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System Calls & Kernel Interface — Operating Systems — LowLevelCraft

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Operating Systems
System Calls & Kernel Interface

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System Calls & Kernel Interface

The boundary between user space and kernel space. Learn raw syscalls, ptrace for tracing, system call interception, and kernel entry points.

~360 Minutes 8 Challenges

how system calls work tutorial

About this subtrack

System Calls explodes the user/kernel boundary: raw syscalls, ptrace, and sandbox ideas.

Tasks (8)

Write Hello World Using Only Raw syscall() Instructions

Implement User-Space System Call Interceptor Using ptrace

Implement Custom System Call in Linux Kernel

Trace System Calls Using strace

Understand Syscall ABI: Registers, Numbers, Kernel Entry

Add Sandbox Using seccomp-bpf to Whitelist Allowed Syscalls

Understand Privilege Levels: Ring 0 vs Ring 3

Implement System Call Fuzzer: Send Invalid Arguments