{"id":99293,"date":"2021-02-28T10:22:45","date_gmt":"2021-02-28T08:22:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadro-linux-5-12-prinyata-podsistema-kfence-dlya-vyyavleniya-oshibok-pri-rabote-s-pamyatyu"},"modified":"2021-02-28T10:22:45","modified_gmt":"2021-02-28T08:22:45","slug":"v-yadro-linux-5-12-prinyata-podsistema-kfence-dlya-vyyavleniya-oshibok-pri-rabote-s-pamyatyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/news\/v-yadro-linux-5-12-prinyata-podsistema-kfence-dlya-vyyavleniya-oshibok-pri-rabote-s-pamyatyu","title":{"rendered":"N\u00ebnversioni i Linux 5.12 miratoi n\u00ebn-sistemin KFence p\u00ebr identifikimin e gabimeve gjat\u00eb pun\u00ebs me memorie.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

N\u00eb kernelin Linux 5.12, i cili \u00ebsht\u00eb n\u00ebn zhvillim, \u00ebsht\u00eb p\u00ebrfshir\u00eb nj\u00eb realizim i mekanizmit KFence (Kernel Electric Fence), i cili kontrollon p\u00ebrdorimin e memories, duke kapur daljet p\u00ebrtej kufijve t\u00eb tampon\u00ebve, qasjet n\u00eb memorien pas \u00e7lirimit dhe gabime t\u00eb tjera t\u00eb ngjashme. <\/p>\n

Kjo funksionalitet tashm\u00eb ishte prezente n\u00eb b\u00ebrtham\u00eb si nj\u00eb opsion nd\u00ebrtimi KASAN (sanitizues i adres\u00ebs s\u00eb b\u00ebrtham\u00ebs, p\u00ebrdor Address Sanitizer n\u00eb gcc dhe clang moderne) \u2014 megjithat\u00eb, ajo u pozicionua kryesisht p\u00ebr aplikime debugging. Nsubsistemi KFence dallon nga KASAN p\u00ebr shpejt\u00ebsin\u00eb e tij t\u00eb lart\u00eb t\u00eb pun\u00ebs, e cila lejon p\u00ebrdorimin e k\u00ebtij mund\u00ebsie edhe n\u00eb b\u00ebrthama n\u00eb sisteme operative. <\/p>\n

P\u00ebrdorimi n\u00eb sisteme operative do t\u00eb mund\u00ebsoj\u00eb zbulimin e gabimeve n\u00eb p\u00ebrdorimin e memories, t\u00eb cilat nuk shfaqen n\u00eb testimet e para dhe dalin vet\u00ebm n\u00eb ngarkesa operative ose gjat\u00eb pun\u00ebs s\u00eb gjat\u00eb (n\u00eb uptime t\u00eb lart\u00eb). P\u00ebr m\u00eb tep\u00ebr, p\u00ebrdorimi i KFence n\u00eb sisteme operative do t\u00eb mund\u00ebsoj\u00eb nj\u00eb rritje t\u00eb konsiderueshme t\u00eb numrit t\u00eb makinave t\u00eb p\u00ebrfshira n\u00eb verifikimin e pun\u00ebs s\u00eb kernelit me memorien. <\/p>\n

Shpenzimet minimale, t\u00eb pavarura nga ngarkesa, arrihen n\u00eb KFence p\u00ebrmes z\u00ebvend\u00ebsimit t\u00eb faqeve mbrojt\u00ebse (guard pages) n\u00eb heap p\u00ebrmes intervaleve fikse. Pas p\u00ebrfundimit t\u00eb intervalit t\u00eb mbrojtjes, KFence, p\u00ebrmes sistemit t\u00eb zakonsh\u00ebm t\u00eb ndarjes s\u00eb memories (SLAB ose SLUB allocator), shton nj\u00eb faqe mbrojt\u00ebse nga pool-i i objekteve KFence dhe niset nj\u00eb num\u00ebrim t\u00eb ri t\u00eb koh\u00ebs. \u00c7do objekt KFence vendoset n\u00eb nj\u00eb faqe t\u00eb ve\u00e7ant\u00eb memories, nd\u00ebrsa faqet e memories n\u00eb kufijt\u00eb e majt\u00eb dhe t\u00eb djatht\u00eb formojn\u00eb faqet mbrojt\u00ebse, t\u00eb cilat kan\u00eb nj\u00eb madh\u00ebsi q\u00eb zgjidhet n\u00eb m\u00ebnyr\u00eb t\u00eb rast\u00ebsishme. <\/p>\n

