Author Archives: daveti

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About daveti

Interested in kernel hacking, compilers, machine learning and guitars.

Bye Eugene and Hi Gainesville – Yet another new start in life

Posted on December 14, 2014 by daveti

I came across with the picture below and I decided to use it for this post, with the proud of being a DUCK. FYI, except this picture, this post is NOT related with any technologies or football. Save your time … Continue reading →

Posted in Life Prose | Tagged , | Leave a comment

Python Internals – Integer object pool (PyIntObject)

Posted on December 11, 2014 by daveti

Starting from this post, I will try to make a series of blogs on Python Internals, where Python object mechanism, Python bytecode (pyc) and Python VM are gonna be discussed. We will also talk about the limited resource online about … Continue reading →

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

Python Hacking – urlopen timeout issue

Posted on November 14, 2014 by daveti

Recent playing with Python urllib2 reveals an interesting fact that the timeout parameter of urlopen() does not work sometimes. The interesting issue has successfully pushed me deep into the Python source code for debugging. The final debugging, without surprise, shows … Continue reading →

Posted in Programming, Stuff about Compiler | Tagged , , , , , , | 5 Comments

CCS’14 – Securing SSL Certificate Verification through Dynamic Linking

Posted on November 6, 2014 by daveti

Our paper ‘Securing SSL Certificate Verification through Dynamic Linking‘ is ready for download from CCS’14. This post gives a brief introduction of main idea of this paper – certShim, and then concentrates on bytecode instrumenting in JVM to fix some … Continue reading →

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

Hack Go – generate non-FIPS DSA key parameters using hacked Go compiler

Posted on October 15, 2014 by daveti

Common DSA key parameter generation follow FIPS 186-3, which requires (L, N) bits length for P and Q, where L is at least 1024 and N is at least 160. However, sometimes we may want non-FIPS (L, N), for example, … Continue reading →

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

byte order – Linux kernel byte order APIs

Posted on August 23, 2014 by daveti

Most of the time, user-space applications do not care about the endian of the running machine, like we call send() and recv() directly expecting the right order of the data and they work! However, things could be changed if you … Continue reading →

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

ksig – sending signals from the kernel space to the user space

Posted on August 23, 2014 by daveti

While syscall kill() gives users the ability to send certain signal to certain process in the user space of Linux, the story is totally different if we want to send signals from the kernel space to the user space. After … Continue reading →

Posted in Dave's Tools, OS, Programming | Tagged , , , | Leave a comment

Book Recommendation – Building Probabilistic Graphical Models with Python

Posted on August 9, 2014 by daveti

“Building Probabilistic Graphical Models with Python” is the 3rd book I have reviewed from PACKT publishing. It has just been released on this June. Compared to the classic book of PGM – “PGM: Principles and Techniques” by Dr. Koller, this … Continue reading →

Posted in AI/ML, Programming | Tagged , , , , | Leave a comment

KT – use kernel timers in the Linux kernel

Posted on July 9, 2014 by daveti

Compared to start a timer directly in certain kernel thread which will make the thread sleep for a while, using a kernel timer may be much more desired without stopping the current working thread. This post demonstrates a live example … Continue reading →

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Python hacking – make ElementTree support line number

Posted on July 4, 2014 by daveti

An easy way to parse XML in Python is using Python xml.etree.ElementTree, which parses the XML document/data into a tree structure, where each node is an Element object. Only within few lines of code, one can extract all the XML … Continue reading →

Posted in Programming | Tagged , , , , | 16 Comments