{"id":34721,"date":"2019-10-31T22:00:00","date_gmt":"2019-10-31T19:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/plany-po-usileniyu-mehanizma-zashhity-w-x-v-openbsd\/"},"modified":"2019-10-31T22:00:00","modified_gmt":"2019-10-31T19:00:00","slug":"plany-po-usileniyu-mehanizma-zashhity-w-x-v-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/plany-po-usileniyu-mehanizma-zashhity-w-x-v-openbsd","title":{"rendered":"A W^X v\u00e9delmi mechanizmus meger\u0151s\u00edt\u00e9s\u00e9re vonatkoz\u00f3 tervek az OpenBSD-ben.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Theo De Raadt <noindex><a rel=\"nofollow\" href=\"https:\/\/marc.info\/?l=openbsd-tech&#038;m=155899373514678&#038;w=2\">megosztotta<\/a><\/noindex> a mem\u00f3ria W^X (Write XOR Execute) v\u00e9delmi mechanizmus\u00e1nak meger\u0151s\u00edt\u00e9s\u00e9re ir\u00e1nyul\u00f3 tervekkel. A mechanizmus l\u00e9nyege, hogy a folyamat mem\u00f3ri\u00e1j\u00e1nak oldala nem lehet egyszerre \u00edr\u00e1si \u00e9s v\u00e9grehajt\u00e1si hozz\u00e1f\u00e9r\u00e9ssel el\u00e9rhet\u0151. \u00cdgy a k\u00f3d csak \u00edr\u00e1s tilalm\u00e1nak felold\u00e1sa ut\u00e1n futtathat\u00f3, m\u00edg a mem\u00f3ria oldalra val\u00f3 \u00edr\u00e1s csak v\u00e9grehajt\u00e1s tilalm\u00e1nak felold\u00e1sa ut\u00e1n lehets\u00e9ges. A W^X mechanizmus seg\u00edt megv\u00e9deni a felhaszn\u00e1l\u00f3i t\u00e9rben l\u00e9v\u0151 alkalmaz\u00e1sokat a tipikus t\u00e1mad\u00e1sokt\u00f3l, amelyeket puffert\u00falcsordul\u00e1s \u00fatj\u00e1n hajtanak v\u00e9gre, bele\u00e9rtve a veremt\u00falcsordul\u00e1sokat, \u00e9s akt\u00edv az OpenBSD-ben. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44506\">alap\u00e9rtelmezett<\/a><\/noindex>.<\/p>\n<p>A W^X-ra vonatkoz\u00f3 munk\u00e1latok megkezd\u00e9sekor nyilv\u00e1nval\u00f3 volt, hogy ez hossz\u00fa \u00fat lesz, mivel jelent\u0151s sz\u00e1m\u00fa JIT alkalmaz\u00e1s l\u00e9tezik. A JIT megval\u00f3s\u00edt\u00e1sokat h\u00e1rom kateg\u00f3ri\u00e1ra lehet osztani:<\/p>\n<ul>\n<li class=\"l\"> Az W \u00e9s X \u00e1llapotok k\u00f6z\u00f6tti v\u00e1lt\u00e1s, belenyugodva a rendszerh\u00edv\u00e1s \"k\u00f6lts\u00e9ge\". <noindex><a rel=\"nofollow\" href=\"https:\/\/man.openbsd.org\/mprotect.2\">mprotect<\/a><\/noindex>.\n<li class=\"l\"> Pseudonimokat l\u00e9trehoz\u00f3, amelyek ugyanazon mem\u00f3ria p\u00e1r W \u00e9s X lek\u00e9pez\u00e9s\u00e9vel \u00f6sszekapcsol\u00f3dnak.\n<li class=\"l\"> A leg \"piszkosabb\" lehet\u0151s\u00e9g - a W|X mem\u00f3ria modellek, amelyek lehet\u0151v\u00e9 teszik az \u00edr\u00e1s \u00e9s v\u00e9grehajt\u00e1s egyidej\u0171 v\u00e9grehajt\u00e1s\u00e1t.