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Meltdown & Spectre Information and Discussion

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Re: Meltdown & Spectre Information and Discussion
« Reply #45 on: January 15, 2018, 03:58:51 AM »
 

newtusmaximus

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Re: Meltdown & Spectre Information and Discussion
« Reply #46 on: January 15, 2018, 05:25:10 PM »
 

trinidad

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Nasty little side effects. With the meltdown mitigations on both kernels .109 in Ubuntu LTS base system, and .110 in LL running in Qemu I'm running a right around a 38% increase in RAM usage with heavy IO (noted while updating from .109 to .110 in LL running in Qemu) CPU bouncing between 70% and 90%. RAM usage never exceeded 50% before.

Settled back a bit after rebooting both. Only about 15% higher that before running Firefox in both systems simultaneously.

TC
Last Edit: January 15, 2018, 05:39:56 PM by trinidad
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #47 on: January 16, 2018, 12:02:46 AM »
 

Jerry

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Re: Meltdown & Spectre Information and Discussion
« Reply #48 on: January 16, 2018, 09:47:18 AM »
 

trinidad

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I've read them both before Jerry. Glad Distrowatch has made the info easy to access. Spectre is a threat to high end propietary security meaures like AV and anti-malware deployments that use CPU sandboxing, and is also able to produce DOS exploits via bit flipping exploits akin to the rowhammer concept. Every existing CPU protection/monitoring gadget is open to exploit this way. It is the ultimate back door. I am avoiding being technical until I'm ready with my own conclusions.

TC 
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #49 on: January 16, 2018, 11:00:01 AM »
 

newtusmaximus

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https://community.sophos.com/kb/en-us/128053 -  Its relevance to LL or  Debian distros is beyond me I am afraid.  May be of help to our "knowledgeable ones" though
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Re: Meltdown & Spectre Information and Discussion
« Reply #50 on: January 16, 2018, 11:51:03 AM »
 

trinidad

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I've tested the Meltdown Spectre checker from github and the Ubuntu commands on this page and they work.

https://www.ostechnix.com/check-meltdown-spectre-vulnerabilities-patch-linux/

TC

Last Edit: January 16, 2018, 12:17:51 PM by trinidad
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #51 on: January 16, 2018, 05:00:56 PM »
 

trinidad

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This whole post was wrong. I've wortked on 38 different machines in the last four days and my head is is tired and my laptop notes completely jumbled. So far I can say that the meltdown mitigation (KPTI) has yet to roll out for LTS 32bit, and the spectre v1 mitigation has yet to roll out for Ubuntu LTS 64bit though it is in place in LL 32bit. Some 32bit machines I have tested have 800 code ops in place for Specter v1. I expect this number is excessive for big 64bit systems thus the delay. So generally : 32bit is safe from specter v1 so far, and 64bit has KPTI mitigation. Sorry for the previous error. I'm stopping for today now.   

TC
Last Edit: January 16, 2018, 06:13:30 PM by trinidad
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #52 on: January 16, 2018, 09:14:04 PM »
 

TheDead

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@trinidad - I also concur that the Distrowatch article is one of the easiest on the brain! ;)
Also, I must say trinidad that you are quite the "machine" on this technical subject! ;) again.

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Re: Meltdown & Spectre Information and Discussion
« Reply #53 on: January 16, 2018, 11:33:45 PM »
 

Jerry

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Even easier script. Download - https://github.com/linuxlite/Spectre-Meltdown-Checker-Automated
Extract and double click on sm-start to run the checker. Let me know how this goes.

Last Edit: January 17, 2018, 02:17:51 AM by Jerry
 

Re: Meltdown & Spectre Information and Discussion
« Reply #54 on: January 17, 2018, 08:36:23 AM »
 

bfb

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I have this with kernel 4.10 (Lite)
Should I go back to Kernel 4.4.0?

 

Re: Meltdown & Spectre Information and Discussion
« Reply #55 on: January 17, 2018, 08:45:43 AM »
 

trinidad

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4.4 LTS has KPTI rev -109 and above. LL is on rev -111 now.

TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #56 on: January 17, 2018, 08:52:12 AM »
 

trinidad

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News: Write to the congressman.

https://imgur.com/a/4IoTC

TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #57 on: January 17, 2018, 09:14:08 AM »
 

trinidad

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If you want to know how technically bad this is going to get follow this guy.

https://twitter.com/aionescu

TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #58 on: January 17, 2018, 09:26:48 AM »
 

trinidad

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This is where the fun begins.

https://arstechnica.com/gadgets/2018/01/spectre-and-meltdown-patches-causing-trouble-as-realistic-attacks-get-closer/

For MS ... " If you are using VMware ESXi to update your microcode, VMware says you should revert to an earlier version."

TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.
 

Re: Meltdown & Spectre Information and Discussion
« Reply #59 on: January 17, 2018, 10:40:27 AM »
 

newtusmaximus

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Just after latest update.  Beforehand vulnerable throughout.  So some improvement.
Great tool Jerry !!
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2007 - Fujitsu Siemens V3405 Laptop  2 GB Ram LL3.6 32bit. Now 32bit Debian 9 + nonfree.
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