Shellcode starter kit

Develop and test shellcodes locally.

Contains

• The source code for a tester program, to load the shellcode in memory and execute it;
• A basic shellcode example to:
  • open the flag file,
  • Use sendfile to send data from the flag file file descriptor to the standard output, effectively printing the flag,
  • exit gracefully;
• An example flag file for the kit to work out of the box.

How to use

# compile the tester
gcc -o tester tester.c

# compile and extract the shellcode
as shellcode.s -o shellcode.o
objcopy --dump-section .text=shellcode shellcode.o

# run the shellcode using the tester
cat shellcode | ./tester

Acknowledgements

This repo is just a formatting of the snippets provided by @zardus during the Computer Systems Security (CSE466) class at ASU.