{"id":105072,"date":"2022-09-12T15:37:54","date_gmt":"2022-09-12T13:37:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed"},"modified":"2022-09-12T15:37:54","modified_gmt":"2022-09-12T13:37:54","slug":"seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","title":{"rendered":"T\u00f5sine j\u00f5udluse langus 5.19 kernelis, mis on p\u00f5hjustatud Retbleedi r\u00fcnnaku kaitse t\u00f5ttu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

VMware insener juhtis Linuxi tuuma arendajate t\u00e4helepanu m\u00e4rkimisv\u00e4\u00e4rsele j\u00f5udluse langusele, kasutades Linuxi tuuma 5.19. Tuuma 5.19 p\u00f5hjal testitud virtuaalmasina j\u00f5udlus VMware ESXi h\u00fcpervisiorkeskkonnas langes 70% v\u00f5rra arvutuste, 30% v\u00f5rra v\u00f5rguoperatsioonide ja 13% v\u00f5rra salvestusoperatsioonide osas, v\u00f5rreldes sama konfiguratsiooniga tuumal 5.18. <\/p>\n

J\u00f5udluse languse p\u00f5hjuseks on nimetatud muudatused turvamehhanismis, mis kaitseb Spectre v2 r\u00fcnnakute eest (spectre_v2=ibrs), mis on rakendatud laiendatud IBRS (Enhanced Indirect Branch Restricted Speculation) k\u00e4skude p\u00f5hjal, mis v\u00f5imaldavad kohandatavalt lubada ja keelata spetsiifiliste k\u00e4skude spekulatiivse t\u00e4itmise sisse- ja v\u00e4ljal\u00fclitamist katkestuste, s\u00fcstemaatiliste v\u00e4ljakutsete ja konteksti vahetamise ajal. See kaitse on sisse l\u00fclitatud hiljuti avastatud Retbleed haavatavuse blokeerimiseks, mis on seotud CPU spekulatiivse k\u00e4skude t\u00e4itmise mehhanismiga, v\u00f5imaldades v\u00e4lja t\u00f5mmata teavet tuuma m\u00e4lust v\u00f5i korraldada r\u00fcnnak host-s\u00fcsteemi vastu. virtuaalmasinad<\/a>. P\u00e4rast kaitse v\u00e4ljal\u00fclitamist (spectre_v2=off) naaseb j\u00f5udlus endisele tasemele.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 VMware ESXi \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u043e \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439 \u043d\u0430 70%, \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u043d\u0430 30% \u0438 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0439 \u0441 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435\u043c \u043d\u0430 13%, \u043f\u043e \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044e \u0441 \u0442\u043e\u0439 \u0436\u0435 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 \u044f\u0434\u0440\u0430 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