-
-
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, trusted and confidential computing, and hardware security and trust. All opinions are my own.
Shoot me:
root@davejingtian.org Categories
Resource
Tags
- ABNF
- agile
- AI/ML
- Alcatel-Lucent
- android
- arp
- asn1c
- assembly
- bash
- ber
- bison
- BNF
- build
- C
- CentOS
- CIS122
- Coverity
- crypto
- csv
- cuda
- DCA
- ddclient
- debugfs
- DH
- Diffie-Hellman
- drd
- drig
- elixir
- fedora
- fedup
- flex
- fsck
- gcc
- gdb
- GFW
- git
- github
- gnome
- gprof
- gpu
- guitar
- gumstix
- helgrind
- intel
- itevad
- Java
- jmgsim
- JVM
- kenai
- kernel
- kill
- ksh
- kvm
- ld
- Linux
- list
- netbeans
- netlink
- nvidia
- OS
- overo
- Python
- relay
- security
- selinux
- sgx
- socket
- ssh
- Ubuntu
- UO
- USB
- valgrind
- x86
- x86_64
- yocto
Blog Stats
- 236,447 hits
-
All blogs on this website are licensed under a Creative Commons Attribution 4.0 International License. -
-
-
Author Archives: daveti
Hacking Valgrind
This post talks about 3 commits I have recently added into my own valgrind tree [1], including the support for fsgsbase instructions, rdrand/rdseed instructions, and adding a new trapdoor (client request) to support gdb-like add-symbol-file command. Note that all these … Continue reading
Posted in Dave's Tools, Programming
Tagged add-symbol-file, cpuid, fortanix, fsgsbase, gdb, rdrand, rdseed, trapdoor, valgrind, x86_64
Leave a comment
Valgrind trapdoor and fun
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
Some notes on SGX OwnerEpoch and Sealing
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
Kernel Code Execution Time Measurement (kcetm)
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
Rowhammer Pine64
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
Posted in Linux Distro, OS, Security
Tagged ARMv8, cache, clflush, fedora, pine64, rowhammer
Leave a comment
“make deb-pkg” broken
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
Running Multics on Linux (Fedora 27)
This post follows the “Multics Simulator Instructions”[1] (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
Some notes on the Monotonic Counter in Intel SGX and ME
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
davejingtian.org 