Generate super small but valid ELF executable file from C source code.
It merges all sections (.text, .data, .rodata) in one, then copies it out, and finally adds ELF Header and Program Headers manually to generate a statically-linked file.
I hope this project is helpful for writing shellcode by C, or for kernel pwn exploit writing.
The project is firstly used at here.
Add xxx.c file here, include tinylib.h, modify Makefile, then make.
It will generate three files for each .c file:
- *.elf: raw ELF created by gcc
- *.textbin: pure shellcode
- *.out: the tiny elf file
(Need gcc 8 or later to support -static-pie option)
Refer to this LWN article: Nolibc: a minimal C-library replacement shipped with the kernel
It is a very interesting project, and it has appeared in Linux Kernel mainline since 5.1 !
see tools/include/nolibc
This may be a better replacement of tinylib.h in this project.