Systems Foundations Complete
The Program Investigation Capstone brought the course’s tools together. Use this short review to find anything you want to revisit; you don’t need another report or another run through the capstone.
The complete execution model
Section titled “The complete execution model”Follow the diagram from the source file to the running program’s requests to Linux.
Each arrow shows a handoff between parts of the system. The compiler toolchain creates an executable. The shell asks Linux to replace a process image with it. Linux, along with the dynamic loader for dynamically linked programs, establishes the mappings. The processor then executes instructions using registers and memory. A user-space instruction can’t open a file on its own, so the program crosses the system-call boundary and gets a return value back from the kernel.
Check what feels familiar
Section titled “Check what feels familiar”Think back to the tasks you just completed. If one of these still feels unclear, use its link to revisit the example. Looking up commands and using hints are fine.
| Can you… | Review if needed |
|---|---|
| Find a file, inspect its permissions, and stop your own background process? | Linux Foundations |
| Follow an input through a program and check a boundary case? | Reading Unfamiliar Code |
| Build a C program and tell a compile error from a link error? | C Programs and Compilation |
| Find the entry point and loadable regions of an executable? | Reading an ELF File |
| Follow a value through registers, memory, a call and a return? | Machine Instructions and Registers |
| Find a file operation in a system-call trace? | Programs Asking Linux for Help |
| Stop at an incorrect value and check a fix against failing and valid inputs? | Debugging Foundations |
You don’t need to repeat work that already makes sense. Pick the one example that would help most if you found a gap.
Where to go next
Section titled “Where to go next”You now have the Linux, programming and debugging foundations for Vulnerability Research. That course uses them to investigate software failures and their security consequences.
Keep your working VM and recovery point, along with any code or notes you want to return to. Continue to use only course-provided or explicitly authorized targets.