{"id":82793,"date":"2020-05-25T07:41:55","date_gmt":"2020-05-25T05:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/70-problem-s-bezopasnostyu-v-chromium-vyzvany-oshibkami-pri-rabote-s-pamyatyu"},"modified":"2020-05-25T07:41:55","modified_gmt":"2020-05-25T05:41:55","slug":"70-problem-s-bezopasnostyu-v-chromium-vyzvany-oshibkami-pri-rabote-s-pamyatyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/70-problem-s-bezopasnostyu-v-chromium-vyzvany-oshibkami-pri-rabote-s-pamyatyu","title":{"rendered":"70% Chromiumi turvaprobleeme tulenevad m\u00e4lu t\u00f6\u00f6tlemise vigadest.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Chromium projekti arendajad <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/Home\/chromium-security\/memory-safety\">anal\u00fc\u00fcsisid<\/a><\/noindex> 912 ohtlikku ja kriitilist haavatavust, mis on avastatud stabiilsetes Chrome'i v\u00e4ljaannetes alates 2015. aastast, ja leitud, et 70% neist tulenesid ebaturvalisest m\u00e4luhaldusest (pointers'iga seotud vead C\/C++ koodis). Pool sellest probleemist (36.1%) on p\u00f5hjustatud m\u00e4lust vabastatud m\u00e4lut\u00fckkide kasutamisest (use-after-free).<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/_\/rsrc\/1589581287612\/Home\/chromium-security\/memory-safety\/piechart.png\"><img decoding=\"async\" alt=\"70% Chromiumi turvaprobleeme tulenevad m\u00e4lu t\u00f6\u00f6tlemise vigadest.\" src=\"\/wp-content\/uploads\/2020\/05\/31912b956dc2548e17b682d29dbab909.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Chromium'i kavandamisel oli algselt <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/Home\/chromium-security\/guts\">paigutatud<\/a><\/noindex>, et koodis v\u00f5ivad esineda vead, seet\u00f5ttu pandi suur r\u00f5hk liivakasti isolatsiooni rakendamisele haavatavuste tagaj\u00e4rgede piiritlemiseks. Praegu on selle tehnoloogia rakendamise v\u00f5imalused saavutanud oma piiri ja edasine protsesside jagamine ei ole ressursikasutuse seisukohalt otstarbekas. <\/p>\n<p>Google rakendab oma koodibaasi turvalisuse tagamiseks ka &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/chromium.googlesource.com\/chromium\/src\/+\/master\/docs\/security\/rule-of-2.md\">kahe reegli<\/a><\/noindex>&#171;, mille kohaselt peab iga lisatud kood vastama mitte rohkem kui kahest kolmest tingimusest: t\u00f6\u00f6tamine kontrollimata sisendandmetega, ohtliku programmeerimiskeele (C\/C++) kasutamine ning elevantsete privileegide all t\u00f6\u00f6tamine. Sellest reeglist tuleneb, et v\u00e4liste andmete t\u00f6\u00f6tlemiseks m\u00f5eldud kood peab kas olema v\u00e4hendatud minimaalsetele privileegidele (isoleeritud) v\u00f5i olema kirjutatud turvalises programmeerimiskeeles.<\/p>\n<p>Koodibaasi turvalisuse edasiarendamiseks on k\u00e4ivitatud projekt m\u00e4luhalduse vigade ennetamiseks koodibaasis. Peamised l\u00e4henemisviisid on: C++ raamatukogude loomine, mis sisaldavad funktsioone m\u00e4luga turvaliseks t\u00f6\u00f6tamiseks ja pr\u00fcgikogumise ulatuse laiendamine, riistvaraliste kaitsemehhanismide rakendamine <noindex><a rel=\"nofollow\" href=\"https:\/\/llvm.org\/devmtg\/2018-10\/slides\/Serebryany-Stepanov-Tsyrklevich-Memory-Tagging-Slides-LLVM-2018.pdf\">MTE<\/a><\/noindex> (Memory Tagging Extension) ja komponentide kirjutamine keeli, mis tagavad m\u00e4luga turvalise t\u00f6\u00f6tamise (Java, Kotlin, JavaScript, Rust, Swift).