{"id":106545,"date":"2023-01-29T12:48:46","date_gmt":"2023-01-29T10:48:46","guid":{"rendered":"https:\/\/prohoster.info\/?p=106545"},"modified":"2023-02-07T12:09:03","modified_gmt":"2023-02-07T10:09:03","slug":"zavisimost-vremeni-vypolneniya-instrukczij-ot-dannyh-na-cpu-arm-i-intel","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/zavisimost-vremeni-vypolneniya-instrukczij-ot-dannyh-na-cpu-arm-i-intel","title":{"rendered":"Az utas\u00edt\u00e1sok v\u00e9grehajt\u00e1si idej\u00e9nek f\u00fcgg\u0151s\u00e9ge az ARM \u00e9s Intel CPU adatait\u00f3l","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Eric Biggers, az Adiantum titkos\u00edt\u00f3 algoritmus egyik fejleszt\u0151je \u00e9s a Linux fscrypt kernel alrendszer\u00e9nek karbantart\u00f3ja, egy jav\u00edt\u00f3csomagot javasolt a biztons\u00e1gi probl\u00e9m\u00e1k kezel\u00e9s\u00e9re, amelyek az Intel processzorok jellemz\u0151ib\u0151l ad\u00f3dnak, \u00e9s nem garant\u00e1lj\u00e1k az utas\u00edt\u00e1sok v\u00e9grehajt\u00e1si idej\u00e9nek \u00e1lland\u00f3s\u00e1g\u00e1t a k\u00fcl\u00f6nb\u00f6z\u0151 feldolgozott adatok eset\u00e9ben. Az Intel processzorokn\u00e1l a probl\u00e9ma az Ice Lake csal\u00e1dt\u00f3l kezd\u0151d\u0151en jelentkezik. Hasonl\u00f3 probl\u00e9ma figyelhet\u0151 meg az ARM processzorokn\u00e1l is. <\/p>\n

A jav\u00edt\u00f3csomag szerz\u0151je az utas\u00edt\u00e1sok adatait\u00f3l val\u00f3 f\u00fcgg\u0151s\u00e9get a processzorokban sebezhet\u0151s\u00e9gk\u00e9nt kezeli, mivel ez a viselked\u00e9s nem garant\u00e1lja a titkos\u00edt\u00e1si m\u0171veletek biztons\u00e1g\u00e1t a rendszeren bel\u00fcl. Sok titkos\u00edt\u00e1si algoritmus implement\u00e1ci\u00f3ja arra sz\u00e1m\u00edt, hogy az adatok nem befoly\u00e1solj\u00e1k az utas\u00edt\u00e1sok v\u00e9grehajt\u00e1si idej\u00e9t, \u00e9s ennek a viselked\u00e9snek a megs\u00e9rt\u00e9se oldals\u00f3 csatorn\u00e1s t\u00e1mad\u00e1sok l\u00e9trehoz\u00e1s\u00e1hoz vezethet, amelyek az adatok helyre\u00e1ll\u00edt\u00e1s\u00e1ra \u00e9p\u00edtenek az feldolgoz\u00e1si id\u0151elemz\u00e9s alapj\u00e1n. <\/p>\n

Hasonl\u00f3k\u00e9ppen, az adatokt\u00f3l val\u00f3 v\u00e9grehajt\u00e1si id\u0151 f\u00fcgg\u0151s\u00e9ge potenci\u00e1lisan felhaszn\u00e1lhat\u00f3 a kernel adatinak a felhaszn\u00e1l\u00f3i t\u00e9rb\u0151l val\u00f3 kik\u00f6vetkeztet\u00e9s\u00e9re ir\u00e1nyul\u00f3 t\u00e1mad\u00e1sokhoz. Eric Biggers nyilatkozata szerint az alap\u00e9rtelmezett mentess\u00e9g, amely az utas\u00edt\u00e1sok \u00f6sszead\u00e1s\u00e1t \u00e9s XOR m\u0171veletek v\u00e9grehajt\u00e1s\u00e1t biztos\u00edtja, valamint az AES-NI speci\u00e1lis utas\u00edt\u00e1sok eset\u00e9n sem biztos\u00edtott, \u00e9s m\u00e1s forr\u00e1sok szerint a vektorok szorz\u00e1sakor \u00e9s a bitek sz\u00e1mol\u00e1sakor egy ciklus k\u00e9sleltet\u00e9st okoz. <\/p>\n

