00f5i kasutada s\u00fcsteemikutsungite filtreerimist seccompi mehhanismi p\u00f5hjal. Probleemi tuvastanud teadlaste s\u00f5nul j\u00e4id vale optimeerimise t\u00f5ttu 6.2 tuumas paljud kaitseta. virtuaalmasinaid<\/a> v\u00e4hemalt \u00fche suure pilveteenuse pakkuja, hoolimata spectre-BTI r\u00fcnnakute blokeerimise re\u017eiimi lubamisest prctl kaudu. Haavatavus ilmneb ka tavap\u00e4rastel serverites<\/a> kuue tuuma 6.2, mille laadimisel kasutatakse seadistust «spectre_v2=ibrs. <\/p>\n

Haavatavuse olemus seisneb selles, et IBRS v\u00f5i eIBRS kaitsere\u017eiimi valimisel keelavad sisseviidud optimeerimised STIBP (Single Thread Indirect Branch Predictors) mehhanismi rakendamise, mis on vajalik lekete blokeerimiseks SMT (samadeaegne mitme niidi) tehnoloogia kasutamisel. Samas tagab lekete kaitse voogude vahel vaid eIBRS re\u017eiim, mitte IBRS re\u017eiim, kuna sellel puhastatakse IBRS bit, mis tagab lekete kaitse loogiliste tuumade vahel, tulemuslikkuse kaalutlustel, kui juhtimisel taastatakse kasutajaruumi, muutes kasutajaruumi vood r\u00fcnnakute vastu Spectre v2 kaitsetuks.
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Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u0435 Linux 6.2 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-1998), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 Spectre v2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u043e\u0442\u043e\u043a\u0430\u0445 SMT \u0438\u043b\u0438 Hyper Threading, \u043d\u043e \u043d\u0430 \u043e\u0434\u043d\u043e\u043c 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[…]<\/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-107877","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\udd47Haavatavus Linux 6.2 keeres, mis v\u00f5imaldab v\u00e4ltida Spectre v2 r\u00fcnnakute kaitset | ProHoster","description":"Linux 6.2 keers on leiti haavatavus (CVE-2023-1998), mis v\u00f5imaldab keelata Spectre v2 r\u00fcnnakute kaitse, mis v\u00f5imaldab p\u00e4\u00e4seda juurde teiste protsesside m\u00e4lule, mis t\u00f6\u00f6tavad erinevates SMT v\u00f5i 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\u044f\u0434\u0440\u0435 Linux 6.2 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-1998), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 Spectre v2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u043e\u0442\u043e\u043a\u0430\u0445 SMT \u0438\u043b\u0438 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