\n<\/ul>\n<p>Jelenleg jelent\u0151sen kevesebb program haszn\u00e1lja a harmadik lehet\u0151s\u00e9get, m\u00edg egyre t\u00f6bb az els\u0151 \u00e9s m\u00e1sodik. Mindazon\u00e1ltal, mivel sz\u00fcks\u00e9g volt W|X JIT programok futtat\u00e1s\u00e1ra (f\u0151k\u00e9nt a Chromium \u00e9s az Iridium), bevezet\u00e9sre ker\u00fclt a \"wxallowed\" f\u00e1jlrendszer-mont\u00e1l\u00e1si lehet\u0151s\u00e9g, amely lehet\u0151v\u00e9 tette a mem\u00f3ria egyidej\u0171 haszn\u00e1lat\u00e1t \u00edr\u00e1sra \u00e9s v\u00e9grehajt\u00e1sra, ha a v\u00e9grehajthat\u00f3 ELF f\u00e1jl \"wxneeded\" jel\u00f6l\u0151vel van megjel\u00f6lve, \u00e9s maguk az alkalmaz\u00e1sok tov\u00e1bbi v\u00e9delmet kaptak mechanizmusok felhaszn\u00e1l\u00e1s\u00e1val. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=43295\">pledge<\/a><\/noindex> \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49042\">unveil<\/a><\/noindex> a rendszervCalls felhaszn\u00e1l\u00e1s\u00e1nak \u00e9s az alkalmaz\u00e1s sz\u00e1m\u00e1ra el\u00e9rhet\u0151 f\u00e1jlrendszer r\u00e9szeinek list\u00e1j\u00e1nak korl\u00e1toz\u00e1s\u00e1ra vonatkoz\u00f3an.<\/p>\n<p>A hasonl\u00f3 alkalmaz\u00e1sok sebezhet\u0151s\u00e9geinek kihaszn\u00e1l\u00e1s\u00e1nak tov\u00e1bbi bonyol\u00edt\u00e1sa \u00e9rdek\u00e9ben javasolt egy kieg\u00e9sz\u00edt\u0151 mechanizmus bevezet\u00e9se, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48243\">MAP_STACK<\/a><\/noindex>, amely ellen\u0151rzi, hogy a rendszervCalls v\u00e9grehajt\u00e1sa egy \u00edr\u00e1sra el\u00e9rhet\u0151 mem\u00f3ri\u00e1b\u00f3l t\u00f6rt\u00e9nik-e. Ha az oldal \u00edr\u00e1sra el\u00e9rhet\u0151, a folyamat k\u00e9nyszer\u00edtve le\u00e1ll. \u00cdgy a t\u00e1mad\u00f3 nem tudja haszn\u00e1lni a rendszervCalls-t, \u00e9s k\u00e9nytelen lesz megpr\u00f3b\u00e1lni megtal\u00e1lni a sz\u00fcks\u00e9ges gadgeteket a JIT megval\u00f3s\u00edt\u00e1s\u00e1ban, vagy m\u00e9g nehezebb munk\u00e1t v\u00e9gezni a rendszervCalls t\u00fcsk\u00e9k nyomoz\u00e1s\u00e1val k\u00f6zvetlen\u00fcl a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44320\">v\u00e9letlen\u00fcl \u00f6sszekapcsolt libc-re.<\/a><\/noindex>. <\/p>\n<p>A Chrome\/Iron folyamatok m\u00e1r elegend\u0151en v\u00e9dettek a pledge \u00e9s unveil seg\u00edts\u00e9g\u00e9vel, de a write(2) rendszerh\u00edv\u00e1s haszn\u00e1lat\u00e1nak megtilt\u00e1sa nyilv\u00e1nval\u00f3an bizonyos el\u0151ny\u00f6kkel j\u00e1r, mivel tov\u00e1bbi neh\u00e9zs\u00e9geket okoz a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra. Mindazon\u00e1ltal probl\u00e9m\u00e1k mer\u00fclhetnek fel, ha a JIT implement\u00e1ci\u00f3 nat\u00edv rendszerh\u00edv\u00e1sokat haszn\u00e1l W|X mem\u00f3ri\u00e1b\u00f3l. Azonban van ok a rem\u00e9nyked\u00e9sre, hogy ezzel nem kell tal\u00e1lkozni, mivel az ABI t\u00f6bbsz\u00f6r is v\u00e1ltozott, de senki soha nem sz\u00e1molt be probl\u00e9m\u00e1kr\u00f3l.