Az Intel \u00e9s ARM v\u00e1llalatok a vizsg\u00e1lt viselked\u00e9s letilt\u00e1s\u00e1ra \u00faj z\u00e1szl\u00f3kat javasoltak: PSTATE DIT (Data Independent Timing) bit a CPU ARM sz\u00e1m\u00e1ra \u00e9s MSR DOITM (Data Operand Independent Timing Mode) bit a CPU Intel sz\u00e1m\u00e1ra, amelyek vissza\u00e1ll\u00edtj\u00e1k a r\u00e9gi viselked\u00e9st, amely \u00e1lland\u00f3 v\u00e9grehajt\u00e1si id\u0151t biztos\u00edt. Az Intel \u00e9s ARM v\u00e1llalatok azt aj\u00e1nlj\u00e1k, hogy sz\u00fcks\u00e9g eset\u00e9n aktiv\u00e1lj\u00e1k a v\u00e9delmet k\u00fcl\u00f6n\u00f6sen fontos k\u00f3d eset\u00e9n, de a val\u00f3s\u00e1gban fontos sz\u00e1m\u00edt\u00e1sok a kernel b\u00e1rmely r\u00e9sz\u00e9n \u00e9s a felhaszn\u00e1l\u00f3i t\u00e9rben el\u0151fordulhatnak, ez\u00e9rt a DOITM \u00e9s DIT m\u00f3dok folyamatos aktiv\u00e1l\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9t m\u00e9rlegelik az eg\u00e9sz kernel sz\u00e1m\u00e1ra. <\/p>\n

ARM processzorokhoz a Linux 6.2 kernel \u00e1gon m\u00e1r elfogadtak jav\u00edt\u00e1sokat, amelyek megv\u00e1ltoztatj\u00e1k a kernel viselked\u00e9s\u00e9t, de ezek a jav\u00edt\u00e1sok el\u00e9gtelennek sz\u00e1m\u00edtanak, mivel csak a kernel k\u00f3dj\u00e1ra vonatkoznak, \u00e9s nem v\u00e1ltoztatj\u00e1k meg a felhaszn\u00e1l\u00f3i t\u00e9r viselked\u00e9s\u00e9t. Intel processzorok eset\u00e9ben a v\u00e9delem aktiv\u00e1l\u00e1sa jelenleg csak ellen\u0151rz\u00e9s alatt \u00e1ll. A jav\u00edt\u00e1s teljes\u00edtm\u00e9nyre gyakorolt hat\u00e1s\u00e1nak m\u00e9r\u00e9se m\u00e9g nem t\u00f6rt\u00e9nt meg, de az Intel dokument\u00e1ci\u00f3ja szerint a DOITM m\u00f3d aktiv\u00e1l\u00e1sa cs\u00f6kkenti a teljes\u00edtm\u00e9nyt (p\u00e9ld\u00e1ul bizonyos optimaliz\u00e1ci\u00f3k, mint az adott adatokra vonatkoz\u00f3 el\u0151re bet\u00f6lt\u00e9s letilt\u00e1sa miatt), \u00e9s a j\u00f6v\u0151beli processzor modellek eset\u00e9ben a teljes\u00edtm\u00e9nycs\u00f6kken\u00e9s fokoz\u00f3dhat.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u042d\u0440\u0438\u043a \u0411\u0438\u0433\u0433\u0435\u0440\u0441 (Eric Biggers), \u043e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0448\u0438\u0444\u0440\u0430 Adiantum \u0438 \u043c\u044d\u0439\u043d\u0442\u0435\u0439\u043d\u0435\u0440 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u044f\u0434\u0440\u0430 Linux fscrypt, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0434\u043b\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e, \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0449\u0438\u0445 \u0438\u0437-\u0437\u0430 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 Intel, \u043d\u0435 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u0440\u0443\u044e\u0449\u0435\u0439 \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439 \u0434\u043b\u044f \u0440\u0430\u0437\u043d\u044b\u0445 \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445. \u0412 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 Intel \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0441\u0435\u043c\u0435\u0439\u0441\u0442\u0432\u0430 Ice Lake. \u0410\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u0435\u0442\u0441\u044f \u0438 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 ARM. […]<\/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-106545","post","type-post","status-publish","format-standard","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\udd47Az utas\u00edt\u00e1sok v\u00e9grehajt\u00e1si idej\u00e9nek f\u00fcgg\u0151s\u00e9ge az ARM \u00e9s Intel CPU adatait\u00f3l | ProHoster","description":"Eric Biggers, az Adiantum titkos\u00edt\u00f3 egyik fejleszt\u0151je \u00e9s a Linux fscrypt kernel alrendszer\u00e9nek karbantart\u00f3ja, egy jav\u00edt\u00e1ssort javasolt, hogy blokkolja a biztons\u00e1gi probl\u00e9m\u00e1kat, amelyek a processzorok saj\u00e1toss\u00e1g\u00e1b\u00f3l ad\u00f3dnak.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/zavisimost-vremeni-vypolneniya-instrukczij-ot-dannyh-na-cpu-arm-i-intel","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0417\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439 \u043e\u0442 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 CPU ARM \u0438 Intel | ProHoster","og:description":"\u042d\u0440\u0438\u043a \u0411\u0438\u0433\u0433\u0435\u0440\u0441 (Eric Biggers), \u043e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0448\u0438\u0444\u0440\u0430 Adiantum \u0438 \u043c\u044d\u0439\u043d\u0442\u0435\u0439\u043d\u0435\u0440 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u044f\u0434\u0440\u0430 Linux fscrypt, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0434\u043b\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e, \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0449\u0438\u0445 \u0438\u0437-\u0437\u0430 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/zavisimost-vremeni-vypolneniya-instrukczij-ot-dannyh-na-cpu-arm-i-intel","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-01-29T10:48:46+00:00","article:modified_time":"2023-02-07T10:09:03+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=106545"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/106545\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=106545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=106545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=106545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}