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我隻貓叫貓貓 31日
https://www.tomshardware.com/news/intel-disable-hyper-threading-spectre-attack,39333.html

Intel’s New Spectre-Like Flaw Affects Chips Made Since 2008
by Lucian Armasu May 14, 2019 at 10:06 AM

36 Comments

Update, 5/14/19, 1:47pm PT: Added multiple items, posted underneath update note below:

Intel clarified that it's not recommending everyone to disable Hyper-Threading, but that some of its customers should consider the option depending on their security needs:

"Once these updates are applied, it may be appropriate for some customers to consider additional steps. This includes customers who cannot guarantee that trusted software is running on their system(s) and are using Simultaneous Multi-Threading (SMT). In these cases, customers should consider how they utilize SMT for their particular workload(s), guidance from their OS and VMM software providers, and the security threat model for their particular environment. Because these factors will vary considerably by customer, Intel is not recommending that Intel HT be disabled, and it’s important to understand that doing so does not alone provide protection against MDS."

Google seems to be one of those select customers which considers the risk of keeping HT enabled just too big. The company has published on the Chromium site that HT will be disabled in Chrome OS version 74:

"To protect users, Chrome OS 74 disables Hyper-Threading by default. For the majority of our users, whose workflows are primarily interactive, this mitigates the security risk of MDS without a noticeable loss of responsiveness. Chrome OS 75 will contain additional mitigations."
我隻貓叫貓貓 31日
Intel新安全漏洞,籲用家關Hyper Threading :o)


Affected Processors

Virtually all of Intel’s chips starting with the Nehalem architecture (launched in 2008, 11 years ago) and newer, with the exception of the Whiskey Lake (ULT refresh), Whiskey Lake (desktop), as well as the Atom and Knights architectures, are affected by the MDS vulnerabilities.

What this tell us is not only that there are now multiple speculative execution attacks against Intel’s processors, or that there will be more to come until a Intel applies a more significant overhaul to its architecture, but that most of these chips will likely never be patched against this flaw and others like it. Motherboard and laptop OEMs tend to update only their most recent products, so the majority of systems sold in the past 11 years will likely remain vulnerable.

Those that do get the patches shouldn’t necessarily consider themselves that much luckier either, as the performance loss after the patches are applied could be significant. Those who buy the new Intel chips starting with Whiskey Lake refresh and later should see a much lower performance loss as well as the security protection from the built-in hardware mitigations, at least until a new speculative execution attack appears that can bypass the new mitigation appears.

Intel has provided more information about the MDS flaws, including about how to get the software patches, on its website.
我隻貓叫貓貓 31日
Chrome OS default會關閉Hyper Threading

所有用Nehalem architecture 既CPU都受影響
追溯至2008年[sosad]

INTEL用家真係爽,比貴咁多,又咁多野玩#yup#
花生史諾比 31日
高登仔成日叫人出i7, 我買 i5, 想disable HT都唔得 :-(
型爆搖滾風聯乘背囊
Eastpak x Raf Simons Poster Backpack 五三折 HK$784!
www.ssense.com
贊助網站
點解又係你? 31日
高登仔成日叫人出i7, 我買 i5, 想disable HT都唔得 :-(

notebook i5 u 咪有ht:o)
我隻貓叫貓貓 31日
高登仔成日叫人出i7, 我買 i5, 想disable HT都唔得 :-(

notebook i5 u 咪有ht:o)


INTEL為你地好
而家買貴CPU就叫你唔好開HT
向左走向右走狗咁向左走向右走[sosad]
點解又係你? 31日

notebook i5 u 咪有ht:o)


INTEL為你地好
而家買貴CPU就叫你唔好開HT
向左走向右走狗咁向左走向右走[sosad]

而家咪叫緊4-8代i7苦主升9700k囉

9700k冇ht[slick] [slick] [slick]
*做乜姐你* 31日
之前成日BSOD,後尾關係左Hyper Threading,好似少左BSOD好多,唔知關唔關事?
P.拿姆 31日
真係痴向左走向右走線.....
無名無影 30日
牙膏廠識玩#yup#
我隻貓叫貓貓 30日
新patch出左
最多會影響40%效能[sosad] [sosad] [sosad] [sosad]
豬腸頭阿含 30日
新patch出左
最多會影響40%效能[sosad] [sosad] [sosad] [sosad]

40 [sosad] [sosad]
我討厭麻煩 30日
新patch出左
最多會影響40%效能[sosad] [sosad] [sosad] [sosad]

intel fan屎回應下
我隻貓叫貓貓 30日
Intel 在其白皮書中承認軟件緩解將對 Hyper Threading 的工作方式產生重大影響,線程之間需要更高級別的隔離,並且它們將無法再運行來自不同安全域的進程,來自不同安全域的線程將變得空閒,從而變成浪費的處理能力。

發現 ZombieLoad 的研究人員聲稱 ,由於 ZombieLoad 在邏輯核心上洩漏了加載值,因此直接緩解就是禁止使用 Hyper Threading,Hyper Threading 將某些工作負載的性能提高了 30% 到 40%。

#bye#
花生史諾比 30日
Apple: Protecting Macs from MDS Vulnerabilities May Reduce Performance by up to 40%
https://www.techpowerup.com/255585/apple-protecting-macs-from-mds-vulnerabilities-may-reduce-performance-by-up-to-40
星期一 29日
[yipes]
香江19 28日
傻仔繼續用Intel,唔好同我爭AMD#yup#
KTST 28日
標題話不用AMD,但INTEL又有漏洞,想點[sosad]
朋友的賬號 28日
好彩我電腦用AMD

不過我部laptop 係用Intel i7
點算?係咪要關左Hyper Threading? (唔識點關)
朋友的賬號 27日
好彩我電腦用AMD

不過我部laptop 係用Intel i7
點算?係咪要關左Hyper Threading? (唔識點關)

https://www.pcmag.com/article/314585/how-to-disable-hyperthreading
我隻貓叫貓貓 27日
標題話不用AMD,但INTEL又有漏洞,想點[sosad]


有班人話AMD有bugs就永不錄用
intel 有bugs就扮盲Z_Z
武春黛 27日
"Intel幾穩定"
朋友的賬號 26日
標題話不用AMD,但INTEL又有漏洞,想點[sosad]


有班人話AMD有bugs就永不錄用
intel 有bugs就扮盲Z_Z

AMD有咩bug?
誠公需撫鋼 26日


有班人話AMD有bugs就永不錄用
intel 有bugs就扮盲Z_Z

AMD有咩bug?

spectre,不過好多行暖序嘅CPU都瀨嘢(同期仲有ARM A73為基礎既U0
收信 26日
換左粒9400f幾日
上網睇無hyper threading
係咪即係所有coffee lake既u都無事[???]
誠公需撫鋼 26日
換左粒9400f幾日
上網睇無hyper threading
係咪即係所有coffee lake既u都無事[???]

No
Meltdown debug 咗
但今次嘅zombieload係到9代都未debug
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