Tag Archives: kernel

Ubuntu Kernel Build Again

Posted on November 7, 2019 by daveti

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 →

Posted in IDE_Make, Linux Distro, OS | Tagged , , , , , , , , , , , , | 1 Comment

USB Fuzzing: A USB Perspective

Posted on July 17, 2019 by daveti

Syzkaller [1] starts to support USB fuzzing recently and has already found over 80 bugs within the Linux kernel [2]. Almost every fuzzing expert whom I talked to has started to apply their fuzzing techniques to USB because of the … Continue reading →

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Syscall hijacking in 2019

Posted on February 25, 2019 by daveti

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 →

Posted in OS, Security | Tagged , , , , | 1 Comment

Kernel build on Nvidia Jetson TX1

Posted on December 31, 2018 by daveti

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)

Posted on May 20, 2018 by daveti

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 →

Posted in Dave's Tools, OS, Programming | Tagged , , , , , , , , | 1 Comment

“make deb-pkg” broken

Posted on March 15, 2018 by daveti

Last time when I hacked the Linux kernel on Ubuntu, it was 4.4 on LTS 14.04. Time flies. Now I need to hack the kernel 4.13 again on LTS 16.04, and find the kernel build broken. It is fine that … Continue reading →

Posted in Linux Distro | Tagged , , | 1 Comment

getdelays – get delay accounting information from the kernel

Posted on September 6, 2016 by daveti

Top may be the most common tool in use whenever a preformance issue is hit. It is simple, quick and dumb. Besides the heavy metal stuffs like perf and gprof, another really useful and simple tool is getdelays, which provides … Continue reading →

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Making USB Great Again with USBFILTER – a USB layer firewall in the Linux kernel

Posted on August 4, 2016 by daveti

Our paper “Making USB Great Again with USBFILTER” has been accepted by USENIX Security’16. This post provides a summary of usbfilter. For details, please read the damn paper or download the presentation video/slides from USENIX website. I will head to … Continue reading →

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gcc, llvm, and Linux kernel

Posted on March 12, 2016 by daveti

This post talks about what happened recently in the Linux kernel mailing list discussion. While this post does not dig into compiler internals or the whole picture between the Linux kernel and compilers, we discuss 2 specific issues from gcc … Continue reading →

Posted in OS, Stuff about Compiler | Tagged , , , , | Leave a comment

Defending Against Malicious USB Firmware with GoodUSB

Posted on December 3, 2015 by daveti

Finally, 4 months after our paper was accepted by ACSAC’15, I could now write a blog talking about our work – GoodUSB, and release the code, due to some software patent bul*sh*t. (I sincerely think software patent should be abolished … Continue reading →

Posted in OS, Security | Tagged , , , , , , , | 2 Comments