1. You are doing some fancy, low-level, unorthodox memory operation in your C program.
  2. You segfault.
  3. The most advanced debugging tool that you know (i.e. spamming printf around) is printing a memory address.
  4. You are so dumb that you cannot figure it out where this address is located.
  5. You don’t want to manually look to /proc/PID/maps to find the memory segment.

Here is a Python script for you:


# (C) 2022 Massimo Girondi - CC BY-NC-SA 4.0

import re
import sys
import psutil

# From psutil examples
def pidof(pgname):
    pids = []
    for proc in psutil.process_iter(['name', 'cmdline']):
        # search for matches in the process name and cmdline
        if proc.info['name'] == pgname or \
                proc.info['cmdline'] and proc.info['cmdline'][0] == pgname:
    return pids

if len(sys.argv) < 3:
    printf("Usage: locate_address.py process_name address"

name =sys.argv[1]
pid = int(pidof(name)[0])
address = int(sys.argv[2], 16)

pattern = re.compile("([0-9a-fx]+)-([0-9a-fx]+)(.* )+(.+)$")
with open(f"/proc/{pid}/maps") as f:
    for line in f:
        s = pattern.search(line)
        start = int(f"0x{s.group(1)}",16)
        stop = int(f"0x{s.group(2)}",16)
        n = len(s.groups())
        name =  s.group(n)
        #print(start, stop, name)
        if start <= address  <= stop: