{"id":148818,"date":"2025-11-19T11:11:55","date_gmt":"2025-11-19T09:11:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/mnogochasovoj-sboj-cloudflare-okazalsya-rezultatom-nekorrektnoj-obrabotki-oshibok"},"modified":"2025-11-19T11:11:55","modified_gmt":"2025-11-19T09:11:57","slug":"mnogochasovoj-sboj-cloudflare-okazalsya-rezultatom-nekorrektnoj-obrabotki-oshibok","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/mnogochasovoj-sboj-cloudflare-okazalsya-rezultatom-nekorrektnoj-obrabotki-oshibok","title":{"rendered":"Den fler\u00e5riga Cloudflare-st\u00f6rningen visade sig vara resultatet av felaktig felhantering.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Cloudflare har publicerat en analys av en av de st\u00f6rsta incidenterna i sin infrastruktur, vilket ledde till att en stor del av n\u00e4tverket f\u00f6r inneh\u00e5llsleverans inte fungerade under mer \u00e4n 3 timmar. Felet intr\u00e4ffade efter en f\u00f6r\u00e4ndring i strukturen av databasen som lagrades i ClickHouse, vilket resulterade i att filen med parametrarna f\u00f6r systemet mot botar f\u00f6rdubblades i storlek. Det skapades duplicerade tabeller i databasen, medan SQL-fr\u00e5gan f\u00f6r att generera filen helt enkelt h\u00e4mtade all data fr\u00e5n alla tabeller med nyckeln, utan att sortera bort dubbletter. SELECT name, type FROM system.columns WHERE table = 'http_requests_features' order by name;

\"Den<\/center> <\/p>\n

Den skapade filen spreds \u00f6ver alla noder i klustret som hanterar inkommande f\u00f6rfr\u00e5gningar. I hanteraren, som anv\u00e4nde denna fil f\u00f6r att verifiera bot-anrop, sparades parametrarna i filen i arbetsminnet och f\u00f6r att skydda mot \u00f6verdriven minnesanv\u00e4ndning fanns det en gr\u00e4ns f\u00f6r maximalt till\u00e5ten filstorlek i koden. Under normala f\u00f6rh\u00e5llanden var den faktiska filstorleken betydligt mindre \u00e4n den angivna gr\u00e4nsen, men efter att tabellerna duplicerades \u00f6verskred den denna gr\u00e4ns. <\/p>\n

Problemet var att ist\u00e4llet f\u00f6r att korrekt hantera \u00f6verskridandet av gr\u00e4nsen och forts\u00e4tta anv\u00e4nda den tidigare versionen av filen med information till \u00f6vervakningssystemet om en n\u00f6dsituation, intr\u00e4ffade en krasch i hanteraren som blockerade ytterligare trafik. Felet orsakades av anv\u00e4ndningen av metoden unwrap() i Rust-koden med typen Result.

\"Den<\/center> <\/p>\n

N\u00e4r v\u00e4rdet Result har tillst\u00e5ndet 'Ok' returnerar metoden unwrap() det objekt som \u00e4r kopplat till detta tillst\u00e5nd, men om resultatet inte \u00e4r framg\u00e5ngsrikt leder anropet till ett kraschat program (makrot 'panic!' anropas). Oftast anv\u00e4nds unwrap() under fels\u00f6kning eller n\u00e4r man skriver testkod och rekommenderas inte f\u00f6r anv\u00e4ndning i produktionsprojekt.

\"Den<\/center>
\"Den<\/center>
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0431\u043e\u043b\u0435\u0435 3 \u0447\u0430\u0441\u043e\u0432. \u0421\u0431\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u043e\u0448\u0451\u043b \u043f\u043e\u0441\u043b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435 \u0411\u0414, \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d\u043d\u043e\u0439 \u0432 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 ClickHouse, \u043f\u043e\u0441\u043b\u0435 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0444\u0430\u0439\u043b \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u0440\u043e\u0442\u0438\u0432\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0431\u043e\u0442\u0430\u043c \u0432 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430 \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u043b\u0441\u044f \u0432 \u0440\u0430\u0437\u043c\u0435\u0440\u0435. \u0412 \u0411\u0414 \u0431\u044b\u043b\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":148819,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-148818","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Timsl\u00e5ng driftst\u00f6rning hos Cloudflare var resultatet av bristf\u00e4llig felhantering | ProHoster","description":"Cloudflare har publicerat en analys av ett av de st\u00f6rsta incidenterna i sin infrastruktur, vilket resulterade i att en stor del av inneh\u00e5llsleveransn\u00e4tverket var otillg\u00e4ngligt i \u00f6ver 3 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