{"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 tuumas 5.19, mis on p\u00f5hjustatud Retbleed r\u00fcnnaku kaitse t\u00f5ttu.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

VMware'i insener p\u00f6\u00f6ras Linuxi tuumade arendajate t\u00e4helepanu sellele, et Linuxi tuuma 5.19 kasutamisel on j\u00f5udlus m\u00e4rkimisv\u00e4\u00e4rselt v\u00e4henenud. Testimisel virtuaalmasinas, kus t\u00f6\u00f6tati tuumaga 5.19 VMware ESXi h\u00fcperviisori keskkonnas, ilmnes, et arvutuste j\u00f5udlus v\u00e4henes 70%, v\u00f5rguoperatsioonide j\u00f5udlus 30% ja salvestusoperatsioonide j\u00f5udlus 13% v\u00f5rreldes sama konfiguratsiooniga, mis p\u00f5hines tuumal 5.18. <\/p>\n

J\u00f5udluse langemise p\u00f5hjuseks nimetatakse muutust Spectre v2 r\u00fcnnakute kaitse koodis (spectre_v2=ibrs), mis on rakendatud IBRS (Enhanced Indirect Branch Restricted Speculation) laiendatud k\u00e4skude p\u00f5hjal. See v\u00f5imaldab kohandada spekulatiivsete k\u00e4skude t\u00e4itmise lubamist ja keelamist katkestuste, s\u00fcsteemikutsungite ja konteksti vahetuste t\u00f6\u00f6tlemise ajal. Kaitse on sisse l\u00fclitatud, et blokeerida hiljuti tuvastatud Retbleed haavatavuse riski spekulatiivse t\u00e4itmise mehhanismis, mis v\u00f5imaldab teavet v\u00e4lja lugeda tuumam\u00e4lu v\u00f5i korraldada r\u00fcnnakut host-s\u00fcsteemi vastu. virtuaalmasinate<\/a>Kaitse v\u00e4ljal\u00fclitamisel (spectre_v2=off) j\u00f5udlus taastub algsetele tasemetele.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 VMware \u043e\u0431\u0440\u0430\u0442\u0438\u043b \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 Linux \u043d\u0430 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \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, \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.19. \u0422\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u044b \u0441 \u044f\u0434\u0440\u043e\u043c 5.19 \u0432 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