LC

Implement a Simple Debugger with ptrace

hard7/8

Analyze a Coredump Post-Mortem Intercept malloc and free with LD_PRELOAD

Language

Compiler

2.0s Limit 256MB

Implementation

Write a C program that implements a simple debugger using ptrace. The parent process attaches to a child, sets a breakpoint, single-steps, and continues.

Requirements:

Fork a child process that calls ptrace(PTRACE_TRACEME)
Parent waits for child stops and reports status
Use PTRACE_PEEKDATA and PTRACE_POKEDATA to manipulate memory
Print actions taken at each step
Output must mention ptrace, breakpoint, and single-step

Why This Matters

GDB, strace, and rr are all built on the exact PTRACE_PEEKDATA/PTRACE_POKEDATA/PTRACE_SINGLESTEP primitives you implement here; the INT3 (0xCC) breakpoint-insertion trick is the same technique every native debugger on Linux uses under the hood. Sandboxing tools and malware analysis harnesses also use ptrace to intercept syscalls made by an untrusted process.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0