<\/p>\n<p>Oodatakse, et t\u00f6\u00f6 keskendub kahele suunale: <\/p>\n<ul>\n<li class=\"l\"> Oluline muudatus C++ arendamisprotsessis, mis ei v\u00e4lista negatiivset m\u00f5ju j\u00f5udlusele (t\u00e4iendavad piiride kontrollid ja pr\u00fcgikogumine). Raw-punktide asemel pakutakse koodis kasutada t\u00fc\u00fcpi <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1pnnOAIz_DMWDI4oIOFoMAqLnf_MZ2GsrJNb_dbQ3ZBg\/edit#heading=h.jx7cpliyfer\">MiraclePtr<\/a><\/noindex>, mis v\u00f5imaldab v\u00e4hendada kuritegelikke use-after-free vigu mitte-turvalistele krahhidele, ilma m\u00e4rkimisv\u00e4\u00e4rse negatiivse m\u00f5juta j\u00f5udlusele, m\u00e4lukasutusele ja stabiilsusele.\n<li class=\"l\"> Kasutades keeli, mis on m\u00f5eldud m\u00e4lu turvalise kasutamise kontrollide teostamiseks kompileerimise ajal (see v\u00e4listab koodi k\u00e4itamise ajal sarnaste kontrollide negatiivse m\u00f5ju j\u00f5udlusele, kuid toob kaasa t\u00e4iendavad kulud, et korraldada uue keele koodi koost\u00f6\u00f6 C++-koodiga).\n<\/ul>\n<p>M\u00e4lu turvaliseks kasutamiseks raamatukogude kasutamine on k\u00f5ige lihtsam, kuid ka v\u00e4hem efektiivne meetod. Koodi \u00fcmberkirjutamine Rust'i on hinnatud kui k\u00f5ige efektiivsem, kuid ka v\u00e4ga kallis tee.<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/a77db9aa-a-7b23c8ea-s-sites.googlegroups.com\/a\/chromium.org\/dev\/Home\/chromium-security\/memory-safety\/sat3CHOc8lXZbGicChW6w5Q.png?attachauth=ANoY7cqyfZiTko5osYGVMP1ewI31nrE7lTP8m8fXIDsqh42vdzKk9CPyjYMd54R7RUD3QviaGPZKpgWTOFblPaSIGPePPGlMbi9rN1ZbO4lhXjP7mfoJCt5i_m7cFFFesGuNIVU0hjjc7M-FTXLyjc_YqMxC7-NUPaFMZe_83_IuUY6frEvOHBZ-6AxVa-PU49aLScaDVt6z3SSF1krIhvKgjaZjUeI0hhgKDayLg13AFRHUidIJd5wnbvomNQyzuH3wD6DxMfh2lrQ6EK3hK7RTMw-eMeWAEw%3D%3D&#038;attredirects=0\"><img decoding=\"async\" alt=\"70% Chromiumi turvaprobleeme tulenevad m\u00e4lu t\u00f6\u00f6tlemise vigadest.\" src=\"\/wp-content\/uploads\/2020\/05\/48aac9ae5a251323dddebf73dfa73286.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a 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\u043d\u0438\u0445 \u0431\u044b\u043b\u0438 \u0432\u044b\u0437\u0432\u0430\u043d\u044b \u043d\u0435\u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u043e\u0439 \u0441 \u043f\u0430\u043c\u044f\u0442\u044c\u044e (\u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044f\u043c\u0438 \u0432 \u043a\u043e\u0434\u0435 \u043d\u0430 C\/C++). \u041f\u043e\u043b\u043e\u0432\u0438\u043d\u0430 \u0438\u0437 \u0434\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c (36.1%) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f\u043c\u0438 \u043a \u0431\u0443\u0444\u0435\u0440\u0443 \u043f\u043e\u0441\u043b\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0439 \u0441 \u043d\u0438\u043c \u043f\u0430\u043c\u044f\u0442\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":82794,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-82793","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Chromium \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043b\u0438 912 \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, 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