On 05/01/18 17:40, shirish शिरीष wrote: > addition at bottom :- > > On 05/01/2018, shirish शिरीष <shirisha...@gmail.com> wrote: >> Dear all, >> >> While I don't want to be the paranoid one here, the situation here >> seems to demand it. >> >> 3 Days back the Register broke the story of a chip vulnerability - >> >> https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/ >> >> While it seeked to paint only Intel, it is now learnt that the issue >> is across the board, i.e. Intel, AMD, ARM all have the same >> vulnerability >> >> It defeats or compromises KASLR which itself is just 4 years old >> technology. >> >> AFAIK it would need two solutions, one is the appropriate microcode >> for your chip architecture, I know Intel and AMD have the respective >> intel-microcode and amd64-microcode >> >> % aptitude search microcode >> p amd64-microcode >> - Processor microcode firmware for AMD CPUs >> i intel-microcode >> - Processor microcode firmware for Intel CPUs >> p microcode.ctl >> - Intel IA32/IA64 CPU Microcode Utility (transitional >> package) >> >> % apt-cache policy intel-microcode >> intel-microcode: >> Installed: 3.20171215.1 >> Candidate: 3.20171215.1 >> Version table: >> *** 3.20171215.1 100 >> 1 http://httpredir.debian.org/debian unstable/non-free amd64 >> Packages >> 100 /var/lib/dpkg/status >> 3.20171117.1 900 >> 900 http://httpredir.debian.org/debian buster/non-free amd64 >> Packages >> >> >> According to Henrique it would take another week to have the whole >> thing on the microcode side of the things - >> >> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886367 >> >> On top of that you would need a newer kernel which mitigates some more >> of the effects. >> >> Techcrunch did a detailed blog post on the subject alongwith some idea >> of the timeline >> >> https://techcrunch.com/2018/01/03/kernel-panic-what-are-meltdown-and-spectre-the-bugs-affecting-nearly-every-computer-and-device/ >> >> The only good thing is that it doesn't increase any remote attack >> vector than before but it does mean that people should be more >> circumspect about any software they download at least till the next >> couple of weeks when kernel updates and cpu-microcodes should take >> some of the steam off. >> >> The bad news is that it will take some of the performance of the table >> but that is to be expected. >> >> An interesting side-story which has developed also talks about the >> current Intel CEO's doings >> >> https://techcrunch.com/2018/01/04/after-meltdown-and-spectre-revelation-questions-arise-about-timing-of-intel-ceos-stock-sales/ >> >> Hope everybody does the right thing, get the latest microcodes and >> update your kernel as fast as you can. >> >> -- >> Regards, >> Shirish Agarwal शिरीष अग्रवाल >> My quotes in this email licensed under CC 3.0 >> http://creativecommons.org/licenses/by-nc/3.0/ >> http://flossexperiences.wordpress.com >> EB80 462B 08E1 A0DE A73A 2C2F 9F3D C7A4 E1C4 D2D8 >> Nice post!
The retpoline approach suggested yesterday looks like it provides a better approach wrt performance so may be worth waiting: https://www.phoronix.com/scan.php?page=news_item&px=Linux-Kernel-Retpoline-Patches _______________________________________________ plug-mail mailing list plug-mail@plug.org.in http://list.plug.org.in/listinfo/plug-mail
