Writing shellcode for Linux and *BSD

Author: Daniele Mazzocchio
Last update: Apr 26, 2006
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Table of contents

• 1. Introduction
• 2. Linux system calls
  • 2.1 int 0x80
  • 2.2 libc
• 3. *BSD system calls
• 4. Writing the shellcode
  • 4.1 In assembler
  • 4.2 In C
• 5. Spawning a shell
• 6. Shellcode analysis
  • 6.1 Trust is good...
  • 6.2 ...but control is better
• 7. Appendix
  • 7.1 References
  • 7.2 Bibliography