<\/p>\n<p>A v\u00e1ltoz\u00e1sok m\u00e1r el\u00e9rhet\u0151k az OpenBSD-CURRENT \u00e1gjaiban l\u00e9v\u0151 rendszer snapshotjaiban, minden \u00e9rdekl\u0151d\u0151t szeretettel v\u00e1runk a tesztel\u00e9sre.<\/p>\n<p>Theo a Chrome\/Iron \u00faj \u00fczemm\u00f3dj\u00e1val kapcsolatos h\u00edrekre k\u00edv\u00e1nt k\u00fcl\u00f6n megjegyz\u00e9st tenni. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50559\">JIT n\u00e9lk\u00fcli<\/a><\/noindex>. Ennek f\u00e9ny\u00e9ben ez elfogadhat\u00f3 egyes felhaszn\u00e1l\u00e1si modellek sz\u00e1m\u00e1ra, azonban val\u00f3sz\u00edn\u0171leg nem minden esetben, mivel ebben az \u00fczemm\u00f3dban nyilv\u00e1nval\u00f3an megn\u0151 a processzor terhelts\u00e9ge. Jelenleg a Chrome els\u0151sorban akkor m\u0171k\u00f6dik, ha a \"wxallowed\" lehet\u0151s\u00e9g ki van kapcsolva a \/usr\/local mapp\u00e1ban, b\u00e1r n\u00e9h\u00e1ny b\u0151v\u00edtm\u00e9nnyel (p\u00e9ld\u00e1ul a ghostery-vel) val\u00f3sz\u00edn\u0171leg probl\u00e9m\u00e1k mer\u00fclnek fel. Ak\u00e1rhogy is, Theo rem\u00e9li, hogy a JITless \u00fczemm\u00f3dbeli teljes m\u0171k\u00f6d\u00e9s a k\u00f6zelj\u00f6v\u0151ben teljesen m\u0171k\u00f6d\u0151k\u00e9pes lesz.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50763\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0422\u0435\u043e \u0414\u0435 \u0420\u0430\u0430\u0434\u0442 \u043f\u043e\u0434\u0435\u043b\u0438\u043b\u0441\u044f \u043f\u043b\u0430\u043d\u0430\u043c\u0438 \u043f\u043e \u0443\u0441\u0438\u043b\u0435\u043d\u0438\u044e \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u043f\u0430\u043c\u044f\u0442\u0438 W^X (Write XOR Execute). \u0421\u0443\u0442\u044c \u043c\u0435\u0445\u043d\u0438\u0437\u043c\u0430 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 \u043d\u0435 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c \u0438 \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043a\u043e\u0434 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u043f\u0440\u0435\u0449\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0438\u0441\u0438, \u0430 \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0443 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u043f\u0440\u0435\u0442\u0430 \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f. \u041c\u0435\u0445\u0430\u043d\u0438\u0437\u043c W^X \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0437\u0430\u0449\u0438\u0442\u0438\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-34721","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0422\u0435\u043e \u0414\u0435 \u0420\u0430\u0430\u0434\u0442 \u043f\u043e\u0434\u0435\u043b\u0438\u043b\u0441\u044f \u043f\u043b\u0430\u043d\u0430\u043c\u0438 \u043f\u043e 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