K\u00ebshtu, faqet me objekte ndahen nga nj\u00ebra-tjetra me faqe mbrojt\u00ebse, t\u00eb cilat konfigurohen p\u00ebr t\u00eb gjeneruar \"page fault\" p\u00ebr \u00e7do qasje. P\u00ebr t\u00eb identifikuar operacionet e shkruarjes jasht\u00eb kufijve t\u00eb buffers brenda faqeve me objekte, p\u00ebrdoren p\u00ebr m\u00eb tep\u00ebr \"zonat e kuqe\" mbi baza modele, t\u00eb cilat z\u00ebn\u00eb hap\u00ebsir\u00ebn e memories q\u00eb nuk p\u00ebrdoret nga objektet, duke mbetur gjat\u00eb p\u00ebrputhjes s\u00eb madh\u00ebsis\u00eb s\u00eb faqeve t\u00eb memories. \u2014+\u2014\u2014+\u2014\u2014+\u2014\u2014+\u2014\u2014+\u2014\u2014 | xxxxxxxxx | O : | xxxxxxxxx | : O | xxxxxxxxx | | xxxxxxxxx | B : | xxxxxxxxx | : B | xxxxxxxxx | | x GUARD x | J : RED- | x GUARD x | RED- : J | x GUARD x | | xxxxxxxxx | E : ZONE | xxxxxxxxx | ZONE : E | xxxxxxxxx | | xxxxxxxxx | C : | xxxxxxxxx | : C | xxxxxxxxx | | xxxxxxxxx | T : | xxxxxxxxx | : T | xxxxxxxxx | \u2014+\u2014\u2014+\u2014\u2014+\u2014\u2014+\u2014\u2014+\u2014\u2014 <\/p>\n

N\u00eb rastin e nj\u00eb p\u00ebrpjekjeje p\u00ebr t'u aksesuar n\u00eb nj\u00eb zon\u00eb jasht\u00eb kufijve t\u00eb buffers, operacioni prek faqen mbrojt\u00ebse, \u00e7ka shkakton gjenerimin e \"page fault\", i cili kapet nga KFence dhe regjistron n\u00eb log t\u00eb dh\u00ebnat mbi problemin e identifikuar. Sipas parazgjedhjes, KFence nuk e bllokon gabimin dhe thjesht regjistron nj\u00eb paralajm\u00ebrim n\u00eb log, por ka nj\u00eb konfigurim \"panic_on_warn\", q\u00eb lejon n\u00eb rastin e identifikimit t\u00eb nj\u00eb gabimi t\u00eb \u00e7oj\u00eb b\u00ebrtham\u00ebn n\u00eb nj\u00eb gjendje kolapsi (panic).
\n
Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u043e\u0441\u0442\u0430\u0432 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e\u0441\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u044f\u0434\u0440\u0430 Linux 5.12 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 KFence (Kernel Electric Fence), \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0443 \u0441 \u043f\u0430\u043c\u044f\u0442\u044c\u044e, \u043e\u0442\u043b\u0430\u0432\u043b\u0438\u0432\u0430\u044f \u0432\u044b\u0445\u043e\u0434 \u0437\u0430 \u0433\u0440\u0430\u043d\u0438\u0446\u044b \u0431\u0443\u0444\u0435\u0440\u043e\u0432, \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u043e\u0441\u043b\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u0433\u043e \u043a\u043b\u0430\u0441\u0441\u0430. \u041f\u043e\u0434\u043e\u0431\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0443\u0436\u0435 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u043b\u0430 \u0432 \u044f\u0434\u0440\u0435 \u0432 \u0432\u0438\u0434\u0435 \u043e\u043f\u0446\u0438\u0438 \u0441\u0431\u043e\u0440\u043a\u0438 KASAN (kernel address sanitizer, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 Address Sanitizer \u0432 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 gcc […]<\/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-99293","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\udd47 N\u00eb b\u00ebrtham\u00ebn Linux 5.12 \u00ebsht\u00eb pranuar n\u00ebn-sistemi KFence p\u00ebr identifikimin e gabimeve gjat\u00eb pun\u00ebs me memorie | ProHoster","description":"N\u00eb b\u00ebrtham\u00ebn Linux 5.12, e cila \u00ebsht\u00eb n\u00eb zhvillim, \u00ebsht\u00eb p\u00ebrfshir\u00eb implementimi i mekanizmit KFence (Kernel Electric Fence), i cili kontrollon pun\u00ebn me memorien, duke kapur daljet p\u00ebrtej kufijve t\u00eb bufereve dhe qasjen n\u00eb memorie pas.","canonical_url":"https:\/\/prohoster.info\/sq\/blog\/news\/v-yadro-linux-5-12-prinyata-podsistema-kfence-dlya-vyyavleniya-oshibok-pri-rabote-s-pamyatyu","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sq_AL","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 \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412 \u044f\u0434\u0440\u043e Linux 5.12 \u043f\u0440\u0438\u043d\u044f\u0442\u0430 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 KFence \u0434\u043b\u044f \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u0448\u0438\u0431\u043e\u043a \u043f\u0440\u0438 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