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I am Dave Jing Tian, an Assistant Professor in the Department of Computer Science at Purdue University working on system security. My research involves embedded systems, operating systems, and trusted computing. All opinions are my own.
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All blogs on this website are licensed under a Creative Commons Attribution 4.0 International License.
Category Archives: Programming
Retrieve PID from the packet in Unix domain socket – a complete use case for recvmsg()/sendmsg()
The original question was how to retrieve the PID of the packet (sender) in the Unix domain socket. As titled, the answer is recvmsg()/sendmsg(). However, the most useful information I could find online is Michael’s man7.org. People keep talking about … Continue reading
Bash Hacking – bash2, add setting CPU affinity support to the Bash
This post is NOT initially designed for how to hack Bash. But it does tell the truth that hacking Bash is not that hard, by adding a useful feature to Bash itself – setting CPU affinity support. Have fun and … Continue reading
Python Hacking – urlopen timeout issue
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 puuth, Python, socket, SSL, timeout, urllib2, urlopen
4 Comments
Hack Go – generate non-FIPS DSA key parameters using hacked Go compiler
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
byte order – Linux kernel byte order APIs
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
ksig – sending signals from the kernel space to the user space
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
Book Recommendation – Building Probabilistic Graphical Models with Python
“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
Python hacking – make ElementTree support line number
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
crypto – use Linux kernel crypto API
Crypto is an important part of the Linux kernel source code. One can tell from the standalone crypto directory under the kernel source tree. Device drivers, file system and security all need crypto. This post does not help understand the … Continue reading
Posted in OS, Programming, Security
Tagged CentOS, crypto, cryptomgr, kernel, Linux, SHA1
3 Comments