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debugging.md

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10/25/2023

Debugging

Introduction

We can utilize a .txt file for automating the sending of commands to gdb for us.

(e.g.) We can dump the process memory to a specified file:

gdb-commands.txt:

# load process
start

# set bitmask for which memory segments to dump
!sudo echo 0x7 > /proc/$(pgrep aslr1)/coredump_filter

# dump process memory to file process.core
gcore process.core

# no confirm, so we can quit without interaction
set confirm off
quit

NOTE: Be sure to change the following pgrep binary with your specified binary you are targeting.

  • In this case, our target binary is aslr1

Run with gdb:

gdb -q --command=gdb-commands.txt ./aslr1

We then have a memory dump of that process under the file name, process.core in which we can use to further analyze our binary in memory.