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I am Dave (Jing) Tian, an Associate Professor in the Department of Computer Science at Purdue University working on system security. My research involves embedded systems, operating systems, trusted and confidential computing, and hardware security. All opinions are my own.
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Author Archives: daveti
Linux kernel I/O Stack Diagram
Found this figure online. The title of this diagram may be biased as it is not the complete I/O stack but a concentration on block devices with a focus on SCSI layer. Some important missing stuffs, in my opinion, include … Continue reading
Trustworthy Whole-System Provenance for the Linux Kernel
Our paper “Trustworthy Whole-System Provenance for the Linux Kernel” has been accepted by USENIX Security 2015. While details could be found in the paper (link below), I would like to talk about some background about LPM (a.k.a., Linux Provenance Module, … Continue reading
Python Levenshtein distance – Choose Python package wisely
Brad and I were working on some text similarity computation. One of the most popular string distance functions is the Levenshtein distance, which is also called the edit distance. We use Python for its brevity and widely-library support (OK, I … Continue reading
More Guidelines Than Rules: CSRF Vulnerabilities from Noncompliant OAuth 2.0 Implementations
Our paper, as titled, has been accepted by DIMVA 2015 – Milano, Italy. While the final paper will not be released until July, we will have a brief summary of what we have done in this post. Another focus here … Continue reading
Human Learning – some thoughts about Machine Learning and its applications
I have attended a security conference recently. To my surprise, a great portion of accepted papers use some kind of Machine Learning techniques to achieve certain security targets. While I am NOT going to criticize any of the papers, this … Continue reading
arpsec – Securing ARP from the Ground Up
Our paper “Securing ARP from the Ground Up” has been accepted as a short paper by CODASPY15, which will be in San Antonio, TX from March 2nd to 4th. In this post, we will talk about our solution to ARP … Continue reading
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
Kernel Hacking – use crypto API in the IRQ context
After my first post about Linux kernel crypto API, I keep playing with kernel crypto API for DSA and RSA implementations (will talk about these in my future posts). The truth is crypto API is NOT designed for IRQ context. … Continue reading
Fedora 21 Workstation – some post installation issues after fedup from 20
Believe or not, Fedora’s release upgrade is always troublesome, partially because of the package management imposed, which is initially designed to ease the update for binaries. After the painful experience from Fedora 19 to 20, I have just gone thru … Continue reading
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