Intel CPU嚴重漏洞,修復後會降低約30%性能

572 回覆
99 Like 1 Dislike
2018-01-04 02:17:57
intel: 屌正!9700k唔洗擠咁多牙膏
2018-01-04 03:32:58
仲係高高在上先有資格講擠牙膏姐,依家咁樣此消彼長法, 就嚟要改口做intel發埋飲奶啲力都拋唔甩amd
2018-01-04 04:05:35
https://www.computerbase.de/2018-01/intel-cpu-pti-sicherheitsluecke/
Intel CPU中潛在的大規模漏洞目前引起轟動,這幾年安全研究人員發現了一種新的攻擊方式,它通過測量時序旁路的攻擊方式,精確分辨出記憶體的用戶空間和內核空間,進而攻擊內核,內核被突破以

反制的方法也不難,Linux在4.15版本預計發布KPTI防禦,又稱KAISER。另外Windows已經做出了完全相同原理的修改,在Build 17035上已經開啟。但會造成性能上的損失,普通情況下會損失約3-5%性能,極端情況下會損失30%~35%性能,例如NVME跑分就是極端情況的一種。

PTI影響到虛擬記憶體等核心功能,因此會帶來極大的性能損失:i7-6700【SkyLake-S】損失29%性能;i7-3770S【IvyBridge-S】損失34%性能。


即係呢幾年一直都知呢個問題?
NVME係咪M.2 SSD?
6代同3代Core CPU係重災區定只係個別型號?

用緊I7 6700HQ, Samsung M.2 NVMe ssd
2018-01-04 04:08:04
幾時執得,全世界都用緊intel,隨便一個Google告鳩佢都死得啦
2018-01-04 05:47:05
香港冇得Class action lawsuit 因為唔可以包攬訴訟
美帝國好多
2018-01-04 06:00:05
美帝國告得入既話
個個買左既都會有錢分
2018-01-04 08:37:47
LM
2018-01-04 08:40:52
你哋玩手機遊戲成日要用嚟多開嘅模擬器,咪就係vm
2018-01-04 08:59:30
intel 出statement想拉AMD ARM落水 .....
2018-01-04 09:04:15
求source
2018-01-04 09:07:15
2018-01-04 09:12:02
Intel statement:

https://newsroom.intel.com/news/intel-responds-to-security-research-findings/

The Verge 報導:

https://www.theverge.com/2018/1/3/16846840/intel-arm-processor-flaw-chipocalypse-windows-macos-linux

AMD話自己接近0風險
ARM話Cortex-A 都出事
2018-01-04 09:21:55
無知一問
本身呢幾日想砌機用8700
係咪可以唔使諗轉其他?
2018-01-04 09:23:59

2018-01-04 09:26:13
咪大把人狗衝
2018-01-04 09:31:32
Update, 10:56 PM - 1/2/18 - As it turns out, apparently the Linux patch that is being rolled out is for ALL x86 processors including AMD, and the Linux mainline kernel will treat AMD processors as insecure as well. As a result, AMD CPUs will feel a performance hit as well, though the bug only technically affects Intel CPUs and AMD recommends specifically not to enable the patch for Linux.

https://amp.hothardware.com/news/intel-cpu-bug-kernel-memory-isolation-linux-windows-macos

2018-01-04 09:37:13
Amd同intel角色調轉喇
2018-01-04 09:40:47
最好以後五五波
2018-01-04 09:43:51
返工唔打機好難過日辰
2018-01-04 09:51:01
打和啦 super!
2018-01-04 10:00:03
intel:
2018-01-04 10:07:43
Update, 10:56 PM - 1/2/18 - As it turns out, apparently the Linux patch that is being rolled out is for ALL x86 processors including AMD, and the Linux mainline kernel will treat AMD processors as insecure as well. As a result, AMD CPUs will feel a performance hit as well, though the bug only technically affects Intel CPUs and AMD recommends specifically not to enable the patch for Linux.

https://amp.hothardware.com/news/intel-cpu-bug-kernel-memory-isolation-linux-windows-macos

intel:

2018-01-04 10:13:09
tom's 有個comment

Intel's statement is an outright, purposeful deception. They brought up the spectre of data modification and completely avoided mentioning the actual bug, which is the ability to read the contents of kernel memory, when not a single person was talking about data modification and everyone was talking about the ability to read kernel memory. Being able to read kernel memory completely destroys the security of the machine, period. You don't NEED to be able to modify memory when you can steal the encryption keys!

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