{"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\/pl\/blog\/news\/70-problem-s-bezopasnostyu-v-chromium-vyzvany-oshibkami-pri-rabote-s-pamyatyu","title":{"rendered":"70% problem\u00f3w z bezpiecze\u0144stwem w Chromium jest spowodowanych b\u0142\u0119dami w zarz\u0105dzaniu pami\u0119ci\u0105","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Deweloperzy projektu Chromium <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/Home\/chromium-security\/memory-safety\">przeanalizowali<\/a><\/noindex> Zidentyfikowano 912 niebezpiecznych i krytycznych luk w stabilnych wydaniach Chrome od 2015 roku i stwierdzono, \u017ce 70% z nich by\u0142o spowodowanych niebezpiecznym zarz\u0105dzaniem pami\u0119ci\u0105 (b\u0142\u0119dami zwi\u0105zanymi z wska\u017anikami w kodzie C\/C++). Po\u0142owa z tych problem\u00f3w (36,1%) wynika\u0142a z odwo\u0142a\u0144 do bufora po zwolnieniu zwi\u0105zanej z nim pami\u0119ci (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% problem\u00f3w z bezpiecze\u0144stwem w Chromium jest spowodowanych b\u0142\u0119dami w zarz\u0105dzaniu pami\u0119ci\u0105\" src=\"\/wp-content\/uploads\/2020\/05\/31912b956dc2548e17b682d29dbab909.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Podczas projektowania Chromium pierwotnie <noindex><a rel=\"nofollow\" href=\"https:\/\/www.chromium.org\/Home\/chromium-security\/guts\">zak\u0142adano<\/a><\/noindex>, \u017ce w kodzie mog\u0105 wyst\u0119powa\u0107 b\u0142\u0119dy, dlatego du\u017cy nacisk k\u0142adziono na zastosowanie izolacji sandboxowej w celu ograniczenia skutk\u00f3w wyst\u0105pienia luk. Obecnie mo\u017cliwo\u015bci wdro\u017cenia tej technologii osi\u0105gn\u0119\u0142y swoje granice, a dalsze rozdzielanie na procesy jest nieuzasadnione ze wzgl\u0119du na zu\u017cycie zasob\u00f3w. <\/p>\n<p>Aby utrzyma\u0107 bezpiecze\u0144stwo bazy kodu, Google stosuje r\u00f3wnie\u017c \u201e<noindex><a rel=\"nofollow\" href=\"https:\/\/chromium.googlesource.com\/chromium\/src\/+\/master\/docs\/security\/rule-of-2.md\">zasad\u0119 dw\u00f3ch<\/a><\/noindex>\u201e, zgodnie z kt\u00f3rym ka\u017cdy dodawany kod musi spe\u0142nia\u0107 nie wi\u0119cej ni\u017c dwa z trzech warunk\u00f3w: pracowa\u0107 z niezweryfikowanymi danymi wej\u015bciowymi, u\u017cywa\u0107 niebezpiecznego j\u0119zyka programowania (C\/C++) oraz dzia\u0142a\u0107 z podwy\u017cszonymi poziomami uprawnie\u0144. Z tej zasady wynika, \u017ce kod do obs\u0142ugi danych zewn\u0119trznych musi by\u0107 albo ograniczony do minimalnych uprawnie\u0144 (izolowany), albo napisany w bezpiecznym j\u0119zyku programowania.<\/p>\n<p>Aby dodatkowo wzmocni\u0107 bezpiecze\u0144stwo bazy kodu, uruchomiono projekt maj\u0105cy na celu zapobieganie wyst\u0119powaniu b\u0142\u0119d\u00f3w zarz\u0105dzania pami\u0119ci\u0105 w bazie kodu. Wyr\u00f3\u017cnia si\u0119 trzy g\u0142\u00f3wne podej\u015bcia: tworzenie bibliotek C++ z funkcjami bezpiecznego zarz\u0105dzania pami\u0119ci\u0105 oraz rozszerzenie zastosowania zbieracza \u015bmieci, zastosowanie mechanizm\u00f3w ochrony sprz\u0119towej <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) oraz pisanie komponent\u00f3w w j\u0119zykach zapewniaj\u0105cych bezpieczne zarz\u0105dzanie pami\u0119ci\u0105 (Java, Kotlin, JavaScript, Rust, Swift).<\/p>\n<p>Oczekuje si\u0119, \u017ce prace b\u0119d\u0105 skoncentrowane na dw\u00f3ch kierunkach: <\/p>\n<ul>\n<li class=\"l\"> Znacz\u0105ca zmiana w procesie rozwoju w C++, kt\u00f3ra mo\u017ce negatywnie wp\u0142yn\u0105\u0107 na wydajno\u015b\u0107 (dodatkowe sprawdzenia granic i zbieranie \u015bmieci). Zamiast wska\u017anik\u00f3w raw proponuje si\u0119 u\u017cycie w kodzie typu <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.google.com\/document\/d\/1pnnOAIz_DMWDI4oIOFoMAqLnf_MZ2GsrJNb_dbQ3ZBg\/edit#heading=h.jx7cpliyfer\">MiraclePtr<\/a><\/noindex>, kt\u00f3ry pozwala zredukowa\u0107 exploitable b\u0142\u0119dy klasy use-after-free do niegro\u017anych awarii, bez znacz\u0105cego negatywnego wp\u0142ywu na wydajno\u015b\u0107, zu\u017cycie pami\u0119ci i stabilno\u015b\u0107.\n<li class=\"l\"> Wykorzystanie j\u0119zyk\u00f3w zaprojektowanych do przeprowadzania sprawdzania bezpiecznej obs\u0142ugi pami\u0119ci podczas kompilacji (pozwoli to wyeliminowa\u0107 negatywny wp\u0142yw na wydajno\u015b\u0107, typowy dla takich sprawdze\u0144 podczas wykonywania kodu, ale wi\u0105\u017ce si\u0119 z dodatkowymi kosztami organizacji interakcji kodu w nowym j\u0119zyku z kodem w C++).\n<\/ul>\n<p>U\u017cycie bibliotek do bezpiecznej obs\u0142ugi pami\u0119ci jest najprostszym, ale te\u017c mniej wydajnym rozwi\u0105zaniem. Przepisanie kodu w Rust jest oceniane jako najbardziej efektywne, ale r\u00f3wnie\u017c bardzo kosztowne podej\u015bcie.<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% problem\u00f3w z bezpiecze\u0144stwem w Chromium jest spowodowanych b\u0142\u0119dami w zarz\u0105dzaniu pami\u0119ci\u0105\" 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>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53019\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0432 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 Chrome \u0441 2015 \u0433\u043e\u0434\u0430, \u0438 \u043f\u0440\u0438\u0448\u043b\u0438 \u043a \u0432\u044b\u0432\u043e\u0434\u0443, \u0447\u0442\u043e 70% \u0438\u0437 \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 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