Writing shellcode for Linux and *BSD

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Writing shellcode for Linux and *BSD

Author: Daniele Mazzocchio

Last update: Apr 26, 2005

Latest version: Writing shellcode for Linux and *BSD - Table of contents

Table of Contents
1. Introduction...................................................................................................................................... 2
2. Linux system calls............................................................................................................................ 3
2.1 int 0x80...................................................................................................................................... 3
2.2 libc............................................................................................................................................. 4
3. *BSD system calls............................................................................................................................6
4. Writing the shellcode........................................................................................................................7
4.1 In assembler............................................................................................................................... 7
4.2 In C............................................................................................................................................ 9
5. Spawning a shell.............................................................................................................................11
6. Shellcode analysis.......................................................................................................................... 15
6.1 Trust is good............................................................................................................................ 15
6.2 ...but control is better............................................................................................................... 15
7. Appendix........................................................................................................................................ 19
7.1 References................................................................................................................................19
7.2 Bibliography............................................................................................................................ 19

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http://www.shell-storm.org/papers/files/442.pdf