{"id":164600,"date":"2026-03-14T11:12:15","date_gmt":"2026-03-14T09:12:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/sqlite-3-51-3-s-ispravleniem-vozmozhnogo-povrezhdeniya-bazy-dannyh-v-rezhime-wal"},"modified":"2026-03-14T11:12:15","modified_gmt":"2026-03-14T09:12:15","slug":"sqlite-3-51-3-s-ispravleniem-vozmozhnogo-povrezhdeniya-bazy-dannyh-v-rezhime-wal","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/sqlite-3-51-3-s-ispravleniem-vozmozhnogo-povrezhdeniya-bazy-dannyh-v-rezhime-wal","title":{"rendered":"SQLite 3.51.3 med fix f\u00f6r m\u00f6jligt databas\u00f6verskridande i WAL-l\u00e4get.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"SQLite 3.51.3 med fix f\u00f6r m\u00f6jligt databas\u00f6verskridande i WAL-l\u00e4get.\" src=\"\/wp-content\/uploads\/2026\/03\/3c442654f8b6d86974735255e8214cfe.jpg\" style=\"display:block;margin: 0 auto;\" \/>                              <noindex>      <noindex><\/p>\n<p>Den 13 mars genomf\u00f6rdes en korrigerande version 3.51.3 av den kompakt inb\u00e4ddade databashanteraren. <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\">SQLite<\/a>. Projektkoden \u00e4r skriven i C och distribueras som offentlig egendom (public domain).<\/p>\n<p><\/noindex><\/noindex> <noindex><\/p>\n<p>P\u00e5 grund av bak\u00e5tkompatibilitetsproblem relaterade till vissa nya funktioner drogs versionen <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/releaselog\/3_52_0.html\">3.52.0<\/a> (som sl\u00e4pptes den 6 mars) tillbaka.<\/p>\n<p><\/noindex>  <\/p>\n<p>\u00c4ndringslistan f\u00f6r version 3.51.3:<\/p>\n<ul>\n<li>Den 3 mars uppt\u00e4ckte och \u00e5tg\u00e4rdade en av SQLite:s utvecklare (Dan) en bugg som i s\u00e4llsynta fall kunde leda till att databasen blev korrupt, kallad <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/wal.html#walresetbug\">&laquo;WAL-reset bug&raquo;<\/a>:\n<ul>\n<li>Denna bugg uppst\u00e5r endast i databaser som k\u00f6rs i WAL-l\u00e4ge, om tv\u00e5 eller fler anslutningar \u00f6ppnas till samma fil i olika tr\u00e5dar eller processer, och om dessa tv\u00e5 anslutningar f\u00f6rs\u00f6ker skriva eller skapa en kontrollpunkt samtidigt.<\/li>\n<li>Buggen \u00e4r relaterad till datakonflikter under strikta tidsbegr\u00e4nsningar. Under normala driftsf\u00f6rh\u00e5llanden uppst\u00e5r den mycket s\u00e4llan. Utvecklarna kunde aldrig \u00e5terskapa buggen under naturliga f\u00f6rh\u00e5llanden, och de var tvungna att l\u00e4gga till s\u00e4rskild testlogik i SQLite som avsiktligt skapar f\u00f6rh\u00e5llanden f\u00f6r att \u00e5terskapa buggen, f\u00f6r att s\u00e4kerst\u00e4lla att problemet var l\u00f6st.<\/li>\n<li>Buggen uppst\u00e5r n\u00e4r:\n<ol>\n<li>En anslutning genomf\u00f6r en kontrollpunkt. Denna f\u00f6rsta kontrollpunkt m\u00e5ste slutf\u00f6ras. Med andra ord, under kontrollpunkten m\u00e5ste hela inneh\u00e5llet i WAL-filen framg\u00e5ngsrikt kopieras tillbaka till databasen och WAL-filen \u00e5terst\u00e4llas s\u00e5 att den kan \u00e5terst\u00e4llas.<\/li>\n<li>S\u00e5 snart den f\u00f6rsta kontrollpunkten \u00e4r klar, startar en andra.<\/li>\n<li>Medan den andra kontrollpunkten fr\u00e5n steg 2 k\u00f6rs, registrerar en annan databasanslutning en transaktion som \u00e5terst\u00e4ller WAL-filen och skriver nytt inneh\u00e5ll i b\u00f6rjan av WAL-filen.<\/li>\n<li>P\u00e5 grund av datakonflikten beaktar inte den andra kontrollpunkten fr\u00e5n steg 2 att WAL-filen har \u00e5terst\u00e4llts till f\u00f6ljd av transaktionen i steg 3. Den andra kontrollpunkten s\u00e4tter ett felaktigt v\u00e4rde f\u00f6r ett av f\u00e4lten i WAL-indexhuvudet. Detta f\u00e4lt anger att en del av WAL-filen redan har registrerats i kontrollpunkten, \u00e4ven om s\u00e5 inte \u00e4r fallet.<\/li>\n<li>Registrering av ytterligare transaktioner leder till en \u00f6kning av antalet sidor i WAL-filen, vilket \u00f6verstiger antalet sidor som fanns vid den f\u00f6rsta kontrollpunkten fr\u00e5n steg 1.<\/li>\n<li>Senare, n\u00e4r den tredje kontrollpunkten intr\u00e4ffar, hoppar den \u00f6ver hela eller delar av transaktionen som registrerades i steg 3. D\u00e4rmed n\u00e5r delar av transaktionen fr\u00e5n steg 3 aldrig databasfilen, vilket resulterar i att databasfilen skadas.<\/li>\n<\/ol>\n<\/li>\n<li>Felet finns troligen i alla versioner av SQLite, fr\u00e5n 3.7.0 (21.07.2010) till 3.51.2. Korrigeringar har ocks\u00e5 sl\u00e4ppts f\u00f6r vissa tidigare versioner: <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/info\/863c171b76cd36e0\">3.44.6<\/a> och <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/info\/c7facf7ac58d2cda\">3.50.7<\/a>.<\/li>\n<\/ul>\n<\/li>\n<li>Andra mindre korrigeringar.<\/li>\n<\/ul>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/opensource\/18241537\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>13-\u0433\u043e \u043c\u0430\u0440\u0442\u0430 \u0441\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a 3.51.3 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0439 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0421\u0423\u0411\u0414 SQLite. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 C \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0434\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 (public domain). \u0412 \u0441\u0432\u044f\u0437\u0438 \u0441 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u0439 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u043c\u0438 \u0441 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u043c\u0438 \u043d\u043e\u0432\u044b\u043c\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c\u0438, \u0432\u0435\u0440\u0441\u0438\u044f 3.52.0 (\u0432\u044b\u0448\u0435\u0434\u0448\u0430\u044f 6-\u0433\u043e \u043c\u0430\u0440\u0442\u0430) \u0431\u044b\u043b\u0430 \u043e\u0442\u043e\u0437\u0432\u0430\u043d\u0430. \u0421\u043f\u0438\u0441\u043e\u043a \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 3.51.3: 3-\u0433\u043e \u043c\u0430\u0440\u0442\u0430 \u043e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 SQLite (Dan) \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0438\u043b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":164601,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-164600","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta 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