{"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\/novosti-interneta\/v-yadro-linux-5-12-prinyata-podsistema-kfence-dlya-vyyavleniya-oshibok-pri-rabote-s-pamyatyu","title":{"rendered":"N\u00eb kernin Linux 5.12 \u00ebsht\u00eb pranuar n\u00ebn-sistemi KFence p\u00ebr identifikimin e gabimeve gjat\u00eb pun\u00ebs me memorien.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
N\u00eb versionin e zhvillimit t\u00eb kernit Linux 5.12 \u00ebsht\u00eb p\u00ebrfshir\u00eb implementimi i mekanizmit KFence (Kernel Electric Fence), i cili kontrollon aksesin n\u00eb memorie, duke kapur tejkalimin e kufijve t\u00eb bufeve, qasjet n\u00eb memorie pas lirimit dhe gabime t\u00eb ngjashme. <\/p>\n
Nj\u00eb funksionalitet i till\u00eb ka qen\u00eb tashm\u00eb i pranish\u00ebm n\u00eb b\u00ebrthama n\u00eb form\u00ebn e opsionit t\u00eb nd\u00ebrtimit KASAN (kernel address sanitizer, p\u00ebrdor Address Sanitizer n\u00eb gcc dhe clang moderne) \u2014 megjithat\u00eb, \u00ebsht\u00eb pozicionuar kryesisht p\u00ebr p\u00ebrdorim n\u00eb debug. NSubstema KFence dallohet nga KASAN p\u00ebr shpejt\u00ebsin\u00eb e saj t\u00eb lart\u00eb, e cila e lejon p\u00ebrdorimin e k\u00ebsaj mund\u00ebsie madje edhe n\u00eb b\u00ebrthamat e sistemeve t\u00eb pun\u00ebs. <\/p>\n
P\u00ebrdorimi n\u00eb sistemet e pun\u00ebs do t\u00eb mund\u00ebsoj\u00eb kapjen e gabimeve t\u00eb pun\u00ebs me memorien, t\u00eb cilat nuk shfaqen n\u00eb testimet e zakonshme dhe dalin n\u00eb pah vet\u00ebm n\u00eb ngarkesa operative ose gjat\u00eb funksionimit t\u00eb gjat\u00eb (n\u00eb uptime t\u00eb madh). P\u00ebr m\u00eb tep\u00ebr, aplikimi i KFence n\u00eb sistemet e pun\u00ebs do t\u00eb rris\u00eb ndjesh\u00ebm numrin e makinave t\u00eb p\u00ebrfshira n\u00eb kontrollin e funksionimit t\u00eb kernit me memorien. <\/p>\n
KFence siguron kosto minimale t\u00eb menaxhimit, t\u00eb pavarura nga ngarkesa, duke prezantuar faqe mbrojt\u00ebse (guard pages) n\u00eb grumbull p\u00ebrmes intervaleve fikse. Pasi t\u00eb kaloj\u00eb koha e intervalit t\u00eb mbrojtjes, KFence p\u00ebrmes sistemit standard t\u00eb ndarjes s\u00eb memories (SLAB ose SLUB allocator) shton nj\u00eb faqe mbrojt\u00ebse t\u00eb re nga grupi i objekteve KFence dhe fillon nj\u00eb raport t\u00eb ri t\u00eb num\u00ebratorit t\u00eb koh\u00ebs. \u00c7do objekt KFence vendoset n\u00eb nj\u00eb faqe t\u00eb ve\u00e7ant\u00eb t\u00eb memories, nd\u00ebrsa faqet e memories n\u00eb kufijt\u00eb e majt\u00eb dhe t\u00eb djatht\u00eb formojn\u00eb faqet mbrojt\u00ebse (guard pages), p\u00ebrmasat e t\u00eb cilave zgjidhen rast\u00ebsisht. <\/p>\n
K\u00ebshtu, faqet me objekte ndaj nj\u00ebra-tjetr\u00ebs ndahen me faqet e mbrojtjes, t\u00eb cilat konfigurohen p\u00ebr t\u00eb gjeneruar \"page fault\" n\u00eb \u00e7do k\u00ebrkes\u00eb. P\u00ebr t\u00eb zbuluar operacionet e shkruar jasht\u00eb buffer-it brenda faqeve me objekte, p\u00ebrdoren gjithashtu \"zona t\u00eb kuqe\" t\u00eb bazuara n\u00eb modele, t\u00eb cilat z\u00ebn\u00eb memorjen q\u00eb nuk p\u00ebrdoret nga objektet dhe mbetet gjat\u00eb rregullimit t\u00eb madh\u00ebsis\u00eb s\u00eb faqeve t\u00eb memories. <\/p>\n
N\u00eb rastin e nj\u00eb p\u00ebrpjekjeje p\u00ebr t\u00eb hyr\u00eb n\u00eb nj\u00eb zon\u00eb jasht\u00eb kufijve t\u00eb memories, operacioni prek faqen mbrojt\u00ebse, duke \u00e7uar n\u00eb gjenerimin e \"page fault\" q\u00eb kapet nga KFence dhe regjistron informacionin mbi problematik\u00ebn e zbuluar. N\u00eb parazgjedhje, KFence nuk bllokon gabimin dhe vet\u00ebm jep nj\u00eb paralajm\u00ebrim n\u00eb log, por ekziston nj\u00eb konfigurim \"panic_on_warn\" q\u00eb lejon q\u00eb n\u00eb rast t\u00eb zbulimit t\u00eb nj\u00eb gabimi, b\u00ebrthama t\u00eb kaloj\u00eb n\u00eb nj\u00eb gjendje d\u00ebshtimi (panic). \n Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"