chop0

Page edit divison

A Pen by Opher Vishnia on CodePen.

License.

chop0

echo hi

chop0

`@everyone```@everyone ||df||``````````````````````````` a 

chop0

Bee
Cat
Coyote
Duck
Emu
Fly
Kangaroo
Koala
Panther
Platypus

chop0

lemon gallery

this was the first of two challenges in the gunnhacks 7.0 ctf; the bug is a buffer overflow, with aslr, nx, and stack protection disabled.  also it's stripped and the section headers are a bit fucked up >:).  it's statically linked, and does not have libc.

the lemons have revolted in the lemon gallery due to abysmal working conditions and forced labour.  they've put up a blockade which seems almost inpenetrable; i can't even find the libc version! connect with nc shell.ctf.gunnhacks.com 45753.

we can run pwn checksec to get an idea of what security features the binary has: alright.  if we can overflow a buffer, we might be able to jump straight to our shellcode.  let's take a look in gdb (using starti to immediately break when the program starts). ![disassembly](https://chop0.i

chop0

io = start()

zero_rsi = 0x400134
add_rsi = 0x400126
syscall = 0x400123
read = 0x40011c
# shellcode = asm(shellcraft.sh())
# payload = fit({
#     32: 0xdeadbeef,
#     'iaaa': [1, 2, 'Hello', 3]

chop0

function lemonthink() {
   let buf = new ArrayBuffer(4);
   let lemon = new Int32Array(buf);
   let think = new Float32Array(buf);

   lemon[0] = 0x7F800001; // A NaN that's not the normal JS NaN
   think[0] = think[0]; // When interpreted, JS sees the (different to normal) NaN and replaces it with a normal NaN.  Compiled JS doesn't modify the value.
   return lemon[0];
}
console.log(lemonthink()); // 0x7fc00001, 2143289345

chop0

fn steps(mut a: i128, mut b: i128, mut c: i128, mut d: i128) -> u32 {
    let mut i = 0;
    while coeffs != (0, 0, 0, 0) {
        (a, b, c, d) = ((a - b).abs(), (b - c).abs(), (c - d).abs(), (d - a).abs());
        i += 1;
    }
    i
}

fn main() {

chop0

zone/zone-list.h:  // zone-allocated objects for which destructors are not called anyway, so
ast/scopes.cc:    // scope and we terminate the iteration there anyway.
ast/scopes.cc:  // in the outer scope anyway, because if a binding exists in an outer
ast/scopes.h:    // Sloppy eval in script scopes can only introduce global variables anyway,
ast/scopes.h:      //      isn't extendable anyway, or
heap/memory-chunk.cc:    // Not actually used but initialize anyway for predictability.
heap/cppgc/heap-page.cc:  //    for the first header which will anyways serve as header again.
heap/heap.cc:    // This is an optimization. The sweeper will release black fillers anyway.
codegen/x64/assembler-x64.cc:  // (larger) kCodeAlignment anyways.
codegen/ia32/assembler-ia32.cc:  // (larger) kCodeAlignment anyways.

chop0

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "parse.h"

#define BUFSIZE 256

FILE* open_map() {
  FILE* ver = fopen("/proc/version", "r");