In this third post in the series about the programming experiment to use the x86 trap flag and trap signal handler to observe the execution of a program, we’ll actually try to observe something useful: we’ll print every system call we encounter, just like the popular Linux tool …
read moreThis post continues the exploration of using the x86 trap flag and signal handlers to observe the execution of a program; this time with the goal of injecting the ‘debugger’ into a compiled binary. This includes an overview of LD_PRELOAD.
In my last post I introduced the idea of observing …
read moreThis post explores the use of Linux’ ptrace functionality to step through a complete program execution instruction by instruction, and compares it to a much faster hack involving setting the x86 trap-flag and signal-handlers, which allows observing the execution of a program from within that program.
For some x86 assembler …
read moreThis post was moved from a now defunct blog of mine (on 2017-01-04)
When I published my recent visualization of populations near Montreal train stations, some people told me that I should consider extending it with data showing work places as well. This makes sense as a way to gauge …
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