iximeow

#include <assert.h>
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>

int main() {
    int fd = open("doesnotexist", O_CREAT);
    assert(fd > 0);
    void* map = mmap(NULL, 65536, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);

iximeow

use std::io::Write;
use std::process::Command;

extern "C" {
    fn mprotect(addr: *const u8, len: usize, prot: u32) -> u32;
}

fn main() {
    let mut args = std::env::args();
    let _ = args.next();

iximeow

0x00000000: 48895c2408        : mov qword [rsp + 0x8], rbx 
0x00000005: 48896c2410        : mov qword [rsp + 0x10], rbp 
0x0000000a: 4889742418        : mov qword [rsp + 0x18], rsi 
0x0000000f: 57                : push rdi 
0x00000010: 4154              : push r12 
0x00000012: 4155              : push r13 
0x00000014: 4883ec20          : sub rsp, 0x20
0x00000018: 4885c9            : test rcx, rcx 
0x0000001b: 0f844b040c00      : jz 0xc044b
0x00000021: f6410602          : test byte [rcx + 0x6], 0x2 

iximeow

#! /bin/bash

asn1=$(echo -e "\x30\x13\x02\x01\x05\x16\x0e\x41\x6e\x79\x62\x6f\x64\x79\x20\x74\x68\x65\x72\x65\x3f")
#asn2=$(echo -e "\x00\x01\x02\x03")
asn2=""
offset=0

# while [ $offset -lt ${#asn1} ]; do
#  curr=${asn1:offset:1}
#  printf "$offset: %02x\n" \'$curr

iximeow

/*
 * if you need more memory, add some to your program with this cool trick
 */

#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/mman.h>

iximeow

trait Person {
    fn greeting(&self) -> StateOfMind;
    fn name(&self) -> &'static str;
}

struct Ixi { }
struct Katie { }

#[derive(Debug)]
enum StateOfMind {

iximeow

#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/ucontext.h>

#include <stdint.h>

void interpret(char op) {
    printf("interpreting %02x\n", op);
}

iximeow

trait Person {
    fn greeting(&self) -> StateOfMind;
    fn name(&self) -> &'static str;
}

struct Ixi { }
struct Katie { }

#[derive(Debug)]
enum StateOfMind {

iximeow

; build and run: `nasm segment_heccery.asm -f bin -o img.bin && qemu-system-x86_64 img.bin -s -S`

[BITS 16]
[ORG 7c00h]

init:
  cli
  lgdt [gdtr]
  mov eax, cr0
  or al, 1

iximeow

; assemble like `nasm bootloader.asm` (will produce a flat binary output by default)
; run like `qemu-system-x86_64 bootloader`
[BITS 16]
[ORG 7c00h]

init:
  mov cx, 0xB800
  mov gs, cx
  call clr_vga
  mov si, HELLO