Elivepatch Flexible distributed Linux Kernel live patching. Alice Ferrazzi
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1 Elivepatch Flexible distributed Linux Kernel live patching Alice Ferrazzi 1
2 Summary Live patch explanation Current live patch services Motivation for elivepatch Elivepatch solution Implementation Challenge Status Future Work Conclusion 2
3 kernel :~ $ whoami Gentoo Gentoo Kernel Project Leader Gentoo Kernel Security Gentoo board member Gentoo Google Summer of Code administrator and mentor for rust Gentoo project Cybertrust Japan OSS Embedded Software Engineer Researcher ACM SIGOPS member Presented elivepatch as poster at SOSP
4 This project was part of Google Summer of Code 2017 for the Gentoo organization. 4
5 Live patch explanation 5
6 Live patch Modify the kernel without the need to reboot. 6
7 Why - Downtime is expensive (containers, supercomputers) - Security (vulnerability time shorter) 7
8 Where - Embedded - Mobile - Desktops - HPC (complex scientific computations) - Cloud - Any computer under heavy load 8
9 What 9
10 Kgraft Suse Open Source live patching system that is routing the old function gradually. 10
11 Kpatch Red Hat Open Source live patching system and use ftrace and stop_machine() for route functions toward the new function version. 11
12 Livepatch Livepatch is a hybrid of kpatch and kgraft. Livepatch has been merged into the kernel upstream. Kpatch-build can work with both kpatch and livepatch for creating the live patch. 12
13 Livepatch is just a module 13
14 ... 14
15 Livepatch module problem A module that takes just about 1+ hour to compile in a modern server 15
16 At Gentoo, we know what means to compile something for more than 1 hour 16
17 17
18 Gentoo solution to compile for 1+ hour compilation problem Gentoo binary host Pre-compiled binary 18
19 What options do we have for compiling livepatch modules? 19
20 Current existing livepatch services 20
21 Current vendor solutions Oracle, Ksplice (support only Oracle Linux kernels) Suse Linux Enterprise Live Patching (support only Suse Kernels for one year) Canonical Live Patch (support only Ubuntu LTS and Ubuntu LTS) Red Hat live patch (Support only Red Hat kernel) 21
22 Motivation for elivepatch 22
23 Problems of vendor solutions trusting on third-party vendors Lacking support for custom kernel configurations Lacking support for request-driven costumization Lacking long term support Closed source 23
24 elivepatch solution 24
25 elivepatch A web service framework to deliver Linux kernel live patches Supports custom kernel configurations User participation via request-driven customization Open source 25
26 Vendor solutions representation 26
27 Elivepatch solution 27
28 Implementation 28
29 Elivepatch-server (Main language: Python) Flask + Flask-Restful + Werkzeug (not dependent) Elivepatch-client (Main language: Python) Requests + GitPython 29
30 Challenges 30
31 Challenges with elivepatch Some patches require manual modification to converted to live patches Reproducing the build environment can be difficult: Differences in compiler versions Variations in the compiler and optimization flags Incompatible machine architectures (solaris, hpc) 31
32 Incompatibility with GCC CCFLAGS and non vanilla gcc, can sometime broke elivepatch. 32
33 Current status 33
34 Elivepatch status First open source release 0.1 on 2017/9/06 Packaged for Gentoo Presented as poster at SOSP 2017 Close collaboration with kpatch mainteiners 34
35 Future work 35
36 Future work Automate livepatch conversion Increasing scalability using containers and virtual machines Livepatch signing Kernel CI\CD check 36
37 Automate livepatch conversion - Check patch for problems during conversion - Suggest changes to patch for conversion - Interest also for upstream to kpatch 37
38 Multi distribution Solve distributions compatibility issues Current target: Debian Fedora Gentoo Android 38
39 Elivepatch client on Debian Work in progress p.s. Gentoo kernel is still needed 39
40 Livepatch signing Implementing livepatch module signing in the server Implementing signing verification for the client 40
41 Kernel CI/CD checking Implement a buildbot plugin for testing elivepatch [You can test your livepatch with the same settings and hardware as where you want to deploy it] 41
42 Conclusion 42
43 Epilogue Live patch is a module that takes time compiling Live patch vendor service solutions solving the compilation problem Elivepatch solution 43
44 Conclusion With the diffusion of embedded systems and robotics, Livepatch services will become always more important 44
45 If you are interested in contributing, Elivepatch is welcoming every form of contributions 45
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