SUSE Blog

Tag: kGraft

Nicolai Stange
By: Nicolai Stange

May 7, 2018 1:54 pm

3,170 views

Live Patching Meltdown – SUSE Engineer’s research project (Part 4 – The Conclusion)

Now that everything has been set to go as described in Part 1 (Key technical obstacles for Live Patching Meltdown), Part 2 (Virtual address mappings and the Meltdown vulnerability)  and Part 3 (Changes needed for Translation Lookaside Buffer (TLB) flushing primitives), the last missing piece is to actually replace the entry code and make it […]

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Categories: SUSE Linux Enterprise Live Patching

Nicolai Stange
By: Nicolai Stange

May 4, 2018 12:20 pm

3,279 views

Live Patching Meltdown – SUSE Engineer’s research project (Part 3)

Building upon the Part 1 (Key technical obstacles for Live Patching Meltdown) and the Part 2 (Virtual address mappings and the Meltdown vulnerability), let's now address the needed changes to the TLB flushing primitives. In order to resolve virtual to physical addresses, a CPU must traverse the page table tree. This is a costly […]

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Categories: SUSE Linux Enterprise Live Patching

Nicolai Stange
By: Nicolai Stange

May 3, 2018 11:59 am

3,456 views

Live Patching Meltdown – SUSE Engineer’s research project (Part 2)

Following up on the Part 1 about key technical obstacles for Live Patching Meltdown, in this blog I will give you some background on virtual address mappings in context of the Meltdown vulnerability and look at patching kGraft itself! Virtually mapped memory is a protection feature provided by the CPU, orthogonal to the privilege separation […]

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Categories: SUSE Linux Enterprise Live Patching

Nicolai Stange
By: Nicolai Stange

May 2, 2018 2:37 pm

6,015 views

Live Patching Meltdown – SUSE Engineer’s research project (Part 1)

Meltdown is one of the biggest and complex security vulnerabilities that happened recently and impacted almost everyone. I am a SUSE live patching engineer and wanted to share with you how unique fixing this vulnerability was in terms of scope and complexity. My goal was to see if I could also create a live patch […]

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Categories: SUSE Linux Enterprise Live Patching


By: Vojtěch Pavlík

August 12, 2015 11:22 am

9,523 views

Reboot Reloaded: Patching the Linux Kernel Online

"This article is from The SUSE Insider, a technical quarterly publication for SUSE customers to help them get the most value from their SUSE solutions." Author: Vojtech Pavlik is director of SUSE Labs, a department within SUSE R&D focusing on core technologies and research. He is one of the creators of […]

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Categories: Technical Solutions


By: George Shi

November 18, 2014 3:26 pm

5,102 views

SUSE Linux Enterprise Live Patching is launched!

It’s always be fun at SUSECon.  And this year at SUSECon, we’re happy to announce a long-anticipated new offering: SUSE Linux Enterprise Live Patching. This offering is based on the kGraft project -- and can perform critical kernel patches without rebooting your server, maximizing your up-time and service availability.  Now you […]

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Categories: Announcements, Expert Views


By: ssalgy

March 28, 2014 10:55 am

3,831 views

Slideshow: Live Kernel Patching with kGraft

Check out this slideshow about live patching of the Linux kernel using kGraft.  Vojtech Pavlik, the Director of SUSE labs, lays out some important info such as: Why live patching is so much better than rebooting -- especially for mission-critical servers How kGraft works Limitations of kGraft He also includes excellent details about: Exactly […]

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Categories: SUSE Linux Enterprise Server


By: ssalgy

March 28, 2014 10:35 am

8,772 views

kGraft Live Kernel Patching now available for download

SUSE has released kGraft to the public, the technology it developed to deliver live, run-time patching of the Linux kernel. Unlike other technologies, kGraft doesn't require stopping the kernel even for short periods, making it easier for IT staff to install critical security and other patches without system downtime. "Originally a research project from […]

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Categories: SUSE Linux Enterprise Server, Technical Solutions


By: Bryan Lunduke

February 16, 2014 12:28 pm

4,042 views

Video demo: Live Linux Kernel Patching with kGraft

In the 2 weeks since we announced the existence of kGraft, there have been many questions about how this solution for live-patching the Linux kernel works. And because (moving) pictures often speak louder than words, here is a video of kGraft in action on the official SUSE YouTube channel.[…]

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Categories: Expert Views

Matthias G. Eckermann
By: Matthias G. Eckermann

February 7, 2014 7:59 am

7,427 views

Do We Need "kGraft" at All?

Editor's Note:  kGraft is now available for download. Vojtěch's announcement about kGraft started a number of interesting discussions, e.g. at LWN, Reddit, and German Heise. All of those discussions have some common topics. One of these is the question whether a live kernel patching solution such as kGraft is necessary at all. Some typical […]

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