{"id":4068,"date":"2018-06-23T05:49:36","date_gmt":"2018-06-23T05:49:36","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/openbsd-disables-intels-hyper-threading-over-cpu-data-leak-fears\/"},"modified":"2018-06-23T05:49:36","modified_gmt":"2018-06-23T05:49:36","slug":"openbsd-disables-intels-hyper-threading-over-cpu-data-leak-fears","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/openbsd-disables-intels-hyper-threading-over-cpu-data-leak-fears\/","title":{"rendered":"OpenBSD disables Intel\u2019s hyper-threading over CPU data leak fears"},"content":{"rendered":"
<\/div>\n

OpenBSD has disabled Intel\u2019s hyper-threading technology, citing security concerns \u2013 seemingly, Spectre-style<\/a> concerns.<\/p>\n

As detailed in this mailing list post<\/a>, OpenBSD maintainer Mark Kettenis wrote that \u201cSMT (Simultaneous Multi Threading) implementations typically share TLBs and L1 caches between threads.<\/p>\n

\u201cThis can make cache timing attacks a lot easier and we strongly suspect that this will make several Spectre-class bugs exploitable.\u201d<\/p>\n

So OpenBSD has decided to disable Intel CPU hyper-threading, with \u201ca new hw.smt sysctl<\/code>,\u201d in order to avoid data potentially leaking from applications to other software via Spectre-like processor flaws.<\/p>\n

\u201cFor now this only works on Intel CPUs when running OpenBSD\/amd64,\u201d Kettenis wrote. \u201cBut we’re planning to extend this feature to CPUs from other vendors and other hardware architectures.\u201d<\/p>\n

Insane in the domain<\/span><\/h3>\n

There\u2019s not much more by way of explanation for the decision in Kettenis\u2019 post, other than the observation that: \u201cWe really should not run different security domains on different processor threads of the same core.\u201d<\/p>\n

There is, however, a further hint about the reason in this post<\/a> from OpenBSD chap Philip Guenther, who committed a change to \u201cclear the GPRs when entering the kernel from userspace so that user-controlled values can’t take part in speculative execution in the kernel down paths that end up ‘not taken’ but that may cause user-visible effects (cache, etc).\u201d<\/p>\n

That commit was accompanied by a request to disable Intel hyper-threading.<\/p>\n

We’ve also spotted this Seclists message<\/a> mentioning OpenBSD’s decision, and hinting a related disclosure coming on June 27. And this talk<\/a> at Black Hat in August that promises to reveal how miscreants can extract encryption keys from application memory via hyper-threading and TLB data leaks.<\/p>\n

Specifically, that presentation, by Ben Gras, will cover a technique dubbed TLBleed that exploits hyper-threading to swipe sensitive data:<\/p>\n

We\u2019ve asked Kettenis to offer more information, and Intel to comment, but neither had been in touch at the time of writing.<\/p>\n

Performance<\/span><\/h3>\n

Kettenis\u2019 post suggest disabling hyper-threading won\u2019t be a big deal because \u201cSMT doesn’t necessarily have a positive effect on performance; it highly depends on the workload. In all likelihood it will actually slow down most workloads if you have a CPU with more than two cores.\u201d<\/p>\n

He\u2019s not wrong: unless code is written with hyper-threading in mind, the performance benefit isn\u2019t enormous, and not a lot of code specifically takes advantage of the feature. Hyper-treading works by allowing one CPU core to run multiple threads at once, as opposed to one thread per core.<\/p>\n

Intel, however, markets hyper-threading as a distinct virtue: its CPU spec sheets<\/a> always mention core and thread count.<\/p>\n

Hints of further Spectre-like security worries will therefore be most unwelcome to Chipzilla. The OpenBSD community was miffed by the steps taken to disclose Meltdown and Spectre design flaws \u2013 effectively freezing out<\/a> a chunk of the BSD world from private collaborations on mitigations \u2013 and called for such revelations to be handled differently in future. \u00ae<\/p>\n

Sponsored:<\/span> Minds Mastering Machines – Call for papers now open<\/a><\/p>\n

READ MORE HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Cites risk of different security domains on one core as others hint at another bug drop OpenBSD has disabled Intel\u2019s hyper-threading technology, citing security concerns \u2013 seemingly, Spectre-style concerns.\u2026 READ MORE HERE…<\/p>\n","protected":false},"author":2,"featured_media":4069,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-4068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-register"],"yoast_head":"\nOpenBSD disables Intel\u2019s hyper-threading over CPU data leak fears 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security & Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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