shinh

import ast
import inspect
import os
import sys


def my_lambda_source(l):
    s = inspect.getsource(l)
    if s.count('lambda') == 2:
        return None

shinh

$ python3 ./scripts/elichikacheck.py mutable.py

すると out/elichika_tmp/tmp_mutable/model.onnx と out/elichika_tmp/tmp_immutable/model.onnx が出ます

$ pip3 install --user netron
$ netron out/elichika_tmp/tmp_mutable/model.onnx

shinh

import u


print(u.U().foo())

shinh

import java.io.*;
import java.util.*;
import javax.servlet.ServletInputStream;

import com.trendmicro.CustomOIS;
import com.trendmicro.Person;
import com.trendmicro.jail.Flag;

import org.apache.commons.collections.Factory;
import org.apache.commons.collections.Transformer;

shinh

#!/usr/bin/env ruby
#
# DEF CON CTF 2018 doublethink
#
# A polyglot of 9 architectures amd64, mix, pdp-8, pdp-1, pdp-10,
# nova, lgp-30, clemency, and mmix. MMIX was added after the CTF.
#
# This will generate a file named "payload" and you can try it by
#
# $ ./scripts/service.py < payload

shinh

#!/usr/bin/ruby

# 65 of https://speakerdeck.com/k0kubun/the-method-jit-compiler

[1, 5, 10, 15, 20, 30, 50, 100].each do |n|
  rb = "/tmp/loop_#{n}"
  File.open(rb, "w") do |of|
    n.times{|i|of.puts "def call#{i}() nil end"}
    n.times{|i|of.puts ["call#{i}"] * 5 * '; '}

shinh

# https://github.com/tric/trick2018/blob/master/honorable-mentions/eregon/entry.rb
#
# Just replacing eval by print should yield:

i,s,S=ARGF.read,[],/"(?:\\["\\\/bfnrtu]|[^"\\])*"/
while i[S]
  s << $` << $&
    i=$'
end
s << i

shinh

Encoding.default_external = 'binary'
Encoding.default_internal = 'binary'
c = File.open('pieces/broken', 'r:binary').read
p c[0x5b0-3...0x8d4].size

frags = (1..8).map{|i|File.read("pieces/fragment_#{i}.dat")}
p frags.map{|f|f.size}.inject(:+)

[*0..7].permutation.each do |a|
  ff = ''

shinh

(gdb) start
Temporary breakpoint 1 at 0x9ef: file mangled_syms.c, line 22.
Starting program: /home/i/test/a.out

Temporary breakpoint 1, main () at mangled_syms.c:22
22      int main() {
(gdb) n
23        unsigned long* at_random = (unsigned long*)getauxval(AT_RANDOM);
(gdb)
24        unsigned long rnd = at_random[1];

shinh

// https://twitter.com/herumi/status/983496460753821696

int calc_mine(int a, int b, int s) {
  return a >> (32 - __builtin_clz(a ^ b));
  // return (a & b) >> (32 - __builtin_clz(a ^ b));
}

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