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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Category Archives: Security
Syzkaller  starts to support USB fuzzing recently and has already found over 80 bugs within the Linux kernel . Almost every fuzzing expert whom I talked to has started to apply their fuzzing techniques to USB because of the … Continue reading
One of the exciting things Intel has brought to RSA 2019 is Intel SGX Card . Yet there is not much information about this coming hardware. This post collects some related documentation from Intel and speculates what could happen within … Continue reading
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
Valgrind has a client request mechanism, which allows a client to pass some information back to valgrind. This includes asks valgrind to do a logging in its own environment, tells valgrind a range of VA being used as a new … Continue reading
Intel SGX has been there in the market for while. Yet there are still a lot of misundrestandings and mysteries about this technology. This post provides an introduction to Intel SGX OwnerEpoch and Sealing, discusses their security impacts, and speculates … Continue reading
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
This post follows the “Multics Simulator Instructions” (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
SGX sealing is vulnerable to rollback attacks as the enclave is not able to tell if the sealed data is the latest or a old copy. To mitigate this attack, monotonic counter (MC) has been introduced in Intel SGX SDK … Continue reading
The naive way of using the Actor model in Elixir is using “receive” in a loop, which is then “spawn”d as a Erlang process. Unfortunately, a potential DoS attack could happen if the pattern matching is not coded carefully with … Continue reading
kcov is a kernel feature used to support syzkaller. To provide the code coverage information from the kernel itself, the GCC compiler was patched to instrument the kernel image. The kernel itself was also patched to enable this feature where … Continue reading