README.md

smallest.c is the smallest compilable c code

small.c is the smallest compilable c code that runs

SegFault.c is the smallest c code that produces a segmentation fault

smallest.s compile using nasm on linux to create the smallest Windows exe

SegFault.c

main(){puts();}

small.c

main(){}

smallest.c

main;

smallest.s

IMAGEBASE equ 400000h
BITS 32
ORG IMAGEBASE
  dw "MZ"
  dw 0
  dw 'PE',0
  dw 0x14c
  dw 0
user32.dll:
  dd 'user'
  db '32',0,0
  dd 0
  dw 0
  dw 2
  dw 0x10B
kernel32.dll:
  db 'k'
  db 'e'
  dd 'rnel'
  db '32',0,0
  dd 0
  dd Start - IMAGEBASE
  dd 0
  dd 0
  dd IMAGEBASE
  dd 4
  dd 4
  dw 0
  dw 0
  dw 0
  dw 0
  dw 4
  dw 0
  dd 0
  dd 0x40
  dd 0
  dd 0
  dw 2
  dw 0
  dd 0
  dd 0
  dd 0
  dd 0
  dd 0
  dd 2
  dd 0
  dd 0
  dd IMAGE_IMPORT_DESCRIPTOR - IMAGEBASE
Start:
  push 0
  push world
  push hello
  push 0
  call [MessageBoxA]
  push 0
  call [ExitProcess]
kernel32.dll_iat:
ExitProcess:
  dd impnameExitProcess - IMAGEBASE
  dd 0
kernel32.dll_hintnames:
  dd impnameExitProcess - IMAGEBASE
  dw 0
impnameExitProcess:
  dw 0
  db 'ExitProcess'
impnameMessageBoxA:
  dw 0
  db 'MessageBoxA', 0
user32.dll_iat:
MessageBoxA:
  dd impnameMessageBoxA - IMAGEBASE
  dd 0
user32.dll_hintnames:
  dd impnameMessageBoxA - IMAGEBASE
  dd 0
IMAGE_IMPORT_DESCRIPTOR:
  dd kernel32.dll_hintnames - IMAGEBASE
world:
  db 'worl'
  db 'd!',0,0
  dd kernel32.dll - IMAGEBASE
  dd kernel32.dll_iat - IMAGEBASE
  dd user32.dll_hintnames - IMAGEBASE
hello:
  db 'Hell'
  db 'o',0,0,0
  dd user32.dll - IMAGEBASE
  dd user32.dll_iat - IMAGEBASE
times 7 db 0