{"id":84985,"date":"2020-06-12T13:42:15","date_gmt":"2020-06-12T11:42:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya"},"modified":"2020-06-12T13:42:15","modified_gmt":"2020-06-12T11:42:15","slug":"arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","title":{"rendered":"ARM oli haavatav: avastati eriline haavatavus spekulatiivsete arvutuste r\u00fcnnakute vastu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Laialdase arhitektuuriga Armv8-A (Cortex-A) protsessorite jaoks leiti<\/a><\/noindex> oma ainulaadne haavatavus k\u00fclgsuunalise r\u00fcndamise jaoks spekulatiivsete arvutusalgoritmide kasutamisega. Sellest teatas ARM ise ja jagas parandusi ning juhiseid leitud haavatavuse leevendamiseks. Oht pole suur, kuid sellega ei saa teha kergek\u00e4eliselt, kuna ARM arhitektuuriga protsessoreid on igal pool, mis teeb lekete riski tagaj\u00e4rjed ettekuulutamatuks.<\/p>\n

\"ARM<\/p>\n

Google'i spetsialistide avastatud haavatavus ARM arhitektuurides sai koodnimetuse Straight-Line Speculation (SLS) ja ametliku t\u00e4hise CVE-2020-13844. ARM'i s\u00f5nul on SLS haavatavus \u00fcks Spectre haavatavuse vorme, mille kohta (koos Meltdown'i haavatavusega) sai laialdaselt teada jaanuaris 2018. Teisis\u00f5nu, see on klassikaline haavatavus spekulatiivsete arvutuste mehhanismides k\u00fclgsuunaliste (k\u00fclg) r\u00fcnnakute jaoks.<\/p>\n

Spekulatiivsed arvutused n\u00f5uavad andmete eelnevat t\u00f6\u00f6tlemist mitme v\u00f5imaliku haru kaudu, kuigi hiljem v\u00f5ivad need osutuda mittevajalikeks. K\u00fclgsuunalised r\u00fcnnakud v\u00f5imaldavad varastada selliseid vaheandmeid enne nende t\u00e4ielikku h\u00e4vitamist. Tulemuseks on produktiivsed protsessorid ja andmete leke.<\/p>\n

Straight-Line Speculation r\u00fcnnak ARM arhitektuuriga protsessoritele sunnib protsessorit iga kord, kui k\u00e4su voogu muudetakse, minema t\u00e4itma otse m\u00e4lu leidunud k\u00e4ske, selle asemel, et j\u00e4rgida uusi k\u00e4suu voogu. Ilmselgelt pole see parim valik k\u00e4sude t\u00e4itmiseks, mida r\u00fcndaja v\u00f5ib \u00e4ra kasutada.<\/p>\n

<\/center><\/p>\n

ARM'i kiituseks, et nad ei ainult avaldanud arendajatele m\u00f5eldud juhiseid, mis aitavad v\u00e4ltida leke riski Straight-Line Speculation r\u00fcnnaku kaudu, vaid pakkusid ka parandusi peamistele operatsioonis\u00fcsteemidele, nagu FreeBSD, OpenBSD, Trusted Firmware-A ja OP-TEE ning avaldasid parandusi GCC ja LLVM kompilaatoritele.<\/p>\n

Samuti teatas ettev\u00f5te, et paranduste rakendamine ei m\u00f5juta ARM platvormide j\u00f5udlust, nagu see juhtus Intel'i x86 \u00fchilduvate platvormidega, kui Spectre ja Meltdown haavatavused blokeeriti. Kuid sellest saame teada kolmandate allikate kaudu, mis annab objektiivse pildi uuest haavatavusest.<\/p>\n

<\/p>\n

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Allikas: 3dnews.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0443\u0442\u0435\u0447\u0435\u043a […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":84986,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-84985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47ARM on lekkinud: avastatud on eriline haavatavus spekulatiivsete arvutuste r\u00fcndamiseks | ProHoster","description":"Laialdase arhitektuuriga Armv8-A (Cortex-A) protsessorite 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