My first shellcode :)

/*
 * File: shello.c
 *
 * Generated from this assembly code:
 *      pushl   %ebp
 *      movl    %esp, %ebp
 *      
 *      subl    $12, %esp
 *      movl    $0x6c6c6548, -12(%ebp)
 *      movl    $0x6f57206f, -8(%ebp)
 *      movl    $0x0a646c72, -4(%ebp)
 *      
 *      movl    $4, %eax        
 *      movl    $1, %ebx
 *      leal    -12(%ebp), %ecx 
 *      movl    $12, %edx 
 *      
 *      int     $0x80
 *      addl     $12, %esp
 *      
 *      leave
 *      ret
 * 
 */

/*
 * Tested on Linux hilstdsk 3.2.7-1-ARCH #1 SMP PREEMPT Tue Feb 21
 * 16:59:04 UTC 2012 i686 AMD Athlon(tm) 64 X2 Dual Core Processor
 * 4400+ AuthenticAMD GNU/Linux
 * Archlinux
 */

/*
 * Compile: gcc -o shello shello.c
 * Run: ./shello
 * Output: Hello World
 */
 
/*
 * Thats pretty cool!
 */
#include 

static char shellcode[] = "\x55"
        "\x89\xe5"
        "\x83\xec\x0c"
        "\xc7\x45\xf4\x48\x65\x6c\x6c"
        "\xc7\x45\xf8\x6f\x20\x57\x6f"
        "\xc7\x45\xfc\x72\x6c\x64\x0a"
        "\xb8\x04\x00\x00\x00"
        "\xbb\x01\x00\x00\x00"
        "\x8d\x4d\xf4"
        "\xba\x0c\x00\x00\x00"
        "\xcd\x80"
        "\x83\xc4\x0c"
        "\xc9"
        "\xc3";

int main(void)
{
        void (*p)(void);
        p = shellcode;
        p();
        return 0;
}