Category Archives: OS

Operating System – UNIX/Linux, Solaris

Ubuntu Kernel Build Again

I wrote two blog posts about Linux kernel build on Ubuntu [1,2]. There is also an official wiki page talking about the same thing [3]. Still, things are broken when I try to create a homework assignment for my class. … Continue reading

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Syscall hijacking in 2019

Whether you need to implement a kernel rootkit or inspect syscalls for intrusion detection, in a lot of cases, you might need to hijack syscall in a kernel module. This post summorizes detailed procedures and provides a working example for … Continue reading

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Kernel build on Nvidia Jetson TX1

This post introduces native Linux kernel built on the Nvidia Jetson TX1 dev board. The scripts are based on the jetsonhacks/buildJetsonTX1Kernel tools. Our target is JetPack 3.3 (the latest SDK supporting TX1 by the time of writing). All the scripts … Continue reading

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Kernel Code Execution Time Measurement (kcetm)

This post mainly talks about the correct usage of tsc counters provided by Intel x86/x86-64 architectures to measure the Linux kernel code execution time. Most of the content here is borrowed/inspired from [1]. Note that this is NOT a post … Continue reading

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Rowhammer Pine64

Rowhammer attacks have been well known, and gotten a lot of publications already. However, we notice that most rowhammers happened on x86 architecture due to the easy access to clflush from the user space. ARM architecture (both ARMv7 and ARMv8) … Continue reading

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Running Multics on Linux (Fedora 27)

This post follows the “Multics Simulator Instructions”[1] (with some tweaks) to setup Multics simulator dps8m and run Multics on my Fedora 27. Other Linux distro (Ubuntu/Debian/Raspbian) may need some changes but basically work the same way. Experience the cutting-edge secure … Continue reading

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USB gadget functionalities in Android

I started working on Android stuffs this summer. While I mainly work on the USB layer within the Linux kernel, I do sometimes need to look into the Android framework, to see if I could achieve my goal from the … Continue reading

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